# ChainVerdict ERC-20 Supply Lookup

> ChainVerdict ERC-20 Supply Lookup is a paid API for AI agents from chainverdict.xyz, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-14).

Returns total and circulating supply for an ERC-20 token on Base, with decimals applied and block height included, read live from chain.

## Facts

- Endpoint: GET https://chainverdict.xyz/v1/data/supply/:addr
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/chainverdict-erc-20-supply-lookup-ebfe3491
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_TeRbdM0g61FSqxqrvK58b

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 chainverdict-erc-20-supply-lookup-ebfe3491
```

Example prompt: What's the total and circulating supply of the ERC-20 token at contract address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base, with decimals applied?

## When to prefer this

Use this endpoint when you need live, decimal-adjusted ERC-20 token supply data specifically on the Base network with a specific block height reference for auditability. Prefer it over generic block explorer scraping for reliable structured output, or when building agents that need to verify token economics programmatically.

## Known failure modes

- Invalid or non-ERC-20 contract address returns an error or zero values
- Contract address does not exist on Base (wrong chain or mistyped address)
- RPC node transient failure causing a read error
- Token with non-standard decimal implementation may return unexpected precision

## How this service works

Total and circulating supply for an ERC-20 on Base, read live from chain with decimals applied and the block height returned.

## Output

Returns the total supply and circulating supply of the specified ERC-20 token on Base, with token decimals already applied so values are human-readable, along with the block number at which the data was read from the 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"
    },
    "pathParams": {
     "type": "object",
     "required": [
      "addr"
     ],
     "properties": {
      "addr": {
       "type": "string",
       "description": "ERC-20 contract address on Base"
      }
     }
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "additionalProperties": true
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/chainverdict-erc-20-supply-lookup-ebfe3491/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from chainverdict.xyz](https://www.zero.xyz/host/chainverdict.xyz/llms.txt)