# Glassnode Luna Foundation Guard BTC Balance

> Glassnode Luna Foundation Guard BTC Balance 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 in Luna Foundation Guard (LFG) wallet addresses, the reserve backing the TerraUSD (UST) stablecoin.

## Facts

- Endpoint: GET https://x402.glassnode.com/v1/metrics/distribution/balance_luna_foundation_guard
- 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-luna-foundation-guard-btc-balance-f05c6897
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_izyB94cb0aOyqw-kU8v7N

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-luna-foundation-guard-btc-balance-f05c6897
```

Example prompt: Can you pull the Glassnode daily BTC balance data for the Luna Foundation Guard in native BTC units as JSON, so I can see how their reserves changed over time?

## When to prefer this

Use this endpoint when you specifically need on-chain BTC balance data for the Luna Foundation Guard addresses as tracked by Glassnode, particularly for research into the UST/Terra ecosystem collapse, stablecoin reserve analysis, or bitcoin distribution studies. Choose this over generic crypto price endpoints when you need wallet-level institutional holding data.

## Known failure modes

- Missing required 'a' query parameter (asset symbol) returns a 400 error
- Invalid asset symbol (only BTC is supported) returns a 400 or 422 error
- Payment not provided or insufficient USDC returns a 402 Payment Required response
- Invalid format or interval enum values return a 400 error
- Temporary Glassnode data unavailability may return a 503 error

## How this service works

Luna Foundation Guard Balance — Luna Foundation Guard Balance is the amount of BTC held in addresses of the Luna Foundation Guard (LFG), which controlled the bitcoin reserve supporting the TerraUSD (UST) stablecoin. Data by Glassnode.

## Output

An array of time-series data points, each containing a Unix timestamp (t) and the BTC balance value (v) representing the amount of bitcoin held in Luna Foundation Guard addresses at that point in time.

## 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-luna-foundation-guard-btc-balance-f05c6897/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)