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Synapse API — Humanity Transaction History
x402
Synapse API — Humanity Transaction History 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 blockchain transaction history for a given address (from/to) filtered by block range, category, and other criteria across supported networks
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
Returns a list of asset transfer records matching the query, each containing sender, receiver, block number, transaction hash, value, asset type, and optionally rich metadata. A nextPageKey is returned for pagination when more results exist.
Example use cases
Audit wallet outgoing transfers
“Show me all outgoing transactions from 0xDeadBeef...1234 in descending order, excluding zero-value transfers, with metadata included — I need to audit what this wallet has sent.”
Paginate through on-chain history
“I need to page through the transaction history for address 0xAbc...789 — start from block 18000000 to block 19000000, ascending order, max 50 results per page.”
Filter transfers by category
“Fetch only ERC20 and ERC721 token transfers received by address 0x111...222, sorted descending, with full metadata, so I can see what tokens were sent to this wallet.”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/humanity/tx/historyWhen to prefer
Use this endpoint when you need to retrieve historical on-chain transaction records for a specific wallet address, optionally filtered by block range or asset category, with support for pagination and metadata. Prefer it over block explorers when you need structured, programmatic access to transfer history for agent workflows or automated analysis.
Side effects
- Invalid address format returns a 400 or error response
- fromBlock/toBlock values out of range or malformed cause query failure
- maxCount exceeding API limits may return an error or be clamped
- pageKey from a different query context causes unexpected results
- Network not supported returns an error
- Payment not received (x402) results in a 402 Payment Required response
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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