# Rubric Protocol Hedera Gas Fees Facts

> Rubric Protocol Hedera Gas Fees 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 Hedera network gas fee data with a post-quantum ML-DSA-65 attestation ID for tamper-evident verification

## Facts

- Endpoint: GET https://rubric-protocol.com/v1/x402/hedera-facts/gas-fees
- 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-gas-fees-facts-6e408cea
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_KHYR1rRCW8uGOAa3ZyhXE

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-gas-fees-facts-6e408cea
```

Example prompt: Fetch the current Hedera gas fees from Rubric Protocol with a post-quantum attestation ID so I have a tamper-evident record of what the fees were when my agent made its decision.

## When to prefer this

Choose this endpoint when an AI agent needs not just the current Hedera gas fee figure but also a cryptographically attested, tamper-evident record proving what that figure was at decision time — essential for compliance, audit trails, or any scenario where the agent's knowledge must later be independently verified. Prefer over raw Hedera mirror node queries when post-quantum attestation and provable data provenance are required.

## Known failure modes

- Payment not received or insufficient USDC — returns 402 Payment Required
- Hedera mirror node temporarily unavailable — returns 503 with error message
- Malformed request method (non-GET) — returns 405 Method Not Allowed
- Rate limit exceeded — returns 429 Too Many Requests
- Attestation signing failure — returns 500 with internal error

## How this service works

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

## Output

A snapshot of current Hedera network gas fee data accompanied by an ML-DSA-65 post-quantum attestation ID that uniquely identifies and cryptographically seals the returned snapshot, allowing any party to later verify what data was served at a given moment.

## 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-gas-fees-facts-6e408cea/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)