Sources define a start date and price types.

src/pricehist/cli.py

@@ -65,6 +65,8 @@ def cmd_source(args):
         print_field("Name", source.name(), key_width, output_width)
         print_field("Description", source.description(), key_width, output_width)
         print_field("URL", source.source_url(), key_width, output_width, force=False)
+        print_field("Start", source.start(), key_width, output_width)
+        print_field("Types", ", ".join(source.types()), key_width, output_width)
         print_field("Notes", source.notes(), key_width, output_width)
 
 

src/pricehist/sources/coindesk.py

@@ -26,6 +26,14 @@ class CoinDesk:
     def source_url():
         return "https://www.coindesk.com/coindesk-api"
 
+    @staticmethod
+    def start():
+        return "2010-07-17"
+
+    @staticmethod
+    def types():
+        return []
+
     @staticmethod
     def notes():
         return ""
@@ -43,7 +51,7 @@ class CoinDesk:
     def fetch(self, pair, type, start, end):
         base, quote = pair.split("/")
 
-        min_start = "2010-07-17"
+        min_start = self.start()
         if start < min_start:
             exit(
                 f"start {start} too early. The CoinDesk BPI only covers data"

src/pricehist/sources/coinmarketcap.py

@@ -24,6 +24,14 @@ class CoinMarketCap:
     def source_url():
         return "https://coinmarketcap.com/"
 
+    @staticmethod
+    def start():
+        return "2013-04-28"
+
+    @staticmethod
+    def types():
+        return ["mid", "open", "high", "low", "close"]
+
     @staticmethod
     def notes():
         return (

src/pricehist/sources/ecb.py

@@ -25,6 +25,14 @@ class ECB:
     def source_url():
         return "https://www.ecb.europa.eu/stats/exchange/eurofxref/html/index.en.html"
 
+    @staticmethod
+    def start():
+        return "1999-01-04"
+
+    @staticmethod
+    def types():
+        return []
+
     @staticmethod
     def notes():
         return ""
@@ -41,7 +49,7 @@ class ECB:
     def fetch(self, pair, type, start, end):
         base, quote = pair.split("/")
 
-        min_start = "1999-01-04"
+        min_start = self.start()
         if start < min_start:
             exit(f"start {start} too early. Minimum is {min_start}")