> ## Documentation Index
> Fetch the complete documentation index at: https://docs.flashnet.xyz/llms.txt
> Use this file to discover all available pages before exploring further.

# Pricing

> Estimates and price guarantees

An estimate previews a price; a quote supplies funding instructions and pricing valid until `expiresAt`. [Fees](/orchestra/fees) explains the cost breakdown.

## Estimate, quote, fixed delivery

`GET /estimate` is stateless and allocates no deposit address. It needs no key unless you pass affiliate fields. Use it as inputs change.

`POST /quote` requires a key, persists the quote, and returns deposit instructions. Its pricing lasts 2 minutes, subject to slippage.

`deliveryMode: "fixed"` commits to `estimatedOut` with timely, full funding. Finalized underpayment can reduce the target; overpayment does not increase it.

For `/quote` and `/estimate`, fixed delivery requires exact-in, destination membership in `fixedTo`, and partner support. Unsupported requests fail; onramp can fall back for some availability failures, but still rejects unsupported routes. Trust the returned `deliveryMode`.

Both endpoints use route-dependent `slippageBps` defaults and minimums. Omit it to use the route's default.

Fund before `expiresAt`. Eligible late funding uses refreshed market pricing without the original price or fixed-output guarantee. Some expired submissions are rejected.

## Amounts

Amounts are integer strings in smallest units: `"50000000"` is 50 Base USDC; `"100000"` is 0.001 BTC. Read each asset's `decimals` from `/routes`.

* `exact_in` (default): `amount` is source units. Read `amountIn` and `estimatedOut`.
* `exact_out`: `amount` is destination units. Read `targetAmountOut`, `requiredAmountIn`, `maxAcceptedAmountIn`, and `inputBufferBps`. The destination must be in `exactOutTo`. Stablecoin targets must be whole cents, such as multiples of `10000` for a 6-decimal asset.

Onramp and pay links accept `amountFiatUsd` instead of `amount`. Eligible stablecoin onramps can select fiat-capped exact-out when partner fees are invoiced and no app or affiliate fees apply. Explicit `exact_in` prevents that selection. Use the returned mode and amounts.

`/quote` requires `refundAddress` for exact-out and Lightning destinations. Onramp leaves it optional, but missing refund details can obstruct recovery. Supply a valid refund target wherever supported.

Lightning destinations take a BOLT11 invoice as `recipientAddress`: amountless for exact-in; amountless or matching the target for exact-out.

Send the returned `amountIn`. Accepted differences can update input, fees, and output; route minimums, maximums, and funding rules still apply. Dust may create no order, and over-limit funding can be held. Lightning source invoices fix the amount.