# 🤝🏻 Cooperation-API:🕹Integrate GMGN ETH/Base/BSC Trading API ✅ Approved: API Key sent to your email\ ❌ Rejected: No notification sent #### Authentication * GMGN provides professional users with SOL/BSC/Base/ETH Trading API. Access is granted solely based on sufficient **Trading Volume** on GMGN. Review will be completed within 24 hours after submission * To access the GMGN Trade API, apply for permission by filling out the following Google Form: * Upon approval, GMGN will issue an API Key to your email. Include the API Key in the request header with the name: `x-route-key` * Each API Key is rate-limited to one call every 5 seconds **ETH/Base chain Swap transaction steps:** 1. **Get the transaction route, recommended slippage, and recommended gas price at the same time** * Get transaction routing: [Get the available routing for ETH/Base transactions](https://docs.gmgn.ai/index/cooperation-api-integrate-gmgn-eth-base-bsc-trading-api/get-the-available-routing-for-eth-base-bsc-transactions) * Get recommended slippage: [Get the recommended slippage value of ETH/Base token](https://docs.gmgn.ai/index/cooperation-api-integrate-gmgn-eth-base-bsc-trading-api/get-the-recommended-slippage-value-of-eth-base-bsc-token) * Get recommended gas price: [Get the recommended gas price for ETH/Base chain](https://docs.gmgn.ai/index/cooperation-api-integrate-gmgn-eth-base-bsc-trading-api/get-the-recommended-gas-price-for-eth-base-bsc-chain) 2. **After selecting the route, call the simulated transaction** [💻Swap transaction simulation (ETH/Base)](https://docs.gmgn.ai/index/cooperation-api-integrate-gmgn-eth-base-bsc-trading-api/swap-transaction-simulation-eth-base-bsc) 3. **After the simulated transaction is passed, get the returned data field and use normal rpc or anti-pinch rpc to submit the formal transaction** Submit transaction signature, you can use ethers js library Signature transaction tutorial Ethers js library