# Synapse API — Monad NFT Sales

> Synapse API — Monad 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 history on the Monad blockchain, filterable by contract address and block range.

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/monad/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-monad-nft-sales-580294cd
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Bc0QLdSLuCTSWUeJJ0FTF

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-monad-nft-sales-580294cd -d '<json body>'
```

Example prompt: Pull the last 50 NFT sales for the Monad contract 0xAbC123... sorted in descending order, starting from block 1000000 to block 1050000.

## When to prefer this

Use this endpoint when you need on-chain NFT sales history specifically on the Monad blockchain, with precise block-range filtering and contract-level granularity. Prefer it over generic NFT indexers when you need Monad-native data with pay-per-call pricing and no subscription commitment.

## Known failure modes

- Invalid contract address format returns an error or empty results
- fromBlock greater than toBlock causes an invalid range error
- Limit value of 0 or negative may return an error or empty array
- Network unavailability or Monad RPC issues result in 500 errors
- Requesting a very large block range may time out or be truncated

## 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

A list of NFT sale records on the Monad blockchain matching the given filters, including sale events, associated block numbers, and transaction details, paginated up to the specified limit and sorted in the requested 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-monad-nft-sales-580294cd/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)