# Synapse API — Polygon NFT Sales

> 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

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/polygon/nft/sales?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-polygon-nft-sales-9c31ccb4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_eq1DMwXJlSvxjEQ7CjbsF

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability synapse-api-polygon-nft-sales-9c31ccb4 -d '<json body>'
```

Example prompt: Pull the last 50 NFT sales for the Polygon contract 0xA1234...abcd in descending block order, starting from block 45000000 up to block 45100000.

## When to prefer this

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.

## Known failure modes

- 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

## 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.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "limit": {
   "type": "number"
  },
  "order": {
   "enum": [
    "asc",
    "desc"
   ],
   "type": "string"
  },
  "toBlock": {
   "type": "number"
  },
  "fromBlock": {
   "type": "number"
  },
  "contractAddress": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synapse-api-polygon-nft-sales-9c31ccb4/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from synapse-api-brown.vercel.app](https://www.zero.xyz/host/synapse-api-brown.vercel.app/llms.txt)