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Synapse API — Base Blockchain Transaction History
x402
Synapse API — Base Blockchain 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 Base blockchain network, with filtering by block range, category, and address.
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
A paginated list of transactions on the Base blockchain matching the specified filters, including transaction hashes, block numbers, from/to addresses, values, and optionally full metadata. A pageKey is returned when more results are available for subsequent calls.
Example use cases
Wallet activity audit for compliance
“Get me all transactions sent from 0xDEADBEEF... on Base between block 12000000 and 13000000, sorted ascending, with full metadata included.”
DeFi portfolio tracker refresh
“Fetch the most recent 50 transactions involving address 0x1234CAFE... on Base — both incoming and outgoing — and include token transfer metadata.”
Suspicious activity investigation
“Show me all non-zero-value ERC20 transfers received by 0xFEED5678... on Base, up to 100 results, sorted from oldest to newest.”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/base/tx/historyWhen to prefer
Choose this endpoint when you need on-chain transaction history specifically for the Base (Coinbase L2) network, with flexible filtering by address, block range, transaction category, and sort order. Prefer it over generic block explorers when you need programmatic, paginated, machine-readable output with metadata for agent workflows or wallet audits.
Side effects
- Invalid or malformed address returns an error
- Block range too large may time out or return partial results
- Invalid category enum value causes a 400 error
- Expired or invalid pageKey breaks pagination
- Rate limiting or payment failure returns 402
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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