## Top Up Organization Prepaid Balance

**post** `/v1/organizations/{organization_id}/billing/topup`

Charge the card on file and credit the prepaid balance. A unique Idempotency-Key header is required; reuse it across retries so a timed-out top-up is not charged twice.

### Path Parameters

- `organization_id: string`

### Header Parameters

- `"Idempotency-Key": string`

### Body Parameters

- `amount: string`

  Amount to charge and credit, in USD. Must be greater than 0, at most two decimal places, and at most 10000.

### Returns

- `OrganizationBillingSummary object { daily_cost, effective_balance, monthly_cost, 3 more }`

  Forward-looking billing summary for an organization. All costs are run-rate projections from the organization's current active usage ("≈ $X/mo at current usage").

  - `daily_cost: string`

    Arbitrary-precision decimal serialized as a string (e.g. "58.40").

  - `effective_balance: string`

    Arbitrary-precision decimal serialized as a string (e.g. "58.40").

  - `monthly_cost: string`

    Arbitrary-precision decimal serialized as a string (e.g. "58.40").

  - `recharge_threshold_fraction: string`

    Arbitrary-precision decimal serialized as a string (e.g. "58.40").

  - `estimated_next_charge_at: optional string`

    Projected date the balance reaches the recharge threshold at the current run-rate. Null when there is no active usage (never charges).

  - `runway_months: optional string`

    Arbitrary-precision decimal serialized as a string (e.g. "58.40").

### Example

```http
curl https://api.nirvanalabs.io/v1/organizations/$ORGANIZATION_ID/billing/topup \
    -H 'Content-Type: application/json' \
    -H "Authorization: Bearer $NIRVANA_LABS_API_KEY" \
    -d '{
          "amount": "50.00"
        }'
```

#### Response

```json
{
  "daily_cost": "-69125",
  "effective_balance": "-69125",
  "monthly_cost": "-69125",
  "recharge_threshold_fraction": "-69125",
  "estimated_next_charge_at": "2025-01-01T00:00:00Z",
  "runway_months": "-69125"
}
```