| name | defi-swap |
| description | Get DEX swap quotes, price routes, and trade execution data across multiple chains. Use when asked about swapping tokens, best swap price, DEX aggregator quotes, token swap routes, trading on Uniswap/Jupiter/ParaSwap/1inch, slippage, or comparing swap rates across DEXes.
|
DeFi Swap
DEX swap quotes and routing across EVM chains and Solana using free aggregator APIs.
APIs
ParaSwap (Free, no auth)
Base: https://api.paraswap.io
Get swap quote (prices only, no tx data):
web_fetch url="https://api.paraswap.io/prices?srcToken=0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE&destToken=0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48&amount=1000000000000000000&srcDecimals=18&destDecimals=6&side=SELL&network=1"
Get transaction data (for execution):
exec command="curl -s -X POST 'https://api.paraswap.io/transactions/1' -H 'Content-Type: application/json' -d '{\"srcToken\":\"0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE\",\"destToken\":\"0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48\",\"srcAmount\":\"1000000000000000000\",\"slippage\":100,\"userAddress\":\"0xUSER\",\"priceRoute\":PRICE_ROUTE_FROM_ABOVE}'"
Supported chains (network IDs):
| Chain | ID | Chain | ID |
|---|
| Ethereum | 1 | Arbitrum | 42161 |
| Optimism | 10 | Base | 8453 |
| Polygon | 137 | BSC | 56 |
| Avalanche | 43114 | Fantom | 250 |
Native token address (all EVM): 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE
Jupiter / Solana (Free, no auth)
Base: https://quote-api.jup.ag/v6
Get swap quote:
web_fetch url="https://quote-api.jup.ag/v6/quote?inputMint=So11111111111111111111111111111111111111112&outputMint=EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v&amount=1000000000&slippageBps=50"
Get swap transaction (for execution):
exec command="curl -s -X POST 'https://quote-api.jup.ag/v6/swap' -H 'Content-Type: application/json' -d '{\"quoteResponse\":QUOTE_FROM_ABOVE,\"userPublicKey\":\"USER_PUBKEY\",\"wrapAndUnwrapSol\":true}'"
Token list (for mint address lookup):
web_fetch url="https://token.jup.ag/strict"
Uniswap Trading API (Requires API key)
Base: https://trade-api.gateway.uniswap.org/v1
Requires header x-api-key: YOUR_API_KEY — get one at https://developers.uniswap.org/dashboard/
Check token approval:
exec command="curl -s -X POST 'https://trade-api.gateway.uniswap.org/v1/check_approval' -H 'Content-Type: application/json' -H 'x-api-key: YOUR_API_KEY' -d '{\"walletAddress\":\"0xUSER\",\"token\":\"0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48\",\"amount\":\"1000000000\",\"chainId\":1}'"
Get swap quote:
exec command="curl -s -X POST 'https://trade-api.gateway.uniswap.org/v1/quote' -H 'Content-Type: application/json' -H 'x-api-key: YOUR_API_KEY' -d '{\"type\":\"EXACT_INPUT\",\"amount\":\"1000000000000000000\",\"tokenIn\":\"0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE\",\"tokenOut\":\"0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48\",\"tokenInChainId\":1,\"tokenOutChainId\":1,\"swapper\":\"0xUSER\",\"slippageTolerance\":0.5}'"
Execute swap (gasful, on-chain):
exec command="curl -s -X POST 'https://trade-api.gateway.uniswap.org/v1/swap' -H 'Content-Type: application/json' -H 'x-api-key: YOUR_API_KEY' -d '{\"quote\":QUOTE_FROM_ABOVE,\"signature\":\"0xSIGNED_PERMIT2\",\"permitData\":PERMIT_DATA_FROM_QUOTE}'"
Execute swap (gasless, UniswapX):
exec command="curl -s -X POST 'https://trade-api.gateway.uniswap.org/v1/order' -H 'Content-Type: application/json' -H 'x-api-key: YOUR_API_KEY' -d '{\"quote\":QUOTE_FROM_ABOVE,\"signature\":\"0xSIGNED_ORDER\"}'"
Check swap status:
web_fetch url="https://trade-api.gateway.uniswap.org/v1/swaps?txHash=0xTX_HASH" headers="x-api-key: YOUR_API_KEY"
Supported chains (17+ mainnets):
| Chain | ID | Chain | ID |
|---|
| Ethereum | 1 | Arbitrum | 42161 |
| Optimism | 10 | Base | 8453 |
| Polygon | 137 | BSC | 56 |
| Avalanche | 43114 | zkSync | 324 |
| Blast | 81457 | Zora | 7777777 |
| Unichain | 130 | Celo | 42220 |
| Linea | 59144 | World Chain | 480 |
UniswapX gasless swaps available on: Ethereum (1), Arbitrum (42161), Base (8453), Unichain (130).
Native token address: 0x0000000000000000000000000000000000000000
1inch (Requires API key)
Base: https://api.1inch.dev/swap/v6.0/{chainId}
Get quote:
web_fetch url="https://api.1inch.dev/swap/v6.0/1/quote?src=0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE&dst=0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48&amount=1000000000000000000"
Requires header Authorization: Bearer YOUR_API_KEY
0x / Matcha (Requires API key)
Get quote:
web_fetch url="https://api.0x.org/swap/v1/quote?buyToken=USDC&sellToken=ETH&sellAmount=1000000000000000000"
Requires header 0x-api-key: YOUR_KEY
Common Token Addresses
See references/evm-tokens.md and references/solana-tokens.md for full lists.
Quick Reference — Ethereum Mainnet
| Token | Address |
|---|
| WETH | 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2 |
| USDC | 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 |
| USDT | 0xdAC17F958D2ee523a2206206994597C13D831ec7 |
| DAI | 0x6B175474E89094C44Da98b954EedeAC495271d0F |
| WBTC | 0x2260FAC5E5542a773Aa44fBCfeDf7C193bc2C599 |
Quick Reference — Solana
| Token | Mint |
|---|
| SOL (wrapped) | So11111111111111111111111111111111111111112 |
| USDC | EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v |
| USDT | Es9vMFrzaCERmJfrF4H2FYD4KCoNkY11McCe8BenwNYB |
External Tools (Optional)
- EVM MCP Server:
npx @mcpdotdirect/evm-mcp-server — swap execution across 60+ EVM chains
- Solana Agent Kit:
github.com/sendaifun/solana-mcp — Solana swap execution via Jupiter
Usage Tips
- Always quote amounts in smallest unit (wei for ETH = 10^18, lamports for SOL = 10^9)
slippage in ParaSwap is basis points (100 = 1%). Jupiter uses slippageBps.- ParaSwap is best free option for EVM; Jupiter is best for Solana
- For price-only queries, use quote endpoints (no tx data needed)
- Compare ParaSwap vs 1inch quotes for best execution on large trades
- Native token address
0xEeee... is the same across all EVM chains in ParaSwap
