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API (Application Programming Interface) is a channel that allows the copier to communicate with the trading platform. Heron Copier (and most other copier apps) use the API to copy trades. When the API is blocked, the copier (and all other copier apps) will not be able to connect to the trading platform. Here is a list of prop firms that are known to block API access:
Prop FirmPlatform Limitations
FTMOOnly blocks DXtrade accounts
MFFXDXtrade and MatchTrader aren’t working
MavenAll platforms blocked
Alpha Capital GroupMT5 requires autotrading permission, all other platforms blocked
FundingPipsAll platforms except TradeLocker and MT5
Top One TraderAll platforms blocked
The Funded TraderMatchTrader blocked
FundedNextMatchTrader blocked
FXIFYDXtrade blocked
T3X FundingAll platforms blocked
The list may not be exhaustive and there are probably more prop firms that block API access. To work around this issue, you can use the non-API mode of the copier which is available on MatchTrader and DXtrade slave copier apps using the local version of Heron Copier.
Due to the fact that the non-API mode is not using the official API, the non-API mode may not have the same features as the normal API mode.