# Blockscout NFT Token Instance Holders

> Blockscout NFT Token Instance Holders is a paid API for AI agents from api.blockscout.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-10).

Returns the list of addresses holding a specific NFT token instance (by token ID) for a given contract on a specified blockchain network

## Facts

- Endpoint: GET https://api.blockscout.com/%7Bchain_id%7D/api/v2/tokens/%7Baddress_hash_param%7D/instances/%7Btoken_id_param%7D/holders
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/blockscout-nft-token-instance-holders-a64886d5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8Ch1WPyawo7tgC9L3B3F-

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 blockscout-nft-token-instance-holders-a64886d5
```

Example prompt: Using Blockscout, show me all the addresses holding token ID 42 of the NFT contract 0xBC4CA0EdA7647A8aB7C2061c2E118A18a936f13D on Ethereum (chain ID 1).

## When to prefer this

Use this endpoint when you need to identify all holders of a specific NFT token instance (by token ID) on a particular chain — especially when you need rich metadata per holder (ENS name, reputation, tags, proxy info). Prefer this over generic token holder endpoints when the token is an NFT (ERC-721 or ERC-1155) and you need instance-level granularity rather than balance-level data across all holders of a fungible token.

## Known failure modes

- Invalid chain_id returns 404 or error — must use a supported Blockscout chain identifier
- Invalid or non-existent token contract address returns empty result or 404
- Non-existent token_id_param returns empty items array
- Fungible token contract address used instead of NFT contract may return unexpected results
- Rate limiting or payment failure returns 402 Payment Required
- Pagination cursor mismatch may return duplicate or skipped results

## How this service works

Explore crypto activities with Blockscout's multichain search. Find transactions, addresses, tokens, and dapps across top blockchain networks — your go-to explorer for cross-chain blockchain data

## Output

A paginated list of holder records, each containing the holder's address hash, optional name, ENS domain, reputation score, proxy type, public/private tags, watchlist names, contract verification status, scam flag, and the specific token ID held. Also includes next_page_params for pagination.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object",
     "properties": {
      "chain_id": {
       "type": "string"
      },
      "token_id_param": {
       "type": "string"
      },
      "address_hash_param": {
       "type": "string"
      }
     }
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "value": {
       "type": "string"
      },
      "token_id": {
       "type": "string"
      },
      "items_count": {
       "type": "integer"
      },
      "address_hash": {
       "type": "string"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "items": [
   {
    "value": "string",
    "address": {
     "hash": "string",
     "name": "string",
     "is_scam": true,
     "metadata": {},
     "proxy_type": "string",
     "reputation": "string",
     "is_contract": true,
     "is_verified": true,
     "public_tags": [
      {
       "label": "string",
       "address_hash": "string",
       "display_name": "string"
      }
     ],
     "private_tags": [
      {
       "label": "string",
       "address_hash": "string",
       "display_name": "string"
      }
     ],
     "ens_domain_name": "string",
     "implementations": [
      {
       "name": "string",
       "address_hash": "string"
      }
     ],
     "watchlist_names": [
      {
       "label": "string",
       "display_name": "string"
      }
     ]
    },
    "token_id": "string"
   }
  ],
  "next_page_params": {}
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/blockscout-nft-token-instance-holders-a64886d5/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.blockscout.com](https://www.zero.xyz/host/api.blockscout.com/llms.txt)