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Rubric Protocol – Hedera Topic State (Attested)
x402
Rubric Protocol – Hedera Topic State (Attested) is a paid API for AI agents from rubric-protocol.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Returns the current state of a Hedera Consensus Service (HCS) topic, cryptographically attested with an ML-DSA-65 post-quantum signature anchored on Hedera mainnet.
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 snapshot of the requested Hedera HCS topic's current state, including sequence number, running hash, and any associated topic metadata, paired with an ML-DSA-65 attestation ID that serves as a tamper-evident, post-quantum-signed reference to the served data anchored on Hedera mainnet.
Example use cases
Audit trail for regulated AI decisions
“Before my AI agent posts its decision on-chain, I need to snapshot the current Hedera HCS topic state with a tamper-evident attestation so auditors can later verify what the topic looked like when the decision was made.”
Real-time topic state check for dApp
“My dApp needs to display the current sequence number and running hash for a specific Hedera HCS topic, and it needs a cryptographic attestation ID alongside it so users can independently verify the data wasn't altered.”
Compliance evidence for smart contract trigger
“Before triggering a smart contract that depends on HCS topic state, grab the current attested Hedera topic snapshot including the post-quantum signature so I have provable evidence of the state at the time of execution.”
Technical details
Endpoint
GEThttps://rubric-protocol.com/v1/x402/hedera-facts/topic-stateWhen to prefer
Use this endpoint when you need cryptographically attested, tamper-evident proof of a Hedera HCS topic's current state — especially in compliance, audit, or regulatory contexts where you must later prove what the topic state was at the exact moment an agent acted. Prefer over raw Hedera mirror node queries when post-quantum signature attestation (ML-DSA-65) and Hedera-anchored provenance are required.
Side effects
- Topic ID not found or invalid – returns error indicating unrecognized HCS topic
- Hedera mirror node unavailable – may return stale or error response
- Payment not processed – x402 payment required before data is returned
- Attestation service degraded – signature generation may fail, returning partial or no attestation
- Rate limiting – too many requests in a short window
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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