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Synapse API — Abstract Transaction History
x402
Synapse API — Abstract 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 2026-10-10).
Retrieves paginated transaction history for a given address or address pair across Abstract blockchain using block range and category filters.
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 involving the specified addresses, including transfer categories, block numbers, transaction hashes, and optionally full metadata such as token name, symbol, and decimals. A pageKey is provided when more results are available.
Example use cases
Wallet audit for DeFi activity
“Show me all ERC20 and ERC721 transfers sent from 0xAbc...123 on Abstract between block 1000000 and 1050000, newest first, with full metadata included.”
Monitor incoming payments to a treasury
“Fetch the last 50 incoming transactions to our treasury address 0xDef...456 on Abstract, excluding any zero-value transfers, and include metadata so I can see token details.”
Paginate through historical on-chain records
“Get the next page of transaction history for wallet 0x789...XYZ on Abstract using pageKey 'abc123', returning up to 100 results in ascending block order.”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/abstract/tx/history?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to query historical on-chain transaction data specifically on the Abstract blockchain network, with support for address-pair filtering, block range scoping, category filtering (ERC20, ERC721, internal, etc.), and cursor-based pagination. Prefer it over generic blockchain explorers when you need programmatic, pay-per-call access with structured JSON output suitable for agent workflows.
Side effects
- Invalid address format returns a 400 error
- Unknown or unsupported category strings may return empty results or errors
- fromBlock greater than toBlock yields no results or an error
- Expired or invalid pageKey causes pagination to fail or restart
- Payment not attached results in 402 Payment Required
- Rate limiting or server errors return 500-level responses
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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