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okx-dex-quote Fetch optimal swap quotes from OKX DEX Aggregator API (v6). Use this skill when a user wants to: 1. Get the best price for swapping tokens on any supported EVM/Solana chain 2. Compare DEX routing paths and price impact for token swaps 3. Build applications or scripts that query real-time DEX aggregator pricing Core value: Generates correct, authenticated API calls with proper token decimals, amount formatting, HMAC-SHA256 signing, and comprehensive error handling.
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GitHub リポジトリを開く name okx-dex-quote description Fetch optimal swap quotes from OKX DEX Aggregator API (v6). Use this skill when a user wants to: 1. Get the best price for swapping tokens on any supported EVM/Solana chain 2. Compare DEX routing paths and price impact for token swaps 3. Build applications or scripts that query real-time DEX aggregator pricing Core value: Generates correct, authenticated API calls with proper token decimals, amount formatting, HMAC-SHA256 signing, and comprehensive error handling.
version 1.0.0 allowed_tools ["bash_tool","create_file","str_replace","view"] required_context ["api_key","secret_key","passphrase"] license MIT author Claude Assistant tags ["defi","dex","okx","swap","quote","web3","aggregator","evm","solana"]
OKX DEX Aggregator Quote Skill
Overview
This skill generates production-ready code for fetching optimal swap quotes from the OKX DEX Aggregator API v6 . The API finds the best price across multiple DEX protocols (Uniswap, SushiSwap, Curve, etc.) and returns detailed routing information including price impact, gas estimates, and token safety flags.
Key capabilities:
Authenticated API requests with HMAC-SHA256 signing
Correct handling of token decimals and amount formatting
Support for exactIn (fixed input) and exactOut (fixed output) swap modes
Multi-chain support (Ethereum, BSC, Arbitrum, Base, Solana, and 20+ chains)
Price impact protection and honeypot detection
Fee/commission splitting configuration
Prerequisites
Required Credentials
Users must have an OKX Web3 API key set. The skill needs three values:
OKX_ACCESS_KEY — API keyOKX_SECRET_KEY — Secret key for HMAC signingOKX_PASSPHRASE — Account passphrase
Environment
Python : requests, hmac, hashlib, base64, datetime (all stdlib except requests)Node.js : axios or node-fetch, built-in cryptoNo additional blockchain dependencies required (this is a read-only quote endpoint)
API Endpoint
GET https://web3.okx.com/api/v6/dex/aggregator/quote
Workflow
Step 1: Validate User Input
Before constructing the API call, validate:
Chain ID (chainIndex) — Must be a supported chain. Common values:
1 = Ethereum56 = BSC137 = Polygon42161 = Arbitrum8453 = Base130 = Unichain501 = Solana
Token addresses
Native tokens (ETH, BNB, etc.): 0xeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
Contract tokens: Full 42-character hex address (EVM) or base58 (Solana)
Amount — MUST include token decimals. This is the #1 source of errors:
1 ETH (18 decimals) → "1000000000000000000"
1 USDT (6 decimals) → "1000000"
1 WBTC (8 decimals) → "100000000"
Formula: amount_raw = human_amount * (10 ** token_decimals)
Swap mode — exactIn (default) or exactOut
exactOut only supported on: Ethereum, Base, BSC, ArbitrumexactOut only works with Uniswap V2/V3 pools
Step 2: Construct Authentication Headers OKX API requires HMAC-SHA256 signed requests with 4 headers:
OK-ACCESS-KEY: <api_key>
OK-ACCESS-SIGN: <hmac_signature>
OK-ACCESS-PASSPHRASE: <passphrase>
OK-ACCESS-TIMESTAMP: <iso8601_timestamp>
timestamp = ISO 8601 UTC time (e.g., "2025-01-15T12:00:00.000Z")
prehash = timestamp + "GET" + request_path_with_query
signature = Base64(HMAC-SHA256(secret_key, prehash))
CRITICAL : The request_path_with_query must include the full path starting from /api/... plus the query string. Example:
/api/v6/dex/aggregator/quote?chainIndex=1&amount=1000000000000000000&fromTokenAddress=0xeee...&toTokenAddress=0xa0b...
Step 3: Send Request and Parse Response Success response structure:
{
"code" : "0" ,
"data" : [ {
"chainIndex" : "1" ,
"fromToken" : { "tokenSymbol" : "ETH" , "decimal" : "18" , ... } ,
"toToken" : { "tokenSymbol" : "USDC" , "decimal" : "6" , ... } ,
"fromTokenAmount" : "1000000000000000000" ,
"toTokenAmount" : "3521432100" ,
"dexRouterList" : [ ...] ,
"tradeFee" : "2.45" ,
"estimateGasFee" : "150000" ,
"priceImpactPercent" : "-0.12"
} ] ,
"msg" : ""
}
toTokenAmount — The amount you'll receive (in raw units with decimals)tradeFee — Estimated network fee in USDpriceImpactPercent — Negative = losing value; large negative = dangerdexRouterList — Routing path through various DEX protocolsfromToken.isHoneyPot / toToken.isHoneyPot — Scam token flagfromToken.taxRate / toToken.taxRate — Token buy/sell tax
Step 4: Format Output for User Convert raw amounts back to human-readable:
human_amount = raw_amount / (10 ** decimal)
Exchange rate (e.g., "1 ETH = 3,521.43 USDC")
Price impact percentage with warning if > 3%
Estimated gas fee in USD
Routing summary (which DEXes are used)
Honeypot warnings if detected
Token tax rates if > 0
Best Practices
Security
NEVER hardcode API credentials in generated code. Always use environment variables or config files.NEVER log the secret key or signature in debug output.Validate all token addresses against expected format before sending.
Check isHoneyPot flag on both tokens and warn the user prominently.
Amount Handling
Always use string type for amounts to avoid floating-point precision loss.Python: Use int() for amount calculations, never float().
JavaScript: Use BigInt or string math for amounts > 2^53.
When user provides a human-readable amount like "1.5 ETH", convert: str(int(1.5 * 10**18)).
Error Handling
Check response["code"] == "0" before accessing data.
Common error codes:
Non-zero code with msg = API error (e.g., insufficient liquidity, invalid params)
HTTP 401 = Authentication failure (check signature algorithm)
HTTP 429 = Rate limited
If priceImpactPercent is null, warn that price impact couldn't be calculated.
Rate Limits
Respect OKX rate limits. For production use, implement exponential backoff.
Cache quotes if polling repeatedly (quotes are valid for ~15-30 seconds).
Optional Parameters Usage
dexIds — Use when you want to restrict to specific DEXes (e.g., only Uniswap).directRoute=true — Only for Solana; forces single-pool routing.priceImpactProtectionPercent — Set to a sensible default like 10 for safety. Set to 100 to disable.feePercent — For integrators taking commission. Max 3% (EVM) or 10% (Solana). Up to 9 decimal places.
Examples
Example 1: Python — Get ETH to USDC Quote on Ethereum import os, hmac, hashlib, base64, requests
from datetime import datetime, timezone
from urllib.parse import urlencode
API_KEY = os.environ["OKX_ACCESS_KEY" ]
SECRET_KEY = os.environ["OKX_SECRET_KEY" ]
PASSPHRASE = os.environ["OKX_PASSPHRASE" ]
def get_okx_quote (chain_index, from_token, to_token, amount, swap_mode="exactIn" ):
base_url = "https://web3.okx.com"
path = "/api/v6/dex/aggregator/quote"
params = {
"chainIndex" : chain_index,
"fromTokenAddress" : from_token,
"toTokenAddress" : to_token,
"amount" : amount,
"swapMode" : swap_mode,
}
query_string = urlencode(params)
request_path = f"{path} ?{query_string} "
timestamp = datetime.now(timezone.utc).strftime("%Y-%m-%dT%H:%M:%S.%f" )[:-3 ] + "Z"
prehash = timestamp + "GET" + request_path
signature = base64.b64encode(
hmac.new(SECRET_KEY.encode(), prehash.encode(), hashlib.sha256).digest()
).decode()
headers = {
"OK-ACCESS-KEY" : API_KEY,
"OK-ACCESS-SIGN" : signature,
"OK-ACCESS-PASSPHRASE" : PASSPHRASE,
"OK-ACCESS-TIMESTAMP" : timestamp,
}
resp = requests.get(base_url + request_path, headers=headers)
resp.raise_for_status()
data = resp.json()
if data["code" ] != "0" :
raise Exception(f"OKX API error: {data['msg' ]} " )
return data["data" ][0 ]
ETH = "0xeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee"
USDC = "0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48"
amount = str (1 * 10 **18 )
quote = get_okx_quote("1" , ETH, USDC, amount)
to_decimals = int (quote["toToken" ]["decimal" ])
received = int (quote["toTokenAmount" ]) / (10 ** to_decimals)
print (f"You will receive: {received:,.2 f} {quote['toToken' ]['tokenSymbol' ]} " )
print (f"Price impact: {quote['priceImpactPercent' ]} %" )
print (f"Gas fee (USD): ${quote['tradeFee' ]} " )
print (f"Honeypot check: {'WARNING' if quote['toToken' ]['isHoneyPot' ] else 'Safe' } " )
Example 2: Node.js — Get Quote with Commission Fee const crypto = require ("crypto" );
const https = require ("https" );
const API_KEY = process.env .OKX_ACCESS_KEY ;
const SECRET_KEY = process.env .OKX_SECRET_KEY ;
const PASSPHRASE = process.env .OKX_PASSPHRASE ;
function getQuote (chainIndex, fromToken, toToken, amount, options = {} ) {
const params = new URLSearchParams ({
chainIndex,
fromTokenAddress : fromToken,
toTokenAddress : toToken,
amount,
swapMode : options.swapMode || "exactIn" ,
...(options.feePercent && { feePercent : options.feePercent }),
...(options.priceImpactProtectionPercent && {
priceImpactProtectionPercent : options.priceImpactProtectionPercent ,
}),
});
const path = `/api/v6/dex/aggregator/quote?${params} ` ;
const timestamp = new Date ().toISOString ();
const prehash = timestamp + "GET" + path;
const signature = crypto
.createHmac ("sha256" , SECRET_KEY )
.update (prehash)
.digest ("base64" );
return new Promise ((resolve, reject ) => {
const req = https.get (
`https://web3.okx.com${path} ` ,
{
headers : {
"OK-ACCESS-KEY" : API_KEY ,
"OK-ACCESS-SIGN" : signature,
"OK-ACCESS-PASSPHRASE" : PASSPHRASE ,
"OK-ACCESS-TIMESTAMP" : timestamp,
},
},
(res ) => {
let body = "" ;
res.on ("data" , (chunk ) => (body += chunk));
res.on ("end" , () => {
const data = JSON .parse (body);
if (data.code !== "0" ) reject (new Error (`OKX: ${data.msg} ` ));
else resolve (data.data [0 ]);
});
}
);
req.on ("error" , reject);
});
}
Example 3: Understanding the Routing Path Router: ETH -> WBTC -> USDC
dexRouterList shows:
- 55% ETH -> WBTC via Uniswap V4
- 30% ETH -> USDC via Uniswap V4 (direct)
- WBTC -> USDC via Euler (73%) + Uniswap V4 (27%)
This means the aggregator splits the trade across multiple paths
to minimize price impact and maximize output.
Troubleshooting Problem Cause Solution 401 UnauthorizedSignature mismatch Verify prehash string is exactly timestamp + "GET" + full_path_with_query. Check secret key encoding. Amount too small Missing decimal conversion Multiply human amount by 10 ** token_decimals. 1 USDT = 1000000, not 1. Invalid token address Wrong chain/address combo Verify the token exists on the specified chain. Use native token placeholder for ETH/BNB/etc. priceImpactPercent very negative (< -10%)Low liquidity or large trade Reduce trade size or split across multiple transactions. isHoneyPot: trueScam token detected Do NOT proceed with the swap. Warn the user immediately.exactOut not workingUnsupported chain/protocol Only works on Ethereum, Base, BSC, Arbitrum with Uniswap V2/V3. taxRate > 0Token has built-in tax Factor tax into expected output. E.g., 5% tax means receiving 5% less. Empty dexRouterList No liquidity path found Try a different token pair, smaller amount, or different chain. code is non-zeroGeneral API error Read msg field for details. Common: rate limit, maintenance, invalid params.
Reference: Common Chain IDs Chain chainIndex Ethereum 1 BSC 56 Polygon 137 Arbitrum 42161 Optimism 10 Avalanche 43114 Base 8453 Solana 501 Unichain 130
Reference: Common Token Addresses (Ethereum) Token Address Decimals ETH (native) 0xeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee18 USDT 0xdac17f958d2ee523a2206206994597c13d831ec76 USDC 0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb486 WETH 0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc218 WBTC 0x2260fac5e5542a773aa44fbcfedf7c193bc2c5998 DAI 0x6b175474e89094c44da98b954eedeac495271d0f18
Reference: Request Parameters Summary Parameter Required Description chainIndexYes Chain ID (e.g., 1 for Ethereum) amountYes Amount in raw units (with decimals) swapModeYes exactIn or exactOutfromTokenAddressYes Sell token contract address toTokenAddressYes Buy token contract address dexIdsNo Comma-separated DEX IDs to restrict routing directRouteNo true for single-pool only (Solana only)priceImpactProtectionPercentNo Max allowed price impact 0-100 (default 90) feePercentNo Commission fee percentage for integrators
