# Synapse API — ZKSync NFT by Owner

> Synapse API — ZKSync 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).

Retrieves all NFTs owned by a given wallet address on the ZKSync blockchain network

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/zksync/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-zksync-nft-by-owner-461f623c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8_4Lv0-JnKH1zv5p5qSV3

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-zksync-nft-by-owner-461f623c -d '<json body>'
```

Example prompt: Can you fetch up to 50 NFTs owned by the ZKSync wallet address 0x1234abcd...5678 and show me what they hold?

## When to prefer this

Use this endpoint when you need to look up the NFT holdings of a specific wallet address specifically on the ZKSync Layer 2 network. Prefer this over generic Ethereum NFT APIs when the target address is a ZKSync user, or when you need ZKSync-native NFT data. It supports pagination via pageKey, making it suitable for wallets with large NFT collections.

## Known failure modes

- Invalid or malformed owner address returns an error or empty result
- Non-existent or zero-activity wallet returns an empty NFT list
- Invalid pageKey causes pagination failure or duplicate results
- Exceeding rate limits may result in 429 or payment-related errors
- Network unavailability of ZKSync data provider returns 5xx errors
- Missing required owner field returns a validation 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 paginated list of NFTs owned by the specified wallet address on ZKSync, including token IDs, contract addresses, NFT metadata, and a pageKey for fetching 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-zksync-nft-by-owner-461f623c/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)