{"uid":"cap_nE_5fehis9xSBsTut7w7N","slug":"base-eip-1559-transaction-decode-41401069","name":"Base EIP-1559 Transaction Decode","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/base_eip1559_transaction_decode/invoke","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"request_json":{"type":"string","maxLength":65536,"minLength":2}}},"responseSchema":{"type":"json","example":{"replay":false,"result":{"warnings":["Unsigned or supplied transaction data does not prove broadcast or inclusion."],"service_id":"base_eip1559_transaction_decode","analysis_json":"{\"calldata_bytes\":68,\"chain_id\":\"8453\",\"data\":\"0xa9059cbb00000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000064\",\"gas_limit\":\"21000\",\"max_fee_per_gas\":\"120\",\"max_priority_fee_per_gas\":\"5\",\"network\":\"base_mainnet\",\"network_context\":{\"accepted_chain_ids\":[\"8453\",\"84532\"],\"deposit_transaction_type\":\"0x7e\",\"fee_model\":\"L2 execution plus caller-supplied L1 data/operator components\",\"protocol_family\":\"OP Stack\"},\"nonce\":\"1\",\"to\":\"0x0000000000000000000000000000000000000002\",\"type\":\"0x2\",\"value\":\"0\"}","evidence_scope":"caller_supplied_data","analyzed_network":"base"},"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":"base_eip1559_transaction_decode","executionId":"example-execution","startedAtMs":0,"amountAtomic":"10000","resultSha256":"b8f008e1ad2ebd54e69aeb7548fe98c69fb72d2571835fedd48ef59f441e3b30","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_bhJaM0LyfXpvyqdkuFCuM","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":"Decodes and analyzes a Base network EIP-1559 (type 0x2) transaction, extracting fields like chain ID, gas parameters, calldata, and network context.","exampleAgentPrompt":"Can you decode this Base EIP-1559 transaction JSON for me and tell me the gas limit, max fee per gas, calldata size, recipient address, and any warnings about it?","exampleUseCases":[{"title":"Inspect unsigned transaction before signing","prompt":"I have an unsigned EIP-1559 transaction JSON that I'm about to sign and send on Base mainnet — can you decode it and tell me the recipient, value, gas limit, and max fee so I can verify it looks right?"},{"title":"Analyze DeFi calldata on Base","prompt":"Here's a raw Base network transaction JSON — can you decode it and break down the calldata bytes, the contract being called, and the gas parameters so I can understand what it's doing?"},{"title":"Debug failed or suspicious transaction","prompt":"I've got a Base EIP-1559 transaction JSON that I think might have wrong gas settings or be targeting the wrong address — can you decode it and flag any warnings or issues you find?"}],"resultDescription":"Returns a JSON object containing decoded transaction fields (chain_id, to address, value, nonce, gas_limit, max_fee_per_gas, max_priority_fee_per_gas, data/calldata, calldata_bytes, type), the analyzed network (base_mainnet), network context (OP Stack protocol family, accepted chain IDs, fee model), evidence scope, warnings (e.g. unsigned data caveat), and a full receipt with service metadata and a result SHA-256 hash.","failureModes":["Invalid or malformed transaction JSON returns a parsing error","Transaction data not conforming to EIP-1559 type 0x2 structure may return partial or empty fields","Chain ID not matching Base (8453 or 84532) may yield a network mismatch warning","Oversized input exceeding 65536 characters will be rejected","Unsigned transactions will always include a warning that broadcast/inclusion is not proven"],"whenToPreferThis":"Choose this endpoint when you need to decode and inspect a Base network EIP-1559 (type 0x2) transaction before signing or broadcasting it, or to audit its fields programmatically. Ideal for agents working in the Base/OP Stack ecosystem that need structured extraction of gas parameters, calldata, and network context without connecting to a node. Prefer it over general-purpose Ethereum decoders when you specifically need Base mainnet network context and OP Stack fee model metadata.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-13T07:02:43.475Z","isFirstParty":false}