{"asset":"USDC","authorization_type":"TransferWithAuthorization (EIP-3009)","challenge_ttl_seconds":300,"decimals":6,"default_price":{"amount":"5000","per":"call"},"eip712_domain":{"chainId":8453,"name":"USD Coin","verifyingContract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","version":"2"},"environment":"production","network":{"chain_id":8453,"name":"base"},"notes":"The 402 challenge body is always authoritative for recipient, amount, chain, and nonce. Do not hardcode.","receipt_signing_address":"0x12138883e159622e22abcdac0e1ecc4b5c0a072e","recipient":"0xdcd0fe977640add2dbe62ca0fb30c63f2fd9fdcf","signature_scheme":"EIP-712","token_address":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","x402_version":1}