x402 (open standard)
x402.org
Open payment standard built on HTTP 402 for internet-native and agentic payments; hosted as a Linux Foundation project with docs at docs.x402.org.
USDCother EIP-3009 / SPL tokensBaseSolanaother EVM networks
A2A x402 Extension
github.com
Open-source extension that brings x402 crypto payments to the Agent-to-Agent (A2A) protocol so agents can monetize services with on-chain payments.
Crypto payment details
- Payment protocol
- x402 over A2A
- Networks
- EVM networks
- Tokens
- USDC
- Typical price per call
- Varies by product, see provider
- Category
- Protocols & SDKs · compare protocols & sdks
How we verified it
GitHub repo fetched; description quoted. Last checked 2026-10-21.
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More in Protocols & SDKs
Cloudflare Agents x402
developers.cloudflare.com
Cloudflare Agents SDK docs for accepting and making machine-to-machine x402 payments on Cloudflare Workers.
USDCBase
Vercel x402-mcp
vercel.com
Vercel's x402-mcp package integrating x402 payments with Model Context Protocol servers and the Vercel AI SDK, so MCP tools can charge per call.
USDCBase