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Category · SDKs

SDKs & Client Libraries by Language

Drop-in x402 and agent-payment libraries for your stack.

The fastest way to add pay-per-request to a service is a language-native SDK: server middleware that returns the 402 challenge and verifies payment, plus a client wrapper that lets an agent pay automatically. The ecosystem ships libraries for TypeScript/Node.js (the largest slice), Python (the language of AI), Rust (performance-critical facilitators) and Go (payment middleware and services).

Pick your language below to see every tracked library, ranked by GitHub stars. Most wrap the same x402 handshake, so switching languages rarely means re-learning the flow.

SDKs categories

TypeScript 852

The largest language slice of the x402 ecosystem.

Python 230

Add a pay-per-request paywall to FastAPI, Flask & Python clients.

Rust 73

High-performance x402 payment handling in Rust.

Go 48

x402 middleware and clients for Go services.

Top sdks projects

The most-starred projects across all sdks categories.

Your AI trading terminal assistant for US stocks, commodities, forex, and crypto.

⭐ 12.5kGo

The agent-native LLM router for OpenClaw. 41+ models, <1ms routing, USDC payments on Base & Solana via x402.

⭐ 6.7kTypeScript

A payments protocol for the internet. Built on HTTP.

⭐ 6.3kTypeScript

A local-first AI agent with persistent memory, emotional intelligence, and a peer-to-peer skills economy.

⭐ 2.4kTypeScript

The living ecosystem where AI agents complete tasks through workflow loops, improve through iterative execution, are evaluated by mentor agents or humans in the loop, and turn completed work into reusable work experience and data to improve future agents.

⭐ 1.3kPython

Self-healing infrastructure for AI agent payments. 90.3% auto-recovery.

⭐ 822TypeScript

The AI agent with a wallet — spends USDC autonomously to get real work done. Apache-2.0, TypeScript.

⭐ 624TypeScript

Daydreams is a set of tools for building agents for commerce

⭐ 611TypeScript

The first agentic payment network: policy-controlled, gasless, and real money-ready. OmniClaw CLI + Financial Policy Engine let autonomous agents pay and earn safely at machine speed.

⭐ 573Python

Agent behavior that compiles

⭐ 564Rust

The A2A x402 Extension brings cryptocurrency payments to the Agent-to-Agent (A2A) protocol, enabling agents to monetize their services through on-chain payments. This extension revives the spirit of HTTP 402 "Payment Required" for the decentralized agent ecosystem.

⭐ 536Python

An open SDK for agentic payments. Let AI agents make payments, hold funds, and move money across chains with policy enforcement and human approval built in.

⭐ 526Rust