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Synapse API — Plasma Transaction History
x402
Synapse API — Plasma 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 historical transactions for a blockchain address across 57+ networks using Alchemy's asset transfer API
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 paginated list of asset transfer records including transaction hashes, block numbers, from/to addresses, token amounts, contract addresses, asset categories, and optionally token metadata. A pageKey is included for fetching subsequent pages.
Example use cases
DeFi portfolio transaction audit
“Show me all ERC-20 and ETH transfers sent to my wallet 0xABCD...1234 from block 18000000 to 19000000, sorted ascending, including metadata — I want to audit my DeFi activity over that period.”
NFT transfer history tracking
“Get the complete history of NFT transfers out of wallet 0xDEAD...BEEF, paginated in batches of 100, and skip any zero-value transfers — I need to track every NFT I've ever sold.”
Fraud investigation between two addresses
“Fetch all transactions between address 0xSENDER...1 and 0xRECEIVER...2 in descending order from the most recent block, so I can investigate whether there's been suspicious movement between these two wallets.”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/plasma/tx/historyWhen to prefer
Use this endpoint when you need historical on-chain transaction data for a specific wallet or address pair, especially when you need to filter by category (ERC-20, ERC-721, ETH), paginate through large histories, or filter by block range. Prefer this over block explorers when you need structured, machine-readable output for agent processing.
Side effects
- Invalid address format returns a 400 or empty result
- Unknown category string may silently filter all results
- pageKey expiration may cause pagination gaps
- fromBlock/toBlock mismatch or invalid hex values may cause errors
- maxCount exceeding API limits may return truncated results
- Network not supported by underlying Alchemy endpoint returns error
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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