---
title: "List call charges"
description: "Trillet OEM API: One row per call charge, newest first."
openapi: /public/openapi/trillet-oem.yaml GET /partner/v1/usage/calls
lastUpdated: "2026-10-28"
---

> **For AI agents:** the complete documentation index is at [llms.txt](https://docs.trillet.ai/llms.txt). Append `.md` to any page URL for its markdown version.

`GET https://api.trillet.ai/partner/v1/usage/calls`

One row per call charge, newest first. Needs `usage:read`.

## Authentication

- `partnerKey` — http bearer (tpk_live_...)

## Query parameters

- `from` (string) — Start, inclusive. Default is the start of the current month (UTC).
- `to` (string) — End, exclusive. Default is now.
- `tenantId` (string) — Only this tenant.
- `limit` (integer)
- `starting_after` (string) — The `id` of the last row on the previous page.

## Response 200

A page of call charges.
  - response (object)
    - `object` (string, required)
    - `data` (array, required)
      - `items` (object)
        - `id` (string)
        - `tenantId` (string)
        - `callId` (string | null) — Trillet's internal call identifier.
        - `callHistoryId` (string | null) — The call history ID. Matches `data.call.id` in call events.
        - `at` (string, date-time)
        - `billedSeconds` (number)
        - `ratePerMinute` (number)
        - `amount` (number) — USD.
    - `hasMore` (boolean, required)

## Response 400

`invalid_request` or `invalid_range`.
  - response (object)
    - `error` (object, required)
      - `type` (string, required, one of: invalid_request_error, authentication_error, permission_error, conflict_error, rate_limit_error, api_error, idempotency_error)
      - `code` (string, required) — A stable code. Handle errors by `code`, not by `message`.
      - `message` (string, required)
      - `param` (string) — The request field the error is about, when there is one.
      - `requestId` (string | null) — Include it when you contact support. Not present on idempotency errors.

## Response 401

The partner key is missing, malformed, unknown or revoked (`partner_key_required`, `invalid_api_key`, `partner_not_enabled`).
  - response (object)
    - `error` (object, required)
      - `type` (string, required, one of: invalid_request_error, authentication_error, permission_error, conflict_error, rate_limit_error, api_error, idempotency_error)
      - `code` (string, required) — A stable code. Handle errors by `code`, not by `message`.
      - `message` (string, required)
      - `param` (string) — The request field the error is about, when there is one.
      - `requestId` (string | null) — Include it when you contact support. Not present on idempotency errors.

## Response 403

`missing_scope`, or `key_restricted` on webhook endpoint routes.
  - response (object)
    - `error` (object, required)
      - `type` (string, required, one of: invalid_request_error, authentication_error, permission_error, conflict_error, rate_limit_error, api_error, idempotency_error)
      - `code` (string, required) — A stable code. Handle errors by `code`, not by `message`.
      - `message` (string, required)
      - `param` (string) — The request field the error is about, when there is one.
      - `requestId` (string | null) — Include it when you contact support. Not present on idempotency errors.

## Response 404

Not found, or not yours. For example `tenant_not_found`.
  - response (object)
    - `error` (object, required)
      - `type` (string, required, one of: invalid_request_error, authentication_error, permission_error, conflict_error, rate_limit_error, api_error, idempotency_error)
      - `code` (string, required) — A stable code. Handle errors by `code`, not by `message`.
      - `message` (string, required)
      - `param` (string) — The request field the error is about, when there is one.
      - `requestId` (string | null) — Include it when you contact support. Not present on idempotency errors.


---

📦 **OpenAPI specs:** Every OpenAPI specification referenced by this documentation is available as a single download — https://docs.trillet.ai/api-specs.zip