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

# Arm risk score fuse

> Arm a one-shot bypass fuse that skips risk score validation for the next purchase on a card.

Arms a one-shot fuse on a virtual card. When the fuse is active, the **next purchase** on that card skips risk score validation and is automatically approved (subject to other checks). After that purchase fires, the fuse is consumed and risk validation resumes normally.

Use this endpoint to temporarily unblock a trusted cardholder who is being incorrectly declined by the risk engine. Requires an API key with access level 2 or higher.

## Path parameters

<ParamField path="cardId" type="string" required>
  Card identifier.
</ParamField>

## Body

<ParamField body="reason" type="string">
  Optional reason for arming the fuse. Used for audit purposes.
</ParamField>

## Response

<ResponseField name="card_id" type="string">
  Card identifier the fuse is armed for.
</ResponseField>

<ResponseField name="company_id" type="string">
  Company identifier that owns the card.
</ResponseField>

<ResponseField name="activated_by" type="string">
  Identifier of who activated the fuse. For API requests this is the company ID.
</ResponseField>

<ResponseField name="activated_at" type="string">
  ISO 8601 timestamp of when the fuse was armed.
</ResponseField>

<ResponseField name="channel" type="string">
  Channel through which the fuse was armed. Always `API` for this endpoint.
</ResponseField>

<ResponseField name="reason" type="string">
  Reason provided when arming the fuse, if any.
</ResponseField>

<RequestExample>
  ```bash cURL theme={null}
  curl -X POST "https://api.cryptomate.me/cards/virtual-cards/card_6f1e2a30-4a3c-4b2e-9a1d-5e8c9b7a1f23/risk-score-fuse" \
    -H "x-api-key: $CRYPTOMATE_API_KEY" \
    -H "Content-Type: application/json" \
    -d '{
      "reason": "Manual override for trusted transaction"
    }'
  ```
</RequestExample>

<ResponseExample>
  ```json 200 OK theme={null}
  {
    "card_id": "card_6f1e2a30-4a3c-4b2e-9a1d-5e8c9b7a1f23",
    "company_id": "company_abc123",
    "activated_by": "company_abc123",
    "activated_at": "2026-05-31T14:30:00",
    "channel": "API",
    "reason": "Manual override for trusted transaction"
  }
  ```
</ResponseExample>