{"uid":"cap_lXrWJgpPf_rwpqoRfjga7","slug":"northline-chainkit-transaction-explainer-75e29529","name":"Northline ChainKit Transaction Explainer","description":"x402 pay-per-call onchain API (Base + Arc).","url":"https://northline-chainkit.northline-c86.workers.dev/v1/tx/explain?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","required":["tx"],"properties":{"tx":{"type":"string","pattern":"^0x[0-9a-fA-F]{64}$"},"chain":{"enum":["base","arc"],"type":"string","default":"base"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"fee":{"amount":"0.0000021","symbol":"ETH"},"status":"success","tokenTransfers":[{"amount":"5","symbol":"USDC"}]}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.004","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":"$0.004/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.004","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.004","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_S0XvUsHvk0WRK2UvzIGDp","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.004","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Fetches and explains a blockchain transaction (Base or Arc) by hash, returning status, gas fees, and token transfers in human-readable form","exampleAgentPrompt":"Can you explain what happened in this Base transaction — 0x3a4b5c6d7e8f9a0b1c2d3e4f5a6b7c8d9e0f1a2b3c4d5e6f7a8b9c0d1e2f3a4b — what tokens moved and what was the fee?","exampleUseCases":[{"title":"Verify a USDC payment onchain","prompt":"I just sent USDC to a vendor and got a transaction hash — 0x1a2b3c4d5e6f7a8b9c0d1e2f3a4b5c6d7e8f9a0b1c2d3e4f5a6b7c8d9e0f1a2b — can you confirm the payment went through on Base and tell me how much was transferred?"},{"title":"Audit gas costs for a transaction","prompt":"What was the ETH fee paid for this Base transaction: 0xabcdef1234567890abcdef1234567890abcdef1234567890abcdef1234567890ab? I want to know if we overpaid on gas."},{"title":"Decode an Arc chain transfer","prompt":"Can you decode this Arc chain transaction 0xdeadbeef1234567890deadbeef1234567890deadbeef1234567890deadbeef1234 and tell me what tokens were moved and whether it succeeded?"}],"resultDescription":"Returns a JSON object with transaction status (success/failure), fee details (amount and symbol, e.g. 0.0000021 ETH), and an array of token transfers (each with amount and symbol, e.g. 5 USDC). Provides a human-readable breakdown of what occurred onchain.","failureModes":["Invalid or malformed transaction hash (must be 0x-prefixed 64 hex characters) returns a validation error","Transaction hash not found on the specified chain returns empty or error response","Unsupported chain value (only 'base' and 'arc' are valid) returns an error","Network/RPC timeout if the chain node is unreachable","Payment not processed (x402 payment required, insufficient USDC)"],"whenToPreferThis":"Choose this endpoint when you need a quick, structured explanation of a specific transaction on Base or Arc, particularly when you need token transfer details and fee breakdown without running your own node. Best for agents that need to confirm payment receipt, audit gas costs, or summarize onchain activity for end users on Base or Arc specifically.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-30T07:05:07.419Z","isFirstParty":false,"canonicalSlug":"northline-chainkit-transaction-explainer-75e29529"}