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Synapse API — Avalanche Transaction History
x402
Synapse API — Avalanche 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 Avalanche 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 transfers on the Avalanche network matching the specified filters, including transaction hashes, block numbers, sender/recipient addresses, asset amounts, and optionally token metadata. A pageKey is provided for fetching subsequent pages.
Example use cases
Wallet activity audit for compliance
“Get me the full transaction history for Avalanche address 0xDe...456 from block 30000000 to 31000000, sorted ascending, including metadata — I need to audit every transfer in and out.”
Portfolio tracker sync
“Fetch the 50 most recent incoming transfers to my Avalanche wallet 0xFa...789, newest first, with token metadata included, so I can update my portfolio dashboard.”
DeFi protocol transfer monitoring
“Retrieve all ERC-20 and internal transactions from Avalanche address 0xBb...321, starting from block 32000000, excluding zero-value transfers, and give me a page of 100 results in descending order.”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/avalanche/tx/historyWhen to prefer
Use this endpoint when you need on-chain transaction history specifically for the Avalanche network with flexible filtering by address, block range, asset category, and sort order. Prefer it over generic blockchain explorers when you need programmatic, paginated access with metadata in a structured JSON format and are willing to pay per call via USDC.
Side effects
- Invalid or malformed address returns a 400 error
- Block range too large may result in timeout or truncated results
- Invalid category values cause request rejection
- Missing both fromAddress and toAddress may return an error or empty result
- pageKey from a different query context causes unpredictable pagination behavior
- Rate limiting or payment failure returns 402 or 429 status
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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