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Synapse API — Optimism Transaction History
x402
Synapse API — Optimism 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 Optimism 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 asset transfer transactions on the Optimism network matching the specified filters, including transaction hashes, block numbers, from/to addresses, asset categories, values, and optionally full transaction metadata. Also returns a pageKey for fetching subsequent pages.
Example use cases
Audit wallet activity on Optimism
“I need to audit all transactions sent from the Optimism address 0x1234...abcd between block 100000 and block 200000 — show me up to 50 results in ascending order and include metadata.”
Monitor incoming transfers to a contract
“Fetch all incoming transfers to my Optimism smart contract at 0xDEAD...BEEF, skip zero-value transfers, and give me the first page of results sorted oldest first.”
Paginate through full transaction history
“I already got the first batch of transactions for the Optimism address 0xAABB...CCDD — use the page key 'abc123xyz' to get the next page of results, up to 100 transactions, descending order.”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/optimism/tx/historyWhen to prefer
Use this endpoint when you need historical transaction data specifically for the Optimism (OP Mainnet) blockchain. Prefer this over generic blockchain explorers when you need programmatic, paginated, and filterable access to address-level transaction history with metadata, and when you are already working within the Synapse API ecosystem for multi-chain queries.
Side effects
- Invalid or missing address formats return a validation error
- Non-existent block range returns empty results or an error
- Invalid category enum values cause a 400 bad request
- Expired or invalid pageKey may return an error or restart pagination
- Rate limiting or payment failure returns a 402 Payment Required
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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