LI.FI API Integration

LI.FI aggregates bridges, DEXs, intent solvers, and DeFi protocols behind one API. This skill covers the full product surface:

Product	Base URL	What it does
Core API (swaps & bridges)	https://li.quest/v1	Quotes, routes, execution data, status tracking across 75+ chains
Composer (DeFi execution)	https://li.quest/v1 (same /quote endpoint)	One-click swap/bridge + deposit/withdraw into vaults, lending, staking
Earn (yield data)	https://earn.li.fi/v1	Vault discovery, APY/TVL analytics, portfolio positions
Intents (solver marketplace)	https://order.li.fi	Intent-based orders filled by a competitive solver network

For AI agents, LI.FI also offers an MCP server (https://mcp.li.quest/mcp) and a CLI (@lifi/cli). LI.FI recommends agents and backends use the REST API directly rather than the SDK.

Authentication & Rate Limits

API key is optional — it only raises rate limits. Header: x-lifi-api-key (get one at the LI.FI Partner Portal).

curl "https://li.quest/v1/chains" -H "x-lifi-api-key: YOUR_API_KEY"

Tier	/quote, /advanced/routes	/advanced/stepTransaction	Other endpoints
Without API key	75 req / 2 hours	50 req / 2 hours	100 req / minute
With API key (default)	100 RPM (2-hour rolling window: 12,000 / 2h)	same	100 RPM

Responses include ratelimit-limit, ratelimit-remaining, ratelimit-reset (seconds) headers. 429 responses carry error code 1005. Never expose your API key in client-side code.

Quick Start — The Five-Call Recipe

The canonical flow for any swap/bridge:

1. GET /chains   → discover chains (id, key, chainType, nativeToken)
2. GET /tokens   → find tokens & decimals (?chains=1,42161)
3. GET /quote    → get quote with ready-to-sign transactionRequest
4. [Execute]     → if ERC-20: check allowance vs estimate.approvalAddress, approve if needed;
                   then sign & send transactionRequest
5. GET /status   → poll until DONE or FAILED

# 3. Quote (fromToken/toToken accept addresses OR symbols)
curl "https://li.quest/v1/quote?\
fromChain=42161&toChain=10&\
fromToken=0xaf88d065e77c8cC2239327C5EDb3A432268e5831&\
toToken=0xDA10009cBd5D07dd0CeCc66161FC93D7c9000da1&\
fromAmount=10000000&fromAddress=0xYourAddress&slippage=0.005"

# 5. Status (pass fromChain to speed it up; bridge = quote's `tool`)
curl "https://li.quest/v1/status?txHash=0xYourTxHash&fromChain=42161&toChain=10&bridge=across"

From the quote response, extract: transactionRequest (sign & send), estimate.approvalAddress (ERC-20 spender), estimate.toAmount/toAmountMin, estimate.executionDuration (basis for polling), and tool (pass as bridge to /status). Quotes go stale in ~60 seconds — re-fetch before signing if older (and always after a separate approval tx).

Core Endpoints

GET /quote

Single best route with transaction data ready for execution.

Parameter	Type	Required	Description
fromChain / toChain	string	Yes	Chain ID or key (same value = same-chain swap)
fromToken / toToken	string	Yes	Token address or symbol
fromAmount	string	Yes	Amount in smallest unit
fromAddress	string	Yes	Sender wallet address
toAddress	string	No	Recipient (defaults to fromAddress)
slippage	number	No	0.005 = 0.5% (default)
order	string	No	FASTEST or CHEAPEST
integrator	string	No	Your app ID (analytics + fee collection)
fee	number	No	Integrator fee (0.02 = 2%)
preset	string	No	Routing preset, e.g. stablecoin (see below)
allowBridges / denyBridges / preferBridges	string[]	No	Tool keys from /tools, or all/none/default
allowExchanges / denyExchanges / preferExchanges	string[]	No	Same
allowDestinationCall	boolean	No	Default true
maxPriceImpact	number	No	Default 0.10 (10%)
fromAmountForGas	string	No	Amount converted to gas on destination
skipSimulation	boolean	No	Faster response, less accurate gas limit
svmPriorityFeeLevel	string	No	Solana priority fee: NORMAL/FAST/ULTRA
swapStepTimingStrategies / routeTimingStrategies	string[]	No	e.g. minWaitTime-600-4-300

Variants:

• GET /quote/toAmount — pass toAmount instead of fromAmount; API computes the required input.
• POST /quote/contractCalls — bridge + arbitrary destination-chain contract calls (manual calldata). For supported DeFi protocols, prefer Composer instead.

POST /advanced/routes + POST /advanced/stepTransaction

Multiple route options for comparison. Note the different naming: body uses fromChainId, fromTokenAddress (addresses only), with filters and preset inside options{}. Routes contain steps without transaction data — POST each step to /advanced/stepTransaction to populate transactionRequest.

Use /quote for simple transfers (1 call); use /advanced/routes when the user needs choices or price comparison (2+ calls).

GET /status

txHash (required — sending hash, receiving hash, or step id), plus optional fromChain (recommended, speeds up response), toChain, bridge.

Statuses: NOT_FOUND → PENDING → DONE | FAILED. On DONE, check substatus: COMPLETED, PARTIAL (different token received — full value preserved), or REFUNDED. See Status Recovery below.

Discovery & utility

• GET /chains — ?chainTypes=EVM,SVM,UTXO,MVM,TVM. If omitted, returns EVM only. Non-EVM: Solana (SVM), Bitcoin (UTXO), Sui (MVM), Tron (TVM).
• GET /tokens — ?chains=1,137&tags=stablecoin&minPriceUSD=0.01
• GET /token — ?chain=POL&token=DAI
• GET /tools — valid bridge/exchange keys for the allow*/deny* filters
• GET /connections — available token-pair connections (at least one filter required)
• GET /gas/prices, /gas/prices/{chainId}, /gas/suggestion/{chain}` — gas data; GET /gas/status — LIFuel tx status
• GET /calldata/parse (beta) — ?callData=0x...&chainId=1 decodes LI.FI calldata into named function calls
• Analytics: GET /v1/analytics/transfers (filtered, max 1000), GET /v2/analytics/transfers (cursor-paginated), GET /v1/analytics/transfers/summary (cross-chain amounts received, 30-day max range)
• Integrator fees: GET /integrators/{integratorId} (collected fee balances), GET /integrators/{integratorId}/withdraw/{chainId} (withdrawal transactionRequest)

Deprecated — do not use: /advanced/possibilities, /gas/refetch, /analytics/wallets/{address}.

Routing Presets

preset=stablecoin (on /quote, or options.preset on /advanced/routes) applies optimized defaults for stablecoin transfers: order=CHEAPEST, slippage=0.001, price impact capped at 2%, and a shortlist of stablecoin-friendly bridges (Glacis, Mayan, Celer, Eco, Relay, Across, Gaszip). Explicit request params always override preset defaults — but list overrides like denyBridges replace the preset's lists entirely. Find qualifying tokens with GET /tokens?tags=stablecoin. (commerce preset coming soon.)

Composer — One-Click DeFi Deposits & Withdrawals

Composer bundles swap + bridge + protocol interaction (deposit, stake, lend, withdraw) into a single atomic transaction. There is no dedicated endpoint — set toToken to a supported protocol's vault/staking/deposit token address on the standard GET /quote, and Composer activates automatically:

# 100 USDC on Arbitrum → Morpho Spark USDC vault on Base, one signature
curl "https://li.quest/v1/quote?\
fromChain=42161&toChain=8453&\
fromToken=0xaf88d065e77c8cC2239327C5EDb3A432268e5831&\
toToken=0x7BfA7C4f149E7415b73bdeDfe609237e29CBF34A&\
fromAmount=100000000&fromAddress=0xYou&toAddress=0xYou"

• Detection: same-chain deposit quotes show the zap tool as top-level tool (e.g. composer, but the engine may route via other integrated zap tools such as fly); cross-chain quotes show the bridge as tool with the zap step in includedSteps. Don't hard-code on tool === "composer" — any quote with a vault address as toToken is a deposit route.
• Withdrawals: reverse it — vault token as fromToken, desired token as toToken.
• Every quote is simulated on a fork before being returned; failures surface as API errors instead of reverting txs.
• Coverage: ~29 protocols (Aave V3, Morpho, Pendle, Spark, Euler, Fluid, Yearn, EtherFi, Kelp, Ethena, Maple, …) across 23 EVM chains. Some are deposit-only (Ethena, Kinetiq, Maple, Royco, USDai, Concrete, Ember) — withdraw via the protocol's own UI.
• Limitations: EVM only; tokenized positions only (the target must mint a token); cross-chain flows are eventually consistent, not atomic — a destination deposit can fail after a successful bridge, leaving the user with the bridged token (poll /status, handle PARTIAL).
• Use higher slippage (e.g. 0.01) for cross-chain composer routes.

See references/REFERENCE.md for the full protocol list and error codes.

Earn — Yield Discovery & Portfolio Data

Earn is a read-only data API at https://earn.li.fi (separate host!) normalizing vaults from 20+ protocols. Unlike the core API, it requires the x-lifi-api-key header (401 without). Execution is delegated to Composer: take a vault's address and use it as toToken on li.quest/v1/quote.

Endpoint	Purpose
GET /v1/vaults	List vaults — filter by chainId, asset (symbol or address), protocol, minTvlUsd, isTransactional, isRedeemable, isComposerSupported; sort with sortBy=apy|tvl; cursor pagination (limit ≤ 100, follow nextCursor)
GET /v1/vaults/{chainId}/{address}	Single vault detail
GET /v1/chains / GET /v1/protocols	Filter dropdown data (Earn-scoped, not platform-wide)
GET /v1/portfolio/{userAddress}/positions	User's DeFi positions with USD balances

# Top USDC vaults on Base by APY, depositable via Composer
curl "https://earn.li.fi/v1/vaults?chainId=8453&asset=USDC&sortBy=apy&isComposerSupported=true&limit=10" \
  -H "x-lifi-api-key: YOUR_API_KEY"

Gotchas: boolean filters are string literals ("true"/"false"); APY values are decimals (0.0534 = 5.34%); TVL/balances are strings; lpTokens is usually empty — use the vault's top-level address for execution; gate deposit/withdraw UI on isTransactional/isRedeemable; check timeLock, caps, kyc fields. Rate limit: 50 req/min per key. Vault data refreshes every 15 min (transactional flags every 2 min).

Discover → deposit recipe: GET earn.li.fi/v1/vaults → pick vault → GET li.quest/v1/quote with vault address as toToken → approve + send → poll /status.

LI.FI Intents — Solver Marketplace

A separate intent-based system at https://order.li.fi (dev: order-dev.li.fi). Users express desired outcomes; solvers pre-fund delivery on the destination chain against standing quotes. Foundation of the Open Intents Framework. Integrator endpoints need no API key.

Endpoint	Purpose
POST /quote/request	Quote an intent (swapType: exact-input/exact-output); returns quotes[] best-first with quoteId
POST /orders/submit	Off-chain order submission (Compact/gasless flows)
GET /orders/status	By onChainOrderId or catalystOrderId
GET /orders	List/filter orders
GET /chains/supported / GET /routes	Live coverage (EVM + Solana + Tron)

Two funding models:

• Escrow (recommended default): approve → on-chain open(order) on InputSettlerEscrow — no /orders/submit call needed, solvers detect the Open event.
• Compact (gasless): deposit once into The Compact, then sign EIP-712 BatchCompact orders off-chain and submit via /orders/submit.

Order lifecycle: Submitted/Open → Signed → Delivered → Settled (terminal). Refundable after expires if unfilled. Addresses use EIP-7930 interoperable format (chain ID embedded), not bare 0x addresses. Amounts in smallest units. See REFERENCE.md for StandardOrder structs, contract addresses, and signing details.

Note: the classic li.quest/v1/quote already aggregates intent-based bridges (Across, Relay, etc.) — only integrate order.li.fi directly when you want the order-server model itself (solver selection, resource locks, gasless submission).

Token Approvals

• Native token (0x0000…0000) → no approval needed.
• Spender is always quote.estimate.approvalAddress — never hardcode it (it varies by route).
• Check allowance(fromAddress, approvalAddress); if < fromAmount, send approve and wait for confirmation before the main tx, then re-fetch the quote (gas estimates go stale).
• USDT quirk: if current allowance > 0, you must approve(spender, 0) first, then approve the new amount.
• Prefer exact-amount approvals for agents; approval gas ≈ 50–100k.

Status Tracking & Recovery

Poll GET /status with backoff: 10s (first ~6 attempts) → 30s → 60s → 120s. Use estimate.executionDuration from the quote to set expectations. Same-chain swaps are atomic and usually instant.

Result	Action
NOT_FOUND / PENDING	Keep polling (NOT_FOUND just means not indexed yet)
DONE + COMPLETED	Success
DONE + PARTIAL	User received a different token (full value preserved, typically the bridge token on the destination). Optionally recover: quote a same-chain swap from receiving.token to the intended token; skip if gas > ~10% of value
DONE + REFUNDED	Tokens returned on the source chain
FAILED	Permanent — check substatus (SLIPPAGE_EXCEEDED, OUT_OF_GAS, NOT_PROCESSABLE_REFUND_NEEDED, …), inform user

On timeout, never assume failure — save txHash and share lifiExplorerLink (https://explorer.li.fi/tx/<txHash>). Funds are non-custodial and end with the user; prevent PARTIAL by raising slippage for volatile tokens or targeting the bridge's native token directly.

Error Handling

HTTP	Retry?	Action
400	No	Fix parameters
404 / NO_POSSIBLE_ROUTE	Maybe	Different pair/amount/chains; try USDC/USDT/ETH as intermediary
429 (code 1005)	Yes	Exponential backoff min(2^attempt × 1s, 30s)
500/503	Yes (1–2×)	Wait 2–10s, retry

Common API error codes: 1002 NoQuote, 1007 Slippage (raise slippage to min(current×2, 0.03) or lower amount), 1011 Validation. Tool-level codes inside errors[]: NO_POSSIBLE_ROUTE, AMOUNT_TOO_LOW (Composer minimums run higher), INSUFFICIENT_LIQUIDITY, TOOL_TIMEOUT (retry immediately), FEES_HIGHER_THAN_AMOUNT. On execution reverted at send time: the quote was stale — fetch a fresh one (max ~2 retries). Full table in REFERENCE.md.

Integration Examples

Python

import requests

BASE_URL = "https://li.quest/v1"
HEADERS = {"x-lifi-api-key": "YOUR_API_KEY"}  # optional

def get_quote(from_chain, to_chain, from_token, to_token, amount, address, **kwargs):
    params = {
        "fromChain": from_chain, "toChain": to_chain,
        "fromToken": from_token, "toToken": to_token,
        "fromAmount": amount, "fromAddress": address,
        "slippage": 0.005, "integrator": "your-app", **kwargs,
    }
    r = requests.get(f"{BASE_URL}/quote", params=params, headers=HEADERS)
    r.raise_for_status()
    return r.json()

def get_status(tx_hash, from_chain=None, to_chain=None, bridge=None):
    params = {"txHash": tx_hash, "fromChain": from_chain,
              "toChain": to_chain, "bridge": bridge}
    return requests.get(f"{BASE_URL}/status", params=params, headers=HEADERS).json()

# Cross-chain swap quote
quote = get_quote(42161, 10,
    "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",   # USDC.e Arbitrum
    "0xDA10009cBd5D07dd0CeCc66161FC93D7c9000da1",   # DAI Optimism
    "10000000", "0xYourAddress")

# Composer deposit: same call, vault address as toToken
deposit = get_quote(8453, 8453,
    "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",   # USDC Base
    "0x7BfA7C4f149E7415b73bdeDfe609237e29CBF34A",   # Morpho vault
    "100000000", "0xYourAddress")

# transactionRequest values are hex strings — parse before use
tx = quote["transactionRequest"]
gas_limit = int(tx["gasLimit"], 16)

Node.js

const BASE_URL = 'https://li.quest/v1';

async function getQuote(params) {
  const res = await fetch(`${BASE_URL}/quote?${new URLSearchParams(params)}`);
  if (!res.ok) throw new Error(`Quote failed: ${res.status} ${await res.text()}`);
  return res.json();
}

async function pollStatus(txHash, fromChain, toChain, bridge) {
  const params = new URLSearchParams({ txHash, fromChain, toChain, bridge });
  for (let attempt = 0; attempt < 60; attempt++) {
    const data = await (await fetch(`${BASE_URL}/status?${params}`)).json();
    if (data.status === 'DONE' || data.status === 'FAILED') return data;
    const delay = attempt < 6 ? 10_000 : attempt < 12 ? 30_000 : 60_000;
    await new Promise((r) => setTimeout(r, delay));
  }
  throw new Error('Status polling timed out — check explorer.li.fi');
}

// Earn: discover top vaults, then deposit via Composer
const { data: vaults } = await (await fetch(
  'https://earn.li.fi/v1/vaults?chainId=8453&asset=USDC&sortBy=apy&isComposerSupported=true&limit=5'
)).json();
const quote = await getQuote({
  fromChain: 8453, toChain: 8453,
  fromToken: '0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913',
  toToken: vaults[0].address, // vault address triggers Composer
  fromAmount: '100000000',
  fromAddress: '0xYourAddress', toAddress: '0xYourAddress',
});

Best Practices

1. Always pass integrator — required for analytics, fee collection, and fee withdrawal.
2. Re-fetch stale quotes — quotes expire in ~60s; always re-quote after an approval tx.
3. Cache /chains, /tokens, /tools — they change infrequently and polling burns rate limit.
4. Pass fromChain to /status — significantly faster responses.
5. Use preset=stablecoin for stable-to-stable transfers instead of hand-tuning slippage/bridges.
6. Request chainTypes explicitly on /chains if you need non-EVM (default is EVM-only).
7. Amounts are strings in smallest units (human × 10^decimals); transactionRequest.value/gasLimit/gasPrice are hex strings.
8. Handle PARTIAL completions — offer a same-chain recovery swap when worthwhile.
9. For agents: consider the MCP server (https://mcp.li.quest/mcp) or @lifi/cli for token-efficient access; machine-readable docs at https://docs.li.fi/llms.txt and https://docs.li.fi/openapi.yaml (any docs page is fetchable as markdown by appending .md).

See references/REFERENCE.md for complete endpoint documentation, response schemas, the Earn and Intents API references, error codes, chain IDs, and token addresses.