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Darwinex seems interesting.
https://blog.darwinex.com/fix-api-trading/

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We offer the package for a one-off fee of USD 500 and a minimum overall deposit of USD 5000 due to the fact that this is a non-standard set-up which incurs additional support costs for us. Furthermore, we reserve the right to evaluate each application on a case by case basis.
I'm not sure why they need $500 USD for access to a server that's probably up and running.