The best alternatives to Knot API are Stripe, Truebill Budget & Bill Tracker, and Trim. If these 3 options don't work for you, we've listed a few more alternatives below.
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Outerbridge is an open-source low-code/no-code workflow automation application, focusing on integrating on-chain (Web3) and off-chain (Web2) applications. It is free to self-host and easily extensible to build your own custom integrations.