x402

@melonask

Comprehensive guide for building solutions with the x402-rs Rust library and the x402 HTTP 402 payment protocol. Use this skill whenever the user wants to: create API services that accept x402 payments and return results; build agents that automatically pay via the x402 protocol to access paid data; implement payment verification on their own facilitator; configure x402 facilitators for EVM/Solana/Aptos blockchains; use any ERC-20 token or native coin as payment (not just USDC); build custom payment schemes (like EIP-7702 delegation); implement gasless payments via EIP-3009, Permit2, or EIP-2612; protect Axum routes behind blockchain micropayments; create reqwest clients that transparently handle x402 payments; or work with the x402 protocol V1 or V2 wire formats. Make sure to use this skill when the user mentions HTTP 402, x402, blockchain payments, crypto payments, micropayments over HTTP, pay-per-request APIs, or facilitator setup.