Okx Dex

OKX DEX Aggregator 🧭

OKX Wallet DEX API provides aggregated swap quotes and transaction data across multiple chains (EVM + non‑EVM).

Environment Variables

API Base URL

https://web3.okx.com

Authentication (Required Headers)

All requests must include the following headers:

• OK-ACCESS-KEY
• OK-ACCESS-TIMESTAMP (UTC ISO time)
• OK-ACCESS-PASSPHRASE
• OK-ACCESS-SIGN (Base64(HMAC_SHA256(prehash, secret)))

Prehash string:

TIMESTAMP + METHOD + REQUEST_PATH_WITH_QUERY + BODY

• For GET requests, BODY is empty and REQUEST_PATH_WITH_QUERY must include the query string.
• For POST requests, BODY is the raw JSON string.

Get Supported Chains (Aggregator)

API_KEY="${OKX_API_KEY}"
SECRET_KEY="${OKX_SECRET_KEY}"
PASSPHRASE="${OKX_PASSPHRASE}"

TIMESTAMP=$(python3 - <<'PY'
from datetime import datetime, timezone
print(datetime.now(timezone.utc).isoformat(timespec='milliseconds').replace('+00:00','Z'))
PY
)

METHOD="GET"
REQUEST_PATH="/api/v6/dex/aggregator/supported/chain"
QUERY="chainIndex=1"
PATH_WITH_QUERY="${REQUEST_PATH}?${QUERY}"

SIGN=$(python3 - <<PY
import hmac, hashlib, base64
import os
msg = f"${TIMESTAMP}${METHOD}${PATH_WITH_QUERY}"
secret = os.environ["SECRET_KEY"].encode()
print(base64.b64encode(hmac.new(secret, msg.encode(), hashlib.sha256).digest()).decode())
PY
)

curl -s "https://web3.okx.com${PATH_WITH_QUERY}" \
  -H "OK-ACCESS-KEY: ${API_KEY}" \
  -H "OK-ACCESS-TIMESTAMP: ${TIMESTAMP}" \
  -H "OK-ACCESS-PASSPHRASE: ${PASSPHRASE}" \
  -H "OK-ACCESS-SIGN: ${SIGN}" | jq '.'

Get Tokens

API_KEY="${OKX_API_KEY}"
SECRET_KEY="${OKX_SECRET_KEY}"
PASSPHRASE="${OKX_PASSPHRASE}"
CHAIN_INDEX="1"  # Ethereum

TIMESTAMP=$(python3 - <<'PY'
from datetime import datetime, timezone
print(datetime.now(timezone.utc).isoformat(timespec='milliseconds').replace('+00:00','Z'))
PY
)

METHOD="GET"
REQUEST_PATH="/api/v6/dex/aggregator/all-tokens"
QUERY="chainIndex=${CHAIN_INDEX}"
PATH_WITH_QUERY="${REQUEST_PATH}?${QUERY}"

SIGN=$(python3 - <<PY
import hmac, hashlib, base64
import os
msg = f"${TIMESTAMP}${METHOD}${PATH_WITH_QUERY}"
secret = os.environ["SECRET_KEY"].encode()
print(base64.b64encode(hmac.new(secret, msg.encode(), hashlib.sha256).digest()).decode())
PY
)

curl -s "https://web3.okx.com${PATH_WITH_QUERY}" \
  -H "OK-ACCESS-KEY: ${API_KEY}" \
  -H "OK-ACCESS-TIMESTAMP: ${TIMESTAMP}" \
  -H "OK-ACCESS-PASSPHRASE: ${PASSPHRASE}" \
  -H "OK-ACCESS-SIGN: ${SIGN}" | jq '.data[:5]'

Get Swap Quote (Quote Only)

API_KEY="${OKX_API_KEY}"
SECRET_KEY="${OKX_SECRET_KEY}"
PASSPHRASE="${OKX_PASSPHRASE}"

CHAIN_INDEX="1"  # Ethereum
FROM_TOKEN="0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE"  # ETH (native)
TO_TOKEN="0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48"    # USDC
AMOUNT="1000000000000000000"  # 1 ETH in wei

TIMESTAMP=$(python3 - <<'PY'
from datetime import datetime, timezone
print(datetime.now(timezone.utc).isoformat(timespec='milliseconds').replace('+00:00','Z'))
PY
)

METHOD="GET"
REQUEST_PATH="/api/v6/dex/aggregator/quote"
QUERY="chainIndex=${CHAIN_INDEX}&fromTokenAddress=${FROM_TOKEN}&toTokenAddress=${TO_TOKEN}&amount=${AMOUNT}&swapMode=exactIn"
PATH_WITH_QUERY="${REQUEST_PATH}?${QUERY}"

SIGN=$(python3 - <<PY
import hmac, hashlib, base64
import os
msg = f"${TIMESTAMP}${METHOD}${PATH_WITH_QUERY}"
secret = os.environ["SECRET_KEY"].encode()
print(base64.b64encode(hmac.new(secret, msg.encode(), hashlib.sha256).digest()).decode())
PY
)

curl -s "https://web3.okx.com${PATH_WITH_QUERY}" \
  -H "OK-ACCESS-KEY: ${API_KEY}" \
  -H "OK-ACCESS-TIMESTAMP: ${TIMESTAMP}" \
  -H "OK-ACCESS-PASSPHRASE: ${PASSPHRASE}" \
  -H "OK-ACCESS-SIGN: ${SIGN}" | jq '{
    fromTokenAmount: .data[0].fromTokenAmount,
    toTokenAmount: .data[0].toTokenAmount,
    tradeFee: .data[0].tradeFee,
    router: .data[0].router
  }'

Get Swap Transaction (Router Call Data)

Note: slippagePercent is required by the swap endpoint and is expressed as a decimal percentage (e.g., 0.01 = 1%).

API_KEY="${OKX_API_KEY}"
SECRET_KEY="${OKX_SECRET_KEY}"
PASSPHRASE="${OKX_PASSPHRASE}"

CHAIN_INDEX="1"  # Ethereum
FROM_TOKEN="0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE"
TO_TOKEN="0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48"
AMOUNT="1000000000000000000"  # 1 ETH in wei
slippagePercent="0.01"  # 1%
WALLET="<YOUR_WALLET_ADDRESS>"

TIMESTAMP=$(python3 - <<'PY'
from datetime import datetime, timezone
print(datetime.now(timezone.utc).isoformat(timespec='milliseconds').replace('+00:00','Z'))
PY
)

METHOD="GET"
REQUEST_PATH="/api/v6/dex/aggregator/swap"
QUERY="chainIndex=${CHAIN_INDEX}&fromTokenAddress=${FROM_TOKEN}&toTokenAddress=${TO_TOKEN}&amount=${AMOUNT}&swapMode=exactIn&slippagePercent=${slippagePercent}&userWalletAddress=${WALLET}"
PATH_WITH_QUERY="${REQUEST_PATH}?${QUERY}"

SIGN=$(python3 - <<PY
import hmac, hashlib, base64
import os
msg = f"${TIMESTAMP}${METHOD}${PATH_WITH_QUERY}"
secret = os.environ["SECRET_KEY"].encode()
print(base64.b64encode(hmac.new(secret, msg.encode(), hashlib.sha256).digest()).decode())
PY
)

curl -s "https://web3.okx.com${PATH_WITH_QUERY}" \
  -H "OK-ACCESS-KEY: ${API_KEY}" \
  -H "OK-ACCESS-TIMESTAMP: ${TIMESTAMP}" \
  -H "OK-ACCESS-PASSPHRASE: ${PASSPHRASE}" \
  -H "OK-ACCESS-SIGN: ${SIGN}" | jq '{
    tx: .data[0].tx,
    router: .data[0].routerResult.router,
    priceImpactPercent: .data[0].routerResult.priceImpactPercent,
    dexRouterList: (.data[0].routerResult.dexRouterList // [])
  }'

Get Approval Transaction (EVM)

Note: Some responses may omit to/value. If to is null, use the chain's dexTokenApproveAddress from the Supported Chains response as the target.

API_KEY="${OKX_API_KEY}"
SECRET_KEY="${OKX_SECRET_KEY}"
PASSPHRASE="${OKX_PASSPHRASE}"

CHAIN_INDEX="1"  # Ethereum
TOKEN_ADDRESS="0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48"  # USDC
AMOUNT="1000000000"  # 1,000,000 USDC (6 decimals)

TIMESTAMP=$(python3 - <<'PY'
from datetime import datetime, timezone
print(datetime.now(timezone.utc).isoformat(timespec='milliseconds').replace('+00:00','Z'))
PY
)

METHOD="GET"
REQUEST_PATH="/api/v6/dex/aggregator/approve-transaction"
QUERY="chainIndex=${CHAIN_INDEX}&tokenContractAddress=${TOKEN_ADDRESS}&approveAmount=${AMOUNT}"
PATH_WITH_QUERY="${REQUEST_PATH}?${QUERY}"

SIGN=$(python3 - <<PY
import hmac, hashlib, base64
import os
msg = f"${TIMESTAMP}${METHOD}${PATH_WITH_QUERY}"
secret = os.environ["SECRET_KEY"].encode()
print(base64.b64encode(hmac.new(secret, msg.encode(), hashlib.sha256).digest()).decode())
PY
)

curl -s "https://web3.okx.com${PATH_WITH_QUERY}" \
  -H "OK-ACCESS-KEY: ${API_KEY}" \
  -H "OK-ACCESS-TIMESTAMP: ${TIMESTAMP}" \
  -H "OK-ACCESS-PASSPHRASE: ${PASSPHRASE}" \
  -H "OK-ACCESS-SIGN: ${SIGN}" | jq '{
    data: .data[0].data,
    dexContractAddress: .data[0].dexContractAddress,
    gasLimit: .data[0].gasLimit,
    gasPrice: .data[0].gasPrice
  }'

Get Approval Transaction (EVM) with to from Supported Chains

API_KEY="${OKX_API_KEY}"
PASSPHRASE="${OKX_PASSPHRASE}"

CHAIN_INDEX="1"  # Ethereum
TOKEN_ADDRESS="0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48"  # USDC
AMOUNT="1000000000"  # 1,000,000 USDC (6 decimals)

TIMESTAMP=$(python3 - <<'PY'
from datetime import datetime, timezone
print(datetime.now(timezone.utc).isoformat(timespec='milliseconds').replace('+00:00','Z'))
PY
)

METHOD="GET"
REQUEST_PATH="/api/v6/dex/aggregator/supported/chain"
QUERY="chainIndex=${CHAIN_INDEX}"
PATH_WITH_QUERY="${REQUEST_PATH}?${QUERY}"

SIGN=$(python3 - <<PY
import hmac, hashlib, base64
import os
msg = f"${TIMESTAMP}${METHOD}${PATH_WITH_QUERY}"
secret = os.environ["OKX_SECRET_KEY"].encode()
print(base64.b64encode(hmac.new(secret, msg.encode(), hashlib.sha256).digest()).decode())
PY
)

APPROVE_TO=$(curl -s "https://web3.okx.com${PATH_WITH_QUERY}" \
  -H "OK-ACCESS-KEY: ${API_KEY}" \
  -H "OK-ACCESS-TIMESTAMP: ${TIMESTAMP}" \
  -H "OK-ACCESS-PASSPHRASE: ${PASSPHRASE}" \
  -H "OK-ACCESS-SIGN: ${SIGN}" | jq -r '.data[0].dexTokenApproveAddress')

TIMESTAMP=$(python3 - <<'PY'
from datetime import datetime, timezone
print(datetime.now(timezone.utc).isoformat(timespec='milliseconds').replace('+00:00','Z'))
PY
)

METHOD="GET"
REQUEST_PATH="/api/v6/dex/aggregator/approve-transaction"
QUERY="chainIndex=${CHAIN_INDEX}&tokenContractAddress=${TOKEN_ADDRESS}&approveAmount=${AMOUNT}"
PATH_WITH_QUERY="${REQUEST_PATH}?${QUERY}"

SIGN=$(python3 - <<PY
import hmac, hashlib, base64
import os
msg = f"${TIMESTAMP}${METHOD}${PATH_WITH_QUERY}"
secret = os.environ["OKX_SECRET_KEY"].encode()
print(base64.b64encode(hmac.new(secret, msg.encode(), hashlib.sha256).digest()).decode())
PY
)

curl -s "https://web3.okx.com${PATH_WITH_QUERY}" \
  -H "OK-ACCESS-KEY: ${API_KEY}" \
  -H "OK-ACCESS-TIMESTAMP: ${TIMESTAMP}" \
  -H "OK-ACCESS-PASSPHRASE: ${PASSPHRASE}" \
  -H "OK-ACCESS-SIGN: ${SIGN}" | jq --arg to "${APPROVE_TO}" '{
    data: .data[0].data,
    dexContractAddress: (.data[0].dexContractAddress // $to),
    gasLimit: .data[0].gasLimit,
    gasPrice: .data[0].gasPrice
  }'

Safety Rules

1. ALWAYS display swap details before execution.
2. WARN if price impact is high or priceImpactProtectionPercent is exceeded.
3. CHECK token allowance (EVM) before swap execution.
4. VERIFY slippage settings (slippagePercent).
5. For approve responses, if to is null, use dexTokenApproveAddress for the chain.
6. NEVER execute without explicit user confirmation.

Links

• OKX DEX API Reference (v6)