---
title: "Usage summary for a billing period"
method: GET
path: "/v1/usage"
tags: ["keys"]
---

# Usage summary for a billing period

`GET /v1/usage`

## Query parameters

- `period` string — ISO YYYY-MM with a real month 01..12 (defaults to current month).

## Response `200`

Usage summary.

- UsageSummaryResponse
  - `period` string, required
  - `total_requests` integer
  - `total_credits` integer
  - `total_cost_cents` integer
  - `breakdown` object
  - `balance` integer
  - `wallet_balance_cents` integer
  - `wallet_balance_usd` number

## Other responses

- `400` — Invalid request body or parameters.
- `401` — Missing, invalid, or revoked API key. Pass `X-API-Key: sk-coasty-live-...` (or test).
- `403` — API key lacks the required scope or tier-feature is unavailable on the caller's plan.
- `404` — Resource not found in this key's namespace.
- `409` — The resource state conflicts with this operation.
- `413` — The request body exceeds the endpoint limit.
- `422` — The JSON shape is valid but one or more values violate the endpoint contract.
- `429` — Rate or concurrency limit exceeded.
- `500` — Unexpected server error. Retry with exponential backoff.
- `502` — An upstream dependency returned an invalid response.
- `503` — A required service is temporarily unavailable.
- `504` — An upstream dependency timed out.

---

[API](https://skmtc.net/coasty/apis/coasty-public-api.md) · [All operations](https://skmtc.net/coasty/apis/coasty-public-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/coasty/coasty-public-api/versions/f50d93b0d8a1/schema)