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
Protocols & SDKs that accept crypto
The standards and SDKs behind agent payments. Start here if you're building a paid API or an agent that pays.
4 listings. Each shows the payment protocol, networks, tokens, typical price per call and the source we verified it from. Compare them in a table, sorted by listed price →
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
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.
USDCEVM networks
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