{"uid":"cap_cfXaMg3w0cpy7d8Z0rIhC","slug":"signalharness-abi-interface-compare-806e378c","name":"SignalHarness ABI Interface Compare","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_interface_compare/invoke","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"abi_interface_compare_request":{"type":"string","maxLength":65536,"minLength":2}}},"responseSchema":{"type":"json","example":{"replay":false,"result":{"warnings":["Interface similarity does not prove implementation compatibility."],"service_id":"abi_interface_compare","evidence_scope":"caller_supplied_data","abi_interface_comparison":"{\"equal\":true,\"only_left\":[],\"only_right\":[],\"shared\":[\"error:Insufficient(uint256)\",\"event:Changed(address,uint256)\",\"function:balanceOf(address)\"]}"},"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_interface_compare","executionId":"example-execution","startedAtMs":0,"amountAtomic":"10000","resultSha256":"5f2e0958d8952252e24956abbb96ac159fc814b87a33b2cf50215adf083a87f3","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_x2J_MujoImm0B2i_ehU9l","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":"Compares two or more smart contract ABI interfaces to identify differences, incompatibilities, or breaking changes.","exampleAgentPrompt":"Can you compare these two Solidity contract ABIs and tell me if there are any breaking changes or incompatibilities between them? Here's the old ABI: [...] and the new ABI: [...]","exampleUseCases":[{"title":"Pre-upgrade ABI compatibility check","prompt":"I'm about to upgrade my smart contract proxy — can you compare the old ABI with the new one and flag any breaking changes that would break existing callers?"},{"title":"ERC standard compliance check","prompt":"Check whether this custom token contract's ABI is compatible with the standard ERC-20 interface — I need to know if anything is missing or has a different signature."},{"title":"Cross-version interface audit","prompt":"I have two versions of our DeFi protocol's vault contract ABI — can you diff them and list all the functions that were removed, added, or had their signatures changed?"}],"resultDescription":"Returns a structured comparison of the two ABI interfaces, including an 'abi_interface_comparison' narrative result, a list of 'warnings' about incompatibilities or breaking changes, the 'service_id', and an 'evidence_scope' field indicating how the analysis was grounded. Also includes a full receipt with payment and execution metadata.","failureModes":["Malformed or non-JSON ABI input causes parsing failure","Input exceeds 65536 character limit","Ambiguous or incomplete ABI definitions yield low-confidence or incomplete comparison","Invalid ABI format (non-standard structure) may result in warnings or partial analysis","Network or payment settlement failure returns error status"],"whenToPreferThis":"Use this endpoint when you need a structured, automated comparison of two smart contract ABIs to detect breaking changes, missing functions, or signature mismatches — particularly before contract upgrades, when auditing protocol changes, or when verifying that an implementation matches a standard interface like ERC-20 or ERC-721.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-13T12:51:11.723Z","isFirstParty":false}