Release: Arbitrum One x402 deposits via CDP (checksummed v2 payload)#295
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…ayload Arbitrum One (42161) only settles through Coinbase CDP (x402 v2); PayAI advertises "arbitrum" in /supported but rejects it on verify with invalid_exact_evm_network_mismatch (confirmed on prod). Route Arbitrum One deposits to CDP (Base + everything else stay on PayAI v1) and fix the CDP v2 payload that was being rejected. Root cause of the CDP 400: CDP's v2 validator requires EIP-55 checksummed EVM addresses. We sent lowercase (multisig addresses are stored lowercase; the X-PAYMENT authorization carries lowercase), so the payload failed CDP's oneOf[x402V2PaymentPayload, x402V1PaymentPayload] and surfaced the misleading "x402V1PaymentPayload requires 'scheme'" error. Checksum asset/payTo in the v2 requirements leaf and authorization.from/to in the payment payload via viem getAddress. Casing does not affect the EIP-3009 signature (EIP-712 encodes addresses to the 20-byte value). PayAI v1 path is untouched. Co-Authored-By: Claude Opus 4.8 <[email protected]>
fix(x402): settle Arbitrum One deposits via CDP with checksummed v2 payload
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Promotes the Arbitrum One x402 fix from
develop(staging) tomain(production).Contents
Single feature — settles agentic gasless USDC (x402) deposits on Arbitrum One (42161) via the Coinbase CDP facilitator (#294):
CDP_SUPPORTED_NETWORKS/assertCdpNetworkSupported.asset/payToandauthorization.from/tovia viemgetAddress. Lowercase addresses were failing CDP'soneOfvalidator and surfacing the misleading"x402V1PaymentPayload requires 'scheme'"error. (PayAI does not settle Arbitrum at all — confirmedinvalid_exact_evm_network_mismatchon prod.)CI
developchecks green (ci+test-backendE2E) on #294.0x5e6EC800…with Arbitrum One ETH (was ~0.0015 ETH) — needed for account-creation (Stylus deploy)./verify+/settleaccept the checksummed body end-to-end; it can't be exercised in CI or on staging (testnet, no CDP Arbitrum Sepolia support).🤖 Generated with Claude Code