This information can be found in our reference data endpoints. Specifically you can specify a UIC and an AssetType and query GET /ref/v1/instruments/details/{Uic}/{AssetType}. In the response you will the field SupportedOrderTypes that will hold information on what order types are supported for that particular instruments:
{
...
"AssetType": "FxSpot",
...
"SupportedOrderTypes": [
"Market",
"Limit",
"Stop",
"TrailingStop",
"StopLimit"
],
...
"Symbol": "GBPAUD",
"Uic": 22
}
In this example the supported order types are Market, Limit, Stop, TrailingStop and StopLimit.
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