langchain-paypack 0.7.6

LangChain tool for PayPack: AI Agent autonomous payments (HTTP 402, x402, AP2)

⚠️ This package is legacy (local-signer mode). For Cloud mode: paypack-langchain · PyPI — pip install paypack-langchain

此包为旧版（本地签名模式）。Cloud 版请使用 paypack-langchain。

langchain-paypack: 让 AI Agent 拥有支付能力

🚀 在线控制台已上线：rhcjw.com/pay/dashboard — 注册即获 API Key，支付宝/微信充值，30 秒接入。

专为 AI Agent 设计的通用支付中间件。一行代码接入支付宝、微信支付及加密货币网络，打破生态壁垒，让 AI 自主完成跨平台交易。

---

为什么是 PayPack？| Why PayPack?

PayPack is the ONLY payment middleware that supports x402/AP2 crypto payments AND Alipay/WeChat fiat payments. PayPack 是唯一同时支持 x402/AP2 链上支付和支付宝/微信法币支付的 AI 支付中间件。

| Tool | Payment Method | Supports China Users? |

工具	支付方式	支持中国用户？
Ampersend	x402 + USDC	❌ No Alipay/WeChat
GOAT	Crypto	❌ No Alipay/WeChat
Stripe Agent Toolkit	Stripe (credit card)	❌ Foreign cards only
Nevermined	x402 protocol	❌ No Alipay/WeChat
Privy	Wallet infra	❌ No Alipay/WeChat
PayPack ✅	x402/AP2 + USDC/ETH + Alipay + WeChat Pay	✅ Open-source & free
PayPack Cloud ☁️	Managed payment API — Alipay + WeChat Pay	✅ Live at rhcjw.com/pay

While everyone asks "how does AI pay with USDC?", PayPack asks "how does AI pay with Alipay and WeChat?". 当所有人在琢磨"怎么让 AI 用 USDC 付钱"时，PayPack 在想"怎么让 AI 用支付宝和微信付钱"。

1.3 billion people in China use Alipay and WeChat — not USDC. Only PayPack serves this market. 国内 13 亿人用支付宝和微信，不用 USDC。这个市场，只有 PayPack 在做。

---

Quick Start | 快速开始

On-Chain Payment (ETH / USDC) | 链上支付

from paypack import AgentPay

pay = AgentPay(
    wallet_config={"private_key": "your-key"},
    network="base-sepolia",
    spend_limit_daily=10.0,
)

# AI auto-handles HTTP 402 payment requests | AI 自动处理 HTTP 402 支付要求
import requests
response = requests.get("https://api.data-provider.com/premium")
if response.status_code == 402:
    content = pay.auto_handle_402(response)

# Or send payment directly | 或直接发送支付
receipt = pay.send(to="0xRecipientAddress", amount=0.001, currency="USDC")
print(receipt["tx_hash"])

Alipay (CNY) | 支付宝支付（人民币）🏦

from paypack.signer.alipay import AlipaySigner
from paypack import AgentPay

# Two lines to integrate Alipay | 两行代码接入支付宝
signer = AlipaySigner(app_id="your APPID", private_key_path="key.pem",
                       alipay_public_key_path="alipay_public_key.pem", sandbox=True)
pay = AgentPay(signer=signer, network="alipay")

# AI pays in yuan | AI 直接付人民币
receipt = pay.send(to="user_alipay_id", amount=0.01, currency="CNY",
                   subject="AI Data Subscription | AI 数据订阅费")

# Web payment — generates cashier URL, user scans QR to pay | 电脑网站支付 — 生成收银台链接，用户扫码即付
pay_url = signer.page_pay(
    out_trade_no="ORDER_20260709_001",
    total_amount=9.90,
    subject="AI Agent API Monthly Fee | AI Agent API 调用月费",
    body="Auto-generated by PayPack | PayPack 自动生成的支付订单"
)
# User opens pay_url to complete payment | 用户打开 pay_url 即可扫码支付

WeChat Pay (CNY) | 微信支付（人民币）💚

# paypack_wechat is a commercial module, requires License Key
# paypack_wechat 为商业模块，需要 License Key
# Source includes a template: paypack_wechat_run.example.py | 开源代码包里包含示例模板
from paypack_wechat import WechatSigner
from paypack import AgentPay

signer = WechatSigner(
    mchid="Merchant ID | 商户号",
    serial_no="Certificate S/N | 证书序列号",
    private_key_path="apiclient_key.pem",
    api_v3_key="APIv3 Key | APIv3密钥",
    license_key="PAYPACK-WECHAT-v1-...",
    app_id="Mini Program AppID | 小程序AppID",
    notify_url="https://your-domain.com/wechat/notify",
)
pay = AgentPay(signer=signer, network="wechat")

# AI initiates WeChat Pay → frontend calls wx.requestPayment()
# AI 发起微信支付 → 前端调起 wx.requestPayment()
result = pay.send(
    to="User OpenID | 用户openid",
    amount=9.90,
    currency="CNY",
    subject="AI Monthly Subscription | AI 服务月费",
    app_id="Mini Program AppID | 小程序AppID",
)
# result["prepay_params"] passes directly to frontend | 直接传给前端调起支付

PayPack Cloud | 云托管服务 ☁️

不想自己管理密钥和商户号？直接用 PayPack Cloud API：

# 注册获取 API Key
curl -X POST https://rhcjw.com/pay/v1/register \
  -H "Content-Type: application/json" \
  -d '{"name": "myapp", "email": "[e-mail]"}'

# 创建支付宝支付
curl -X POST https://rhcjw.com/pay/v1/pay \
  -H "Authorization: Bearer ppk_xxx" \
  -d '{"amount": 0.01, "subject": "AI 服务", "channel": "alipay"}'

# 创建微信支付
curl -X POST https://rhcjw.com/pay/v1/pay \
  -H "Authorization: Bearer ppk_xxx" \
  -d '{"amount": 0.01, "subject": "AI 服务", "channel": "wechat"}'

LangChain Integration | LangChain 集成

from langchain_paypack import PayPackTool

tool = PayPackTool(
    private_key="0x...",
    wallet_address="0x...",
    network="base-sepolia",
    spend_limit_daily=10.0,
)

# AI Agent calls directly | AI Agent 直接调用
result = tool._run(to="0x...", amount=0.001, currency="USDC")

💡 Compare: integrating Alipay yourself means hundreds of pages of docs, hundreds of lines of code, sandbox/RSA2 signing/verify/callbacks. PayPack: two lines. 💡 对比：自己对接支付宝要读几百页文档、写几百行代码、处理沙箱/RSA2签名/验签/回调。PayPack 两行搞定。

Dify Plugin | Dify 插件

# In Dify: Plugins → Install from GitHub | 在 Dify 中：插件 → 从 GitHub 安装
# Enter: https://github.com/rhcjw/paypack

Or download paypack-0.1.2.difypkg and upload locally. | 或下载直接上传。

See QUICKSTART.md — 5-minute tutorial covering all three channels. | 详见 QUICKSTART.md — 5 分钟三路教程。

---

Current Status | 当前状态

| Channel | Sandbox/Test | Production | Fully Auto? |

通道	沙箱/测试	生产	全自动？
ETH / USDC (Base/Ethereum/Polygon/Arbitrum)	✅ Verified	✅ Live	✅ Yes
Alipay CNY	✅ Sandbox OK	✅ Production Verified (¥0.10 paid + refunded)	⚠️ User scans QR
WeChat Pay CNY	✅ Backend OK	✅ Production Verified (¥0.05 paid)	⚠️ User scans QR
PayPack Cloud ☁️	—	✅ Live at rhcjw.com/pay	✅ API Key auth

---

Architecture | 架构

       AI Agent Application
                │
                ▼
         PayPack SDK  ◄── You are here 你在这里
                │
        ┌───────┼───────┐
        │       │       │
  Protocol   Payment   Security
   Parser    Router    Fuse
  (x402/    (USDC/    (Limits/
   AP2)     CNY)       Audit)
        │       │       │
        └───────┼───────┘
                │
                ▼
    Settlement Networks
  (Base / Alipay / WeChat / More...)

PayPack doesn't invent new protocols. It wraps scattered capabilities into a single agent.pay(). PayPack 不发明新协议，而是把零散的能力封装成一个 agent.pay()。

---

Features | 功能

• Multi-Protocol | 多协议: x402 + AP2 auto-detect and route | 自动检测和路由
• 3-Channel | 三通道: USDC/ETH on-chain + Alipay CNY + WeChat Pay CNY
• Cloud API | 云托管: No key management needed, pay-as-you-go | 无需管理密钥，按次计费
• Signer Abstraction | 签名器抽象: LocalSigner (dev) / AWSKMSSigner (prod, key never leaves HSM)
• Nano-Payment | 纳米支付: ERC-4337 batch settlement, saves gas | 批量结算省 Gas
• Safety Fuse | 安全熔断: Daily spend limit, balance check, auditable receipts | 日限额、余额检查、可审计收据
• RPC Failover | RPC 故障转移: Multi-node auto-switch (v0.5) | 多节点自动切换
• Tx Retry | 交易重试: RBF + exponential backoff (v0.5) | RBF + 指数退避
• Limit Persistence | 限额持久化: Redis / SQLite / Memory (v0.5)
• LangChain Native | LangChain 原生: PayPackTool plug-and-play | 即插即用
• Dify Plugin | Dify 插件: v0.1.2 — pay/query/refund tools

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Supported Networks | 支持网络

Network	Chain ID	Currency	币种
Base Sepolia (testnet)	84532	ETH, USDC
Base Mainnet	8453	ETH, USDC
Ethereum Mainnet	1	ETH, USDC
Polygon Mainnet	137	POL, USDC
Arbitrum Mainnet	42161	ETH, USDC
**Alipay Sandbox	支付宝沙箱**	—	CNY
**Alipay Production ✅	支付宝生产**	—	CNY (¥0.10 verified)
**WeChat Pay ✅	微信支付**	—	CNY (¥0.05 verified)
PayPack Cloud ☁️	—	CNY	Live

---

Installation | 安装

pip install langchain-paypack

Or from Gitee (faster in China) | 或从 Gitee 安装（国内更快）：

pip install https://gitee.com/rhcjw_com/paypack/raw/master/dist/langchain_paypack-0.5.0-py3-none-any.whl

---

Verified Transactions | 已验证交易

Currency	Amount	Transaction	交易凭证
ETH	0.0001 ETH	d5f7ec94342c26a132289a9898ffd4885010089d1ddba19951117618a3992127
USDC	0.001 USDC	c4c24c4c1c8fd2ae738ed91cd87596ad2c672337b5ebf6d42a392adf61760e27
CNY (Alipay)	0.63 yuan	Sandbox TX: 2026070922001406640510096995
CNY (Alipay)	¥0.10	Production ✅ 2026071122001479581453918172 (paid + refunded)
CNY (WeChat)	¥0.05	Production ✅ Native QR scan & pay

---

Milestones | 里程碑

Version	Goal	目标	Status
v0.1	Base testnet x402 payment loop (ETH + USDC)	✅
v0.2	AP2 protocol support	✅
v0.3	LangChain plugin published	✅
v0.4	Signer abstraction + ERC-4337 batch settlement	✅
v0.5	RPC failover + retry + limit persistence	✅
🔌 Dify Plugin	Pay/Query/Refund tools	✅ v0.1.2
v0.6	Alipay production launch	✅ (¥0.10 paid + refunded on 2026-07-11)
v0.7	WeChat Pay production launch	✅ (¥0.05 paid on 2026-07-12)
v1.0	PayPack Cloud managed service	✅ Live at rhcjw.com/pay

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Why Now? | 为什么是现在？

• Stablecoin annual volume hit $33 trillion (2025) — 20x PayPal | 稳定币年交易量突破 $33 万亿
• AI Agent count projected at 22 billion (McKinsey) | AI Agent 数量预计达 220 亿
• x402 protocol already processes tens of millions of tx on Solana | x402 协议已在 Solana 上处理数千万笔交易
• LangChain/LlamaIndex payment plugin market is completely empty | 支付插件市场完全空白
• Alipay "AI Pay" initiative launching 2026 — PayPack is the first to bridge it with x402 | 支付宝"AI 付"计划 2026 年启动

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Target Users: Chinese AI Developers | 目标用户：国内 AI 开发者

PayPack isn't just for LangChain. Hundreds of thousands of developers use these platforms — none of them have payment tools. PayPack 不只是 LangChain 生态的工具。国内数十万开发者在用这些平台——它们全都没有支付工具。

Platform	Users	用户量	Has Payment?	有支付工具吗？
Dify	100K+	数十万	✅ PayPack Plugin
Coze (ByteDance)	1M+	数百万	❌ None
Baidu Qianfan	100K+	数十万	❌ None
Tongyi Bailian	100K+	数十万	❌ None

These developers are PayPack's real users. | 这些平台的开发者，才是 PayPack 真正的用户。

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Roadmap | 路线图

Phase	Milestone	里程碑	Status
v0.1-v0.7	x402/AP2 + Alipay/WeChat integration	双协议双通道	✅ Done
v1.0	PayPack Cloud live	云服务上线	✅ Live
v1.1	AI Service Price Index (alpha) — anonymized pricing from Dify plugin transactions, published as a neutral oracle	AI 服务价格指数（α版）	🔜 Planned
v1.2	Catalog — 20+ API vendors with SLA guarantees	API 厂商目录	🔜 Planned
v2.0	SLA Arbitration — neutral dispute resolution for Agent-to-API payments	中立仲裁层	🔜 Future

PayPack stays neutral by design — open to all platforms, all channels. No strategic investor gets a veto. The Price Index is aggregated, anonymized, and platform-agnostic.

价格指数：基于真实 Agent 支付交易的匿名脱敏数据，输出中立定价 oracle，全程不向任何大厂倾斜。

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Links | 链接

Channel	URL	渠道
GitHub	https://github.com/rhcjw/paypack
Gitee (China Mirror)	https://gitee.com/rhcjw_com/paypack	Gitee（国内镜像）
PyPI	https://pypi.org/project/langchain-paypack/
PayPack Cloud	https://rhcjw.com/pay	云服务
Dify Plugin	paypack-0.1.2.difypkg	Dify 插件
Quick Start	QUICKSTART.md	快速入门

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Contributing | 贡献

Star the repo, open an issue, or mention PayPack in Dify/Coze communities — every bit helps. Star ⭐、提 Issue、或者在 Dify/Coze 社区里提到 PayPack，都是贡献。

License | 许可证

Apache License 2.0. See LICENSE.