# Supported Tokens & Networks

Use the `token` and `network` fields in payment and product creation requests. Not all token/network combinations are supported — refer to the table below.

***

## Compatibility matrix

| Token       | ERC20 (Ethereum) | BASE (Base) | BEP20 (BNB Chain) | ARB (Arbitrum) | POL (Polygon) |
| ----------- | :--------------: | :---------: | :---------------: | :------------: | :-----------: |
| **USDT**    |        Yes       |      —      |        Yes        |       Yes      |      Yes      |
| **USDC**    |        Yes       |     Yes     |        Yes        |       Yes      |      Yes      |
| **DAI**     |        Yes       |      —      |        Yes        |        —       |      Yes      |
| **ETH**     |        Yes       |     Yes     |         —         |       Yes      |       —       |
| **BNB**     |         —        |      —      |        Yes        |        —       |       —       |
| **POL**     |         —        |      —      |         —         |        —       |      Yes      |
| **ASTRAAI** |        Yes       |      —      |         —         |        —       |       —       |

***

## Networks

| Network | Chain              | Notes                                        |
| ------- | ------------------ | -------------------------------------------- |
| `ERC20` | Ethereum mainnet   | Highest fees                                 |
| `BASE`  | Base (Coinbase L2) | Lowest fees — recommended for most use cases |
| `BEP20` | BNB Chain          | Low fees                                     |
| `ARB`   | Arbitrum One       | Low fees                                     |
| `POL`   | Polygon PoS        | Low fees                                     |

{% hint style="info" %}
**Recommended default:** USDC on BASE. Lowest transaction fees, fast confirmation, and wide wallet support.
{% endhint %}

***

## Example — specifying token and network

```bash
curl -X POST https://apipay.byastra.ai/v1/api/payments \
  -H "X-Api-Key: ap_live_your_api_key" \
  -H "Content-Type: application/json" \
  -d '{
    "amount": 49.99,
    "token": "USDC",
    "network": "BASE",
    "redirect_url": "https://yourapp.com/success"
  }'
```

An unsupported combination (e.g. `ETH` on `BEP20`) returns `422 UNPROCESSABLE_ENTITY`.