0x Documentation
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FAQs & Troubleshooting

Categories

🧰 Troubleshooting

Why does my 0x transaction revert?
How does takerAddress help with catching issues?
Why does the value of the to field in the /swap/quote response vary?
0x orders are reverting but my transaction is fine, what is happening?

🔄 0x API Swap

📜 About 0x API

Is there a fee to use the 0x API?
How does 0x API select the best orders for me?
How can I find the 0x API liquidity sources for each chain?
What are the differences when quoting by sellAmount and buyAmount
How does the 0x API decide between the Forwarder and the Exchange?
What is Slippage Protection ?
If the difference between the quoted price and the executed price is positive what happens to the funds? Is positive slippage returned to the user?
Is it possible to use the 0x API to trade custom ERC20 tokens or altcoins?

💻 Parameter Questions

Why does the value of the to field in the /swap/quote response vary?
What is the difference between price and guaranteedPrice?
What are the differences when quoting by sellAmount and buyAmount?
What is slippagePercentage ?
What are the differences when quoting by sellAmount and buyAmount?

🏆 Best Practices

What is the best way to query swap prices for many asset pairs without exceeding the rate limit?
What is the best way to query swap prices for many asset pairs without exceeding the rate limit?
I am building a DEX app using 0x API. Can I charge my users a trading fee/commission fee/transaction fee when using the 0x API?
How is a fee returned by the API - is it part of the quoted price or is it a separate parameter?
How can I find the 0x API liquidity sources for each chain?
How do I query what tokens are available to be swapped through the API?

🌐 Protocol

What is the protocolFee ?
Are the smart contracts audited?
What is the return of executing the provided calldata? fillResults?

📬 Contact the 0x Team

My project would like to integrate the 0x API. How can I contact the 0x team?
My project is interested to apply as a liquidity source in 0x ecosystem. How can I contact the 0x team?