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Development Status

Current Status

Tx Relay API is supported on the following chains via https://api.0x.org/. Select the chain in your request by providing the corresponding chain id with the 0x-chain-id header.

ChainChain ID
Ethereum (Mainnet)1
Polygon137
Arbitrum42161
Base8453
Optimism10

Read more accessing the API endpoints.

info

To create an account, and get your live API keys to access the Tx Relay, visit the 0x Dashboard.

Tx Relay allows you to implement:

  • Gasless Approvals
  • Gasless Swaps
  • Setting & Collecting fees

Integrators are encouraged to experiment with Tx Relay API on Polygon or Arbitrum first where fees are low.