# Synapse API — Worldchain NFT Sales

> Synapse API — Worldchain 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 2026-09-15).

Retrieves NFT sales transaction data from the World Chain blockchain, filterable by block range and contract address.

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/worldchain/nft/sales
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-worldchain-nft-sales-04382962
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_OqE1tDiVdzjkig6HrD2Zu

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-worldchain-nft-sales-04382962 -d '<json body>'
```

Example prompt: Pull the last 50 NFT sales on World Chain for contract 0xAbC123... ordered from newest to oldest, covering blocks 1000000 to 1050000.

## When to prefer this

Choose this endpoint when you specifically need NFT sales data from the World Chain (Worldcoin L2) blockchain. It is the right choice for querying on-chain NFT trade events by block range or contract address with pay-per-call pricing, avoiding subscription overhead. Use it over generic blockchain explorers when you need structured, programmatic access to World Chain NFT sales.

## Known failure modes

- Invalid contract address format returns an error
- fromBlock greater than toBlock results in empty or error response
- Block range too large may cause timeouts or truncated results
- Non-existent contract address returns empty sales list
- Invalid order enum value (not 'asc' or 'desc') causes validation error
- Payment failure (insufficient USDC) blocks the request with 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 from the World Chain blockchain, including transaction details such as token IDs, sale prices, buyer/seller addresses, and block numbers, filtered by the specified contract address and block range, up to the requested limit and in the specified sort order.

## 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-worldchain-nft-sales-04382962/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)