# HealthMetricReading

[All API schemas](/api-reference/schemas/)

<code>object</code> — Additional properties rejected

| Field | Required at this level | Type | Description and constraints |
| --- | --- | --- | --- |
| <code>evidenceId</code> | Yes | <code>string</code> | Pattern: <code>^&#91;a-zA-Z0-9&#93;&#91;a-zA-Z0-9:&#95;-&#93;{2,159}$</code> |
| <code>field</code> | Yes | <code>string</code> | — |
| <code>value</code> | Yes | <code>string</code> | Exact unsigned atomic amount; never coerce to a JavaScript number. Pattern: <code>^&#40;0&#124;&#91;1-9&#93;&#91;0-9&#93;{0,77}&#41;$</code> |
| <code>observedAt</code> | Yes | <code>string</code> | Format: <code>date-time</code> |
| <code>quoteAssetId</code> | Yes | <code>string</code> | Pattern: <code>^&#91;a-zA-Z0-9&#93;&#91;a-zA-Z0-9:&#95;-&#93;{2,159}$</code> |
| <code>quoteDecimals</code> | Yes | <code>integer</code> | Minimum: <code>0</code>; Maximum: <code>255</code> |
| <code>definition</code> | Yes | <code>string</code> | — |

Nested required fields apply when their parent object or matching union branch is present. Named types link to their complete schema.

Exact definition: <code>#/components/schemas/HealthMetricReading</code> in the [OpenAPI contract](/openapi/liquidity-operating-system-v2.openapi.json).