# For Market Makers

{% hint style="info" %}
**Good to know:** depending on the product you're building, it can be useful to explicitly document use cases. Got a product that can be used by a bunch of people in different ways? Maybe consider splitting it out!
{% endhint %}

## Programatic Trading Integrations

Fermi’s “promised-capital” primitive decouples inventory from liquidity provision. Lock any Solana SPL asset (or a basket) in a vault once; mint transferable vouchers that count as margin for any number of open orders. A single USDC can therefore back bids across twenty markets while it is simultaneously earning yield elsewhere—capital efficiency you normally only get on centralized prime brokers.

Makers earn a rebate schedule that scales with posted depth and time-at-best, paid in the taker’s quote asset; they also collect a share of Continuum’s sequencing fees for each block their liquidity helps settle. Because execution is provably FIFO, you can quote tighter spreads with lower adverse-selection risk, and you never need to over-pay gas to “guard” your position against sniping.

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

#### Using the Rust Client Crate in Custom Rust Scripts <a href="#using-the-rust-client-crate-in-custom-rust-scripts" id="using-the-rust-client-crate-in-custom-rust-scripts"></a>

You can use the Fermi sequencer client crate to write your own Rust scripts:

```
use sequencer_client::market;
use sequencer_client::order_place;
use sequencer_client::order_cancel;
use sequencer_client::types::OrderSide;
use std::error::Error;

#[tokio::main]
async fn main() -> Result<(), Box<dyn Error>> {
    // Create HTTP client
    let client = reqwest::Client::new();
    let server_url = "http://localhost:8082";
    
    // List markets
    let markets = market::list_markets(&client, server_url).await?;
    
    // Find a specific market
    let market = markets.iter()
        .find(|m| m.name == "SOL/USDC")
        .ok_or("SOL/USDC market not found")?;
    
    // Place a buy order
    order_place::place_order(
        &client,
        server_url,
        "./keypairs/your_keypair.json",
        OrderSide::Buy,
        100,  // Price
        1000, // Quantity
        &market.uuid,
        123   // Order ID
    ).await?;
    
    Ok(())
}
```

Key features for custom script development:

* Market operations: list, create, view orderbooks
* Order operations: place buy/sell orders, cancel orders
* Automated workflows: market making, testing, simulation

Dependencies required:

* `reqwest` for HTTP communication
* `tokio` for async runtime
* `serde` and `serde_json` for serialization
* `ed25519-dalek` for cryptographic signing

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{% tab title="TS" %}
You can find the TS sdk on the following link: <https://github.com/zerooo111/fermi-hybrid-sdk>
{% endtab %}
{% endtabs %}