# Glassnode WBTC Balance Metric

> Glassnode WBTC Balance Metric is a paid API for AI agents from x402.glassnode.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-15).

Returns the daily time-series of BTC held by BitGo as backing for Wrapped Bitcoin (WBTC) on Ethereum

## Facts

- Endpoint: GET https://x402.glassnode.com/v1/metrics/distribution/balance_wbtc
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/glassnode-wbtc-balance-metric-8db0c051
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_KkwmteWsDZe5O6zfqhpl0

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 glassnode-wbtc-balance-metric-8db0c051
```

Example prompt: Pull the latest daily Glassnode data on how much BTC BitGo is holding as backing for Wrapped Bitcoin (WBTC), denominated in native BTC.

## When to prefer this

Use this endpoint when you need on-chain data specifically about the BTC collateral held by BitGo backing Wrapped Bitcoin (WBTC), sourced from Glassnode's institutional-grade analytics. Prefer this over generic market data APIs when you need daily historical time-series of WBTC reserve balances rather than price or trading volume. Ideal for DeFi risk analysis, WBTC supply monitoring, or cross-chain BTC tracking.

## Known failure modes

- Missing required 'a=BTC' query parameter returns 400 or validation error
- Invalid enum value for 'c', 'f', or 'i' parameters returns error
- Payment not provided or insufficient USDC results in 402 Payment Required
- Rate limiting or quota exceeded returns 429
- Glassnode data pipeline delay may cause stale or incomplete recent data points

## How this service works

Wrapped BTC (WBTC) Balance — Wrapped BTC (WBTC) Balance is the amount of BTC held by BitGo as backing for Wrapped Bitcoin (WBTC), the first ERC20 token backed 1:1 with Bitcoin and designed to represent Bitcoin on the Ethereum blockchain. Data by Glassnode.

## Output

A JSON array of time-series data points, each containing a Unix timestamp (t) and the corresponding BTC balance (v) held by BitGo as WBTC backing — representing daily 24h interval snapshots of WBTC collateral reserves.

## 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",
     "required": [
      "a"
     ],
     "properties": {
      "a": {
       "enum": [
        "BTC"
       ],
       "type": "string",
       "description": "Asset symbol, e.g. BTC, ETH"
      },
      "c": {
       "enum": [
        "native",
        "usd"
       ],
       "type": "string",
       "description": "Currency for denominated values, e.g. usd, native"
      },
      "f": {
       "enum": [
        "csv",
        "json"
       ],
       "type": "string",
       "description": "Response format: json or csv"
      },
      "i": {
       "enum": [
        "24h"
       ],
       "type": "string",
       "description": "Time interval / resolution, e.g. 24h, 1w, 1month"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "array",
     "items": {
      "type": "object",
      "properties": {
       "t": {
        "type": "number"
       },
       "v": {
        "type": "number"
       }
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/glassnode-wbtc-balance-metric-8db0c051/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.glassnode.com](https://www.zero.xyz/host/x402.glassnode.com/llms.txt)