# Toolbelt402 Token Info Lookup

> Toolbelt402 Token Info Lookup is a paid API for AI agents from toolbelt402.catalystdesk.workers.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-12).

Returns on-chain metadata for an ERC-20 token contract address on Base, including symbol, decimals, and heuristic flags like upgradeable proxy detection.

## Facts

- Endpoint: GET https://toolbelt402.catalystdesk.workers.dev/v1/token?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/toolbelt402-token-info-lookup-47d4deb0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8NST0UMnm1lAC7p38K1CI

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 toolbelt402-token-info-lookup-47d4deb0
```

Example prompt: What token is at the contract address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base — give me the symbol, decimals, and any proxy flags.

## When to prefer this

Choose this endpoint when you need lightweight, no-auth ERC-20 token metadata — symbol, decimals, and proxy heuristics — for contracts deployed on Base, and you want pay-per-call pricing via x402 USDC micropayments without managing API keys. Prefer it over general blockchain explorers when you want programmatic, structured JSON output with heuristic contract analysis baked in.

## Known failure modes

- Invalid or non-ERC-20 contract address returns empty or error response
- Address not found on Base network returns null metadata
- Payment failure via x402 protocol results in 402 response before data is returned
- Non-checksummed or malformed address may cause lookup failure

## How this service works

Pay-per-call utility API for AI agents — x402, USDC on Base, no API key.

## Output

Returns a JSON object with the token's symbol (e.g. 'USDC'), decimals (e.g. 6), and an array of heuristic_flags (e.g. ['upgradeable_proxy_eip1967']) describing smart contract patterns detected on-chain.

## 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"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "address": {
       "type": "string"
      }
     }
    }
   }
  },
  "output": {
   "type": "object"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "symbol": "USDC",
  "decimals": 6,
  "heuristic_flags": [
   "upgradeable_proxy_eip1967"
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/toolbelt402-token-info-lookup-47d4deb0/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from toolbelt402.catalystdesk.workers.dev](https://www.zero.xyz/host/toolbelt402.catalystdesk.workers.dev/llms.txt)