diff --git a/src/pricehist/fetch.py b/src/pricehist/fetch.py
index f57f21b..e1cc341 100644
--- a/src/pricehist/fetch.py
+++ b/src/pricehist/fetch.py
@@ -1,6 +1,9 @@
 import logging
+import sys
 from datetime import date, datetime, timedelta
 
+from pricehist import exceptions
+
 
 def fetch(series, source, output, invert: bool, quantize: int, fmt) -> str:
     if series.start < source.start():
@@ -9,7 +12,12 @@ def fetch(series, source, output, invert: bool, quantize: int, fmt) -> str:
             f"source start date of {source.start()}."
         )
 
-    series = source.fetch(series)
+    try:
+        series = source.fetch(series)
+    except exceptions.SourceError as e:
+        logging.debug("Critical exception encountered", exc_info=e)
+        logging.critical(str(e))
+        sys.exit(1)
 
     if len(series.prices) == 0:
         logging.warn(f"No data found for the interval [{series.start}--{series.end}].")
diff --git a/src/pricehist/logger.py b/src/pricehist/logger.py
index 648598f..3a6143f 100644
--- a/src/pricehist/logger.py
+++ b/src/pricehist/logger.py
@@ -4,11 +4,18 @@ import sys
 
 class Formatter(logging.Formatter):
     def format(self, record):
-        message = record.msg % record.args if record.args else record.msg
-        if record.levelno == logging.INFO:
-            return message
-        else:
-            return f"{record.levelname} {message}"
+        s = record.msg % record.args if record.args else record.msg
+
+        if record.exc_info:
+            record.exc_text = self.formatException(record.exc_info)
+            if s[-1:] != "\n":
+                s = s + "\n"
+            s = s + "\n".join([f"  {line}" for line in record.exc_text.splitlines()])
+
+        if record.levelno != logging.INFO:
+            s = "\n".join([f"{record.levelname} {line}" for line in s.splitlines()])
+
+        return s
 
 
 def init():
diff --git a/src/pricehist/sources/ecb.py b/src/pricehist/sources/ecb.py
index c5c1f96..16cb27d 100644
--- a/src/pricehist/sources/ecb.py
+++ b/src/pricehist/sources/ecb.py
@@ -1,13 +1,11 @@
 import dataclasses
-import logging
-import sys
 from datetime import datetime, timedelta
 from decimal import Decimal
 
 import requests
 from lxml import etree
 
-from pricehist import isocurrencies
+from pricehist import exceptions, isocurrencies
 from pricehist.price import Price
 
 from .basesource import BaseSource
@@ -36,19 +34,17 @@ class ECB(BaseSource):
         return ""
 
     def symbols(self):
-        root = self._data(more_than_90_days=True)
-        nodes = root.cssselect("[currency]")
-        currencies = sorted(set([n.attrib["currency"] for n in nodes]))
+        quotes = self._quotes()
         iso = isocurrencies.by_code()
-        return [(f"EUR/{c}", f"Euro against {iso[c].name}") for c in currencies]
+        return [
+            (f"EUR/{c}", f"Euro against {iso[c].name if c in iso else c}")
+            for c in quotes
+        ]
 
     def fetch(self, series):
-        if series.base != "EUR":  # EUR is the only valid base.
-            logging.critical(
-                f"Invalid pair '{'/'.join([series.base, series.quote])}'. "
-                f"Run 'pricehist source {self.id()} --symbols' to list valid pairs."
-            )
-            sys.exit(1)
+        if series.base != "EUR" or not series.quote:  # EUR is the only valid base.
+            raise exceptions.InvalidPair(series.base, series.quote, self)
+
         almost_90_days_ago = (datetime.now().date() - timedelta(days=85)).isoformat()
         root = self._data(series.start < almost_90_days_ago)
 
@@ -58,12 +54,24 @@ class ECB(BaseSource):
             for row in day.cssselect(f"[currency='{series.quote}']"):
                 rate = Decimal(row.attrib["rate"])
                 all_rows.insert(0, (date, rate))
+
+        if not all_rows and series.quote not in self._quotes():
+            raise exceptions.InvalidPair(series.base, series.quote, self)
+
         selected = [
             Price(d, r) for d, r in all_rows if d >= series.start and d <= series.end
         ]
 
         return dataclasses.replace(series, prices=selected)
 
+    def _quotes(self):
+        root = self._data(more_than_90_days=True)
+        nodes = root.cssselect("[currency]")
+        quotes = sorted(set([n.attrib["currency"] for n in nodes]))
+        if not quotes:
+            raise exceptions.ResponseParsingError("Expected data not found")
+        return quotes
+
     def _data(self, more_than_90_days=False):
         url_base = "https://www.ecb.europa.eu/stats/eurofxref"
         if more_than_90_days:
@@ -71,6 +79,19 @@ class ECB(BaseSource):
         else:
             source_url = f"{url_base}/eurofxref-hist-90d.xml"  # last 90 days
 
-        response = self.log_curl(requests.get(source_url))
-        root = etree.fromstring(response.content)
+        try:
+            response = self.log_curl(requests.get(source_url))
+        except Exception as e:
+            raise exceptions.RequestError(str(e)) from e
+
+        try:
+            response.raise_for_status()
+        except Exception as e:
+            raise exceptions.BadResponse(str(e)) from e
+
+        try:
+            root = etree.fromstring(response.content)
+        except Exception as e:
+            raise exceptions.ResponseParsingError(str(e)) from e
+
         return root
diff --git a/tests/pricehist/sources/test_ecb.py b/tests/pricehist/sources/test_ecb.py
index 4b9f0bf..912f933 100644
--- a/tests/pricehist/sources/test_ecb.py
+++ b/tests/pricehist/sources/test_ecb.py
@@ -1,14 +1,18 @@
+import logging
+import os
+from datetime import datetime, timedelta
 from decimal import Decimal
+from pathlib import Path
 
 import pytest
+import requests
+import responses
 
+from pricehist import exceptions, isocurrencies
 from pricehist.price import Price
 from pricehist.series import Series
 from pricehist.sources.ecb import ECB
 
-# import responses
-# @responses.activate
-
 
 def in_log(caplog, levelname, substr):
     return any(
@@ -26,73 +30,204 @@ def type(src):
     return src.types()[0]
 
 
+@pytest.fixture
+def xml():
+    dir = Path(os.path.splitext(__file__)[0])
+    return (dir / "eurofxref-hist-partial.xml").read_text()
+
+
+@pytest.fixture
+def empty_xml():
+    dir = Path(os.path.splitext(__file__)[0])
+    return (dir / "eurofxref-hist-empty.xml").read_text()
+
+
+@pytest.fixture
+def requests_mock():
+    with responses.RequestsMock() as mock:
+        yield mock
+
+
+@pytest.fixture
+def response_ok(requests_mock, xml):
+    requests_mock.add(
+        responses.GET,
+        "https://www.ecb.europa.eu/stats/eurofxref/eurofxref-hist.xml",
+        body=xml,
+        status=200,
+    )
+    yield requests_mock
+
+
+@pytest.fixture
+def response_ok_90d(requests_mock, xml):
+    requests_mock.add(
+        responses.GET,
+        "https://www.ecb.europa.eu/stats/eurofxref/eurofxref-hist-90d.xml",
+        body=xml,
+        status=200,
+    )
+    yield requests_mock
+
+
+@pytest.fixture
+def response_empty_xml(requests_mock, empty_xml):
+    requests_mock.add(
+        responses.GET,
+        "https://www.ecb.europa.eu/stats/eurofxref/eurofxref-hist.xml",
+        body=empty_xml,
+        status=200,
+    )
+    yield requests_mock
+
+
 def test_normalizesymbol(src):
     assert src.normalizesymbol("eur") == "EUR"
     assert src.normalizesymbol("symbol") == "SYMBOL"
 
 
-@pytest.mark.live
-def test_known_pair(src, type):
-    series = src.fetch(Series("EUR", "AUD", type, "2021-01-11", "2021-01-22"))
-    assert series.prices[0] == Price("2021-01-11", Decimal("1.5783"))
-    assert series.prices[-1] == Price("2021-01-22", Decimal("1.577"))
-    assert len(series.prices) == 10
+def test_metadata(src):
+    assert isinstance(src.id(), str)
+    assert len(src.id()) > 0
+
+    assert isinstance(src.name(), str)
+    assert len(src.name()) > 0
+
+    assert isinstance(src.description(), str)
+    assert len(src.description()) > 0
+
+    assert isinstance(src.source_url(), str)
+    assert src.source_url().startswith("http")
+
+    assert datetime.strptime(src.start(), "%Y-%m-%d")
+
+    assert isinstance(src.types(), list)
+    assert len(src.types()) > 0
+    assert isinstance(src.types()[0], str)
+    assert len(src.types()[0]) > 0
+
+    assert isinstance(src.notes(), str)
 
 
-@pytest.mark.live
-def test_long_hist_from_start(src, type):
-    series = src.fetch(Series("EUR", "AUD", type, src.start(), "2021-07-01"))
+def test_symbols(src, response_ok):
+    syms = src.symbols()
+    assert ("EUR/AUD", "Euro against Australian Dollar") in syms
+    assert len(syms) > 40
+
+
+def test_requests_logged_for_symbols(src, response_ok, caplog):
+    with caplog.at_level(logging.DEBUG):
+        src.symbols()
+    assert in_log(caplog, "DEBUG", " curl ")
+
+
+def test_symbols_not_in_iso_data(src, response_ok, monkeypatch):
+    iso = isocurrencies.by_code()
+    del iso["AUD"]
+    monkeypatch.setattr(isocurrencies, "by_code", lambda: iso)
+    syms = src.symbols()
+    assert ("EUR/AUD", "Euro against AUD") in syms
+
+
+def test_symbols_not_found(src, response_empty_xml):
+    with pytest.raises(exceptions.ResponseParsingError) as e:
+        src.symbols()
+    assert "data not found" in str(e.value)
+
+
+def test_known_pair(src, type, response_ok):
+    series = src.fetch(Series("EUR", "AUD", type, "2021-01-04", "2021-01-08"))
+    assert series.prices[0] == Price("2021-01-04", Decimal("1.5928"))
+    assert series.prices[-1] == Price("2021-01-08", Decimal("1.5758"))
+    assert len(series.prices) == 5
+
+
+def test_requests_logged_for_fetch(src, response_ok, caplog):
+    with caplog.at_level(logging.DEBUG):
+        src.fetch(Series("EUR", "AUD", type, "2021-01-04", "2021-01-08"))
+    assert in_log(caplog, "DEBUG", " curl ")
+
+
+def test_recent_interval_uses_90d_data(src, type, response_ok_90d):
+    today = datetime.now().date()
+    start = (today - timedelta(days=80)).isoformat()
+    end = today.isoformat()
+    src.fetch(Series("EUR", "AUD", type, start, end))
+    assert len(response_ok_90d.calls) > 0
+
+
+def test_long_hist_from_start(src, type, response_ok):
+    series = src.fetch(Series("EUR", "AUD", type, src.start(), "2021-01-08"))
     assert series.prices[0] == Price("1999-01-04", Decimal("1.91"))
-    assert series.prices[-1] == Price("2021-07-01", Decimal("1.5836"))
-    assert len(series.prices) == 5759
+    assert series.prices[-1] == Price("2021-01-08", Decimal("1.5758"))
+    assert len(series.prices) > 9
 
 
-@pytest.mark.live
-def test_from_before_start(src, type):
+def test_from_before_start(src, type, response_ok):
     series = src.fetch(Series("EUR", "AUD", type, "1998-12-01", "1999-01-10"))
     assert series.prices[0] == Price("1999-01-04", Decimal("1.91"))
     assert series.prices[-1] == Price("1999-01-08", Decimal("1.8406"))
     assert len(series.prices) == 5
 
 
-@pytest.mark.live
-def test_to_future(src, type):
-    series = src.fetch(Series("EUR", "AUD", type, "2021-07-01", "2100-01-01"))
+def test_to_future(src, type, response_ok):
+    series = src.fetch(Series("EUR", "AUD", type, "2021-01-04", "2100-01-01"))
     assert len(series.prices) > 0
 
 
-@pytest.mark.live
-def test_known_pair_no_data(src, type):
-    series = src.fetch(Series("EUR", "ROL", type, "2020-01-01", "2021-01-01"))
+def test_known_pair_no_data(src, type, response_ok):
+    series = src.fetch(Series("EUR", "ROL", type, "2021-01-04", "2021-02-08"))
     assert len(series.prices) == 0
 
 
-def test_non_eur_base(src, type, caplog):
-    with pytest.raises(SystemExit) as e:
-        src.fetch(Series("USD", "AUD", type, "2021-01-01", "2021-02-01"))
-    assert e.value.code == 1
-    assert in_log(caplog, "CRITICAL", "Invalid pair")
+def test_non_eur_base(src, type):
+    with pytest.raises(exceptions.InvalidPair):
+        src.fetch(Series("USD", "AUD", type, "2021-01-04", "2021-01-08"))
 
 
-@pytest.mark.xfail
-@pytest.mark.live
-def test_unknown_quote(src, type, caplog):
-    with pytest.raises(SystemExit) as e:
-        src.fetch(Series("EUR", "XZY", type, "2021-01-01", "2021-02-01"))
-    assert e.value.code == 1
-    assert in_log(caplog, "CRITICAL", "Invalid pair")
+def test_unknown_quote(src, type, response_ok):
+    with pytest.raises(exceptions.InvalidPair):
+        src.fetch(Series("EUR", "XZY", type, "2021-01-04", "2021-01-08"))
 
 
-@pytest.mark.xfail
-def test_no_quote(src, type, caplog):
-    with pytest.raises(SystemExit) as e:
-        src.fetch(Series("EUR", "", type, "2021-01-01", "2021-02-01"))
-    assert e.value.code == 1
-    assert in_log(caplog, "CRITICAL", "Invalid pair")
+def test_no_quote(src, type):
+    with pytest.raises(exceptions.InvalidPair):
+        src.fetch(Series("EUR", "", type, "2021-01-04", "2021-01-08"))
 
 
-def test_unknown_pair(src, type, caplog):
-    with pytest.raises(SystemExit) as e:
-        src.fetch(Series("ABC", "XZY", type, "2021-01-01", "2021-02-01"))
-    assert e.value.code == 1
-    assert in_log(caplog, "CRITICAL", "Invalid pair")
+def test_unknown_pair(src, type):
+    with pytest.raises(exceptions.InvalidPair):
+        src.fetch(Series("ABC", "XZY", type, "2021-01-04", "2021-01-08"))
+
+
+def test_network_issue(src, type, requests_mock):
+    requests_mock.add(
+        responses.GET,
+        "https://www.ecb.europa.eu/stats/eurofxref/eurofxref-hist.xml",
+        body=requests.exceptions.ConnectionError("Network issue"),
+    )
+    with pytest.raises(exceptions.RequestError) as e:
+        src.fetch(Series("EUR", "AUD", type, "2021-01-04", "2021-01-08"))
+    assert "Network issue" in str(e.value)
+
+
+def test_bad_status(src, type, requests_mock):
+    requests_mock.add(
+        responses.GET,
+        "https://www.ecb.europa.eu/stats/eurofxref/eurofxref-hist.xml",
+        status=500,
+    )
+    with pytest.raises(exceptions.BadResponse) as e:
+        src.fetch(Series("EUR", "AUD", type, "2021-01-04", "2021-01-08"))
+    assert "Server Error" in str(e.value)
+
+
+def test_parsing_error(src, type, requests_mock):
+    requests_mock.add(
+        responses.GET,
+        "https://www.ecb.europa.eu/stats/eurofxref/eurofxref-hist.xml",
+        body="NOT XML",
+    )
+    with pytest.raises(exceptions.ResponseParsingError) as e:
+        src.fetch(Series("EUR", "AUD", type, "2021-01-04", "2021-01-08"))
+    assert "while parsing data" in str(e.value)
diff --git a/tests/pricehist/sources/test_ecb/eurofxref-hist-empty.xml b/tests/pricehist/sources/test_ecb/eurofxref-hist-empty.xml
new file mode 100644
index 0000000..7483bd6
--- /dev/null
+++ b/tests/pricehist/sources/test_ecb/eurofxref-hist-empty.xml
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<gesmes:Envelope xmlns:gesmes="http://www.gesmes.org/xml/2002-08-01" xmlns="http://www.ecb.int/vocabulary/2002-08-01/eurofxref">
+  <gesmes:subject>Reference rates</gesmes:subject>
+  <gesmes:Sender>
+    <gesmes:name>European Central Bank</gesmes:name>
+  </gesmes:Sender>
+  <Cube>
+  </Cube>
+</gesmes:Envelope>
diff --git a/tests/pricehist/sources/test_ecb/eurofxref-hist-partial.xml b/tests/pricehist/sources/test_ecb/eurofxref-hist-partial.xml
new file mode 100644
index 0000000..3d6af0c
--- /dev/null
+++ b/tests/pricehist/sources/test_ecb/eurofxref-hist-partial.xml
@@ -0,0 +1,358 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<gesmes:Envelope xmlns:gesmes="http://www.gesmes.org/xml/2002-08-01" xmlns="http://www.ecb.int/vocabulary/2002-08-01/eurofxref">
+  <gesmes:subject>Reference rates</gesmes:subject>
+  <gesmes:Sender>
+    <gesmes:name>European Central Bank</gesmes:name>
+  </gesmes:Sender>
+  <Cube>
+    <Cube time="2021-01-08">
+      <Cube currency="USD" rate="1.225"/>
+      <Cube currency="JPY" rate="127.26"/>
+      <Cube currency="BGN" rate="1.9558"/>
+      <Cube currency="CZK" rate="26.163"/>
+      <Cube currency="DKK" rate="7.4369"/>
+      <Cube currency="GBP" rate="0.90128"/>
+      <Cube currency="HUF" rate="359.62"/>
+      <Cube currency="PLN" rate="4.5113"/>
+      <Cube currency="RON" rate="4.8708"/>
+      <Cube currency="SEK" rate="10.051"/>
+      <Cube currency="CHF" rate="1.0827"/>
+      <Cube currency="ISK" rate="155.5"/>
+      <Cube currency="NOK" rate="10.2863"/>
+      <Cube currency="HRK" rate="7.569"/>
+      <Cube currency="RUB" rate="90.8"/>
+      <Cube currency="TRY" rate="9.0146"/>
+      <Cube currency="AUD" rate="1.5758"/>
+      <Cube currency="BRL" rate="6.5748"/>
+      <Cube currency="CAD" rate="1.5543"/>
+      <Cube currency="CNY" rate="7.9184"/>
+      <Cube currency="HKD" rate="9.4982"/>
+      <Cube currency="IDR" rate="17247.33"/>
+      <Cube currency="ILS" rate="3.8981"/>
+      <Cube currency="INR" rate="89.7975"/>
+      <Cube currency="KRW" rate="1337.9"/>
+      <Cube currency="MXN" rate="24.4718"/>
+      <Cube currency="MYR" rate="4.9359"/>
+      <Cube currency="NZD" rate="1.6883"/>
+      <Cube currency="PHP" rate="58.947"/>
+      <Cube currency="SGD" rate="1.6228"/>
+      <Cube currency="THB" rate="36.848"/>
+      <Cube currency="ZAR" rate="18.7212"/>
+    </Cube>
+    <Cube time="2021-01-07">
+      <Cube currency="USD" rate="1.2276"/>
+      <Cube currency="JPY" rate="127.13"/>
+      <Cube currency="BGN" rate="1.9558"/>
+      <Cube currency="CZK" rate="26.147"/>
+      <Cube currency="DKK" rate="7.4392"/>
+      <Cube currency="GBP" rate="0.9019"/>
+      <Cube currency="HUF" rate="357.79"/>
+      <Cube currency="PLN" rate="4.4998"/>
+      <Cube currency="RON" rate="4.8712"/>
+      <Cube currency="SEK" rate="10.0575"/>
+      <Cube currency="CHF" rate="1.0833"/>
+      <Cube currency="ISK" rate="155.3"/>
+      <Cube currency="NOK" rate="10.3435"/>
+      <Cube currency="HRK" rate="7.566"/>
+      <Cube currency="RUB" rate="91.2"/>
+      <Cube currency="TRY" rate="8.9987"/>
+      <Cube currency="AUD" rate="1.5836"/>
+      <Cube currency="BRL" rate="6.5172"/>
+      <Cube currency="CAD" rate="1.5601"/>
+      <Cube currency="CNY" rate="7.9392"/>
+      <Cube currency="HKD" rate="9.5176"/>
+      <Cube currency="IDR" rate="17259.99"/>
+      <Cube currency="ILS" rate="3.9027"/>
+      <Cube currency="INR" rate="90.0455"/>
+      <Cube currency="KRW" rate="1342.29"/>
+      <Cube currency="MXN" rate="24.2552"/>
+      <Cube currency="MYR" rate="4.957"/>
+      <Cube currency="NZD" rate="1.6907"/>
+      <Cube currency="PHP" rate="59.043"/>
+      <Cube currency="SGD" rate="1.6253"/>
+      <Cube currency="THB" rate="36.859"/>
+      <Cube currency="ZAR" rate="18.7919"/>
+    </Cube>
+    <Cube time="2021-01-06">
+      <Cube currency="USD" rate="1.2338"/>
+      <Cube currency="JPY" rate="127.03"/>
+      <Cube currency="BGN" rate="1.9558"/>
+      <Cube currency="CZK" rate="26.145"/>
+      <Cube currency="DKK" rate="7.4393"/>
+      <Cube currency="GBP" rate="0.90635"/>
+      <Cube currency="HUF" rate="357.86"/>
+      <Cube currency="PLN" rate="4.516"/>
+      <Cube currency="RON" rate="4.872"/>
+      <Cube currency="SEK" rate="10.0653"/>
+      <Cube currency="CHF" rate="1.0821"/>
+      <Cube currency="ISK" rate="156.3"/>
+      <Cube currency="NOK" rate="10.381"/>
+      <Cube currency="HRK" rate="7.5595"/>
+      <Cube currency="RUB" rate="90.8175"/>
+      <Cube currency="TRY" rate="9.0554"/>
+      <Cube currency="AUD" rate="1.5824"/>
+      <Cube currency="BRL" rate="6.5119"/>
+      <Cube currency="CAD" rate="1.564"/>
+      <Cube currency="CNY" rate="7.9653"/>
+      <Cube currency="HKD" rate="9.5659"/>
+      <Cube currency="IDR" rate="17168.2"/>
+      <Cube currency="ILS" rate="3.9289"/>
+      <Cube currency="INR" rate="90.204"/>
+      <Cube currency="KRW" rate="1339.3"/>
+      <Cube currency="MXN" rate="24.3543"/>
+      <Cube currency="MYR" rate="4.9482"/>
+      <Cube currency="NZD" rate="1.6916"/>
+      <Cube currency="PHP" rate="59.296"/>
+      <Cube currency="SGD" rate="1.6246"/>
+      <Cube currency="THB" rate="36.921"/>
+      <Cube currency="ZAR" rate="18.5123"/>
+    </Cube>
+    <Cube time="2021-01-05">
+      <Cube currency="USD" rate="1.2271"/>
+      <Cube currency="JPY" rate="126.25"/>
+      <Cube currency="BGN" rate="1.9558"/>
+      <Cube currency="CZK" rate="26.227"/>
+      <Cube currency="DKK" rate="7.4387"/>
+      <Cube currency="GBP" rate="0.90333"/>
+      <Cube currency="HUF" rate="360.27"/>
+      <Cube currency="PLN" rate="4.5473"/>
+      <Cube currency="RON" rate="4.8721"/>
+      <Cube currency="SEK" rate="10.057"/>
+      <Cube currency="CHF" rate="1.0803"/>
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