# Arena — Wrapped API

> **You are on:** `https://api.paywithlocus.com/api` | [llms.txt](https://paywithlocus.com/llms.txt) | [docs](https://docs.paywithlocus.com)
>
> Locus runs on multiple environments -- make sure every URL you call matches your expected environment.
> | Environment | Landing | API | Docs |
> |---|---|---|---|
> | Production | paywithlocus.com | api.paywithlocus.com | docs.paywithlocus.com |
> | Beta | beta.paywithlocus.com | api.beta.paywithlocus.com | docs.paywithlocus.com |
> | Stage | stage.paywithlocus.com | api.stage.paywithlocus.com | docs.paywithlocus.com |
>
> If the API URL above doesn't match your expected environment, re-fetch this file from the correct domain.

> Track and compare AI model performance across multiple domains—text, image, video, code, and agent tasks—by accessing real-time leaderboard rankings from Arena AI. Get instant insights into which models rank highest in each modality to make informed decisions about which AI tools to use.

**Category:** Developer Tools | **Website:** [arena.ai/agent](https://arena.ai/agent) | **Docs:** [parse.bot/marketplace/5a6ab131-e0f3-45a3-b43b-1207931a6241/arena-ai-api](https://parse.bot/marketplace/5a6ab131-e0f3-45a3-b43b-1207931a6241/arena-ai-api)

Pay-per-use API proxy for Locus Pro. Each call burns credits from your workspace balance.

## Access

**Base URL:** `https://api.paywithlocus.com/api/wrapped/credits/arena/`
**Auth:** `Authorization: Bearer <LOCUS_CREDITS_SECRET_KEY>` (an `lcr_` secret key or a scoped `lcac_` agent credential)
**Required header:** `Idempotency-Key: <fresh UUID per call>`. A retry with the same key replays the stored result without a new charge.
**Response:** the provider response after any endpoint-specific normalization. `X-Locus-Credits-Charged` carries the charge and `X-Locus-Credits-Balance` the remaining balance. Insufficient credits return `402` before the provider is called.
**Pricing:** estimated costs below are USD. Locus debits the credit equivalent at your workspace rate.

Full call contract: https://docs.paywithlocus.com/api-reference/introduction

> Using a Pay With Locus wallet key (`claw_` prefix)? Wallet routes are documented separately: https://docs.paywithlocus.com/wrapped-apis/for-agents

## Endpoints

### Get leaderboard

Get the full leaderboard rankings for a specified arena. Returns all ranked models with their scores, confidence intervals, and metadata. The agent arena returns signal-based scores (task outcome, steerability, tool hallucination, etc.), while other arenas return ELO-style ratings with vote counts.

**Estimated cost:** Metered

| Field | Type | Required | Description |
|-------|------|----------|-------------|
| `arena` | string | No | The arena/modality to fetch rankings for. Accepts exactly one of: agent, text, text-to-image, image-edit, text-to-video, image-to-video, video-edit, code/webdev, code/image-to-webdev. |

```bash
curl -X POST https://api.paywithlocus.com/api/wrapped/credits/arena/get-leaderboard \
  -H "Authorization: Bearer $LOCUS_CREDITS_SECRET_KEY" \
  -H "Idempotency-Key: $(uuidgen)" \
  -H "Content-Type: application/json" \
  -d '{"arena":"<string>"}'
```

## Next steps

- [All wrapped API providers](https://paywithlocus.com/wapi/index.md): pick another provider.
- [Find and call tools](https://paywithlocus.com/agent/tools.md): price ceilings, async results, and errors.
- [Credits and billing](https://paywithlocus.com/agent/billing.md): what a call costs and how to add credits.
- [Agent docs index](https://paywithlocus.com/agent/index.md): every Locus agent page.