# Synapse API — Polygon NFT by Owner

> Synapse API — Polygon NFT by Owner 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).

Returns a paginated list of NFTs owned by a specified wallet address on the Polygon blockchain

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/polygon/nft/by-owner
- 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-polygon-nft-by-owner-995e20fd
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_a3yYLlOo6d35FCFbMIZXJ

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-by-owner-995e20fd -d '<json body>'
```

Example prompt: Can you pull up all the NFTs owned by the Polygon wallet 0x742d35Cc6634C0532925a3b8D4C9D9f4F5e3e1b2? Fetch up to 50 results.

## When to prefer this

Use this endpoint when you need to enumerate all NFTs owned by a specific address on the Polygon (MATIC) network specifically. Prefer this over Ethereum NFT endpoints when the user's wallet activity or NFT collection is on Polygon. Useful for portfolio displays, ownership verification, and NFT gating scenarios on Polygon.

## Known failure modes

- Invalid or malformed wallet address returns a 400 error
- Wallet with no Polygon NFTs returns an empty list
- Invalid pageKey causes a pagination error or empty result
- Rate limiting or payment failure returns a 402 or 429 response
- Polygon network indexer downtime causes 503 or timeout errors

## 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 NFTs owned by the specified wallet address on the Polygon network, including token metadata (contract address, token ID, name, image, etc.) and a pagination key for fetching subsequent pages.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "limit": {
   "type": "number"
  },
  "owner": {
   "type": "string"
  },
  "pageKey": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synapse-api-polygon-nft-by-owner-995e20fd/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)