x402 Foundation
The open-source foundation governing the x402 protocol specification, documentation, and ecosystem coordination.
Using USDC on x402 Foundation
The x402 Foundation is the open-source organization that governs the x402 protocol specification. Co-founded by Coinbase and Cloudflare, the foundation maintains the protocol spec, reference documentation, and coordinates ecosystem development. The foundation's website at x402.org is the canonical source for the protocol specification, implementation guides, and links to all official SDKs. The foundation ensures x402 remains an open standard that any company can implement without licensing fees or restrictions. It supports the protocol across Base, Ethereum, and Solana.
Supported networks
Key features
- Protocol specification
- Open-source governance
- Co-founded by Coinbase and Cloudflare
- Implementation guides
- Multi-chain standard
Other x402
Coinbase x402 SDK
The reference implementation for x402. TypeScript SDK for building clients and servers that handle per-request USDC payments.
SDKthirdweb x402
x402 middleware from thirdweb that integrates with their smart contract and wallet tooling.
SDKx402 Python SDK
Python library for building x402 clients and servers. Ideal for AI agents and data services.
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