# Synapse API — NFTs by Owner on Base

> Synapse API — NFTs by Owner on Base 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 2026-10-11).

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

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/base/nft/by-owner?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-nfts-by-owner-on-base-027e542c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_u4WoRwx-ZMiSjMXKrCf_6

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-base-027e542c -d '<json body>'
```

Example prompt: Show me all NFTs owned by wallet 0x1234...abcd on the Base blockchain, up to 20 results.

## When to prefer this

Use this endpoint when you specifically need NFT holdings data for a wallet on the Base blockchain network. Prefer this over generic multi-chain NFT endpoints when your use case is Base-specific, and over on-chain RPC calls when you want pre-indexed, metadata-enriched NFT data without raw contract interaction.

## Known failure modes

- Invalid or malformed owner address returns an error or empty result
- Owner address with no NFTs returns an empty list
- Invalid pageKey causes pagination failure or error
- Rate limiting or payment failure (x402) blocks the request
- Base network unavailability causes timeout or upstream 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 on the Base blockchain, including token IDs, contract addresses, NFT metadata (name, image, description), and an optional pageKey for fetching the next page of results.

## 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-base-027e542c/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)