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Rubric Protocol – Attested Hedera HBAR Supply Facts
x402
Rubric Protocol – Attested Hedera HBAR Supply Facts is a paid API for AI agents from rubric-protocol.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-09-15).
Returns cryptographically attested Hedera network supply metrics (HBAR circulating/total supply) anchored to Hedera HCS with a post-quantum signature.
Price / call$0.004
Success—
StatusUnknown
How this service works
Rubric x402 service. Operated by Rubric Protocol.
Output
Returns a structured JSON payload containing current HBAR supply metrics (circulating supply, total supply) along with a post-quantum cryptographic signature and a Hedera Consensus Service (HCS) sequence anchor, providing tamper-evident, independently verifiable proof of the supply fact at time of query.
Example use cases
Compliance report supply verification
“I need a post-quantum signed, HCS-anchored proof of the current HBAR circulating supply for our quarterly compliance filing — can you pull that attested fact from Rubric Protocol?”
DeFi protocol tokenomics snapshot
“Grab me an attested snapshot of Hedera's total and circulating HBAR supply right now, with a verifiable signature, so our smart contract dashboard can display trustworthy supply figures.”
Audit trail for AI treasury agent
“Our AI treasury agent just made an HBAR allocation decision — can you fetch an attested Hedera supply record with an HCS anchor so we have an auditable on-chain fact tied to that moment?”
Technical details
Endpoint
POSThttps://rubric-protocol.com/v1/attested/https://rubric-protocol.com/v1/x402/hedera-facts/supplyWhen to prefer
Choose this endpoint when you need cryptographically attested, independently verifiable Hedera HBAR supply data — not just a raw API response. It is ideal for compliance, audit, and DeFi use cases where tamper-evident proof of the supply figure (backed by post-quantum signatures and HCS anchoring) is required, rather than a plain REST call to a Hedera mirror node.
Side effects
- Hedera mirror node unavailable — returns error indicating upstream data source failure
- Invalid or malformed POST body (missing required 'input' fields) — returns 400-level schema validation error
- Payment not completed or insufficient USDC — returns 402 Payment Required
- HCS anchoring delay — response may be slower than usual if Hedera network is congested
- Post-quantum signing service unavailable — attestation cannot be generated, returns 503
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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