◆ 24K LABS THE GOLD‑402 INDEX

04 SDKs & Libraries 46

Code you import rather than call. Most of this shelf has no endpoint to knock, so the stamp means the repository answered — public, resolving, alive. Being honest about the difference is the point.

— a README that respects you —

46 of 505 curated services sit on this shelf. 44 carry a dated knock; most recent . A knock is one HTTP request that got an answer — not a delivery test. Read a stamp as reachable and speaks the protocol, never as worth the money.

  • @bridgenode/llm Drop-in OpenAI TypeScript client with automatic x402 payment support on Solana USDC: gasless, no API keys,…
  • a2a-x402-typescript Complete TypeScript implementation combining Google's A2A protocol with x402 payments.
  • ag402 Payment layer for AI agents using x402.
  • Agent Wallet SDK Non-custodial smart contract wallets for AI agents.
  • alloy High-performance Ethereum library used for Rust x402 signing.
  • Azeth SDK TypeScript SDK with x402 client (`fetch402`), ERC-4337 smart accounts, on-chain reputation feedback, and ER…
  • bridgenode-llm Drop-in OpenAI Python client with automatic x402 payment support on Solana USDC: gasless, no API keys, pay…
  • cipher-x402-client Lightweight TS/JS x402 v2 client.
  • ClawPay MCP Non-custodial x402 payment layer for AI agents.
  • ethers.js Alternative Ethereum library for signing.
  • feeless402 — Client and merchant server for x402 over the Nano (XNO) rail: CLI pays any x402 v2 endpoint, FastAPI mercha…
  • genlayer-x402 x402 for GenLayer Intelligent Contracts.
  • mcp-go-x402 x402 payment transport for MCP-Go clients and servers.
  • Mogami Production-ready Java x402 stack.
  • MoltsPay Payment infrastructure for AI agents.
  • MoltsPay Python Python SDK for x402 agent payments.
  • open402 Wire-compatible protocol layer of the ag402 project.
  • pay-kit Agentic commerce building blocks (x402, MPP, AP2) for TypeScript, Rust, Go, Python.
  • PayBot SDK TypeScript SDK for integrating x402 into AI agents and bots.
  • primer-x402 Python SDK for x402 payments — pay and charge for APIs with stablecoins.
  • PRXVT Privacy SDK Privacy layer for x402.
  • r402 Rust SDK for the x402 payment protocol by qntx.
  • ra2a Rust SDK for the Agent2Agent (A2A) Protocol with x402 integration.
  • Solana Foundation Pay Official Solana Foundation library for handling x402 and MPP payment challenges with user-authorized stable…
  • solana-x402 Zero-dependency x402 resource server for Solana.
  • Spillway Subscription payment channels on Stellar using x402.
  • tryx402 — Budget router and execution gateway over x402: hard session budget caps, idempotent paid calls, cost ledger…
  • use-agently Routing and settlement layer for AI agents.
  • viem TypeScript library used for signing x402 payments.
  • x402 Official Python SDK.
  • x402 Payment Harness Python library + CLI for x402 without Coinbase CDP wallet.
  • x402-dotnet x402 Payment Protocol implementation for .NET.
  • x402-foundation/x402 (Go) Official Go implementation.
  • x402-go Community Go implementation by Mark III Labs.
  • x402-got Got HTTP client integration for x402.
  • x402-kit Fully modular, framework-agnostic Rust SDK.
  • x402-mcp Vercel's library for adding x402 paywalls to MCP servers via the AI SDK.
  • x402-mock Test/mock implementation of x402 for EVM blockchains.
  • x402-openai-python Drop-in OpenAI Python client with transparent x402 payment support.
  • x402-openai-typescript Drop-in OpenAI TypeScript client with transparent x402 payment support.
  • x402-pay Call any x402 API with one API key.
  • x402-rs Production-grade Rust implementation.
  • x402-typescript Official TypeScript implementation.
  • xrpl-x402-client Buyer-side Python SDK with `wrap_httpx_with_xrpl_payment`.
  • xrpl-x402-core Wire-level validation with CAIP-2 XRPL identifiers.
  • xrpl-x402-middleware Server-side middleware with `require_payment()`.