{"headline":"HIGH on Base: approve: let Uniswap Permit2 0x0000…8ba3 spend an UNLIMITED amount of USDC (APPROVE_UNLIMITED)","ladder":"$0.02 calldata-decode (this call) -> $0.02 https://agents.avasis.ai/v1/base/tx-precheck -> $0.02 https://agents.avasis.ai/v1/base/address-screen","sample":true,"live":true,"charged":false,"note":"A real decode of approve(Permit2, unlimited) calldata against USDC on Base (the live Sourcify ABI through the FiatTokenProxy and its implementation, the flags) computed by the paid route's code against the latest block, refreshed every 120 s. Your call gets the same keys for your own inputs.","how_to_pay":{"buy":{"base":"https://agents.avasis.ai/v1/base/calldata-decode","ethereum":"https://agents.avasis.ai/v1/eth/calldata-decode"},"price_usd":"0.02","method":"POST JSON {\"chain\":\"base\",\"to\":\"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913\",\"data\":\"0x095ea7b3000000000000000000000000000000000022d473030f116ddee9f6b43ac78ba3ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff\",\"value\":\"0\",\"from\":\"0xf977814e90da44bfa03b6295a0616a897441acec\"} (or GET with the same query params)","payTo":"0x6264191D6dD5427435B5E829077842e130Ef1fc8","network":"base (USDC)","pitch":"This exact decode for YOUR unsigned transaction for $0.02: signature, arguments by name, nested calls, router plan, unlimited approval / permit / delegatecall / no-code flags, LOW / MEDIUM / HIGH. Unpaid GET or POST = free 402 quote."},"rail":"evm-calldata-decode-1","kind":"calldata-decode","chain":"base","chain_id":8453,"block_number":57319840,"block_timestamp":1794654343,"verdict":{"level":"HIGH","summary":"approve: let Uniswap Permit2 0x0000…8ba3 spend an UNLIMITED amount of USDC","flags":[{"code":"APPROVE_UNLIMITED","severity":"high","text":"approve grants Uniswap Permit2 0x0000…8ba3 an UNLIMITED allowance of USDC: it can move every unit you hold now or later; approve the exact amount instead"},{"code":"PROXY_TARGET","severity":"info","text":"0x8335…2913 is a ZeppelinOSProxy proxy; the code that runs is FiatTokenV2_2 at 0x2ce6…d779 (exact_match)"}],"flags_ok":["target has code","target verified on Sourcify (exact_match)","known: USDC (Circle)","decoded with the verified ABI","no ETH value"]},"call":{"selector":"0x095ea7b3","signature":"approve(address,uint256)","name":"approve","kind":"approve","source":"sourcify","confidence":"verified-abi","decoded":true,"args":[{"name":"spender","type":"address","value":"0x000000000022d473030f116ddee9f6b43ac78ba3"},{"name":"value","type":"uint256","value":"115792089237316195423570985008687907853269984665640564039457584007913129639935"}],"trailing_bytes":0,"candidates":[{"signature":"approve(address,uint256)","source":"sourcify","verified":true},{"signature":"approve(address,uint256)","source":"local","verified":true}],"args_by_name":{"spender":"0x000000000022d473030f116ddee9f6b43ac78ba3","value":"115792089237316195423570985008687907853269984665640564039457584007913129639935"}},"target":{"address":"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913","is_contract":true,"label":"USDC (Circle)","known_kind":"token","token":{"symbol":"USDC","decimals":6,"source":"table"},"sourcify":{"available":true,"verified":"exact_match","name":"FiatTokenProxy","proxy":{"is_proxy":true,"type":"ZeppelinOSProxy","implementation":"0x2ce6311ddae708829bc0784c967b7d77d19fd779","implementation_name":"FiatTokenV2_2","implementation_verified":"exact_match"},"abi_functions":60}},"value":{"wei":"0","eth":"0","nonzero":false},"nested":null,"commands":null,"tx":{"from":"0xf977814e90da44bfa03b6295a0616a897441acec","to":"0x833589fcd6edb6e08f4c7c32d4f71b54bda02913","value":"0","data_bytes":68,"selector":"0x095ea7b3"},"reads":{"rpc":"https://base-rpc.publicnode.com","calls":4,"sourcify":"exact_match","sigdb_lookups":0,"elapsed_ms":828},"cache":{"hit":true,"stale":true,"ageMs":12235637,"ttlMs":120000},"also_available":{"ladder":"$0.02 calldata-decode (this call) -> $0.02 https://agents.avasis.ai/v1/base/tx-precheck -> $0.02 https://agents.avasis.ai/v1/base/address-screen","items":[{"what":"Base pre-sign tx precheck: simulate this exact transaction (same to / data / value) before signing: revert, gas USD, transfers, approval exposure, SIGN / CAUTION / BLOCK","price_usd":"0.02","url":"https://agents.avasis.ai/v1/base/tx-precheck","free_sample":"https://agents.avasis.ai/v1/evm/tx-precheck/sample"},{"what":"Base address screen: OFAC SDN + GoPlus labels + chain state of the target contract (CLEAR / CAUTION / BLOCK)","price_usd":"0.02","url":"https://agents.avasis.ai/v1/base/address-screen","free_sample":"https://agents.avasis.ai/v1/evm/address-screen/sample"}],"how":"same x402 flow as this quote (USDC on Base, no account or API key); an unpaid GET on any url is a free quote"}}