{"uid":"cap_kKvzmq-YODP8cN8ZUZiCV","slug":"abi-function-call-encoder-calldata-generator-1d544ec0","name":"ABI Function Call Encoder (Calldata Generator)","description":"Encode a contract function call (calldata) from its signature and arguments, e.g. transfer(address,uint256) with [to, amount]: selector and hex data ready to sign or simulate.","url":"https://api.vextorium.com/abi-codificar-pago?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"funcion":{"type":"string"},"argumentos":{"type":"array"}}},"responseSchema":{"type":"json","example":{"bytes":68,"funcion":"transfer(address,uint256)","calldata":"0xa9059cbb0000000000000000000000007e5f4552091a69125d5dfcb7b8c2659029395bdf00000000000000000000000000000000000000000000000000000000000f4240","selector":"0xa9059cbb"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.003","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.003/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_CWUzUoNlHU4lWjApxd5o2","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.003","costPer":"request","priority":0,"asset":"EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Encodes a Solidity function signature and its arguments into ABI-encoded calldata (selector + hex data) ready for signing or simulating on-chain.","exampleAgentPrompt":"Encode the calldata for transfer(address,uint256) with arguments [0x7e5f4552091a69125d5dfcb7b8c2659029395bdf, 1000000] so I can sign and submit the transaction.","exampleUseCases":[{"title":"ERC-20 transfer calldata generation","prompt":"Encode calldata for transfer(address,uint256) with recipient 0xAbc123...def and amount 500000 — I need the selector and full hex to build a raw transaction."},{"title":"DeFi protocol interaction encoding","prompt":"Give me the ABI-encoded calldata for approve(address,uint256) with spender 0xUniswapRouter and amount 9999999999 so I can simulate the approval before signing."},{"title":"Smart contract simulation prep","prompt":"I want to simulate a swap on-chain — can you encode swapExactTokensForTokens(uint256,uint256,address[],address,uint256) with arguments [1000, 950, [0xTokenA, 0xTokenB], 0xMyWallet, 1716230400] into calldata?"}],"resultDescription":"Returns a JSON object containing: the canonical function signature string, the 4-byte function selector (e.g. 0xa9059cbb), the full ABI-encoded calldata hex string including selector and encoded arguments, and the total byte length of the calldata.","failureModes":["Invalid or malformed function signature returns an error","Wrong number or type of arguments relative to signature causes encoding failure","Unsupported Solidity types in the signature may not be handled","Malformed Ethereum address argument causes a parsing error","Empty or missing 'funcion' field returns a validation error"],"whenToPreferThis":"Choose this endpoint when you need to quickly generate raw EVM calldata from a function signature string and typed arguments without running a local ethers.js/web3.py library or a full node. Ideal for lightweight agent pipelines that need to prepare transaction data, simulate calls, or pass calldata to a signing service without setting up a local ABI encoding stack.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-16T12:42:28.277Z","isFirstParty":false,"canonicalSlug":"abi-function-call-encoder-calldata-generator-1d544ec0"}