Add OpenRouter provider plugin

[Siddharaj6010]

Provider Name

OpenRouter

Provider Website

https://openrouter.ai

What usage data does this provider expose?

OpenRouter exposes credit balance and usage data via their REST API:

• Total usage (USD spent): lifetime, daily, weekly, monthly breakdowns
• Spending limit (if configured): hard cap set by user
• Remaining credits: limit minus usage
• Free tier detection: boolean flag

API Endpoint: GET https://openrouter.ai/api/v1/key
Auth method: Bearer token with a standard OpenRouter API key
Response fields: usage, usage_daily, usage_monthly, limit, limit_remaining, is_free_tier

Will you build the plugin?

Yes, I will submit a PR

Additional Context

I have a working implementation locally with tests passing. One thing worth discussing before submitting the PR:

API key storage: Unlike other providers (Claude, Codex, Copilot, etc.), OpenRouter doesn't have a desktop app or CLI that stores credentials locally. The current implementation reads the API key from a config file in pluginDataDir (config.json with {"apiKey": "sk-or-..."}).

Possible alternatives:

• Add OPENROUTER_API_KEY to the env var whitelist (one-line Rust change) — many devs already have this set in their shell
• Wait for the OAuth flow discussed in Add proper OAuth flow to plugin API #71

Would love guidance on the preferred approach before submitting the PR.

API docs: https://openrouter.ai/docs/api/api-reference/api-keys/get-current-key

[garanda21]

Maybe you also wanna take a look to:

https://openrouter.ai/docs/api/api-reference/analytics/get-user-activity

Returns user activity data grouped by endpoint and requires a Management key