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Synapse API — Arbitrum Transaction History
x402
Synapse API — Arbitrum 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 Arbitrum 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 list of transaction records on the Arbitrum network matching the specified filters, including transaction hashes, block numbers, sender/receiver addresses, asset amounts, token metadata (if withMetadata is true), and a pageKey for pagination through large result sets.
Example use cases
Wallet activity audit for DeFi user
“Show me all transactions sent from my Arbitrum wallet 0xDEF456... starting from block 100000000, most recent first, with full metadata included.”
Token transfer history lookup
“Get the ERC-20 token transfer history for address 0x789GHI... on Arbitrum, limiting to 50 results and excluding zero-value transfers.”
Portfolio reconciliation across blocks
“Fetch all incoming and outgoing transactions to Arbitrum address 0xJKL012... between block 95000000 and 100000000 in ascending order so I can reconcile my portfolio.”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/arbitrum/tx/historyWhen to prefer
Use this endpoint when you need on-chain transaction history specifically for the Arbitrum (Layer-2) network with flexible filtering by address, block range, category, and ordering. Prefer this over Ethereum mainnet endpoints when the user's assets or activity are on Arbitrum. Useful for portfolio tracking, auditing, DeFi analytics, or any agent task requiring paginated Arbitrum transaction data at $0.01 per call.
Side effects
- Invalid address format returns an error response
- fromBlock or toBlock out of valid range causes an error
- maxCount exceeding API limits may return partial results or error
- Invalid category values return a validation error
- pageKey mismatch or expiry may cause pagination errors
- Payment failure (x402) if insufficient USDC balance
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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