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Every five minutes, Mecone turns each of its eight official indices into a cryptographically signed official round: an immutable, chain-independent record you can verify offline with nothing but one pinned public value. This is the transport-neutral layer underneath every delivery rail — the API below, venue-native adapters, and on-chain feeds all carry the same signed round; none of them can create or alter one.
Two environments, one root of trust. production is the settle-grade chain; staging is for evaluation — do not settle real value against staging rounds. Both verify against the same pinned root anchor below; the environments are cryptographically separated by the signing domain.
The staging environment runs the same pipeline for pre-release feeds and partner onboarding (new indices graduate there first, production after review — mirroring the exchange’s live/soon split). Every staging endpoint except /v1/health requires the access token.

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Access tiers (production)

A fresh-rounds read without a token (or with a revoked one) answers 401. A token may additionally be scoped to specific feeds at mint time (the per-feed trial shape): a scoped token reading a fresh round outside its list answers 403 feed not licensed. The scope gates freshness only — the delayed tier stays open to every token. Every token read is metered per token per day; partners see their usage in the partner agreement reporting. Verification never requires a token — the anchor, keysets, registry and verifier kit stay open so a served round can always be checked without trusting the service.

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The trust model — pin one address

The only thing you must obtain out-of-band is the root anchor address:
Everything else is served by the API and proven against that anchor: the root key attests the online keyset, the keyset authorizes the round signer, and the round id is the EIP-712 digest of the signed body (domain = name + version + salt, deliberately no chainId — the same round verifies anywhere). Signatures are canonical low-s secp256k1, one per round.

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Verify a live round in one minute

The kit is ~250 lines with no Mecone dependency — read it, fork it, or reimplement it from the served material; nothing about verification requires trusting this service.

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Endpoints

Symbols: MGDP MCPI MUNEMP MOAI MANTH MH100 MH200 MB200. MKRKN was withdrawn on 27 July 2026: no new rounds are produced, and the public index API excludes it (index-not-found there). This service retains its final signed round, frozen at the withdrawal moment, for audit.

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What a round commits to

The signed body binds, among 25 fields: the feed identity (keccak256("mecone:official-feed:<SYM>:v1") — venue tickers are never identities), the exact int256 value at 18 decimals in natural units (no billions scaling on this rail), six timestamps (effectiveAt, sourceCutoff, sourceAsOf, computedAt, signedAt, validUntil — staleness is validUntilNs, nothing else), the methodology + registry + source-policy hashes, the input-snapshot digest, the previous round digest (per-feed hash chain), and the authorizing keyset id. Corrections never overwrite: a correction is a new signed round that names what it supersedes.

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Integrating

Poll rounds/latest (a round is fresh until its validUntilNs), or mirror the verification into your own stack from the served material. For a settlement integration, contact us — production keys, SLAs, and the correction-policy paperwork live in the partner agreement.