{"uid":"cap_4urrSCZqeIjVVw8pYFZ90","slug":"signalharness-abi-constructor-encode-a62ddf95","name":"SignalHarness ABI Constructor Encode","description":"Explore 330 pay-per-call x402 API services and 27 agent-native digital products, with Base USDC pricing, secure Polar checkout, and free discovery.","url":"https://signalharness.ai/api/agent/services/abi_constructor_encode/invoke","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"abi_constructor_request":{"type":"string","maxLength":65536,"minLength":2}}},"responseSchema":{"type":"json","example":{"replay":false,"result":{"warnings":["Output is unsigned data and is never broadcast."],"service_id":"abi_constructor_encode","evidence_scope":"caller_supplied_data","encoded_deployment_data":"{\"data\":\"0x000000000000000000000000000000000000000000000000000000000000000001\"}"},"status":"succeeded","receipt":{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","usage":[],"status":"succeeded","network":"eip155:8453","artifacts":[],"endedAtMs":0,"latencyMs":0,"paymentId":"example-payment","receiptId":"example-receipt","requestId":"example-request","serviceId":"abi_constructor_encode","executionId":"example-execution","startedAtMs":0,"amountAtomic":"10000","resultSha256":"f13d5dc36871283c02d72af2313985dc961c981d9e12218d6a579e7cf37141e1","serviceVersion":"1.0.0","settlementReference":"0x0000000000000000000000000000000000000000000000000000000000000000"},"artifacts":[],"requestId":"example-request","executionId":"example-execution"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","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":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_TH-zLMODQ4OARZmuo9z7R","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"ABI-encodes constructor arguments for Ethereum smart contract deployment bytecode","exampleAgentPrompt":"ABI-encode the constructor arguments for my ERC20 token contract — the constructor takes a string name 'MyToken', a string symbol 'MTK', and a uint256 initial supply of 1000000000000000000000000, and I need the encoded deployment data to append to my bytecode.","exampleUseCases":[{"title":"ERC20 token deployment encoding","prompt":"I'm deploying an ERC20 token and need the constructor arguments ABI-encoded — the constructor signature is (string name, string symbol, uint256 totalSupply) with values 'GoldToken', 'GLD', and 500000000000000000000000. Can you encode that for me so I can append it to my compiled bytecode?"},{"title":"Proxy contract initializer encoding","prompt":"Help me ABI-encode the constructor args for a UUPS proxy deployment — the constructor takes an address for the implementation at 0xAbCd1234567890abcdef1234567890ABCDEF1234 and a uint256 version of 1. I need the encoded bytes to include in my deployment transaction."},{"title":"CREATE2 deterministic address preparation","prompt":"I want to do a CREATE2 deployment and need to encode the constructor parameters first — the contract constructor takes (address owner, uint256 fee) with owner 0xdeadbeefdeadbeefdeadbeefdeadbeefdeadbeef and fee 250. Can you give me the ABI-encoded constructor data?"}],"resultDescription":"Returns a JSON object containing the ABI-encoded constructor calldata as a hex string in 'encoded_deployment_data', any warnings about the encoding process, the service_id, evidence_scope, and a full payment receipt with request/execution IDs, network (Base/eip155:8453), amount paid, latency, and a SHA-256 hash of the result for verification.","failureModes":["Invalid ABI constructor request JSON causes a parsing error","Mismatched parameter types and values result in encoding failure or warnings","Malformed ABI type strings (e.g. unrecognized Solidity types) cause rejection","Request exceeds 65536 character limit returns validation error","Payment failure via x402 protocol results in no execution","Network or service unavailability returns a failed status in the receipt"],"whenToPreferThis":"Choose this endpoint when you need a hosted, pay-per-call service to ABI-encode Ethereum smart contract constructor arguments without setting up a local ethers.js or viem environment. Particularly useful for AI agents orchestrating contract deployments that lack a local EVM library, or when you need a reliable, receipted, auditable encoding step with a SHA-256 result hash for verification. At $0.01 USDC per call it is cost-effective for single deployments or low-frequency pipelines.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-13T13:02:25.659Z","isFirstParty":false}