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Synapse API — Ethereum Transaction History
x402
Synapse API — Ethereum 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 Ethereum addresses, filtered by block range, category, and direction, via pay-per-call x402 billing.
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 Ethereum transactions matching the specified filters, including transfer categories (ETH, ERC-20, ERC-721, etc.), block numbers, sender/receiver addresses, asset values, and optional metadata. Includes a pageKey for fetching subsequent pages.
Example use cases
Wallet activity audit for compliance
“Pull the full transaction history for Ethereum address 0xDe...456 from block 17000000 to the latest block, sorted newest first, with metadata included — I need to review all transfers for a compliance report.”
DeFi portfolio tracker refresh
“Get up to 50 of the most recent Ethereum transactions for my wallet 0xAb...789, including ERC-20 and ETH categories, excluding zero-value transfers, so I can update my portfolio tracker.”
On-chain reconciliation between two addresses
“Retrieve all Ethereum transfers sent from 0xSender...111 to 0xReceiver...222 between blocks 16500000 and 17500000, in ascending order, with full metadata so I can reconcile payments.”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/ethereum/tx/historyWhen to prefer
Choose this endpoint when you need Ethereum-specific historical transaction data with flexible filtering by address, block range, and asset category. It is well-suited for wallet audits, portfolio reconciliation, and on-chain activity analysis where pagination and metadata enrichment matter. Prefer it over generic blockchain explorers when you need programmatic, structured results with pay-per-call economics.
Side effects
- Invalid address format returns a 400 error
- Block range too large may timeout or return partial results
- Unknown category values may cause a 422 validation error
- Exhausted page cursor or invalid pageKey returns empty or error
- Rate limiting or payment failure via x402 returns 402 Payment Required
- No transactions found returns empty array with no 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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