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Synapse API — Polygon NFT Sales
x402
Synapse API — Polygon 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 2026-10-12).
Retrieves NFT sales transactions on the Polygon 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 sales events on Polygon matching the query parameters, including transaction details such as sale amounts, token IDs, buyer/seller addresses, and block numbers, up to the specified limit.
Example use cases
NFT collection sales analysis
“Get me the 100 most recent NFT sales for the Polygon contract 0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D between block 50000000 and 51000000, sorted descending, so I can analyze recent trading volume.”
Historical NFT floor price research
“Fetch NFT sales from Polygon contract 0x2953399124F0cBB46d2CbACD8A89cF0599974963 from block 40000000 to 42000000, limit to 25 results in ascending order so I can track price trends over time.”
Monitoring a new NFT drop
“Show me the first 10 sales that happened on Polygon for contract 0xEdB61f74B0d09B2558F1eeb79B247C1F363Ae452 starting at block 52000000 going forward in ascending order — I want to see the earliest transactions right after launch.”
Technical details
Endpoint
POSThttps://synapse-api-brown.vercel.app/api/polygon/nft/sales?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need on-chain NFT sales data specifically on the Polygon network, with flexible block range filtering and pagination. Prefer it over generic block explorers when you want structured, programmatic access to NFT sales events for a specific contract, and when pay-per-call pricing is acceptable over a subscription model.
Side effects
- Invalid contract address format returns an error or empty result
- fromBlock greater than toBlock returns empty or error response
- Limit exceeds maximum allowed value causing rejection
- Block range too wide causing timeout or partial results
- Contract address not found on Polygon returns empty sales array
- Network or RPC connectivity issues cause 5xx errors
- Payment failure or missing x402 credentials returns 402 response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| limit | number | |
| order | string | |
| toBlock | number | |
| fromBlock | number | |
| contractAddress | string |
Tags
x402
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