# Create topup

URL: https://docs.hanzo.ai/docs/openapi/billing/post-billing-topup

> Charges a card the caller already saved and credits the balance.

`POST /v1/billing/topup`

> [Billing →](https://docs.hanzo.ai/docs/openapi/billing) · [All API references →](https://docs.hanzo.ai/docs/openapi) · [Get started →](https://docs.hanzo.ai/docs/guides)

|               |                                         |
| ------------- | --------------------------------------- |
| **Address**   | `https://api.hanzo.ai/v1/billing/topup` |
| **Method**    | `POST`                                  |
| **Operation** | `post_billing_topup`                    |
| **Auth**      | `Authorization: Bearer $HANZO_API_KEY`  |

Charges a card the caller already saved and credits the
balance. Same receipt and the same retry safety as the token endpoint; the only
difference is which card, so a caller topping up from a saved method never
re-enters one.

## Request

5 fields, body `application/json` (required).

| Field               | In     | Type            | Required | Description                                                                        |
| ------------------- | ------ | --------------- | -------- | ---------------------------------------------------------------------------------- |
| `X-Idempotency-Key` | header | string          | —        |                                                                                    |
| `amountCents`       | body   | integer (int64) | —        | AmountCents is how much to charge, in cents of Currency.                           |
| `currency`          | body   | string          | —        | Currency is the ISO-4217 code to charge in.                                        |
| `paymentMethodId`   | body   | string          | —        | MethodID names a card the subject already saved, for the saved-card endpoint.      |
| `sourceId`          | body   | string          | —        | SourceID is a single-use card token from the payment form, for the token endpoint. |

## Response

| Status    | Body            | Meaning |
| --------- | --------------- | ------- |
| `200`     | billing.Charged | ok      |
| `default` | problem-details | refused |

`200` body — 5 fields.

| Field           | In   | Type            | Always | Description                                                                                                                            |
| --------------- | ---- | --------------- | ------ | -------------------------------------------------------------------------------------------------------------------------------------- |
| `balanceCents`  | body | integer (int64) | —      | BalanceCents is the subject's balance AFTER the charge settled, in cents, so a caller does not have to re-read to show the new number. |
| `processorRef`  | body | string          | —      | ProcessorRef is the payment processor's own reference.                                                                                 |
| `status`        | body | string          | —      | Status is how the charge ended.                                                                                                        |
| `test`          | body | boolean         | —      | Test states which bucket was credited — sandbox money or real money — so no reader has to guess whether a receipt is real.             |
| `transactionId` | body | string          | —      | TransactionID is the ledger entry this charge created.                                                                                 |

Failure carries the platform error shape — see [Errors](https://docs.hanzo.ai/docs/errors).

## Examples

**CLI**

```bash
hanzo billing topup create
```

**SDK**

**.ts**

```ts
import { Configuration, BillingApi } from 'hanzoai';

const api = new BillingApi(new Configuration({ accessToken: process.env.HANZO_API_KEY }));
const { data } = await api.postBillingTopup({ amountCents: 0, currency: "<currency>" });
```

**.py**

```python
from hanzoai.cloud import ApiClient, Configuration
from hanzoai.cloud.api import BillingApi

client = ApiClient(Configuration(access_token=os.environ["HANZO_API_KEY"]))
result = BillingApi(client).post_billing_topup(amount_cents=0, currency="<currency>")
```

**.go**

```go
cfg := hanzoai.NewConfiguration()
cfg.AddDefaultHeader("Authorization", "Bearer "+os.Getenv("HANZO_API_KEY"))
client := hanzoai.NewAPIClient(cfg)

resp, _, err := client.BillingAPI.PostBillingTopup(context.Background()).Execute()
if err != nil {
	return err
}
```

**.rs**

```rust
use hanzo_client::apis::{configuration::Configuration, billing_api};

let mut cfg = Configuration::new();
cfg.bearer_access_token = std::env::var("HANZO_API_KEY").ok();

let result = billing_api::post_billing_topup(&cfg, Default::default()).await?;
```

**.java**

```java
import ai.hanzo.cloud.ApiClient;
import ai.hanzo.cloud.api.BillingApi;

ApiClient client = new ApiClient();
client.setBearerToken(System.getenv("HANZO_API_KEY"));

var result = new BillingApi(client).postBillingTopup();
```

**HTTP**

```bash
curl -X POST https://api.hanzo.ai/v1/billing/topup \
  -H "Authorization: Bearer $HANZO_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
       "amountCents": 0,
       "currency": "<currency>"
     }'
```

**MCP**

MCP reaches **billing** through the `billing` tool, which names its 39 operations with its own verbs — this one among them, under a name only MCP declares. `describe` explains any of them:

```bash
curl -X POST https://api.hanzo.ai/v1/mcp \
  -H "Content-Type: application/json" \
  -d '{
       "jsonrpc": "2.0",
       "id": 1,
       "method": "tools/call",
       "params": {
         "name": "describe",
         "arguments": {
           "op": "list_billing_accounts"
         }
       }
     }'
```

---

[Billing API](https://docs.hanzo.ai/docs/openapi/billing) · [All Hanzo APIs](https://docs.hanzo.ai/docs/openapi) · [Interactive reference](https://docs.hanzo.ai/docs/openapi/reference)