Ethereum & EVM x402 Payment Projects

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x402-openai-python

by qntx

Drop-in OpenAI Python client with transparent x402 payment support.

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mppx

by wevm

TypeScript Interface for Machine Payments Protocol

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x402-openai-typescript

by qntx

Drop-in OpenAI Typescript client with transparent x402 payment support.

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tdm-integration-kit

by ToDealMarket

Developer integration tools for adding TDM payments to AI agents, apps, and workflows. CLI, MCP server, and copy-paste examples

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tdm-sdk

by ToDealMarket

Open contract-facing SDK for payable routes and gateway-backed integrations. Thin public surface for authorize, checkout, and session flows.

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TDM-Agent-Integration-Kit

by ToDealMarket

Developer integration tools for adding TDM payments to AI agents, apps, and workflows. CLI, MCP server, and copy-paste examples

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SubEtha

by peaceandwhisky

Private x402 payments on zERC20 — hide who paid whom, not the price tag.

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x402-erc8004-agent

by Trustdev-eth

AI agent stack that combines A2A messaging + x402 micropayments + ERC‑8004 identity(trustless agent).

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piprail

by piprail

x402 (HTTP 402 Payment Required) SDK + MCP server: let any API charge for itself and any AI agent pay for itself, USDC & stablecoins across EVM, Solana & 8 more chain families, in a couple of lines. Backendless, no fee, self-custodial, paid straight to your wallet. TypeScript, MIT.

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awesome-x402-on-base

by Daehan-Base

Korean resources and tutorials for x402 payment protocol on Base chain

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payflow

by chainbound

A toolkit for building micropayment-gated MCP servers

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strands-erc8004

by cagataycali

Give your AI agent an on-chain identity in one line.

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xByte

by Arvmor

xByte infra; facilitates “Pay-per-Byte” x402 payments.

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SafeLink

by charliebot8888

Security-first MCP skill for agent-to-agent hiring with escrowed USDC payments, x402 micropayments, and policy-gated on-chain execution

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helixa

by Bendr-20

Original Helixa / AgentDNA / Cred implementation and reference materials. New Multipass development: github.com/Bendr-20/multipass.

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anypayx.com

by anypay

Whether you're running an online store or a retail location, we have the tools you need to start accepting crypto payments.

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Sentinel

by valeo-cash

Enterprise audit, compliance & budget enforcement layer for the x402 payment protocol

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dexter-x402-sdk

by Dexter-DAO

Give your agent a spending limit it can't exceed. Non-custodial tabs on Solana, plus one-shot x402 across the major EVM chains. Buyer + seller SDKs.

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erc1066-x402

by Hyperkit-Labs

A set of Ethereum-compatible smart contracts that standardize status codes, policy checks, and intent validation for Web3 transactions, designed to integrate cleanly with an HTTP/x402 gateway and agent layer.

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NodusAI-Your-Prediction-Oracle

by luacantu

NodusAI is an Oracle API that produces grounded, probabilistic market signals

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Daipay

by DAIPAY

Daipay is a Maker DAI based Open-source stable cryptocurrency payment processor with shopping cart and mobile payments http://www.daipay.io/

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x402-refunds-poc

by PraneshASP

PoC for x402 refunds using seller signed receipts

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x402-dart

by minhqdao

Dart implementation of the x402 payment protocol. 🎯

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x402-fetch

by LoserLab

Drop-in fetch wrapper that auto-pays HTTP 402 endpoints on Abstract.

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multiclaw

by primer-systems

Portable desktop/USB app for multi-agent x402 and key management. Get a grip on your agents!

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multi-chain-x402-payment-protocol

by solcanine

⚡ x402 — Internet-Native Payments Protocol with AI Agent 🤖 A next-generation payment protocol enabling seamless, programmable internet transactions powered by AI agents. Designed for automation, micro-payments, and intelligent on-chain interactions across decentralized ecosystems.

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agentforge

by aniruddhaadak80

An autonomous marketplace where OpenClaw AI agents discover, hire, and pay each other for specialized tasks via x402 USDC micropayments.

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X402-Payment-System

by keidev-sol

One line of code to accept digital dollars. HTTP-native x402 payment protocol for blockchain payments with Express middleware and Axios client support.

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x402-icp

by Canister-Software

x402 library for creating server resources and clients using the Internet Computer (ICP) blockchain.

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x402-core

by FlowMCP

Multi-chain ERC20 payment layer using EIP-3009 signed authorizations — client and server building blocks with CAIP-2 network routing.

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awesome-402

by stabloshi

A curated list of awesome resources, libraries, tools and more implementing HTTP 402.

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sdk

by commandlayer

CommandLayer SDKs for TypeScript and Python to call ENS-addressed agent verbs and verify signed receipts against canonical schemas, IPFS mirrors, and release checksums.

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x402-cross-chain-confidential-micropayment

by masaun

x402 Cross Chain Confidential Payment built on Aztec Network, which the smart contract is written in Noir.

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tempo-app

by rebulon

Web app on Tempo Moderato testnet: passkey auth, DEX swaps, TIP-20 tokens, payments with memo

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mnemospark-backend

by pawlsclick

Serverless REST API on AWS: ETH wallet based authorization, x402-style paid flows, USDC settlement on Base with DynamoDB-backed quotes, payments, and storage APIs.

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sources-eth-x402

by RWA-ID

sources.eth — x402 AI Agent Marketplace. Discover and pay AI agents for image generation, audio, code, and data tasks via QR-code USDC micropayments on Base. No accounts. No wallet connect. Payments go 100% to agents. Powered by x402, ENS, IPFS, and Cloudflare.

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machine-payments

by daimo-eth

Any-to-any machine payments

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evm

by @x402

x402 Payment Protocol EVM Implementation

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x402

by @dexterai

Full-stack x402 SDK - add paid API monetization to any endpoint. Express middleware, React hooks, Access Pass, dynamic pricing. Solana, Base, Polygon, Arbitrum, Optimism, Avalanche, SKALE.

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extensions

by @armory-sh

Armory x402 SDK — Protocol extensions for x402 payments. Add SIWX, payment ID, Bazaar discovery, and custom extensions.

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base

by @armory-sh

Armory x402 SDK — Core protocol types, EIP-712 signing, encoding, network configs, and token registry. 100% compatible with Coinbase x402 SDKs.

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middleware-hono

by @armory-sh

Armory x402 SDK — Payment middleware for Hono. Accept x402 payments from any client in your Hono app. 100% compatible with Coinbase x402 SDKs.

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CloddsBot

by alsk1992

Open Source AI trading agent that operates autonomously across 1000+ markets - Polymarket, Kalshi, Binance, Hyperliquid, Solana DEXs, 5 EVM chains. Scans for edge, executes instantly, manages risk while you sleep. Agent commerce protocol for machine-to-machine payments. Self-hosted. Built on Claude.

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facilitator

by qntx

Production-ready x402 facilitator server.

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r402

by qntx

Rust SDK for the x402 payment protocol.

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routeweiler-python-sdk

by nikoSchoinas

The financial operating system for AI agents. A single HTTP client that intercepts '402 Payment Required', routes across x402, L402, and MPP, persists credentials as recoverable assets, enforces per-envelope budgets, and emits a structured trace.

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x402-deploy

by nirholas

Turn any API or MCP server into a paid service with x402

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Agent-Layer

by lopushok9

A wallet for agents. Make payments via x402, use stablecoins, swap assets, earn yield with defi and buy tokenized stocks across the most popular chains.

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ledgerflow

by longcipher

A chain-agnostic AI-native payment infrastructure, authz layer for x402

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Vault-0

by 0-Vault

Vault-0: Agent Security, Monitor & x402 Wallet for OpenClaw. Encrypted secret vault, real-time agent monitor, policy enforcement, and native x402 payments — built with Rust + Tauri.

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chaingpt-claude-skill

by ChainGPT-org

154 Web3 MCP tools for Claude Code, custody-free. Plus an agent wallet prompt injection can't drain: per-tx, daily, and on-chain (ERC-4337) spending caps the model can't bypass. EVM + Solana + Tron DEX/DeFi, perps, prediction markets, contract deploy + audit.

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Coinbase-x402

by Benjamin-cup

This is demo for Coinbase x402 payment

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erc8004-agents

by Sperax

Create and register ERC-8004 trustless AI agents on any EVM chain — Ethereum, BNB Chain, Base, Arbitrum, Optimism, Polygon, and more. Zero-dependency standalone UI for on-chain agent identity registration, reputation, and validation. Mint ERC-721 NFT agent identities with metadata, service endpoints, A2A/MCP discovery, and x402 payment support.

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mono

by txkit

Safe bridge between AI agents and Web3 transactions. Open-source React kit + protocol with anti-phishing UI patterns built in.

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x402-sandbox

by bus402

One-command local development environment for HTTP 402 Payment Required protocol with blockchain payments (EIP-3009 USDC)

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mainnet-x402-facilitator

by primev

Gas-sponsored USDC transfers on Ethereum mainnet via ERC-20 permit signatures

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facilitator

by melonask

Self-hosted x402 payment facilitator server — verifies and settles any ERC-20 token via EIP-7702

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agentstore

by techgangboss

Open-source marketplace for Claude Code plugins. Publish in 2 HTTP requests, earn 80% in USDC. Install: /plugin marketplace add techgangboss/agentstore

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x402-contracts

by springmint

Permit402 smart contract for the x402 payment protocol — gasless ERC20 payment authorization on EVM and TRON

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agentwallet-mcp

by hifriendbot

Permissionless wallet infrastructure for AI agents. Create wallets, sign transactions, and broadcast on EVM + Solana. Pay and accept x402 payments. Built-in guards. No KYC. Up to 50% less expensive than Coinbase.