Does 0x support testnets?

Short answer: 0x does not support testnets. If you're testing an integration, we recommend using an affordable Layer 2 (L2) like Base instead.

Why no testnet support

If you're testing, we recommend using an affordable L2 like Base. We've moved away from supporting testnets in general because they typically lack liquidity, and there are no canonical token equivalents. This makes aggregation and route generation highly unreliable, in turn the testing experience is subpar.

In other words, because 0x works by aggregating liquidity and generating the best route across many sources, it needs real liquidity and real tokens to function as intended. Testnets don't have those, so testing on one wouldn't reflect how your integration actually behaves in production.

What to use instead

Testing on a low-cost mainnet L2 such as Base gives you realistic liquidity, routing, and execution while keeping gas costs low. For the full list of networks 0x supports, see Supported Chains and Providers.

Helpful references

For a quick reference on endpoints, parameters, and getting started, see the 0x Cheat Sheet.