okx-dex-quote

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.

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 key
• OKX_SECRET_KEY — Secret key for HMAC signing
• OKX_PASSPHRASE — Account passphrase

Environment

• Python: requests, hmac, hashlib, base64, datetime (all stdlib except requests)
• Node.js: axios or node-fetch, built-in crypto
• No 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:

1. Chain ID (chainIndex) — Must be a supported chain. Common values:

   • 1 = Ethereum
   • 56 = BSC
   • 137 = Polygon
   • 42161 = Arbitrum
   • 8453 = Base
   • 130 = Unichain
   • 501 = Solana

2. Token addresses — Must be valid contract addresses or the native token placeholder:

   • Native tokens (ETH, BNB, etc.): 0xeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
   • Contract tokens: Full 42-character hex address (EVM) or base58 (Solana)

3. 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)

4. Swap mode — exactIn (default) or exactOut

   • exactOut only supported on: Ethereum, Base, BSC, Arbitrum
   • exactOut 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>

Signing algorithm:

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": 
     
  
   

Key fields to extract:

• toTokenAmount — The amount you'll receive (in raw units with decimals)
• tradeFee — Estimated network fee in USD
• priceImpactPercent — Negative = losing value; large negative = danger
• dexRouterList — Routing path through various DEX protocols
• fromToken.isHoneyPot / toToken.isHoneyPot — Scam token flag
• fromToken.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)

Always display:

1. Exchange rate (e.g., "1 ETH = 3,521.43 USDC")
2. Price impact percentage with warning if > 3%
3. Estimated gas fee in USD
4. Routing summary (which DEXes are used)
5. Honeypot warnings if detected
6. 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}"

    # Generate timestamp and signature
    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']}")

     data[][]



ETH = 
USDC = 
amount = ( * **)  

quote = get_okx_quote(, ETH, USDC, amount)

to_decimals = (quote[][])
received = (quote[]) / ( ** to_decimals)

()
()
()
()

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", )
    .(prehash)
    .();

    ( {
     req = https.(
      ,
      {
        : {
          : ,
          : signature,
          : ,
          : timestamp,
        },
      },
       {
         body = ;
        res.(,  (body += chunk));
        res.(,  {
           data = .(body);
           (data. !== ) ( ());
           (data.[]);
        });
      }
    );
    req.(, 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 Unauthorized	Signature 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: true	Scam token detected	Do NOT proceed with the swap. Warn the user immediately.
exactOut not working	Unsupported chain/protocol	Only works on Ethereum, Base, BSC, Arbitrum with Uniswap V2/V3.
taxRate > 0	Token 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-zero	General 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)	0xeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee	18
USDT	0xdac17f958d2ee523a2206206994597c13d831ec7	6
USDC	0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48	6
WETH	0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2	18
WBTC	0x2260fac5e5542a773aa44fbcfedf7c193bc2c599	8
DAI	0x6b175474e89094c44da98b954eedeac495271d0f	18

Reference: Request Parameters Summary

Parameter	Required	Description
chainIndex	Yes	Chain ID (e.g., 1 for Ethereum)
amount	Yes	Amount in raw units (with decimals)
swapMode	Yes	exactIn or exactOut
fromTokenAddress	Yes	Sell token contract address
toTokenAddress	Yes	Buy token contract address
dexIds	No	Comma-separated DEX IDs to restrict routing
directRoute	No	true for single-pool only (Solana only)
priceImpactProtectionPercent	No	Max allowed price impact 0-100 (default 90)
feePercent	No	Commission fee percentage for integrators