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Verification levels

Every delivered response carries a level. It is the most important field in the product: a declaration of which checks passed, not a promise of exactness.

There are three.

single_source: one source answered and passed the deterministic checks (L1/L2). The response is non-empty, schema-valid, fresh, and internally consistent. No independent source confirmed it.

consensus: two or more independently operating sources agreed within tolerance. Independence between them is tested rather than assumed: sources found to read the same upstream count as one observation, not several, and the honest ceiling of that test is not_refuted, never certainty. Direct on-chain reads reach consensus a different way: two independently run nodes agreeing on the same value at the same block, checked on every call.

anchored: the value is tied to an on-chain reference (for example a Chainlink Data Feed, or a signed oracle read) that does not depend on Metera. This is the strongest level available today and applies to token.price.