# Rubric Protocol Hedera Node Roster Facts

> Rubric Protocol Hedera Node Roster Facts is a paid API for AI agents from rubric-protocol.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).

Returns attested, post-quantum-signed Hedera network node roster data with an ML-DSA-65 attestation ID for tamper-evident provenance.

## Facts

- Endpoint: GET https://rubric-protocol.com/v1/x402/hedera-facts/nodes
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/rubric-protocol-hedera-node-roster-facts-ff9b7d1f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_GWvO3mWm1d1X_CRWUdUX6

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-node-roster-facts-ff9b7d1f
```

Example prompt: Fetch the current Hedera mainnet node roster for me and include the ML-DSA-65 attestation ID so I can prove exactly what nodes I was told about when I made my decision.

## When to prefer this

Choose this endpoint when your agent needs not just the Hedera node roster but also a cryptographically signed, post-quantum attestation proving what it was told — essential for compliance, audit trails, regulatory filings, or any workflow where you must demonstrate the exact network state your agent acted upon. Prefer this over unauthenticated Hedera mirror node queries when tamper-evidence and non-repudiation are required.

## Known failure modes

- Hedera mirror node unavailable — upstream data cannot be fetched, returns 503 or error payload
- Payment not processed — x402 payment verification fails, returns 402
- Attestation signing failure — ML-DSA-65 signing service unavailable, request may fail or return unsigned data
- Stale snapshot — data may be seconds to minutes old depending on Hedera mirror node latency
- Malformed request — non-GET method returns 405

## How this service works

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

## Output

A JSON snapshot of the Hedera mainnet node roster — including node IDs, endpoints, and status — accompanied by an ML-DSA-65 post-quantum attestation ID that serves as a tamper-evident, Hedera-anchored reference proving exactly what node data was served at the moment of the call.

## 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-node-roster-facts-ff9b7d1f/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)