The LI.FI Diamond entryway contract address is 0x1231DEB6f5749EF6cE6943a275A1D3E7486F4EaE on most supported networks. Please note, on some networks the address is different. You can find the ABI on Github.
More information and open-source code for each facet contract can be found on our GitHub. Contract address of each facet and deployment information can be found in our GitHub repo.