Defi Swap

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):

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):

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

Quick Reference — Solana

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