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Synapse API — Unichain Transaction History
x402
Synapse API — Unichain 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 2026-09-15).
Retrieves paginated transaction history for addresses on the Unichain blockchain network
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 transactions on Unichain matching the specified filters, including fields such as transaction hash, block number, asset category, from/to addresses, value transferred, and optional metadata. A pageKey may be returned for fetching subsequent pages.
Example use cases
Wallet activity audit for compliance
“Get me all transactions involving wallet 0xDEF...456 on Unichain from block 1000000 to 2000000, sorted oldest to newest, including metadata — I need to audit its full on-chain history.”
DeFi portfolio transaction feed
“Fetch the 50 most recent incoming transactions to my Unichain address 0x789...ABC, excluding zero-value transfers, and include token metadata so I can see what assets I received.”
Paginated transaction sync for indexer
“Get the next page of Unichain transaction history for address 0x111...222 using page key 'abc-xyz-page-key', up to 25 results, in ascending order so I can continue syncing where I left off.”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/unichain/tx/historyWhen to prefer
Use this endpoint when you need historical transaction data specifically on the Unichain network and want flexible filtering by address direction, block range, asset category, and ordering. Prefer this over generic blockchain explorers when you need programmatic, paginated access with metadata in a pay-per-call model without API key setup.
Side effects
- Invalid address format returns a validation error
- Unsupported category type causes a 400 bad request
- fromBlock greater than toBlock returns empty results or an error
- Invalid pageKey causes pagination failure
- Rate limiting or payment failure via x402 returns 402 Payment Required
- Network or RPC downtime returns 503 or timeout
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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