# Synapse API — SEI NFT Holdings by Owner

> Synapse API — SEI NFT Holdings 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 2026-10-10).

Retrieves all NFTs owned by a given wallet address on the SEI blockchain, with pagination support.

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/sei/nft/by-owner?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-sei-nft-holdings-by-owner-14ea9758
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ZREmXTfxZpcb0U4OXbO9W

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-sei-nft-holdings-by-owner-14ea9758 -d '<json body>'
```

Example prompt: Can you fetch all the NFTs owned by SEI wallet sei1abc123xyz on the SEI blockchain? Limit the results to 20 per page.

## When to prefer this

Use this endpoint when you specifically need to enumerate NFT holdings of a wallet address on the SEI blockchain. Prefer this over generic multi-chain NFT APIs when you know the target chain is SEI and want fast, pay-per-call pricing without subscriptions.

## Known failure modes

- Invalid or malformed wallet address returns an error or empty result
- Non-existent wallet returns empty NFT list
- Invalid pageKey causes pagination failure
- Rate limiting or payment failure (x402) blocks the request
- SEI network downtime or RPC errors cause lookup failure

## 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 the SEI blockchain, including token metadata and ownership details, along with a pagination key for fetching subsequent pages if more results exist.

## 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-sei-nft-holdings-by-owner-14ea9758/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)