{"uid":"cap_Aa0z64oK9MXkKjTw4zTv1","slug":"synapse-api-ethereum-transaction-history-8a19d8b1","name":"Synapse API — Ethereum Transaction History","description":"High-speed API suite for AI processing, web scraping, and smart data utilities across 57+ blockchain networks. Pay-per-call via x402.","url":"https://synapse-api-brown.vercel.app/api/ethereum/tx/history","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"order":{"enum":["asc","desc"],"type":"string"},"pageKey":{"type":"string"},"toBlock":{"type":"string"},"category":{"type":"array","items":{"type":"string"}},"maxCount":{"type":"number"},"fromBlock":{"type":"string"},"toAddress":{"type":"string"},"fromAddress":{"type":"string"},"withMetadata":{"type":"boolean"},"excludeZeroValue":{"type":"boolean"}}},"responseSchema":null,"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_ScdH_tmHm060Z2hgM5yE9","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":"Retrieves paginated transaction history for Ethereum addresses, filtered by block range, category, and direction, via pay-per-call x402 billing.","exampleAgentPrompt":"Fetch all Ethereum transaction history for wallet 0xAbC...123 from block 18000000 to 19000000, sorted ascending, including metadata and excluding zero-value transfers, and return up to 100 results.","exampleUseCases":[{"title":"Wallet activity audit for compliance","prompt":"Pull the full transaction history for Ethereum address 0xDe...456 from block 17000000 to the latest block, sorted newest first, with metadata included — I need to review all transfers for a compliance report."},{"title":"DeFi portfolio tracker refresh","prompt":"Get up to 50 of the most recent Ethereum transactions for my wallet 0xAb...789, including ERC-20 and ETH categories, excluding zero-value transfers, so I can update my portfolio tracker."},{"title":"On-chain reconciliation between two addresses","prompt":"Retrieve all Ethereum transfers sent from 0xSender...111 to 0xReceiver...222 between blocks 16500000 and 17500000, in ascending order, with full metadata so I can reconcile payments."}],"resultDescription":"Returns a paginated list of Ethereum transactions matching the specified filters, including transfer categories (ETH, ERC-20, ERC-721, etc.), block numbers, sender/receiver addresses, asset values, and optional metadata. Includes a pageKey for fetching subsequent pages.","failureModes":["Invalid address format returns a 400 error","Block range too large may timeout or return partial results","Unknown category values may cause a 422 validation error","Exhausted page cursor or invalid pageKey returns empty or error","Rate limiting or payment failure via x402 returns 402 Payment Required","No transactions found returns empty array with no error"],"whenToPreferThis":"Choose this endpoint when you need Ethereum-specific historical transaction data with flexible filtering by address, block range, and asset category. It is well-suited for wallet audits, portfolio reconciliation, and on-chain activity analysis where pagination and metadata enrichment matter. Prefer it over generic blockchain explorers when you need programmatic, structured results with pay-per-call economics.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T19:03:58.402Z","isFirstParty":false}