Solver API Overview

The Solver API is the authenticated interface for solvers to submit quotes, manage accounts, and track reputation. All solver endpoints require an API key.

For integrator-facing endpoints (quotes, orders, status tracking), see the Intents API Overview.

Base URLs

Environment	Base URL	Solver UI
Production	`https://order.li.fi`	intents.li.fi
Testnet	`https://order-dev.li.fi`	devintents.li.fi

Interactive API documentation is available at /docs on both environments.

Authentication

All Solver API endpoints require an API key passed via the x-api-key header. Register for a key in the solver UI linked above. See Authentication for full details.

curl -X POST 'https://order.li.fi/quotes/submit' \
  -H 'Content-Type: application/json' \
  -H 'x-api-key: YOUR_SOLVER_API_KEY' \
  -d '{ ... }'

Keep your API key out of client-side code and version control — load it from an environment variable or secret store.

Endpoints

Quote Management

Method	Path	Description
`POST`	`/quotes/submit`	Submit or update up to 200K solver quotes at once
`GET`	`/solver-api/quotes`	Retrieve your currently uploaded quote inventory

Quotes define the routes, price curves, and amount ranges you’re willing to fill. The order server uses your quotes to match intents, so you don’t need to respond to individual quote requests. See Quoting Orders for the full quote format and strategy.

Account Management

Method	Path	Description
`GET`	`/api/v1/solver/register/message`	Get a one-time message to sign (valid 24 h, single-use)
`POST`	`/api/v1/solver/register`	Register a solver account — EVM ECDSA, EIP-1271, or Solana ed25519 signatures
`POST`	`/api/v1/solver/unregister`	Unregister a solver account

See Registering Accounts for the full walkthrough. The legacy V0 endpoints /solver-api/account/register and /solver-api/account/unregister (EVM signatures, no server-issued message) remain available for existing integrations.

Supported Contracts

Method	Path	Description
`GET`	`/api/v1/solver/supported-contracts`	Read your declared oracle / input-settler / output-settler set
`PUT`	`/api/v1/solver/supported-contracts`	Replace the full set (CAIP-2 `{chain, address}` entries)

Your declared contract set decides which routes your quotes can serve.

Reputation

Method	Path	Description
`GET`	`/solver-api/solver/identities`	Get solver identities registered for reputation tracking
`GET`	`/api/v1/solver/reliability`	Get your current status, active pauses and trials, and miss counts
`GET`	`/api/v1/solver/reliability/pauses`	List your pause history, newest first

See Reputation for which orders count and when you can be paused.

Order Collection

Solvers receive orders via two channels:

WebSocket (recommended): Connect to the order server for real-time order streaming.
On-chain monitoring: Watch for Open events on the InputSettlerEscrow or InputSettlerCompact contracts.

See Order Flow for connection details and order validation.

Solver Flow Summary

Register account → Submit quotes → Receive orders → Fill outputs → Validate via oracle → Settle

Step	What you do	Reference
Register	Register your accounts via `/api/v1/solver/register`	This page
Quote	Push inventory to `/quotes/submit`	Quoting
Receive	Connect to WebSocket or monitor on-chain events	Order Flow
Fill	Deliver assets via `OutputSettlerSimple.fill()`	Solving LI.FI Intents
Prove	Submit fill proof through the oracle system	Oracle Systems
Settle	Call `finalise` on the input settler to receive payment	Settlement

Next Steps

Solving LI.FI Intents

Full solver integration guide with order types and filling

Quoting Orders

Quote format, price curves, and inventory management

Order Flow

WebSocket connection, order validation, and on-chain monitoring

Authentication

API key registration and environment details

Getting Started

Intents API

Solver API

MCP Server

Architecture

Knowledge Base

Solver API Overview

Base URLs

Authentication

Endpoints

Quote Management

Account Management

Supported Contracts

Reputation

Order Collection

Solver Flow Summary

Next Steps

Solving LI.FI Intents

Quoting Orders

Order Flow

Authentication

​Base URLs

​Authentication

​Endpoints

​Quote Management

​Account Management

​Supported Contracts

​Reputation

​Order Collection

​Solver Flow Summary

​Next Steps

Solving LI.FI Intents

Quoting Orders

Order Flow

Authentication

Base URLs

Authentication

Endpoints

Quote Management

Account Management

Supported Contracts

Reputation

Order Collection

Solver Flow Summary

Next Steps