Provide available capital to api

freqtrade/rpc/api_server/api_schemas.py

@@ -115,6 +115,7 @@ class ShowConfig(BaseModel):
     dry_run: bool
     stake_currency: str
     stake_amount: Union[float, str]
+    available_capital: Optional[float]
     stake_currency_decimals: int
     max_open_trades: int
     minimal_roi: Dict[str, Any]

freqtrade/rpc/rpc.py

@@ -106,6 +106,7 @@ class RPC:
             'stake_currency': config['stake_currency'],
             'stake_currency_decimals':  decimals_per_coin(config['stake_currency']),
             'stake_amount': config['stake_amount'],
+            'available_capital': config.get('available_capital'),
             'max_open_trades': (config['max_open_trades']
                                 if config['max_open_trades'] != float('inf') else -1),
             'minimal_roi': config['minimal_roi'].copy() if 'minimal_roi' in config else {},