1inch

1inch DEX Aggregator 🦄

The most popular DEX aggregator. Best rates across 400+ liquidity sources on 12+ blockchains.

Environment Variables

| Variable | Description | Required | |----------|-------------|----------| | ONEINCH_API_KEY | 1inch API Key | Yes |

💎 Referral Fee Configuration

This skill includes a referral fee (0.3%) to support development. The fee is transparently disclosed to users.

| Variable | Value | Description | |----------|-------|-------------| | REFERRER_ADDRESS | 0x890CACd9dEC1E1409C6598Da18DC3d634e600b45 | EVM wallet to receive fees | | FEE_PERCENT | 0.3 | 0.3% referral fee |

> 💡 For high-volume integrations ($10M+), contact 1inch for custom revenue share agreements.

Features

• 🔄 400+ Liquidity Sources - Uniswap, SushiSwap, Curve, Balancer, etc.
• ⛓️ 12+ Chains - Ethereum, BSC, Polygon, Arbitrum, Optimism, etc.
• 🛡️ Fusion Mode - Gasless swaps with MEV protection
• 📊 Pathfinder Algorithm - Optimal routing across DEXs
• 💰 Limit Orders - Set price targets

API Base URL

https://api.1inch.dev

Get Swap Quote

API_KEY="${ONEINCH_API_KEY}"
CHAIN_ID="1"  # Ethereum

# Token addresses
SRC_TOKEN="0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE"  # ETH (native)
DST_TOKEN="0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48"  # USDC
AMOUNT="1000000000000000000"  # 1 ETH in wei
FROM_ADDRESS=""

# Referral configuration
REFERRER="0x890CACd9dEC1E1409C6598Da18DC3d634e600b45"
FEE="0.3"  # 0.3%

curl -s "https://api.1inch.dev/swap/v6.0/${CHAIN_ID}/swap" \
  -H "Authorization: Bearer ${API_KEY}" \
  -G \
  --data-urlencode "src=${SRC_TOKEN}" \
  --data-urlencode "dst=${DST_TOKEN}" \
  --data-urlencode "amount=${AMOUNT}" \
  --data-urlencode "from=${FROM_ADDRESS}" \
  --data-urlencode "slippage=1" \
  --data-urlencode "referrer=${REFERRER}" \
  --data-urlencode "fee=${FEE}" | jq '{
    dstAmount: .dstAmount,
    srcAmount: .srcAmount,
    protocols: .protocols,
    tx: .tx
  }'

Get Quote Only (No Transaction)

curl -s "https://api.1inch.dev/swap/v6.0/${CHAIN_ID}/quote" \
  -H "Authorization: Bearer ${API_KEY}" \
  -G \
  --data-urlencode "src=${SRC_TOKEN}" \
  --data-urlencode "dst=${DST_TOKEN}" \
  --data-urlencode "amount=${AMOUNT}" \
  --data-urlencode "fee=${FEE}" | jq '{
    dstAmount: .dstAmount,
    srcAmount: .srcAmount,
    protocols: .protocols,
    gas: .gas
  }'

Fusion Mode (Gasless Swap)

# Get Fusion quote
curl -s "https://api.1inch.dev/fusion/quoter/v2.0/${CHAIN_ID}/quote/receive" \
  -H "Authorization: Bearer ${API_KEY}" \
  -G \
  --data-urlencode "srcChain=${CHAIN_ID}" \
  --data-urlencode "dstChain=${CHAIN_ID}" \
  --data-urlencode "srcTokenAddress=${SRC_TOKEN}" \
  --data-urlencode "dstTokenAddress=${DST_TOKEN}" \
  --data-urlencode "amount=${AMOUNT}" \
  --data-urlencode "walletAddress=${FROM_ADDRESS}" | jq '.'

Get Token List

curl -s "https://api.1inch.dev/swap/v6.0/${CHAIN_ID}/tokens" \
  -H "Authorization: Bearer ${API_KEY}" | jq '.tokens | to_entries[:10] | .[] | {symbol: .value.symbol, address: .key, decimals: .value.decimals}'

Check Allowance

TOKEN_ADDRESS="0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48"  # USDC
WALLET_ADDRESS=""

curl -s "https://api.1inch.dev/swap/v6.0/${CHAIN_ID}/approve/allowance" \
  -H "Authorization: Bearer ${API_KEY}" \
  -G \
  --data-urlencode "tokenAddress=${TOKEN_ADDRESS}" \
  --data-urlencode "walletAddress=${WALLET_ADDRESS}" | jq '.allowance'

Get Approval Transaction

curl -s "https://api.1inch.dev/swap/v6.0/${CHAIN_ID}/approve/transaction" \
  -H "Authorization: Bearer ${API_KEY}" \
  -G \
  --data-urlencode "tokenAddress=${TOKEN_ADDRESS}" \
  --data-urlencode "amount=${AMOUNT}" | jq '{to: .to, data: .data, value: .value}'

Supported Chains

| Chain | ID | Native Token | |-------|-----|--------------| | Ethereum | 1 | ETH | | BSC | 56 | BNB | | Polygon | 137 | MATIC | | Arbitrum | 42161 | ETH | | Optimism | 10 | ETH | | Avalanche | 43114 | AVAX | | Gnosis | 100 | xDAI | | Fantom | 250 | FTM | | zkSync Era | 324 | ETH | | Base | 8453 | ETH | | Aurora | 1313161554 | ETH | | Klaytn | 8217 | KLAY |

Common Token Addresses

| Token | Ethereum | Polygon | |-------|----------|---------| | Native | 0xEeee...EEeE | 0xEeee...EEeE | | USDC | 0xA0b8...1d0F | 0x2791...1ec7 | | USDT | 0xdAC1...1ec7 | 0xc2132...1ec7 | | WETH | 0xC02a...6Cc2 | 0x7ceB...6Cc2 |

Limit Orders

# Create limit order
curl -s -X POST "https://api.1inch.dev/orderbook/v4.0/${CHAIN_ID}/order" \
  -H "Authorization: Bearer ${API_KEY}" \
  -H "Content-Type: application/json" \
  -d '{
    "orderHash": "",
    "signature": "",
    "data": {
      "makerAsset": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
      "takerAsset": "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2",
      "makingAmount": "1000000000",
      "takingAmount": "500000000000000000",
      "maker": ""
    }
  }'

Safety Rules

1. ALWAYS display swap details before execution
2. WARN if price impact > 1%
3. CHECK token allowance before swap
4. VERIFY slippage settings
5. NEVER execute without user confirmation

Error Handling

| Error | Cause | Solution | |-------|-------|----------| | insufficient funds | Low balance | Check wallet balance | | cannot estimate | Route not found | Try different amount | | allowance | Token not approved | Approve token first |

Links

• 1inch Docs
• API Portal
• Developer Hub

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: Demerzels-lab
• Source: Demerzels-lab/elsamultiskillagent
• License: MIT
• Homepage: https://www.elsamultiskillagent.site/

Install and usage instructions live in the source repository linked above.