# Rubric Protocol – Hedera Treasury Balance (Attested)

> Rubric Protocol – Hedera Treasury Balance (Attested) is a paid API for AI agents from rubric-protocol.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).

Returns the current HBAR treasury balance as an ML-DSA-65 post-quantum-attested, tamper-evident snapshot from the Hedera network.

## Facts

- Endpoint: GET https://rubric-protocol.com/v1/x402/hedera-facts/treasury-balance
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/rubric-protocol-hedera-treasury-balance-attested-93ef8b28
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_tpItIJ0hyO29Sy_BJSxOE

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 rubric-protocol-hedera-treasury-balance-attested-93ef8b28
```

Example prompt: Fetch me the current Hedera treasury balance with its ML-DSA-65 attestation ID so I can include a tamper-evident reference in my audit log.

## When to prefer this

Choose this endpoint when your agent needs a cryptographically provable, post-quantum-attested record of the Hedera treasury balance — particularly for compliance, audit, or accountability workflows where you must prove what data your agent relied on. Prefer it over raw Hedera API calls when tamper-evidence and attestation provenance are required, and over the bundle endpoint when you only need treasury balance without the overhead of fetching all six Hedera facts.

## Known failure modes

- Payment not settled via x402 protocol returns 402 Payment Required
- Hedera network unavailable or lagging causes stale snapshot or timeout
- Invalid or missing x402 payment header returns authentication/payment error
- Rate limiting if too many calls in rapid succession
- Snapshot attestation ID may reference a recently sealed block, introducing slight lag from real-time

## How this service works

Attested Hedera network facts: HBAR exchange rate, gas fees, supply, node roster, throughput, topic state. Each response

## Output

A JSON response containing the current HBAR treasury balance figure as a snapshot from the Hedera network, accompanied by an ML-DSA-65 (post-quantum) attestation ID that cryptographically binds the data to the moment it was served, enabling downstream systems to prove the balance value was not tampered with.

## 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": [
      "fact"
     ],
     "properties": {
      "fact": {
       "type": "string"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "format": {
     "type": "string"
    },
    "example": {}
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/rubric-protocol-hedera-treasury-balance-attested-93ef8b28/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from rubric-protocol.com](https://www.zero.xyz/host/rubric-protocol.com/llms.txt)