# Synapse API — Avalanche NFT Sales

> Synapse API — Avalanche 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 2026-10-17).

Retrieves NFT sales transaction data on the Avalanche blockchain, filterable by contract address and block range.

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/avalanche/nft/sales?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-17
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-avalanche-nft-sales-f24dc37f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_CMbJqvWwW2Vj0nwfuQu2q

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-avalanche-nft-sales-f24dc37f -d '<json body>'
```

Example prompt: Pull the last 50 NFT sales on Avalanche for the contract address 0xAbCd...1234, sorted in descending order, covering blocks 35000000 to 36000000.

## When to prefer this

Use this endpoint when you specifically need NFT sales data on the Avalanche (AVAX) blockchain. It is well-suited for querying historical sales activity for a specific NFT contract or across a defined block range. Prefer this over generic blockchain explorers when you need programmatic, filterable, pay-per-call access without committing to a subscription.

## Known failure modes

- Invalid contract address format returns a validation error
- Block range too large may result in timeout or truncated results
- fromBlock greater than toBlock causes query error
- No sales in the specified block range returns an empty result set
- Invalid order enum value (not 'asc' or 'desc') causes a 400 error

## 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 on the Avalanche network matching the specified filters, including sale transaction details, block numbers, contract addresses, and related metadata. Results are paginated up to the specified limit and ordered as requested.

## 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-avalanche-nft-sales-f24dc37f/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)