Regarding the legitimacy of ICAP forex brokers, it provides FCA and WikiBit, (also has a graphic survey regarding security).
Is ICAP safe?
Business
License
FCA Unverified 
Is ICAP markets regulated?
The regulatory license is the strongest proof.
FCA Inst Deriv Trading License (MM)
Financial Conduct Authority
Financial Conduct Authority
Current Status:
UnverifiedLicense Type:
Inst Deriv Trading License (MM)
Licensed Entity:
The Link Asset and Securities Company Limited
Effective Date:
2001-12-01Email Address of Licensed Institution:
marius.floca@tpicap.comSharing Status:
No SharingWebsite of Licensed Institution:
www.linkbrokers.co.ukExpiration Time:
2023-02-07Address of Licensed Institution:
135 Bishopsgate London EC2M 3TP UNITED KINGDOMPhone Number of Licensed Institution:
+4402070005000Licensed Institution Certified Documents:
ICAP Similar Brokers Safe
Whether it is a legitimate broker to see if the market is regulated; start investing in Forex App whether it is safe or a scam, check whether there is a license.
ICAP latest industry rating score is 1.58, the higher the score the safer it is out of 10, the more regulatory licenses the more legitimate it is. 1.58 If the score is too low, there is a risk of being scammed, please pay attention to the choice to avoid.