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Sinaver Idrisov

@sinaver.eth

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Few thoughts after quick look into x402 whitepaper: - can there be optional auth challenge, e.g. in case required payment response depends on user wallet like in 0x swap, and client should sign SIWE like challenge (auto-sign or request the user)? - can call data be included in x402 payment required response? Complete flow: 1. Client sends request to x402 link 2. Server optionally responds with wallet signing challenge: HTTP/1.1 402 Payment Required WWW-Authenticate: Signature realm="x402", challenge="random_nonce" ... 3. Client signs the challenge with user wallet Authorization: Signature address="0xUserAddress", signature="signed_challenge" 4. Server responds with 402 status and json: { amount: "0.10" address: "0x1234...", assetAddress: "0x2345...", // USDC contract network: "base-mainnet" callData: "0x...." } cc: @nemild @jessepollak https://warpcast.com/nemild/0xaca4eeee
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