> For the complete documentation index, see [llms.txt](https://docs.fira.money/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.fira.money/developers/protocol-contracts/yield-contracts/yield-contract-factory.md).

# YieldContractFactory

{% hint style="info" %}
**Source:** `src/fira_bonding/core/YieldContracts/YieldContractFactory.sol`
{% endhint %}

## Contract summary

Creates BT/CT pairs for a given FW and expiry. BT is deployed with `Create2`, CT with the split-code factory pattern (because CT bytecode exceeds 24KB).

## Validations

* Expiry must be in the future and divisible by `expiryDivisor`
* Duplicate FW+expiry pairs revert

## Storage

After deployment, the factory stores lookup mappings:

* `getBT[FW][expiry]` / `getCT[FW][expiry]` — Address discovery
* `isBT[addr]` / `isCT[addr]` — Validation

## Fee configuration

* `interestFeeRate` and `rewardFeeRate` (max 20% each)
* `treasury` address for fee collection
* `liquidityInjector` address, propagated to BT on creation

## Initialization

After deployment, BT is initialized with the CT address, establishing the one-to-one pairing.


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