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Every five minutes Mecone signs each of its eight public indices into a signed official round — the one source of truth, an immutable record you can verify offline against one pinned public key. The signed round is transport-neutral: every rail below carries that same round, and none of them can create or alter one.

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Choosing your integration path

All paths serve the same eight production indices. Fresh signed rounds are a licensed pull (partner token, metered per read); rounds older than 24 hours and everything verification needs — anchor, keysets, registry, verifier kit — stay open, because the signed round is a portable artifact and verification uses public material only.

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On-chain (EVM venues)

The signing domain omits chainId and verifyingContract, so the same signed round verifies on any chain. At onboarding we deploy the publisher that carries verified signed rounds on-chain at their official effective time and build the consumer contract with you — so the value your contract reads is the signed round itself. Until then, pull rounds over HTTPS from the signed-rounds service.

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Off-chain feed

If you post your own oracle price (an internal oracle, or a HIP-3 style deployer feeding an L1), pull the value from the versioned Mecone API and post it:
value is the index level in its natural unit, with a wire-stable decimal string beside the JSON number; a snapshot is explicitly live_indicative, so settle against rounds/latest or the signed rounds, not against it. The legacy curl https://api.mecone.trade/api/markets/us-gdp (index_now) contract remains unchanged for existing pilots. Full field reference: API.

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Signed official rounds (verifiable)

For settlement, audit, or any integration where you must not trust the transport: every five minutes each index becomes a cryptographically signed official round — the round id is the EIP-712 digest of the signed body, the signer is authorized by a keyset attested by Mecone’s pinned root key, and a self-contained ~250-line verifier is served by the endpoint itself. One public value to pin, three commands to verify a live production round: Signed Official Rounds.