Metric.value
The measured value as a number. Probabilities and rates are expressed as a decimal between 0 and 1, not as a percentage. Required on every Metric.
Field facts
- Path
imp.metric.value- Object
- Metric
- Type
- float
- Requirement
- Required
- Added
- OpenRTB 2.5
- Spec section
- 3.2.5
Example
Where the field sits in a payload, with everything else left out:
{
"id": "req-1",
"imp": [
{
"metric": [
{
"value": 0.72
}
]
}
]
}Common mistakes
- Sending 72 for a 72 percent viewability rate instead of 0.72 makes the impression look impossible to a bidder that expects a probability.
- Sending the number as a string, such as "0.72", is a type mismatch for a float field.
Version history
Added in OpenRTB 2.5, and present in the latest snapshot. The table shows how each version's spec text types the field.
| Versions | Type in the spec | Required | Deprecated |
|---|---|---|---|
| 2.5 to 2.6-202606 | float | Yes | No |