Overview - Credit runs on Sprinter

Solve RFQ covers the two ways to get an executable price out of Sprinter.

	LI.FI Intents	Swap API
Liquidity	Sprinter Liquidity — underwritten, reserved for your quote	Public on-chain AMM liquidity
Price	Firm. Reserved for 15s and filled at exactly that price	Indicative, subject to slippage
Use for	Redemptions, subscriptions, and any flow where the user is promised a price	Generic token swaps, and as a fallback when no Sprinter route exists
Requires	Asset onboarded and route configured with Sprinter	Nothing — any supported pair
Base URL	`https://api.sprinter.tech`	`https://swaps.sprinter.tech/{network}`
Auth	`X-Auth-Token` header	HTTP Basic

Default to LI.FI Intents. It is the path that draws on Sprinter Liquidity, which is what makes an instant fill at a promised price possible. Reach for the Swap API when the pair is not onboarded with Sprinter, or as a fallback when a quote does not return.

LI.FI Intents

Two calls. The first prices the order and holds the liquidity; the second turns that into a transaction the user signs.

GET  /lifi-intents/rfq          → quote (liquidity reserved, 15s)
POST /lifi-intents/transaction  → same quote + unsigned open() calldata
                                → reservation refreshed to 60s from this call
                                → user sends it; Sprinter fills

Endpoint	Description
`GET /lifi-intents/rfq`	Firm quote backed by reserved Sprinter liquidity
`POST /lifi-intents/transaction`	Escrow `open` transaction for a quote

Authenticate the RFQ call with your API key in the X-Auth-Token header. The transaction call carries the quote itself, so it needs no header. The responses follow LI.FI’s own intents API shapes, with one difference worth coding for: when Sprinter cannot serve a request it returns 404, not a 200 with an empty quotes array.

Quotes only return for assets Sprinter has onboarded — underwritten, allocated liquidity to, and configured routes for. See the Asset Issuer quickstart for what onboarding involves.

Swap API

Route a swap against public on-chain liquidity and get back executable call data. No onboarding, no reservation, no firm price.

Endpoint	Description
`GET /v1/route`	Optimal swap route and execution call data

See the Swap API overview for base URLs, authentication, and the response format.

Not this: the Liquidity API

Sprinter Liquidity exposes the borrow-quote and signing endpoints directly. That surface is for crosschain solvers running their own fill infrastructure — it hands you a borrow authorization, not a transaction, and expects you to settle the intent yourself. If you are an asset issuer, wallet, or application asking Sprinter for a price, use LI.FI Intents. The RFQ endpoint runs the same pricing and reservation pipeline and returns something you can sign.

​LI.FI Intents

​Swap API

​Not this: the Liquidity API

LI.FI Intents

Swap API

Not this: the Liquidity API