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LI.FI REST API for cross-chain and same-chain token swaps, bridging, DeFi deposits (Composer), yield discovery (Earn), and intent-based execution (Intents). USE THIS SKILL WHEN USER WANTS TO: - Swap tokens between different blockchains (e.g., "swap USDC on Ethereum to ETH on Arbitrum") - Bridge tokens to another chain (e.g., "move my ETH from mainnet to Optimism") - Swap tokens on the same chain with best rates (e.g., "swap ETH to USDC on Polygon") - Find the best route or quote for a token swa
Passed 22 of 23 test cases with the skill, and 11 of 23 without it.
and 17 more in the full report
11 fixed11 passed either way1 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 11 test cases the skill fixed. Same model, same prompt, with and without the skill.
We want to submit gasless batch orders to a competitive solver marketplace using EIP-712 signatures rather than standard on-chain DEX aggregation. What is the dedicated host for this solver order server, and what address format does it mandate?
| Checked | Without skill | With skill |
|---|---|---|
| Identifies https://order.li.fi as the solver marketplace order server host. | Missed | Passed |
| Explains that account addresses must use EIP-7930 interoperable format containing embedded chain IDs. | Missed | Passed |
The instructions your model reads when the skill loads.
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.
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.
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
test cases passed, vs 11 / 23 without
More skills from the same source and nearby in the registry, with their headline benchmark lift.