> ## Documentation Index
> Fetch the complete documentation index at: https://docs.proportion.fi/llms.txt
> Use this file to discover all available pages before exploring further.
# For Backers
> Capital and infrastructure for launching a prop firm on Hyperliquid
> The backer owns the product. Proportion provides the funded layer.
Proportion is not open to the public yet. This section describes the backer flow implemented by the protocol.
For a backer, the funded account is the most capital-intensive part of a prop firm. Proportion funds it, enforces its floor and settles it. Evaluation, brand, marketing and trader selection stay your product. You interact with the protocol through its contracts. Trader orders pass through the exchange proxy, which checks them against the account's permissions before submitting them to Hyperliquid.
The vault allocates the capital. You pay `B + P` at activation, and whatever part of `B` the trader does not lose comes back. Where that money comes from is your business: in a prop firm it is usually the fees from challenges that did not pass, or any other revenue.
## What Proportion gives you
An SDK call creates an isolated on-chain account with capital, a floor and automatic risk enforcement. The account belongs to the trader within the protocol's rules.
| Your product | The protocol |
| ------------------------- | ----------------------------------------------------------------------------------------------------------- |
| Evaluation and selection | Capital from the LP vault |
| Trader onboarding | Floors computed on-chain, closes triggered by the risk engine, markets and leverage enforced at order entry |
| Brand, marketing, pricing | Settlement: the premium, the subscription and the profit split |
You decide who receives an account and on what commercial terms. The protocol enforces the funded account's capital rules and settlement.
## Who counts as the backer
For a direct activation, the wallet that pays `B + P` is recorded as the backer, the `builder` field of the account record. Funding yourself uses the same call with your own address as the trader, so one wallet is both backer and trader. Both ordinary profit shares then go to that address, as does the backer's share on a forfeiting close. For a challenge promotion or finance listing, `ChallengeVault` pays the activation charge and records the backer named in the challenge or listing.
## Where your revenue comes from
| Source | What it is |
| --------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Your share of trader profit | `builderPoolBps`, fixed per account at activation. You take that share of every profit withdrawal and of an ordinary close. See [Profit and Payouts](/funded/payouts) |
| Forfeited profit | If the account closes on a drawdown breach or a trader's own request, you take **half** of whatever profit it returns. See [Account Parameters and Fees](/backers/fees#what-comes-back) |
| Evaluation margin | Evaluation revenue after any checkout fees and the cost of funding the traders you select. See [Challenges](/challenges) |
| LP yield | Depositing into the vault earns LP shares. Shares are optional for direct funded activation but required to publish and sell challenge plans. See [Yield and Risks](/vault/yield) |
The subscription is not backer revenue: it splits between the vault and the protocol. Unused buffer does come back, but that is your own capital returning rather than income.
## Sections
How to open your first funded account
What the protocol enforces on-chain
What you choose, and how the activation charge is calculated
Where the capital comes from and what a loss costs