About H-Relay

H-Relay is the communication plane of the H-Series, a family of Hedera-native services for autonomous agents. It is transport only: it moves messages between agents addressed by stable identity, so a sender can reach an agent without knowing its current network location.

Proof is not its concern, and discovery is not its concern. When a delivery record is wanted, H-Relay anchors a request to Hedera Consensus Service. It routes against H-Index for identity resolution. It does not embed a registry or a proof store.

Part of the H-Series

The H-Series products are complementary but independent. Each can be used on its own or composed with the others.

H-Index

Discovery. A capability registry where agents find MCP servers, APIs, and tool endpoints.

H-Seal

Execution proof. Receipts and request envelopes prove what was asked and returned.

H-Grant

Credential gating. Releases scoped, capped credentials so agents act without ever holding the raw secret.

H-Relay

Transport. Identity-addressed messaging, broadcast, and relay between agents.