> For the complete documentation index, see [llms.txt](https://flowrouter.gitbook.io/flowrouter-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://flowrouter.gitbook.io/flowrouter-docs/reference/glossary.md).

# Glossary

| Term                | Meaning in FlowRouter                                                                                                                                                                                |
| ------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Account-bound quote | A quote associated with a particular wallet account and request context.                                                                                                                             |
| Allowance           | ERC-20 permission for a spender to transfer a token amount from an account.                                                                                                                          |
| API key             | An optional secret that a server sends in the `X-API-Key` header of the Swap API v1. It binds swaps to a referral code. Get one on the [API keys page](https://flowrouter.xyz/developers/api-keys/). |
| Approval            | A transaction that changes an ERC-20 allowance.                                                                                                                                                      |
| Base units          | A token's smallest integer units; one ETH is `10^18` wei.                                                                                                                                            |
| Basis point         | One hundredth of a percentage point; 50 bps is 0.5%.                                                                                                                                                 |
| Build               | Validation and construction of a transaction from a saved quote.                                                                                                                                     |
| Executable input    | The input amount committed to the transaction's route.                                                                                                                                               |
| Gas                 | The chain's measure of transaction execution work, paid for with native ETH.                                                                                                                         |
| Generation          | A versioned set of routing data identified by a digest.                                                                                                                                              |
| Indicative price    | A Swap API price without a transaction. It is not firm.                                                                                                                                              |
| Intent              | The selected account, chain, pair, amount, slippage, and unique identifier for a swap attempt.                                                                                                       |
| Maker               | FlowRouter's own liquidity source. It signs an offer for one account, and the route search compares it with other venues.                                                                            |
| Minimum received    | The output floor enforced by the swap.                                                                                                                                                               |
| Native token        | A chain's built-in currency; ETH on Robinhood Chain.                                                                                                                                                 |
| Positive surplus    | Output above the router's quoted output cap, subject to the surplus policy.                                                                                                                          |
| Quote               | A time-limited estimate for a particular token pair and input amount.                                                                                                                                |
| Receiver            | The account receiving the output token. The documented frontend uses the sender's account.                                                                                                           |
| Referral code       | A number registered in the FlowRouter contract. Each swap carries one. It can set a fee or a surplus share.                                                                                          |
| Route               | The ordered token flows and execution operations used to exchange the pair.                                                                                                                          |
| Simulation          | Execution of a proposed call against observed chain state without broadcasting a transaction.                                                                                                        |
| Slippage            | A change in execution output relative to the quote.                                                                                                                                                  |
| Source residue      | Requested input minus executable input.                                                                                                                                                              |
| Spender             | The address an ERC-20 allowance authorizes. In this frontend flow, the FlowRouter contract.                                                                                                          |
| Taker               | The account that sends the swap and receives the output. A maker offer is valid only for its taker.                                                                                                  |
| Venue               | A liquidity source or protocol used by a route.                                                                                                                                                      |
| WETH                | An ERC-20 representation of ETH; distinct from the native balance used for gas.                                                                                                                      |