Openrouter Usage

---
name: openrouter-usage
description: Query OpenRouter API costs, credits, and usage breakdown by model, provider, and date for the last 30 days. Triggers on API spending, check costs, openrouter usage, how much have I spent.
---

# OpenRouter Usage

Query OpenRouter API costs and generate usage reports via the command line.

## When to Use

- Checking OpenRouter spend over the last 30 days
- Breaking down costs by model, provider, or date
- Exporting usage data as CSV or JSON for accounting
- Auditing which models and API keys consume the most credits

## Prerequisites

- `OPENROUTER_API_KEY` environment variable (or in a project `.env` file)
- The key **must be a Management key** — create one at https://openrouter.ai/settings/management-keys
- Regular provisioning keys return 401/403 on analytics endpoints

## Usage

```bash
# Full 30-day summary with credits balance
python3 ~/.claude/skills/openrouter-usage/scripts/openrouter_usage.py

# Filter to a single date
python3 ~/.claude/skills/openrouter-usage/scripts/openrouter_usage.py --date 2026-02-01

# Export as CSV (for spreadsheets)
python3 ~/.claude/skills/openrouter-usage/scripts/openrouter_usage.py --csv

# Raw JSON output (for piping to jq)
python3 ~/.claude/skills/openrouter-usage/scripts/openrouter_usage.py --json

# Skip credits lookup (activity only)
python3 ~/.claude/skills/openrouter-usage/scripts/openrouter_usage.py --no-credits
```

## Output

The default report includes:
- **Credits balance**: total purchased, used, remaining
- **Spend by model**: per-model cost with token counts (prompt, completion, reasoning)
- **Spend by provider**: aggregated by provider (OpenAI, Anthropic, Google, etc.)
- **Spend by date**: daily spend with visual bar chart

## API Endpoints

Both endpoints are read-only GETs authenticated via Bearer token:

| Endpoint | Purpose |
|----------|---------|
| `GET /api/v1/credits` | Total credits purchased and used |
| `GET /api/v1/activity` | Last 30 days of usage grouped by model/endpoint/provider |

The activity endpoint returns per-row: `date`, `model`, `provider_name`, `usage`, `byok_usage_inference`, `requests`, `prompt_tokens`, `completion_tokens`, `reasoning_tokens`.