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Rubric Protocol – Hedera Anchor Cost Fact
x402
Rubric Protocol – Hedera Anchor Cost Fact 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-denominated cost to anchor a transaction on Hedera, with an ML-DSA-65 post-quantum attestation ID proving the snapshot's integrity.
Price / call$0.001
Success—
StatusUnknown
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 Hedera anchor cost (in HBAR and/or USD), accompanied by an ML-DSA-65 attestation ID that cryptographically binds the returned value to the specific network snapshot served, enabling downstream verification that the data has not been tampered with.
Example use cases
Auditable smart contract fee quoting
“Before I submit this HCS anchoring transaction, pull the current attested Hedera anchor cost so I have a cryptographically signed record of the fee I was quoted at the time of execution.”
Compliance evidence for AI decision logs
“My AI agent just made a financial decision and I need to prove what Hedera anchor costs were at that moment — fetch the Rubric attested anchor-cost snapshot with its attestation ID so I can attach it to my audit trail.”
Real-time anchor fee monitoring dashboard
“Grab the latest post-quantum-signed Hedera anchor cost and attestation ID so I can update my monitoring dashboard with a tamper-evident price reference.”
Technical details
Endpoint
GEThttps://rubric-protocol.com/v1/x402/hedera-facts/anchor-costWhen to prefer
Choose this endpoint when an agent or system needs a cryptographically attested, tamper-evident record of the Hedera network anchor cost — particularly for compliance, audit trails, or any workflow where the agent must later prove what fee data it relied upon. Prefer this over raw Hedera API calls when post-quantum attestation (ML-DSA-65) is required as proof of knowledge at a point in time.
Side effects
- Network or Hedera mainnet connectivity issues preventing fresh snapshot retrieval
- Payment of $0.001 USDC not fulfilled via x402 protocol, resulting in 402 Payment Required
- Stale snapshot if Hedera network data hasn't refreshed recently
- Invalid or missing x402 payment header returns 402 error
- Rate limiting if too many unauthenticated requests are sent
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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