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Cortex Cloud NFT Ownership Lookup
x402
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 2026-10-27).
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.
Price / call$0.004
Success—
StatusUnknown
How this service works
NFTs owned by a wallet on a chain (Alchemy NFT API). x402-paid, USDC on Base.
Output
A paginated list of NFTs owned by the queried wallet on the specified chain, including token IDs, contract addresses, and associated metadata (name, image, collection) as provided by the Alchemy NFT API.
Example use cases
NFT portfolio audit for a wallet
“Show me all the NFTs owned by the wallet address 0xAb5801a7D398351b8bE11C439e05C5B3259aeC9B on Ethereum — I want a full list with up to 100 results.”
Gating access by NFT ownership
“Check whether the wallet 0x1234567890abcdef1234567890abcdef12345678 holds any NFTs on Base — I need to verify ownership before granting them access.”
Cross-chain NFT inventory snapshot
“Pull the complete NFT holdings for 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 on Polygon, showing up to 50 items per page.”
Technical details
Endpoint
GEThttps://api.cortexcloud.org/v1/data/nft-ownership?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a quick, pay-per-call NFT ownership lookup without managing API keys — ideal for AI agents using x402/USDC micropayments on Base. Prefer it over direct Alchemy integration when you want zero-setup access to NFT portfolio data across EVM chains with per-call billing instead of subscription tiers.
Side effects
- Invalid wallet address format (must match ^0x[0-9a-fA-F]{40}$) 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"nfts": [
{
"name": "vitalik.wei",
"contract": "",
"token_id": "34454361969670104802583458346517400542074712368450903800518897101070583190115",
"collection": "Wei Name Service"
},
{
"name": "vitalik.cloud",
"contract": "",
"token_id": "73906452355594127029039375271145516945927406532858726769026903911185640775143",
"collection": "Namefi (Ethereum)"
}
],
"chain": "ethereum",
"address": "0xd8da6bf26964af9d7eed9e03e53415d37aa96045",
"currency": "USDC",
"cache_hit": false,
"price_usd": 0.004,
"total_count": 10001
}
}Tags
x402
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