# Saylor Innovations — NFTs Held in a Collection (ERC-721 Enumerable, Ethereum)

> Saylor Innovations — NFTs Held in a Collection (ERC-721 Enumerable, Ethereum) is a paid API for AI agents from saylorinnovations.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-03).

Returns the list of NFTs held by a specific wallet address within a given ERC-721 Enumerable collection contract on Ethereum mainnet.

## Facts

- Endpoint: GET https://saylorinnovations.com/api/evm/ethereum/nfts/:address/:address2?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-03
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/saylor-innovations-nfts-held-in-a-collection-erc-721-enumerable-b4117d47
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_tU92gBvoZR_vhCBDE1icM

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 saylor-innovations-nfts-held-in-a-collection-erc-721-enumerable-b4117d47
```

Example prompt: Can you check which NFTs wallet 0xAb5801a7D398351b8bE11C439e05C5B3259aeC9B holds in the Bored Ape Yacht Club collection contract 0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D on Ethereum?

## When to prefer this

Use this endpoint when you need to enumerate the specific NFTs held by a wallet within a known ERC-721 Enumerable collection on Ethereum mainnet. Prefer this over generic NFT indexers when you want direct on-chain data for a specific contract/wallet pair, especially for NFT-gating, portfolio auditing, or ownership verification workflows.

## Known failure modes

- Invalid or malformed wallet address returns an error
- Invalid or non-ERC-721-Enumerable contract address returns an error or empty result
- Wallet holds no NFTs in the specified collection — returns empty list
- Contract address is not ERC-721 Enumerable (missing enumeration interface) — may fail or return incomplete data
- Network congestion or RPC node issues may cause timeouts
- Payment not fulfilled — x402 payment required before response is returned

## How this service works

NFTs Held in a Collection (ERC-721 Enumerable) (ethereum). NFTs a wallet holds in a collection (ERC-721 Enumerable): balance and up to 50 token ids. Any of 5 chains.

## Output

Returns on-chain data listing the NFT token IDs (and associated metadata if available) held by the specified wallet address within the given ERC-721 Enumerable collection contract on Ethereum mainnet, reflecting current blockchain state.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/saylor-innovations-nfts-held-in-a-collection-erc-721-enumerable-b4117d47/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from saylorinnovations.com](https://www.zero.xyz/host/saylorinnovations.com/llms.txt)