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Synapse API — Blockchain Transaction History Lookup
x402
Synapse API — Blockchain Transaction History Lookup is a paid API for AI agents from synapse-api-brown.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).
Retrieves paginated historical transactions for a blockchain address across 57+ networks, filtered by block range, category, and address
Price / call$0.01
Success—
StatusUnknown
How this service works
High-speed API suite for AI processing, web scraping, and smart data utilities across 57+ blockchain networks. Pay-per-call via x402.
Output
A paginated list of historical blockchain transactions matching the query filters, optionally including metadata such as token names, contract addresses, and asset values. Results can be ordered ascending or descending by block, scoped by block range, filtered by sender/receiver address and transaction category, and paginated using a pageKey for subsequent requests.
Example use cases
Wallet audit for DeFi activity
“Get me all transactions from wallet 0xDEF...456 between block 18000000 and 18500000, sorted oldest first, including metadata — I want to review their DeFi activity.”
Incoming transfer monitoring for treasury
“Fetch up to 100 incoming transactions to our treasury address 0x789...ABC, newest first, filtering out zero-value transfers so I can reconcile deposits.”
Category-filtered ERC20 transfer history
“Show me all ERC20 token transfers sent from 0x111...222, up to 25 results, with full metadata included — I need to track which tokens were moved.”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/stable/tx/historyWhen to prefer
Use this endpoint when you need historical on-chain transaction data for a specific wallet or address across a wide range of blockchain networks, especially when you need pagination, block-range scoping, or category filtering. Prefer this over generic blockchain explorers when you need machine-readable structured output for agent workflows or when paying per-call via x402 micropayments is acceptable.
Side effects
- Invalid address format returns an error
- Block range out of bounds or non-existent returns empty results
- Invalid category enum value causes request rejection
- Missing required address fields may return unfiltered or empty results
- pageKey expiry causes pagination to restart
- Network timeout on large block ranges
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| order | string | |
| pageKey | string | |
| toBlock | string | |
| category | array | |
| maxCount | number | |
| fromBlock | string | |
| toAddress | string | |
| fromAddress | string | |
| withMetadata | boolean | |
| excludeZeroValue | boolean |
Tags
x402
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