{"uid":"cap_WXsVlI1khowlvzDq_LRQE","slug":"apex-transaction-explainer-7efcc628","name":"APEX Transaction Explainer","description":"Explain a transaction in plain English (Base, Arc): the function, every token moved, gas in USD. What did this transaction do? Pass ?chain=base|arc&tx=0x... and get one plain sentence plus the parts: who called which function (named from a table of common ones), every token and NFT that moved and between whom, native value, success or failure, and the gas paid in ETH and dollars on Base (ETH priced from the Uniswap v3 pool on chain) or in USDC on Arc, including native USDC that only appears as…","url":"https://apexfaucet.xyz/api/x402/tx-explain?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method","queryParams"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["chain","tx"],"properties":{"tx":{"type":"string","pattern":"^0x[0-9a-fA-F]{64}$","description":"The transaction hash (0x + 64 hex)."},"chain":{"enum":["base","arc"],"type":"string","description":"Which chain: base or arc."}}}}},"output":{"type":"object"}}},"responseSchema":null,"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_btwST_Pqb9CR44xgzs0zJ","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.003","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Explains a blockchain transaction in plain English, including function called, tokens and NFTs moved, gas cost in USD, and success/failure status for Base or Arc chains.","exampleAgentPrompt":"Can you explain what this Base transaction actually did — 0x3a1b2c4d5e6f7a8b9c0d1e2f3a4b5c6d7e8f9a0b1c2d3e4f5a6b7c8d9e0f1a2b — break down which function was called, every token that moved, and how much the gas cost in USD?","exampleUseCases":[{"title":"DeFi trade post-mortem review","prompt":"I just did a swap on Base and want to understand exactly what happened — can you decode transaction 0x4f8a1b2c3d4e5f6a7b8c9d0e1f2a3b4c5d6e7f8a9b0c1d2e3f4a5b6c7d8e9f0a on Base and tell me which tokens moved, between which wallets, and what the gas cost me in dollars?"},{"title":"NFT transfer verification","prompt":"Can you check this Base transaction 0x1a2b3c4d5e6f7a8b9c0d1e2f3a4b5c6d7e8f9a0b1c2d3e4f5a6b7c8d9e0f1a2b and confirm which NFTs were transferred, who sent them, who received them, and whether the transaction succeeded?"},{"title":"Arc chain gas cost audit","prompt":"What did this Arc transaction 0x9f8e7d6c5b4a3928170605040302010f0e0d0c0b0a090807060504030201009f do, and how much did it cost in USDC for gas? I need the full breakdown of every token movement."}],"resultDescription":"Returns a one-sentence plain English summary of what the transaction did, plus structured parts: the function called (named from a known function table), every token and NFT transfer with sender and recipient, the native ETH/USDC value transferred, whether the transaction succeeded or failed, and gas cost in both ETH and USD (priced from Uniswap v3 on Base) or in USDC on Arc.","failureModes":["Invalid or malformed transaction hash returns an error (must be 0x + 64 hex chars)","Transaction hash not found on the specified chain returns not-found error","Unsupported chain value (anything other than 'base' or 'arc') returns validation error","Very recent transactions may not yet be indexed","Missing required query parameters (chain or tx) returns a 400-level error","Payment failure via x402 protocol blocks the call"],"whenToPreferThis":"Choose this endpoint when you need a human-readable, structured breakdown of a specific transaction on Base or Arc — especially when you need gas costs priced in USD (not just ETH), named function decoding, and a complete token/NFT transfer list in a single call. Prefer over raw block explorer APIs when the goal is agent-readable or user-facing explanations rather than raw hex data.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-01T00:46:40.189Z","isFirstParty":false,"canonicalSlug":"apex-transaction-explainer-7efcc628"}