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Synapse API — SEI Transaction History
x402
Synapse API — SEI 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 2026-09-14).
Retrieves paginated transaction history for addresses on the SEI 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 the SEI blockchain matching the specified filters, including transfer categories, block numbers, sender/receiver addresses, and optionally full transaction metadata. A pageKey is returned when more results exist for subsequent requests.
Example use cases
Audit wallet activity on SEI
“Show me all transactions from SEI address sei1abc...xyz over the last 10,000 blocks, ordered from newest to oldest, with full metadata included.”
Track incoming token transfers
“Get me the most recent 50 incoming transactions to my SEI wallet at 0xDef456..., filtering to only token transfers and excluding zero-value ones.”
Paginate through large SEI tx history
“I need to page through the full transaction history for SEI address sei1abc...xyz — start from the beginning in ascending order, 100 transactions at a time, and give me the page key so I can continue.”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/sei/tx/historyWhen to prefer
Use this endpoint when you need on-chain transaction history specifically for the SEI blockchain network, with support for address filtering, block range scoping, category filtering, and pagination. Prefer this over generic blockchain explorers when you need programmatic, pay-per-call access without API key registration, or when building automated SEI wallet monitoring or auditing workflows.
Side effects
- Invalid address format returns a 400 or empty result
- Invalid block range (fromBlock > toBlock) may return an error or empty list
- Unknown category values may be silently ignored or cause a 400
- Payment not received (402) if x402 payment header is missing or insufficient
- Rate limiting or timeout if maxCount is very large
- pageKey expiry if too much time passes between paginated calls
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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