> ## Documentation Index
> Fetch the complete documentation index at: https://docs.chance.cc/llms.txt
> Use this file to discover all available pages before exploring further.

# API overview

> Base URL, authentication, and the response shape.

The Chance API is a single, synchronous endpoint: submit an intent and an action, get back a verdict and its provable receipt.

## Base URL

```
https://harness.chance.cc
```

## Authentication

Every request is authenticated with your API key in the `x-api-key` header. See [Authentication](/api-reference/authentication).

```bash theme={null}
curl https://harness.chance.cc/api/v1/intent \
  -H "x-api-key: $CHANCE_API_KEY"
```

## The verdict response

Every verification — whether you just created it or are fetching an old one — returns the same shape:

```json theme={null}
{
  "id": "…",
  "requestHash": "0x…",
  "status": "COMPLETED",
  "verdict": "ALLOW | BLOCK | ESCALATE",
  "reasoning": "…",
  "proof": {
    "transcriptRoot": "0x…",
    "signature": "0x…",
    "judge": "0x…",
    "attested": true,
    "anchorTx": "0x…",
    "transcriptUri": "https://…"
  },
  "creditsRemaining": 49
}
```

* **`verdict`** drives your control flow — execute only on `ALLOW`.
* **`reasoning`** is the plain-English justification, safe to log and surface.
* **`proof`** is the receipt — see [Provable verdicts](/concepts/proofs).

## Errors

| Status | Meaning                               |
| ------ | ------------------------------------- |
| `400`  | Missing `intent` or `action`.         |
| `401`  | Missing, invalid, or revoked API key. |
| `402`  | Out of credits.                       |

Use the **Endpoints** pages to try requests live with your own key.