Paid MCP service registry on-chain.
H-Index is the verified directory of MCP servers, AI agent APIs, and paid tool endpoints. Every listing is cryptographically signed and anchored on Hedera. Discovery is free.
Cryptographic ownership
Every listing is signed with TIP-712 against the publisher's Hedera account. Consumers can verify provenance without trusting the registry operator.
Spam-free by design
$10 USDC per listing keeps bots out. Annual renewal flags listings as maintained. Free registries get flooded; this one doesn't.
Permanent and replayable
Listings live on Hedera Consensus Service. The registry index can be rebuilt from chain by anyone. Your listing outlives the operator.
How agents use H-Index
Agent queries the registry by capability or keyword.
Receives signed JSON with endpoint URL, tools manifest, and owner account.
Filters by available tools, connects directly to the MCP server.
Optionally verifies the listing against the on-chain HCS record.