Proof Of Payment Header Generation And Validation

via “proof-of-payment header generation and validation”

x402 MCP server for AI agent payments. Lets Claude, Cursor, LangChain and CrewAI pay for HTTP 402–gated APIs with USDC micropayments on Base L2. Non-custodial, 0% fee. Unlike Cloudflare Pay-Per-Crawl, works on any host and settles directly on-chain.

Unique: Generates lightweight proof-of-payment headers that APIs can validate without querying the blockchain, reducing latency for payment verification. Uses transaction hash and block number as proof, with optional cryptographic signatures for stronger guarantees.

vs others: Faster than requiring APIs to query blockchain for every payment; more trustworthy than relying on MCP server claims alone if signatures are included.