---
title: "Changes to Evaluate an expression for a billable metric"
method: POST
path: "/billable_metrics/evaluate_expression"
---

# Changes to Evaluate an expression for a billable metric

`POST /billable_metrics/evaluate_expression`

> Every recorded change to this operation, newest first.

## Timeline

Changed in 2 of 3 revisions.

- **2026-11-05** `b216574b9612`: 2 info
- **2026-11-03** `5d26657495a3`: 1 info

## Changes

- **2026-11-05** `b216574b9612`: 2 info
  - the request property `event/code` became optional
  - the request property `event/properties` became optional
- **2026-11-03** `5d26657495a3`: 1 info
  - endpoint added

---

[Operation](https://skmtc.dev/getlago/apis/lago-api-documentation/docs/billable_metrics/evaluate_expression/post.md) - [API](https://skmtc.dev/getlago/apis/lago-api-documentation.md) - [Page](https://skmtc.dev/getlago/apis/lago-api-documentation/changes/billable_metrics/evaluate_expression/post)