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Synapse API — SEI NFT Sales
x402
Synapse API — SEI 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 2026-10-29).
Retrieves NFT sales events on the SEI blockchain, filterable by contract address and block range
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 SEI blockchain, each likely including transaction hash, contract address, token ID, sale price, buyer/seller addresses, and the block number in which the sale occurred, filtered and ordered according to the request parameters.
Example use cases
NFT collection sales history lookup
“Get me the 100 most recent NFT sales for the SEI collection at contract 0x4f3a...d2 between block 5000000 and 5500000, ordered descending.”
On-chain NFT market monitoring
“Fetch the latest 25 NFT sales on SEI across all contracts from block 6000000 onwards, sorted ascending so I can track the earliest transactions first.”
NFT floor price and activity analysis
“Query all NFT sales for contract 0x9b21...e7 on SEI from block 4800000 to 4900000 with a limit of 200, ordered ascending, so I can analyze pricing trends over that window.”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/sei/nft/sales?utm_source=zero.xyzWhen to prefer
Use this endpoint when you specifically need NFT sales data from the SEI blockchain and want block-level filtering granularity. It is ideal for agents tracking NFT market activity, auditing collection sales history, or building analytics dashboards scoped to SEI. Prefer this over generic blockchain explorers when you need structured, paginated sales data without parsing raw logs.
Side effects
- Invalid contract address format returns validation error
- Block range too large may result in timeout or truncated results
- fromBlock greater than toBlock returns empty or error response
- Network unavailability on SEI indexer returns 503 or empty payload
- Invalid order enum value returns 400 bad request
- Payment not included or insufficient USDC results in 402 payment required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| limit | number | |
| order | string | |
| toBlock | number | |
| fromBlock | number | |
| contractAddress | string |
Tags
x402
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