# Blockchain Chain ID Reference Lookup

> Blockchain Chain ID Reference Lookup is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-01).

Returns reference metadata for a blockchain given its chainId: name, native gas token, block explorers, public RPC count, and website.

## Facts

- Endpoint: POST https://api.vextorium.com/info-red-pago?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/blockchain-chain-id-reference-lookup-f7666765
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_K11awMmp12uN96zl-VUb7

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 blockchain-chain-id-reference-lookup-f7666765 -d '<json body>'
```

Example prompt: What's the name, native gas token, and block explorer URL for the blockchain with chain ID 42161?

## When to prefer this

Use this endpoint when an agent needs to resolve a raw EVM chain ID integer into human-readable blockchain metadata (name, token, explorers) for display, routing, or configuration — especially in multi-chain workflows where the chain is only known by its numeric ID. Prefer this over hardcoding chain data, as it pulls live from the open ethereum-lists dataset.

## Known failure modes

- Unknown chain_id returns null or empty fields
- Chain ID not in ethereum-lists results in incomplete data
- Stale data if upstream chainid.network has not updated recently
- Missing chain_id in request body causes validation error

## How this service works

Reference data for a blockchain by its chainId: name, gas/native token, block explorers, number of public RPCs and website. Utility for multi-chain agents. Live from chainid.network (ethereum-lists, open data).

## Output

A JSON object containing the blockchain's full name, abbreviation, native gas token symbol and decimals, list of block explorer URLs, count of public RPCs, official website, testnet boolean flag, and optional notes. Returns null fields where data is unavailable.

## 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",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "required": [
      "chain_id"
     ],
     "properties": {
      "chain_id": {
       "type": "integer",
       "description": "Chain id, e.g. 1 (Ethereum), 8453 (Base), 42161 (Arbitrum)"
      }
     }
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": [
      "object",
      "null"
     ],
     "properties": {
      "web": {
       "type": [
        "string",
        "null"
       ]
      },
      "nota": {
       "type": [
        "string",
        "null"
       ]
      },
      "fuente": {
       "type": [
        "string",
        "null"
       ]
      },
      "nombre": {
       "type": [
        "string",
        "null"
       ]
      },
      "testnet": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "chain_id": {
       "type": [
        "number",
        "null"
       ]
      },
      "moneda_gas": {
       "type": [
        "string",
        "null"
       ]
      },
      "abreviatura": {
       "type": [
        "string",
        "null"
       ]
      },
      "exploradores": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": [
         "null",
         "string"
        ]
       }
      },
      "decimales_gas": {
       "type": [
        "number",
        "null"
       ]
      },
      "num_rpc_publicos": {
       "type": [
        "number",
        "null"
       ]
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/blockchain-chain-id-reference-lookup-f7666765/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.vextorium.com](https://www.zero.xyz/host/api.vextorium.com/llms.txt)