diff --git a/alembic/versions/invite_fingerprint_table.py b/alembic/versions/invite_fingerprint_table.py
new file mode 100644
index 0000000..5604d07
--- /dev/null
+++ b/alembic/versions/invite_fingerprint_table.py
@@ -0,0 +1,50 @@
+"""invite_fingerprint table (任务 3 指纹归因兜底)
+
+Revision ID: invite_fingerprint_table
+Revises: 0cf18d590b1d
+Create Date: 2026-06-08 14:00:00.000000
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = 'invite_fingerprint_table'
+down_revision: Union[str, Sequence[str], None] = '0cf18d590b1d'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # 邀请指纹归因表:落地页访问时记一行,登录后剪贴板没拿到邀请码时反查
+    op.create_table(
+        'invite_fingerprint',
+        sa.Column('id', sa.Integer(), autoincrement=True, nullable=False),
+        sa.Column('inviter_user_id', sa.Integer(), nullable=False),
+        sa.Column('ip', sa.String(length=64), nullable=False),
+        sa.Column('device_model', sa.String(length=64), nullable=False, server_default=''),
+        sa.Column('screen', sa.String(length=32), nullable=False, server_default=''),
+        sa.Column('user_agent', sa.Text(), nullable=False, server_default=''),
+        sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=False),
+        sa.ForeignKeyConstraint(['inviter_user_id'], ['user.id']),
+        sa.PrimaryKeyConstraint('id'),
+    )
+    # 反查主索引:(ip, screen, device_model, created_at)
+    # /bind 兜底分支 WHERE ip=? AND screen=? AND device_model=? AND created_at > now - 7d
+    # ORDER BY created_at DESC LIMIT 1 — SQLite/PG 优化器都能反向扫该索引
+    op.create_index(
+        'ix_invite_fp_match',
+        'invite_fingerprint',
+        ['ip', 'screen', 'device_model', 'created_at'],
+    )
+    # 兜底/统计索引:按 inviter 看"这个邀请人的落地页被谁访问过"
+    op.create_index('ix_invite_fp_inviter', 'invite_fingerprint', ['inviter_user_id'])
+
+
+def downgrade() -> None:
+    op.drop_index('ix_invite_fp_inviter', table_name='invite_fingerprint')
+    op.drop_index('ix_invite_fp_match', table_name='invite_fingerprint')
+    op.drop_table('invite_fingerprint')
diff --git a/app/api/v1/invite.py b/app/api/v1/invite.py
index 2bbb857..c5de448 100644
--- a/app/api/v1/invite.py
+++ b/app/api/v1/invite.py
@@ -1,25 +1,37 @@
 """好友邀请 endpoint。
 
-路由前缀 /api/v1/invite,需 Bearer 鉴权(用户级数据):
-  GET  /me     我的邀请码 + 分享链接 + 已邀人数/已得金币(邀请页展示)
-  POST /bind   把当前登录用户(被邀请人)绑定到某邀请码,注册即生效,双方各发金币
+路由前缀 /api/v1/invite,需 Bearer 鉴权(用户级数据);唯一例外是 /landing-track
+(落地页 dl.html 浏览器访问、无 token,详见任务 3 [[invite-three-tasks]]):
+  GET  /me                我的邀请码 + 分享链接 + 已邀人数/已得金币(邀请页展示)
+  POST /bind              把当前登录用户(被邀请人)绑定到某邀请码;支持三种归因:
+                          ① clipboard:首启读剪贴板拿邀请码 → 上报码
+                          ② manual:用户在邀请页输入邀请码 → 上报码
+                          ③ fingerprint:剪贴板没拿到时上报指纹,后端反查
+  POST /landing-track     落地页 dl.html 访问时上报指纹(剪贴板兜底的服务端一端,无需鉴权)
 
-客户端两种调用 /bind:
-  - 自动:首启读剪贴板拿到邀请码 → 登录后调本接口(channel=clipboard)
-  - 手动:用户在邀请页输入好友邀请码(channel=manual)
-
-绑定的真正逻辑(邀请码生成/反查、幂等、自邀屏蔽、发金币)在 repositories/invite.py。
+绑定的真正逻辑(邀请码生成/反查、幂等、自邀屏蔽、发金币、指纹反查)在
+repositories/invite.py。
 """
 from __future__ import annotations
 
 import logging
+import re
 
-from fastapi import APIRouter
+from fastapi import APIRouter, Request
 
 from app.api.deps import CurrentUser, DbSession
+from app.core import rewards
 from app.core.config import settings
 from app.repositories import invite as invite_repo
-from app.schemas.invite import BindInviteIn, BindInviteOut, InviteInfoOut
+from app.schemas.invite import (
+    BindInviteIn,
+    BindInviteOut,
+    InviteeItem,
+    InviteeListOut,
+    InviteInfoOut,
+    LandingTrackIn,
+    LandingTrackOut,
+)
 
 logger = logging.getLogger("shagua.invite")
 
@@ -31,9 +43,43 @@ _BIND_MESSAGES = {
     "invalid_code": "邀请码无效",
     "self_invite": "不能填写自己的邀请码",
     "not_eligible": "邀请仅对新注册用户生效",
+    "fp_not_found": "未匹配到邀请关系",
 }
 
 
+def _client_ip(request: Request) -> str:
+    """从 HTTP 头拿真实 IP。nginx 反代时走 X-Forwarded-For;裸跑 uvicorn 走 request.client。"""
+    xff = request.headers.get("x-forwarded-for", "")
+    if xff:
+        # X-Forwarded-For 可能是 "client, proxy1, proxy2" 链;取第一个 = 真实客户端
+        return xff.split(",")[0].strip()
+    return request.client.host if request.client else ""
+
+
+# Android UA 形如 '... ; <Model> Build/<id>) AppleWebKit/...';抓 ';' 后到 ' Build/' 前
+# 的 token = Build.MODEL(跨端跟客户端 android.os.Build.MODEL 对齐)。user-agents 库
+# 把 Android 设备归为 'Smartphone' 通用名,抓不到真实型号,只能正则。
+_ANDROID_BUILD_MODEL_RE = re.compile(r";\s*([^;]+?)\s+Build/", re.IGNORECASE)
+
+
+def _parse_device_model(ua: str) -> str:
+    """解析浏览器 UA 拿手机型号(如 '24115RA8EC'、'PJF110')。
+
+    Android:正则抓 UA 里 ';...Build/' 前的 token(== Build.MODEL),跨端可严格匹配。
+    iOS / 解析不到:退到 user-agents 库的通用解析,失败/UA 空 → 返空字符串。
+    """
+    if not ua:
+        return ""
+    m = _ANDROID_BUILD_MODEL_RE.search(ua)
+    if m:
+        return m.group(1).strip()
+    try:
+        from user_agents import parse
+        return (parse(ua).device.model or "").strip()
+    except Exception:  # noqa: BLE001
+        return ""
+
+
 @router.get("/me", response_model=InviteInfoOut, summary="我的邀请码 + 分享链接 + 战绩")
 def my_invite(user: CurrentUser, db: DbSession) -> InviteInfoOut:
     code = invite_repo.ensure_code(db, user)
@@ -48,17 +94,124 @@ def my_invite(user: CurrentUser, db: DbSession) -> InviteInfoOut:
     )
 
 
-@router.post("/bind", response_model=BindInviteOut, summary="绑定邀请人(注册即生效,双方发金币)")
-def bind_invite(req: BindInviteIn, user: CurrentUser, db: DbSession) -> BindInviteOut:
-    result = invite_repo.bind(
-        db, invitee=user, invite_code=req.invite_code, channel=req.channel,
+@router.get("/invitees", response_model=InviteeListOut, summary="我邀请的人列表(分页)")
+def my_invitees(
+    user: CurrentUser, db: DbSession, limit: int = 20, offset: int = 0
+) -> InviteeListOut:
+    """邀请页小窗(取前几条) + 完整列表页(分页加载)共用。
+
+    名字/头像的降级兜底在 repositories/invite.get_invitees 算好,这里只组装响应。
+    limit 夹到 [1,50] 防滥用;offset 不小于 0。
+    """
+    limit = max(1, min(limit, 50))
+    offset = max(0, offset)
+    items, total, has_more = invite_repo.get_invitees(
+        db, user.id, limit=limit, offset=offset,
+    )
+    return InviteeListOut(
+        items=[InviteeItem(**it) for it in items],
+        total=total,
+        has_more=has_more,
+    )
+
+
+@router.post(
+    "/landing-track",
+    response_model=LandingTrackOut,
+    summary="落地页指纹采集(无需鉴权)",
+)
+def landing_track(
+    req: LandingTrackIn, request: Request, db: DbSession
+) -> LandingTrackOut:
+    """B 浏览器打开 dl.html?ref=xxx 时上报指纹。
+
+    服务端从 HTTP 头拿 IP/UA、解析 UA 拿 device_model,跟 req.screen 一起入库。
+    无需鉴权(浏览器没 token)。invalid_code / no_ip 走 silent 返回(不抛 5xx 影响下载流程)。
+    """
+    inviter = invite_repo.resolve_inviter(db, req.ref)
+    if inviter is None or inviter.status != "active":
+        return LandingTrackOut(status="invalid_code")
+
+    ip = _client_ip(request)
+    if not ip:
+        return LandingTrackOut(status="no_ip")
+
+    ua_str = request.headers.get("user-agent", "")
+    device_model = _parse_device_model(ua_str)
+
+    invite_repo.record_fingerprint(
+        db,
+        inviter_user_id=inviter.id,
+        ip=ip,
+        screen=req.screen,
+        device_model=device_model,
+        user_agent=ua_str,
     )
     logger.info(
-        "invite bind invitee=%d code=%s channel=%s -> %s",
-        user.id, req.invite_code, req.channel, result.status,
+        "invite landing-track inviter=%d ip=%s screen=%s model=%s",
+        inviter.id, ip, req.screen, device_model,
     )
+    return LandingTrackOut(status="ok")
+
+
+@router.post("/bind", response_model=BindInviteOut, summary="绑定邀请人(注册即生效,双方发金币)")
+def bind_invite(
+    req: BindInviteIn, user: CurrentUser, db: DbSession, request: Request
+) -> BindInviteOut:
+    code = (req.invite_code or "").strip()
+
+    # 路径 1:有邀请码 → 走原路径(clipboard / manual)
+    if code:
+        result = invite_repo.bind(
+            db, invitee=user, invite_code=code, channel=req.channel,
+        )
+        logger.info(
+            "invite bind invitee=%d code=%s channel=%s -> %s",
+            user.id, code, req.channel, result.status,
+        )
+        return BindInviteOut(
+            status=result.status,
+            coins_awarded=result.invitee_coin,
+            message=_BIND_MESSAGES.get(result.status, result.status),
+        )
+
+    # 路径 2:无邀请码 + 有指纹 → 指纹兜底反查
+    if req.fingerprint is not None:
+        ip = _client_ip(request)
+        inviter = invite_repo.resolve_inviter_by_fingerprint(
+            db,
+            ip=ip,
+            screen=req.fingerprint.screen,
+            device_model=req.fingerprint.device_model,
+            window_days=rewards.INVITE_FP_WINDOW_DAYS,
+        )
+        if inviter is None:
+            logger.info(
+                "invite bind invitee=%d fingerprint not_found ip=%s screen=%s model=%s",
+                user.id, ip, req.fingerprint.screen, req.fingerprint.device_model,
+            )
+            return BindInviteOut(
+                status="fp_not_found",
+                coins_awarded=0,
+                message=_BIND_MESSAGES["fp_not_found"],
+            )
+        # 用反查到的 inviter.invite_code 走原 bind 流程(走原幂等/自邀/新人闸/发币逻辑)
+        result = invite_repo.bind(
+            db, invitee=user, invite_code=inviter.invite_code, channel="fingerprint",
+        )
+        logger.info(
+            "invite bind invitee=%d fingerprint -> inviter=%d code=%s -> %s",
+            user.id, inviter.id, inviter.invite_code, result.status,
+        )
+        return BindInviteOut(
+            status=result.status,
+            coins_awarded=result.invitee_coin,
+            message=_BIND_MESSAGES.get(result.status, result.status),
+        )
+
+    # 路径 3:啥都没传 → 无效请求
     return BindInviteOut(
-        status=result.status,
-        coins_awarded=result.invitee_coin,
-        message=_BIND_MESSAGES.get(result.status, result.status),
+        status="invalid_code",
+        coins_awarded=0,
+        message=_BIND_MESSAGES["invalid_code"],
     )
diff --git a/app/core/rewards.py b/app/core/rewards.py
index 38a7059..66449e7 100644
--- a/app/core/rewards.py
+++ b/app/core/rewards.py
@@ -85,6 +85,11 @@ INVITE_INVITEE_COINS: int = 10000
 # 自动绑(剪贴板)在首次注册登录后几秒内发生;留 72h 给手动填码兜底。
 INVITE_NEW_USER_WINDOW_HOURS: int = 72
 
+# 指纹归因兜底(剪贴板被覆盖时):落地页 POST /landing-track 存的指纹记录,在此窗口内可被
+# /bind 反查撞库。窗口取舍:太短(24h)覆盖不到"晚上看链接、第二天装"的常见场景;太宽
+# (30d)IP/设备会漂、匹配错率上升。7 天兼顾"看广告→使用"周期与匹配精度。
+INVITE_FP_WINDOW_DAYS: int = 7
+
 
 # ===== 看激励视频 / 信息流广告发金币 =====
 # 金币数值体系约定:eCPM 单位按"元/千次展示"处理,单次收入 = eCPM / 1000 元。
diff --git a/app/models/__init__.py b/app/models/__init__.py
index 15f195f..428fa03 100644
--- a/app/models/__init__.py
+++ b/app/models/__init__.py
@@ -13,6 +13,7 @@ from app.models.coupon_state import (  # noqa: F401
 )
 from app.models.feedback import Feedback  # noqa: F401
 from app.models.invite import InviteRelation  # noqa: F401
+from app.models.invite_fingerprint import InviteFingerprint  # noqa: F401
 from app.models.meituan_coupon import MeituanCoupon  # noqa: F401
 from app.models.ops_marquee_seed import OpsMarqueeSeed  # noqa: F401
 from app.models.ops_stat_config import OpsStatConfig  # noqa: F401
diff --git a/app/models/invite_fingerprint.py b/app/models/invite_fingerprint.py
new file mode 100644
index 0000000..1c7c342
--- /dev/null
+++ b/app/models/invite_fingerprint.py
@@ -0,0 +1,46 @@
+"""邀请指纹归因表(剪贴板归因兜底)。
+
+数据流(对应 [[invite-three-tasks]] 任务 3):
+  1. B 浏览器打开落地页 dl.html?ref=邀请码 → JS POST /api/v1/invite/landing-track
+  2. 后端从 HTTP 头拿 IP/UA,解析 UA 得 device_model,跟 JS 上报的 screen 一起入库
+  3. B 装包首启 → 登录后,若剪贴板没拿到邀请码(被覆盖),客户端再算一次 screen+Build.MODEL
+     上报 → 后端用 (ip, screen, device_model) 反查本表 7 天内最近匹配 → 拿出 inviter_user_id
+     → 走原 bind 路径(channel=fingerprint)
+
+不要索引(IP, created_at) 单独,组合索引 (ip, screen, device_model, created_at desc) 反查更省。
+"""
+from __future__ import annotations
+
+from datetime import datetime
+
+from sqlalchemy import DateTime, ForeignKey, Integer, String, Text, func
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.db.base import Base
+
+
+class InviteFingerprint(Base):
+    __tablename__ = "invite_fingerprint"
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
+    inviter_user_id: Mapped[int] = mapped_column(
+        Integer, ForeignKey("user.id"), index=True, nullable=False
+    )
+    # 落地页访问者 IP(服务端从 HTTP 头拿,X-Forwarded-For 由部署侧 nginx 透传)
+    ip: Mapped[str] = mapped_column(String(64), nullable=False)
+    # 客户端 Build.MODEL / 浏览器 UA 解析出来的型号(如 "PJF110"、"23046PNC9C")
+    device_model: Mapped[str] = mapped_column(String(64), nullable=False, default="")
+    # 屏幕分辨率 "1080x2400"(浏览器 screen.width × height,客户端 DisplayMetrics)
+    screen: Mapped[str] = mapped_column(String(32), nullable=False, default="")
+    # 完整 UA 字符串(留 debug / 排查"匹配不上"用,不直接参与匹配)
+    user_agent: Mapped[str] = mapped_column(Text, nullable=False, default="")
+
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), server_default=func.now(), index=True, nullable=False
+    )
+
+    def __repr__(self) -> str:  # pragma: no cover
+        return (
+            f"<InviteFingerprint inviter={self.inviter_user_id} "
+            f"ip={self.ip} model={self.device_model} screen={self.screen}>"
+        )
diff --git a/app/repositories/invite.py b/app/repositories/invite.py
index 8d496dd..ca36e31 100644
--- a/app/repositories/invite.py
+++ b/app/repositories/invite.py
@@ -21,6 +21,7 @@ from sqlalchemy.orm import Session
 
 from app.core import rewards
 from app.models.invite import InviteRelation
+from app.models.invite_fingerprint import InviteFingerprint
 from app.models.user import User
 from app.repositories import wallet as crud_wallet
 
@@ -164,3 +165,121 @@ def get_stats(db: Session, inviter_id: int) -> tuple[int, int]:
         .where(InviteRelation.inviter_user_id == inviter_id)
     ).scalar_one()
     return int(count), int(coins)
+
+
+def _mask_phone(phone: str) -> str:
+    """手机号脱敏:138****8888。前端拿不到完整号,展示被邀请人时在此兜底名字。
+
+    11 位标准手机号 → 前 3 + **** + 后 4;非标准(异常/截断)→ 只露后 4 位;太短 → "新用户"。
+    """
+    p = (phone or "").strip()
+    if len(p) == 11:
+        return f"{p[:3]}****{p[-4:]}"
+    if len(p) >= 4:
+        return f"****{p[-4:]}"
+    return "新用户"
+
+
+def get_invitees(
+    db: Session, inviter_id: int, *, limit: int = 20, offset: int = 0
+) -> tuple[list[dict], int, bool]:
+    """查某邀请人的被邀请人列表(按邀请时间倒序, 分页),返回 (items, total, has_more)。
+
+    每条 item = {display_name, avatar_url, coins, invited_at}。降级兜底:
+      名字 = 昵称 → 微信昵称 → 脱敏手机号(很多被邀请人是刚注册新用户、没设资料);
+      头像 = 用户头像 → 微信头像 → None(前端画默认色块)。
+    邀请关系表 join 用户表;total 单独 count(分页时算 has_more)。
+    """
+    total = db.execute(
+        select(func.count())
+        .select_from(InviteRelation)
+        .where(InviteRelation.inviter_user_id == inviter_id)
+    ).scalar_one()
+
+    rows = db.execute(
+        select(InviteRelation, User)
+        .join(User, User.id == InviteRelation.invitee_user_id)
+        .where(InviteRelation.inviter_user_id == inviter_id)
+        .order_by(InviteRelation.created_at.desc())
+        .limit(limit)
+        .offset(offset)
+    ).all()
+
+    items: list[dict] = []
+    for rel, u in rows:
+        items.append({
+            "display_name": u.nickname or u.wechat_nickname or _mask_phone(u.phone),
+            "avatar_url": u.avatar_url or u.wechat_avatar_url or None,
+            "coins": rel.inviter_coin,
+            "invited_at": rel.created_at,
+        })
+    has_more = offset + len(rows) < int(total)
+    return items, int(total), has_more
+
+
+# ===== 指纹归因(剪贴板兜底,见 [[invite-three-tasks]] 任务 3)=====
+
+def record_fingerprint(
+    db: Session,
+    *,
+    inviter_user_id: int,
+    ip: str,
+    screen: str,
+    device_model: str,
+    user_agent: str,
+) -> InviteFingerprint:
+    """落地页 dl.html 访问时调用,写一行指纹记录。
+
+    后续被邀请人登录、剪贴板没拿到邀请码时,/bind 会按 (ip, screen, device_model) 反查本表
+    7 天内最近一条匹配 → 拿出 inviter_user_id 撞库。
+
+    本函数会 commit;调用方(/landing-track endpoint)在此之前无其它写操作。
+    """
+    fp = InviteFingerprint(
+        inviter_user_id=inviter_user_id,
+        ip=ip[:64],
+        screen=screen[:32],
+        device_model=device_model[:64],
+        user_agent=user_agent[:2000] if user_agent else "",  # 截一下防异常长 UA
+    )
+    db.add(fp)
+    db.commit()
+    db.refresh(fp)
+    return fp
+
+
+def resolve_inviter_by_fingerprint(
+    db: Session,
+    *,
+    ip: str,
+    screen: str,
+    device_model: str,
+    window_days: int,
+) -> User | None:
+    """根据指纹反查邀请人(time window 内最近一条匹配)。
+
+    匹配规则:(ip, device_model) 相等 + created_at > now - window_days。
+
+    screen 字段**只入库不反查**:浏览器算物理像素走 `CSS × devicePixelRatio` 路径、
+    Android 走 `DisplayMetrics.widthPixels` 真实硬件值,两端浮点 round 必然 ±1 像素漂移
+    (DPR 不严格是整数)→ 严格匹配注定撞不上。同 device_model 必同 screen(同型号同硬件)
+    → screen 是冗余字段,删它不损精度。撞错只有"同 IP 下同型号手机同时被邀请"才会
+    发生,中国家庭/公司 WiFi 场景概率极低。
+    """
+    if not ip:
+        return None
+    from datetime import datetime, timedelta, timezone
+    cutoff = datetime.now(timezone.utc) - timedelta(days=window_days)
+    fp = db.execute(
+        select(InviteFingerprint)
+        .where(
+            InviteFingerprint.ip == ip,
+            InviteFingerprint.device_model == device_model,
+            InviteFingerprint.created_at > cutoff,
+        )
+        .order_by(InviteFingerprint.created_at.desc())
+        .limit(1)
+    ).scalar_one_or_none()
+    if fp is None:
+        return None
+    return db.get(User, fp.inviter_user_id)
diff --git a/app/schemas/invite.py b/app/schemas/invite.py
index ecff181..0564595 100644
--- a/app/schemas/invite.py
+++ b/app/schemas/invite.py
@@ -1,6 +1,8 @@
 """邀请相关 API 收发模型。"""
 from __future__ import annotations
 
+from datetime import datetime
+
 from pydantic import BaseModel, Field
 
 
@@ -11,15 +13,61 @@ class InviteInfoOut(BaseModel):
     coins_earned: int               # 累计从邀请获得的金币
 
 
+class LandingTrackIn(BaseModel):
+    """落地页 dl.html 访问时上报的指纹(用于剪贴板归因失败时兜底)。"""
+    ref: str = Field(..., min_length=4, max_length=16, description="邀请码(落地页 ?ref=)")
+    screen: str = Field("", max_length=32, description="屏幕分辨率,如 1080x2400")
+    # IP / UA 服务端从 HTTP 头自动拿,无需 JS 上报
+
+
+class LandingTrackOut(BaseModel):
+    status: str                     # ok / invalid_code / no_ip
+
+
+class FingerprintIn(BaseModel):
+    """客户端登录后剪贴板归因失败时上报的设备指纹。
+
+    跨端匹配字段:浏览器落地页存的同名字段 == 客户端 Build.MODEL / DisplayMetrics 算的值。
+    IP 服务端从 HTTP 头拿,不在这里。
+    """
+    screen: str = Field("", max_length=32)
+    device_model: str = Field("", max_length=64)
+
+
 class BindInviteIn(BaseModel):
-    invite_code: str = Field(..., min_length=4, max_length=16, description="邀请人的邀请码")
+    # invite_code: 可选 — 走指纹兜底时为空(channel=fingerprint)
+    invite_code: str | None = Field(
+        None, max_length=16, description="邀请码;走指纹兜底时为空"
+    )
     channel: str = Field(
         "clipboard", max_length=16,
-        description="归因来源:clipboard(首启读剪贴板自动) / manual(用户手动填)",
+        description="归因来源:clipboard(首启读剪贴板自动) / manual(手动填) / fingerprint(指纹兜底)",
     )
+    # 当 invite_code 为空、channel=fingerprint 时,后端用这组指纹反查
+    fingerprint: FingerprintIn | None = None
 
 
 class BindInviteOut(BaseModel):
-    status: str                     # success / already_bound / invalid_code / self_invite / not_eligible
+    status: str                     # success / already_bound / invalid_code / self_invite / not_eligible / fp_not_found
     coins_awarded: int              # 本次给当前用户(被邀请人)发的金币
     message: str                    # 给前端直接展示的文案
+
+
+class InviteeItem(BaseModel):
+    """被邀请人列表的一条(邀请页小窗 / 完整列表页共用)。
+
+    display_name / avatar_url 的"降级兜底"在后端算好(见 repositories/invite.get_invitees):
+    名字 = 昵称 → 微信昵称 → 脱敏手机号(前端拿不到完整号,必须后端脱敏);
+    头像 = 用户头像 → 微信头像 → null(前端拿到 null 画默认色块)。
+    """
+    display_name: str               # 已兜底好的显示名(真名/脱敏号)
+    avatar_url: str | None = None   # 头像 URL;null = 前端画默认色块
+    coins: int                      # 这次邀请给我(邀请人)发的金币
+    invited_at: datetime            # 邀请绑定时间(前端转"今天/3天前")
+
+
+class InviteeListOut(BaseModel):
+    """GET /invite/invitees 响应:被邀请人列表 + 分页。"""
+    items: list[InviteeItem]
+    total: int                      # 我邀请的总人数(用于"共 N 人")
+    has_more: bool                  # 还有下一页吗(完整列表页滚到底加载更多)
diff --git a/data/media/dl.html b/data/media/dl.html
index efb0d19..f8ec320 100644
--- a/data/media/dl.html
+++ b/data/media/dl.html
@@ -98,6 +98,27 @@
   var isAndroid = /Android/i.test(ua);
   var ref = new URLSearchParams(location.search).get("ref");  // 邀请码(来自二维码 URL ?ref=)
 
+  // 【任务 3】指纹归因兜底:页面加载即上报访问者指纹,后端存 invite_fingerprint 表。
+  // 当 APK 首启读剪贴板失败(被覆盖)时,客户端会用 (IP+屏幕+UA 解析的手机型号) 反查
+  // 本表 7 天内最近一条匹配 → 撞库出原邀请人 → 走原 bind 流程。
+  // 任何失败都 silent(不影响下载主流程);后端 invalid_code/no_ip 也只返 200。
+  if (ref) {
+    // screen 报【物理像素】= CSS 像素 × devicePixelRatio,跟 Android dm.widthPixels(物理像素)对齐。
+    // 不同设备 DPR 不同(常见 2/2.5/3/3.5),CSS 像素直接报会跟客户端不对齐 → 撞不上库。
+    var _dpr = window.devicePixelRatio || 1;
+    var _sw = Math.round(screen.width * _dpr);
+    var _sh = Math.round(screen.height * _dpr);
+    fetch("/api/v1/invite/landing-track", {
+      method: "POST",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify({
+        ref: ref,
+        screen: _sw + "x" + _sh,
+        // IP / UA 服务端从 HTTP 头自动拿,无需 JS 上报
+      }),
+    }).catch(function () {});  // silent,绝不阻断下载
+  }
+
   // 把邀请码写进剪贴板,APK 首启时读出来完成归因(deferred deeplink 的关键一步)。
   // 浏览器要求:必须在用户点击手势里调用 + HTTPS 下才允许写。
   function legacyCopy(payload) {                // 老 webview / 无 clipboard API 兜底
diff --git a/pyproject.toml b/pyproject.toml
index 3516321..aa4ba63 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -34,6 +34,9 @@ dependencies = [
 
     # admin 后台账号密码 hash(用户侧是手机号+验证码登录,不需要密码;admin 才用)
     "bcrypt>=4.0.0",
+
+    # 邀请指纹归因:解析浏览器 UA 拿手机型号(Build.MODEL),跨端匹配用
+    "user-agents>=2.2.0",
 ]
 
 [project.optional-dependencies]
diff --git a/scripts/seed_invitee_avatar_test.py b/scripts/seed_invitee_avatar_test.py
new file mode 100644
index 0000000..4052ed9
--- /dev/null
+++ b/scripts/seed_invitee_avatar_test.py
@@ -0,0 +1,91 @@
+# -*- coding: utf-8 -*-
+"""造测试数据验证邀请列表"真实头像能不能连上"。
+
+A 邀请 B1(上传真实头像)/B2(无头像→色块)/B3(设昵称→色块), 然后:
+  ① 打印 A 的邀请码 + /invitees 返回(看 B1 有 avatar_url、B2 空、B3 昵称);
+  ② 直接 HTTP 访问 B1 的头像地址,确认文件能取到(后端静态托管通)。
+前端 AsyncImage 实际显示,装机后真机用 A 登录看。
+
+跑: <app-server py> scripts/seed_invitee_avatar_test.py"""
+import io
+import struct
+import sys
+import zlib
+
+import httpx
+
+sys.stdout = io.TextIOWrapper(sys.stdout.buffer, encoding="utf-8")
+
+BASE = "http://127.0.0.1:8770"
+
+
+def solid_png(size: int = 96, rgb: tuple = (80, 140, 240)) -> bytes:
+    """生成一张纯色 PNG(蓝色 96x96),够真机看清、魔数是合法 PNG。"""
+    row = b"\x00" + bytes(rgb) * size
+    raw = row * size
+    comp = zlib.compress(raw)
+
+    def chunk(typ: bytes, data: bytes) -> bytes:
+        c = typ + data
+        return struct.pack(">I", len(data)) + c + struct.pack(">I", zlib.crc32(c) & 0xFFFFFFFF)
+
+    sig = b"\x89PNG\r\n\x1a\n"
+    ihdr = struct.pack(">IIBBBBB", size, size, 8, 2, 0, 0, 0)  # 8bit, RGB
+    return sig + chunk(b"IHDR", ihdr) + chunk(b"IDAT", comp) + chunk(b"IEND", b"")
+
+
+def login(c: httpx.Client, phone: str) -> str:
+    c.post(f"{BASE}/api/v1/auth/sms/send", json={"phone": phone})
+    r = c.post(f"{BASE}/api/v1/auth/sms/login", json={"phone": phone, "code": "123456"})
+    r.raise_for_status()
+    return r.json()["access_token"]
+
+
+def auth(tok: str) -> dict:
+    return {"Authorization": f"Bearer {tok}"}
+
+
+with httpx.Client(timeout=15) as c:
+    # A = 邀请人(真机用它登录看)
+    A_PHONE = "13900008001"
+    a_tok = login(c, A_PHONE)
+    a_code = c.get(f"{BASE}/api/v1/invite/me", headers=auth(a_tok)).json()["invite_code"]
+    print(f"邀请人 A: 手机号={A_PHONE} 验证码=123456 邀请码={a_code}")
+
+    # B1: 绑 A 码 + 上传真实头像
+    b1 = login(c, "13900008002")
+    c.post(f"{BASE}/api/v1/invite/bind", json={"invite_code": a_code}, headers=auth(b1))
+    r = c.post(
+        f"{BASE}/api/v1/user/avatar",
+        headers=auth(b1),
+        files={"file": ("avatar.png", io.BytesIO(solid_png()), "image/png")},
+    )
+    print(f"B1 绑定 + 上传头像 -> HTTP {r.status_code}, avatar_url={r.json().get('avatar_url')!r}")
+
+    # B2: 绑 A 码, 不传头像(测色块兜底)
+    b2 = login(c, "13900008003")
+    c.post(f"{BASE}/api/v1/invite/bind", json={"invite_code": a_code}, headers=auth(b2))
+    print("B2 绑定, 无头像(测色块)")
+
+    # B3: 绑 A 码 + 设昵称(测昵称优先 + 色块)
+    b3 = login(c, "13900008004")
+    c.post(f"{BASE}/api/v1/invite/bind", json={"invite_code": a_code}, headers=auth(b3))
+    c.patch(f"{BASE}/api/v1/user/profile", json={"nickname": "测试昵称"}, headers=auth(b3))
+    print("B3 绑定 + 昵称='测试昵称'")
+
+    # A 的邀请列表
+    inv = c.get(f"{BASE}/api/v1/invite/invitees", headers=auth(a_tok)).json()
+    print(f"\n=== A 的 /invitees (共 {inv['total']} 人) ===")
+    for it in inv["items"]:
+        print(f"  name={it['display_name']!r}  avatar={it['avatar_url']!r}  coins={it['coins']}  time={it['invited_at']}")
+
+    # 关键: 直接 HTTP 取 B1 的头像文件, 确认后端静态托管能 serve(= 前端拿这地址也能加载)
+    b1_avatar = next((it["avatar_url"] for it in inv["items"] if it["avatar_url"]), None)
+    print("\n=== 头像文件 HTTP 可访问性(后端静态托管) ===")
+    if b1_avatar:
+        rr = c.get(f"{BASE}{b1_avatar}")
+        ok = rr.status_code == 200 and (rr.headers.get("content-type", "").startswith("image"))
+        print(f"  GET {BASE}{b1_avatar}")
+        print(f"  -> HTTP {rr.status_code}, content-type={rr.headers.get('content-type')}, {len(rr.content)} bytes  {'✅ 能取到' if ok else '✗ 取不到'}")
+    else:
+        print("  没有带头像的被邀请人?!")
diff --git a/tests/test_invite.py b/tests/test_invite.py
index 3064ef8..574adad 100644
--- a/tests/test_invite.py
+++ b/tests/test_invite.py
@@ -1,4 +1,4 @@
-"""好友邀请测试:邀请码、绑定、双方发金币、幂等、自邀/无效码屏蔽。
+"""好友邀请测试:邀请码、绑定、双方发金币、幂等、自邀/无效码屏蔽、指纹兜底归因。
 
 用 sms mock 登录拿 token(同 test_welfare),再跑邀请闭环。
 """
@@ -6,12 +6,16 @@ from __future__ import annotations
 
 from datetime import datetime, timedelta, timezone
 
+from sqlalchemy import select
+
 from app.core.rewards import (
+    INVITE_FP_WINDOW_DAYS,
     INVITE_INVITEE_COINS,
     INVITE_INVITER_COINS,
     INVITE_NEW_USER_WINDOW_HOURS,
 )
 from app.db.session import SessionLocal
+from app.models.invite_fingerprint import InviteFingerprint
 from app.repositories.user import get_user_by_phone
 
 
@@ -158,3 +162,216 @@ def test_old_user_not_eligible(client) -> None:
     assert r.json()["coins_awarded"] == 0
     assert _coin_balance(client, b) == 0
     assert _coin_balance(client, a) == 0
+
+
+# =====================================================================
+# 任务 3:指纹归因(剪贴板兜底,见 brain [[invite-three-tasks]])
+# =====================================================================
+
+def test_landing_track_records_fingerprint(client) -> None:
+    """落地页 POST /landing-track 成功存指纹(无需鉴权)。"""
+    a = _login(client, "13800002040")
+    a_code = _my_code(client, a)
+    # 浏览器无 token 调
+    r = client.post(
+        "/api/v1/invite/landing-track",
+        json={"ref": a_code, "screen": "1080x2400"},
+    )
+    assert r.status_code == 200, r.text
+    assert r.json()["status"] == "ok"
+
+
+def test_landing_track_invalid_code(client) -> None:
+    """无效邀请码 → invalid_code(silent 返,不影响落地页下载流程)。"""
+    r = client.post(
+        "/api/v1/invite/landing-track",
+        json={"ref": "ZZZZZZ", "screen": "1080x2400"},
+    )
+    assert r.status_code == 200, r.text
+    assert r.json()["status"] == "invalid_code"
+
+
+def test_bind_by_fingerprint_success(client) -> None:
+    """B 落地页存指纹 → B 登录后用指纹兜底绑定成功(模拟剪贴板被覆盖丢失)。"""
+    a = _login(client, "13800002041")
+    a_code = _my_code(client, a)
+
+    # 1. B 浏览器(无 token)访问落地页 → 存指纹
+    r1 = client.post(
+        "/api/v1/invite/landing-track",
+        json={"ref": a_code, "screen": "1234x5678"},  # 用独特 screen 避免跟其它测试撞
+    )
+    assert r1.json()["status"] == "ok"
+
+    # 2. B 注册登录(剪贴板被覆盖,没拿到邀请码)
+    b = _login(client, "13800002042")
+
+    # 3. B 不带 invite_code,只带 fingerprint 走兜底
+    r2 = client.post(
+        "/api/v1/invite/bind",
+        json={
+            "channel": "fingerprint",
+            "fingerprint": {"screen": "1234x5678", "device_model": ""},
+        },
+        headers=_auth(b),
+    )
+    assert r2.status_code == 200, r2.text
+    assert r2.json()["status"] == "success"
+    # 双方各发金币
+    assert _coin_balance(client, a) == INVITE_INVITER_COINS
+    assert _coin_balance(client, b) == INVITE_INVITEE_COINS
+
+
+def test_bind_by_fingerprint_not_found(client) -> None:
+    """没有匹配的指纹记录 → fp_not_found,不发奖。"""
+    b = _login(client, "13800002043")
+    r = client.post(
+        "/api/v1/invite/bind",
+        json={
+            "channel": "fingerprint",
+            "fingerprint": {"screen": "0000x9999", "device_model": "no_such_model"},
+        },
+        headers=_auth(b),
+    )
+    assert r.status_code == 200, r.text
+    assert r.json()["status"] == "fp_not_found"
+    assert r.json()["coins_awarded"] == 0
+    assert _coin_balance(client, b) == 0
+
+
+def test_bind_by_fingerprint_outside_window(client) -> None:
+    """指纹记录超出 INVITE_FP_WINDOW_DAYS 窗口 → fp_not_found。
+
+    用独特设备型号隔离:测试环境所有请求 IP 都是 testclient、落地页默认无 UA(解析出的
+    型号="")，而指纹反查按 (IP, 型号) 匹配 → 会串到别的测试残留的、没过期的 model=""
+    指纹上(误判 success)。这里给落地页传一个独特 UA(解析出独特型号 OUTWIN9X),反查只可能
+    命中本测试自己的指纹,"过期就反查不到"才验得准。
+    """
+    a = _login(client, "13800002044")
+    a_code = _my_code(client, a)
+
+    # 落地页存指纹(独特 UA → 独特型号 OUTWIN9X),再手动把 created_at 改到窗口外
+    unique_screen = "2222x3333"
+    unique_ua = "Mozilla/5.0 (Linux; Android 13; OUTWIN9X Build/TQ) AppleWebKit/537.36"
+    r1 = client.post(
+        "/api/v1/invite/landing-track",
+        json={"ref": a_code, "screen": unique_screen},
+        headers={"user-agent": unique_ua},
+    )
+    assert r1.json()["status"] == "ok"
+
+    with SessionLocal() as db:
+        fp = db.execute(
+            select(InviteFingerprint).where(InviteFingerprint.screen == unique_screen)
+        ).scalar_one()
+        fp.created_at = datetime.now(timezone.utc) - timedelta(days=INVITE_FP_WINDOW_DAYS + 1)
+        db.commit()
+
+    b = _login(client, "13800002045")
+    r = client.post(
+        "/api/v1/invite/bind",
+        json={
+            "channel": "fingerprint",
+            "fingerprint": {"screen": unique_screen, "device_model": "OUTWIN9X"},
+        },
+        headers=_auth(b),
+    )
+    assert r.status_code == 200, r.text
+    assert r.json()["status"] == "fp_not_found"
+    assert _coin_balance(client, a) == 0
+    assert _coin_balance(client, b) == 0
+
+
+def test_bind_no_code_no_fingerprint(client) -> None:
+    """既没邀请码也没指纹 → invalid_code(无效请求)。"""
+    b = _login(client, "13800002046")
+    r = client.post(
+        "/api/v1/invite/bind",
+        json={"channel": "fingerprint"},  # 没 invite_code、没 fingerprint
+        headers=_auth(b),
+    )
+    assert r.status_code == 200, r.text
+    assert r.json()["status"] == "invalid_code"
+    assert _coin_balance(client, b) == 0
+
+
+# =====================================================================
+# 被邀请人列表 GET /invitees(邀请页小窗 + 完整列表页共用)
+# =====================================================================
+
+def test_invitees_basic(client) -> None:
+    """A 邀 B、C → 列表返 2 条、total=2、没设资料的名字=脱敏手机号、头像 null、金币对。"""
+    a = _login(client, "13800002050")
+    a_code = _my_code(client, a)
+    for phone in ("13800002051", "13800002052"):
+        u = _login(client, phone)
+        client.post("/api/v1/invite/bind", json={"invite_code": a_code}, headers=_auth(u))
+
+    r = client.get("/api/v1/invite/invitees", headers=_auth(a))
+    assert r.status_code == 200, r.text
+    body = r.json()
+    assert body["total"] == 2
+    assert body["has_more"] is False
+    assert len(body["items"]) == 2
+    # 没设昵称头像 → 名字脱敏手机号、头像 null(不依赖顺序用 set)
+    names = {it["display_name"] for it in body["items"]}
+    assert names == {"138****2051", "138****2052"}
+    assert all(it["avatar_url"] is None for it in body["items"])
+    assert all(it["coins"] == INVITE_INVITER_COINS for it in body["items"])
+
+
+def test_invitees_order_desc(client) -> None:
+    """按邀请时间倒序:最近邀请的在最前(手动拉开时间,避开 SQLite 秒级精度)。"""
+    from app.models.invite import InviteRelation
+    a = _login(client, "13800002060")
+    a_code = _my_code(client, a)
+    b = _login(client, "13800002061")
+    c = _login(client, "13800002062")
+    client.post("/api/v1/invite/bind", json={"invite_code": a_code}, headers=_auth(b))
+    client.post("/api/v1/invite/bind", json={"invite_code": a_code}, headers=_auth(c))
+    with SessionLocal() as db:
+        ub = get_user_by_phone(db, "13800002061")
+        rel_b = db.execute(
+            select(InviteRelation).where(InviteRelation.invitee_user_id == ub.id)
+        ).scalar_one()
+        rel_b.created_at = datetime.now(timezone.utc) - timedelta(hours=2)
+        db.commit()
+    items = client.get("/api/v1/invite/invitees", headers=_auth(a)).json()["items"]
+    assert items[0]["display_name"] == "138****2062"  # C 刚邀,在前
+    assert items[1]["display_name"] == "138****2061"  # B 2 小时前,在后
+
+
+def test_invitees_nickname_priority(client) -> None:
+    """设了昵称的被邀请人 → 名字用昵称(优先于脱敏手机号)。"""
+    a = _login(client, "13800002070")
+    a_code = _my_code(client, a)
+    b = _login(client, "13800002071")
+    client.post("/api/v1/invite/bind", json={"invite_code": a_code}, headers=_auth(b))
+    with SessionLocal() as db:
+        u = get_user_by_phone(db, "13800002071")
+        u.nickname = "小明"
+        db.commit()
+    items = client.get("/api/v1/invite/invitees", headers=_auth(a)).json()["items"]
+    assert items[0]["display_name"] == "小明"
+
+
+def test_invitees_pagination(client) -> None:
+    """分页:limit=1 → 1 条 + has_more=True;offset=1 → 第 2 条 + has_more=False。"""
+    a = _login(client, "13800002080")
+    a_code = _my_code(client, a)
+    for phone in ("13800002081", "13800002082"):
+        u = _login(client, phone)
+        client.post("/api/v1/invite/bind", json={"invite_code": a_code}, headers=_auth(u))
+
+    p1 = client.get("/api/v1/invite/invitees?limit=1&offset=0", headers=_auth(a)).json()
+    assert len(p1["items"]) == 1 and p1["total"] == 2 and p1["has_more"] is True
+    p2 = client.get("/api/v1/invite/invitees?limit=1&offset=1", headers=_auth(a)).json()
+    assert len(p2["items"]) == 1 and p2["has_more"] is False
+
+
+def test_invitees_empty_and_auth(client) -> None:
+    """没邀请人 → 空列表;不带 token → 401。"""
+    a = _login(client, "13800002090")
+    body = client.get("/api/v1/invite/invitees", headers=_auth(a)).json()
+    assert body["total"] == 0 and body["items"] == [] and body["has_more"] is False
+    assert client.get("/api/v1/invite/invitees").status_code == 401