# ETH Total Supply

> ETH Total Supply is a paid API for AI agents from www.x402financialdata.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Returns the total circulating supply of ETH on the Ethereum mainnet, sourced from Etherscan's V2 API.

## Facts

- Endpoint: GET https://www.x402financialdata.com/eth-supply
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/eth-total-supply-b7024df2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_NKAwJDEltDt13gsqsuKCR

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 eth-total-supply-b7024df2
```

Example prompt: What's the current total supply of ETH on the Ethereum mainnet? Pull the latest circulating supply figure from Etherscan.

## When to prefer this

Use this endpoint when you need the total ETH circulating supply figure quickly and cheaply ($0.01/call) without building your own Etherscan integration. Ideal for dashboards, market cap calculations, or macro research that needs a single authoritative on-chain number for Ethereum mainnet. Prefer this over scraping Etherscan directly or using a heavier data provider for this narrow, specific metric.

## Known failure modes

- Etherscan V2 API downtime may result in a 503 or timeout
- Unsupported chain parameter (only 'eth' is valid) returns an error
- Payment failure or insufficient USDC balance blocks the call
- Rate limiting may occur under high request frequency

## How this service works

Total ETH supply, from Etherscan's V2 API. Not address-specific. $0.01/call.

## Output

A numeric value representing the total circulating supply of ETH on the Ethereum mainnet, as reported by Etherscan's V2 API. Typically returned as a large integer or decimal figure in ETH units.

## 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"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {
      "chain": {
       "enum": [
        "eth"
       ],
       "type": "string",
       "description": "Which chain to query. Only 'eth' is supported right now."
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/eth-total-supply-b7024df2/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from www.x402financialdata.com](https://www.zero.xyz/host/www.x402financialdata.com/llms.txt)