# Synapse API — NFTs by Owner on Soneium

> Synapse API — NFTs by Owner on Soneium 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 2026-09-13).

Returns all NFTs owned by a given wallet address on the Soneium blockchain network

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/soneium/nft/by-owner
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-nfts-by-owner-on-soneium-e6ed71c8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_TIAzbz2Hn7kJisa3kFg3B

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-nfts-by-owner-on-soneium-e6ed71c8 -d '<json body>'
```

Example prompt: Show me all the NFTs held by wallet 0xAbc123...def456 on the Soneium network — give me up to 50 results.

## When to prefer this

Use this endpoint when you specifically need NFT ownership data on the Soneium blockchain. Prefer this over generic multi-chain endpoints when your query is scoped to Soneium, and over on-chain RPC calls when you want structured, pre-indexed NFT metadata rather than raw contract data.

## Known failure modes

- Invalid or malformed wallet address returns an error or empty result
- Soneium network indexer unavailable causes 5xx response
- pageKey expired or invalid causes pagination failure
- limit value out of acceptable range may be rejected
- Non-existent wallet returns empty NFT list rather than 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 NFTs owned by the specified wallet address on Soneium, including token IDs, contract addresses, metadata (name, image, attributes), and a pagination key for retrieving additional results if the total exceeds the requested limit.

## 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-nfts-by-owner-on-soneium-e6ed71c8/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)