> ## Documentation Index
> Fetch the complete documentation index at: https://shinydapps-bd9fa40b.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Wallets

> Connect Blink or Alby to let your agent pay Lightning invoices automatically.

## Supported wallets

| Wallet                          | Install                |     Self-custody     | Notes                      |
| ------------------------------- | ---------------------- | :------------------: | -------------------------- |
| [Blink](https://blink.sv)       | built-in               |      ❌ custodial     | Easiest setup, GraphQL API |
| [Alby Hub](https://getalby.com) | built-in               | ✅ self-hosted option | REST API, supports own Hub |
| Custom                          | `L402Wallet` interface |           ✅          | Bring your own wallet      |

***

## BlinkWallet

### Setup

1. Sign up at [blink.sv](https://blink.sv)
2. Go to **Dashboard → API Keys** → create a key
3. Copy your **Wallet ID** from the dashboard

```bash theme={null}
export BLINK_API_KEY="your-api-key"
export BLINK_WALLET_ID="your-wallet-id"
```

### Node.js

```typescript theme={null}
import { BlinkWallet } from "l402-kit";

const wallet = new BlinkWallet(
  process.env.BLINK_API_KEY!,
  process.env.BLINK_WALLET_ID!,
);
```

### Python

```python theme={null}
from l402kit.wallets import BlinkWallet

wallet = BlinkWallet(
    api_key=os.environ["BLINK_API_KEY"],
    wallet_id=os.environ["BLINK_WALLET_ID"],
)
```

### How it works

Calls the [Blink GraphQL API](https://api.blink.sv/graphql) with the `lnInvoicePaymentSend` mutation. Returns the `preImage` from the settled transaction.

***

## AlbyWallet

### Setup

1. Create an account at [getalby.com](https://getalby.com)
2. Go to **Settings → Access Tokens** → create a token with `payments:send` scope
3. (Optional) Run your own [Alby Hub](https://github.com/getAlby/hub) for self-custody

```bash theme={null}
export ALBY_TOKEN="your-access-token"
# Optional — only needed for self-hosted Hub:
export ALBY_HUB_URL="https://your-hub.example.com"
```

### Node.js

```typescript theme={null}
import { AlbyWallet } from "l402-kit";

// Alby cloud
const wallet = new AlbyWallet(process.env.ALBY_TOKEN!);

// Self-hosted Hub
const wallet = new AlbyWallet(
  process.env.ALBY_TOKEN!,
  process.env.ALBY_HUB_URL,  // optional base URL
);
```

### Python

```python theme={null}
from l402kit.wallets import AlbyWallet

# Alby cloud
wallet = AlbyWallet(os.environ["ALBY_TOKEN"])

# Self-hosted Hub
wallet = AlbyWallet(
    access_token=os.environ["ALBY_TOKEN"],
    base_url=os.environ.get("ALBY_HUB_URL", "https://api.getalby.com"),
)
```

### How it works

Calls `POST /payments/bolt11` on the Alby Hub REST API with a `Bearer` token. Returns the `payment_preimage` from the response.

***

## Custom wallet

Implement the `L402Wallet` interface to use any Lightning wallet:

<Tabs>
  <Tab title="TypeScript">
    ```typescript theme={null}
    import type { L402Wallet } from "l402-kit";

    class PhoenixWallet implements L402Wallet {
      async payInvoice(bolt11: string): Promise<{ preimage: string }> {
        const res = await fetch("http://localhost:9740/payinvoice", {
          method: "POST",
          body: new URLSearchParams({ invoice: bolt11 }),
        });
        const data = await res.json();
        return { preimage: data.paymentPreimage };
      }
    }
    ```
  </Tab>

  <Tab title="Python">
    ```python theme={null}
    from l402kit import L402Wallet
    import httpx

    class PhoenixWallet(L402Wallet):
        def pay_invoice(self, bolt11: str) -> str:
            r = httpx.post(
                "http://localhost:9740/payinvoice",
                data={"invoice": bolt11},
            )
            r.raise_for_status()
            return r.json()["paymentPreimage"]
    ```
  </Tab>
</Tabs>

The interface requires a single method:

| Method               | TypeScript                                          | Python                            |
| -------------------- | --------------------------------------------------- | --------------------------------- |
| Pay a BOLT11 invoice | `payInvoice(bolt11): Promise<{ preimage: string }>` | `pay_invoice(bolt11: str) -> str` |

***

## Choosing a wallet

* **Testing / prototyping** → Blink (custodial, instant setup, free tier)
* **Production agent, max control** → Alby Hub self-hosted (non-custodial, REST API)
* **High throughput / low fees** → Phoenix via custom `L402Wallet` (non-custodial, ACINQ)
* **Enterprise** → LNbits self-hosted via custom wallet