# Step 2: Initialize Token Bonding Curve (TBC)

### TBC Resources

{% content-ref url="/pages/cxtp5jf60qFp3dMXqsSF" %}
[TBC Guides](/rly-protocol/get-started/tbc-on-solana/step-2-initialize-token-bonding-curve-tbc/tbc-guides.md)
{% endcontent-ref %}

{% content-ref url="/pages/ZTpbD3bdJbBg6PzJWqoW" %}
[TBC Examples](/rly-protocol/get-started/tbc-on-solana/step-2-initialize-token-bonding-curve-tbc/tbc-examples.md)
{% endcontent-ref %}

## Initialize the TBC

### Step 2.1: Initialize the TBC

Configure your TBC parameters. View the [TBC Guide](/rly-protocol/get-started/tbc-on-solana/step-2-initialize-token-bonding-curve-tbc/tbc-guides.md) and [Examples](/rly-protocol/get-started/tbc-on-solana/step-2-initialize-token-bonding-curve-tbc/tbc-examples.md) pages for help.

{% tabs %}
{% tab title="CLI" %}

```
Usage: rly-cli tbc-init [options] <token_a> <token_b> <token_b_liquidity>

Arguments:
  token_a                              token A
  token_b                              token B
  token_b_liquidity                    token B liquidity (base units)

Options:
  -e, --env <string>                   Solana cluster env name (default: "devnet")
  -k, --keypair <path>                 Solana wallet location (default: "--keypair not provided")
  --slope_numerator <string>           slope numerator
  --slope_denominator <string>         slope denominator
  --init_price_a_numerator <string>    initial price token A
  --init_price_a_denominator <string>  initial price token A
  -h, --help                           display help for command
```

{% endtab %}

{% tab title="TS" %}

```
// token bonding curve

import { Provider } from "@project-serum/anchor"
import { Keypair, Connection, clusterApiUrl } from 'solana/web3js`;
import { tokenSwapProgram } from 'rly-js';

const walletKeyPair = Keypair.generate();
const provider = new Provider(new Connection(clusterApiUrl("devnet")), new NodeWallet(walletKeyPair), {});

const tokenSwap = await tokenSwapProgram(provider);
```

Examples: <https://github.com/rally-dfs/dfs-ts/tree/main/ts/tests>
{% endtab %}
{% endtabs %}

{% hint style="info" %}
The keypair used above is required to be the same keypair that owns the initial minted app token in Step 1 because that's where the liquidity is coming from.
{% endhint %}

{% hint style="info" %}
Token A is the sRLY token on production environments. On non production environments,  token A can be any SPL token. It is recommended that you create an SPL token that has [similar properties as sRLY](https://explorer.solana.com/address/sRLY3migNrkC1HLgqotpvi66qGkdNedqPZ9TJpAQhyh). \
Token B is your application token from Step 1.&#x20;
{% endhint %}

### Step 2.2: **Supply application tokens to the TBC swap (Automatic)**

Once the TBC is configured and initialized, two token accounts will automatically be created in the swap program:&#x20;

1. A token account for token A (sRLY on prod, any SPL token on devnet)
2. A token account for your application token (token B)&#x20;

Once created, the initial token B supply amount will be transferred from the authorized wallet to the token B account owned by the swap program.

{% hint style="info" %}
The new bonding curve should start out with only the newly minted token B in the swap. As users buy against the curve, the collateral in sRLY builds.
{% endhint %}

{% hint style="warning" %}
Note: Pool tokens and deposits/withdrawals of pool tokens are intentionally disabled so that liquidity can't be added/removed from the swap outside of the swap instruction.
{% endhint %}

## That's it!

In this section you should have:

* Initialized a TBC based on your parameters&#x20;
* Verified the token account for your app token owned by the swap program&#x20;
* Verified the token account for sRLY owned by the swap program&#x20;
* Verified the transfer and balance of the initial supply of application token to app token account&#x20;


---

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