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Synapse API — Arbitrum NFT Sales
x402
Synapse API — Arbitrum NFT Sales 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 2026-10-16).
Retrieves NFT sales events on the Arbitrum blockchain, filterable by block range and contract 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
Returns a list of NFT sale events on the Arbitrum network, each including details such as the token ID, sale price, buyer/seller addresses, and block number, filtered according to the specified contract address and block range parameters.
Example use cases
Track recent NFT sales for a collection
“Get the 100 most recent NFT sales on Arbitrum for the contract 0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D, from block 170000000 to 180000000, sorted newest first.”
Monitor floor price activity over a block window
“Fetch the NFT sales on Arbitrum between block 175000000 and 175500000 for contract 0xAbCd5678... so I can see what prices things sold for during that period.”
Audit historical NFT sales for a smart contract
“Give me all NFT sales on Arbitrum for contract 0xDeF09876 starting from block 160000000 up to block 165000000 in ascending order, limit 200 results.”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/arbitrum/nft/sales?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need on-chain NFT sales data specifically from the Arbitrum network, with the ability to filter by block range and contract address. Prefer it over generic blockchain explorers when you need structured, pay-per-call access without managing your own node infrastructure. Best suited for agents doing real-time or historical NFT market analysis on Arbitrum.
Side effects
- Invalid contract address format returns an error or empty result
- fromBlock greater than toBlock yields no results or an error
- Block range too large may time out or return partial results
- Unrecognized or non-NFT contract address returns empty results
- Missing required fields may cause a 400 bad request
- Payment not attached or insufficient USDC balance returns 402
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| limit | number | |
| order | string | |
| toBlock | number | |
| fromBlock | number | |
| contractAddress | string |
Tags
x402
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