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Synapse API — Base NFT Sales
x402
Synapse API — Base 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 2026-10-14).
Retrieves NFT sales transaction history on the Base blockchain, filtered 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 from the Base blockchain matching the specified contract address and block range, ordered as requested, up to the specified limit. Each record typically includes sale transaction details such as block number, buyer/seller addresses, token IDs, and sale amounts.
Example use cases
NFT collection sales volume analysis
“Get me the last 100 NFT sales for the Base contract 0xabc123... sorted newest first so I can analyze how active this collection has been recently.”
Historical NFT trade audit by block range
“Fetch all NFT sales for contract 0xd4307e0acd12cf46fd6cf93bc264f5d5d1598792 on Base between block 10000000 and 10500000 in ascending order — I need the full chronological history.”
NFT floor price trend monitoring
“Give me the 25 most recent sales from the Base NFT contract 0xdef456... in descending order so I can track how the sale prices have changed over time.”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/base/nft/sales?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need on-chain NFT sales data specifically from the Base (Coinbase L2) blockchain, especially when you need block-level filtering or chronological ordering of sales events. Prefer this over generic NFT APIs when you need raw on-chain sales events rather than aggregated marketplace statistics.
Side effects
- Invalid or non-existent contract address returns empty results or an error
- fromBlock greater than toBlock returns no results or validation error
- Limit parameter too large may cause timeout or truncated response
- Network or RPC unavailability on Base chain causes 500 error
- Missing required contractAddress field may return error or unfiltered results
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| limit | number | |
| order | string | |
| toBlock | number | |
| fromBlock | number | |
| contractAddress | string |
Tags
x402
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