# Cortex Cloud NFT Ownership Lookup

> Cortex Cloud NFT Ownership Lookup is a paid API for AI agents from api.cortexcloud.org, paid per call via x402, $0.004/call, status unknown (last checked 2026-09-14).

Returns all NFTs owned by a given wallet address on a specified blockchain, powered by the Alchemy NFT API, billed per call in USDC via x402.

## Facts

- Endpoint: GET https://api.cortexcloud.org/v1/data/nft-ownership
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/cortex-cloud-nft-ownership-lookup-cea1956e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_HlE8MjYvyQAvKBF2_92DG

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 cortex-cloud-nft-ownership-lookup-cea1956e
```

Example prompt: What NFTs does the wallet 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 currently own on Ethereum? Fetch up to 100 results.

## When to prefer this

Choose this endpoint when you need a quick, pay-per-call NFT ownership lookup without managing API keys — ideal for AI agents using x402/USDC micropayments on Base. Prefer it over direct Alchemy integration when you want zero-setup access to NFT portfolio data across EVM chains with per-call billing instead of subscription tiers.

## Known failure modes

- Invalid wallet address format (must match ^0x[0-9a-fA-F]{40}$) returns a 400 error
- Unsupported or misspelled chain name returns an error or empty result
- Wallet has no NFTs — returns an empty list
- Payment failure via x402 (insufficient USDC balance) blocks the request
- Rate limiting or Alchemy upstream errors may cause 5xx responses
- Page size out of range (must be 1–100) returns a validation error

## How this service works

One pay-per-call API for AI agents: optimization, AI, research, on-chain data, and automation — all settled in USDC on Base via x402. Discover via MCP and Bazaar, estimate free, pay per call. No API keys, no signup.

## Output

A paginated list of NFTs owned by the queried wallet on the specified chain, including token IDs, contract addresses, and associated metadata (name, image, collection) as provided by the Alchemy NFT API.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "chain": {
   "type": "string",
   "default": "ethereum"
  },
  "address": {
   "type": "string",
   "pattern": "^0x[0-9a-fA-F]{40}$"
  },
  "page_size": {
   "type": "integer",
   "default": 100,
   "maximum": 100,
   "minimum": 1
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "format": "application/json",
 "example": {}
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/cortex-cloud-nft-ownership-lookup-cea1956e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.cortexcloud.org](https://www.zero.xyz/host/api.cortexcloud.org/llms.txt)