diff --git a/stats/parse.py b/stats/parse.py
new file mode 100755
index 0000000..0cb9276
--- /dev/null
+++ b/stats/parse.py
@@ -0,0 +1,319 @@
+#!/usr/bin/env python
+from __future__ import annotations
+
+import asyncio
+import logging
+import os
+import time
+from collections import defaultdict
+from logging import StreamHandler
+from logging.handlers import QueueHandler, QueueListener
+
+import aiohttp
+import pandas as pd
+from aiohttp_retry import ExponentialRetry, RetryClient
+
+try:
+    import Queue as queue
+except ImportError:
+    import queue
+
+
+COLUMNS = ("source", "origin", "url", "written_human_readable", "written")
+CONNECTIONS = int(os.environ.get("CONNECTIONS", 80))
+RETRIES = int(os.environ.get("RETRIES", 3))
+TIMEOUT = float(os.environ.get("TIMEOUT", 60.0))
+URL = os.environ.get(
+    "URL",
+    "https://raw.githubusercontent.com/ome/ome2024-ngff-challenge/refs/heads/main/samples/ngff_samples.csv",
+)
+WORKERS = int(os.environ.get("WORKERS", 40))
+
+LOGGER_TASK = None
+
+
+async def safely_start_logger():
+    LOGGER_TASK = asyncio.create_task(init_logger())
+    await asyncio.sleep(0)
+
+
+async def init_logger():
+    # helper coroutine to setup and manage the logger
+    # https://superfastpython.com/asyncio-log-blocking/#How_to_Log_From_Asyncio_Without_Blocking
+    log = logging.getLogger()
+    que = queue.Queue()
+    log.addHandler(QueueHandler(que))
+    log.setLevel(logging.INFO)
+    listener = QueueListener(que, StreamHandler())
+    try:
+        listener.start()
+        while True:
+            await asyncio.sleep(60)
+    finally:
+        listener.stop()
+
+
+class Event:
+    def __init__(self, queue, depth, url):
+        self.queue = queue
+        self.depth = depth
+        self.url = url
+        self.state = {}
+
+    def root(self):
+        """drops the /zarr.json suffix from urls"""
+        return self.url[:-10]
+
+    def __str__(self):
+        return f'{"\t"*self.depth}{self.url}'
+
+    def __repr__(self):
+        return f"{self.__class__.__name__}<{self.url}>"
+
+    async def load(self, rsp):
+        raise NotImplementedError()
+
+
+class CSVEvent(Event):
+    def __init__(self, *args, **kwargs):
+        Event.__init__(self, *args, **kwargs)
+
+    async def load(self, *args):
+        self.state = {"type": "csv"}
+
+        df2 = pd.read_csv(f"{self}")
+
+        if not set(df2.columns).issubset(set(COLUMNS)):
+            logging.warning(f"invalid csv: {self.url}")
+            return
+
+        size = len(df2.index)
+        logging.info(f"{self}")
+
+        df2["csv"] = [self.url] * size
+        for colname in COLUMNS:
+            if colname not in df2.columns:
+                df2[colname] = [None] * size
+
+        for _, row2 in df2.iterrows():
+            url = row2["url"]
+            if not url or not isinstance(url, str):
+                # TODO: debug?
+                continue
+            if url.endswith(".csv"):
+                # TODO: check for a sub-source
+                await self.queue.put(CSVEvent(self.queue, self.depth + 1, url))
+            else:
+                zarr = f'{row2["url"]}/zarr.json'
+                await self.queue.put(ZarrEvent(self.queue, self.depth + 1, zarr))
+
+
+class ZarrEvent(Event):
+    def __init__(self, *args, **kwargs):
+        Event.__init__(self, *args, **kwargs)
+
+    async def load(self, rsp):
+        data = await rsp.json()
+        ome = data.get("attributes", {}).get("ome", {})
+        logging.info(f"{self}")
+
+        # TODO: could check for RO-Crates in subdirectories
+        await self.queue.put(
+            ROCrateEvent(
+                self.queue, self.depth + 1, f"{self.root()}/ro-crate-metadata.json"
+            )
+        )
+
+        if "multiscales" in ome:
+            self.state["type"] = "multiscales"
+            inner = ome["multiscales"][0]["datasets"][0]["path"]
+            await self.queue.put(
+                MultiscaleEvent(
+                    self.queue, self.depth + 1, f"{self.root()}/{inner}/zarr.json"
+                )
+            )
+
+        # Array
+        if "multiscales" in ome:
+            self.state["type"] = "multiscales"
+            inner = ome["multiscales"][0]["datasets"][0]["path"]
+            await self.queue.put(
+                MultiscaleEvent(
+                    self.queue, self.depth + 1, f"{self.root()}/{inner}/zarr.json"
+                )
+            )
+
+        # Series
+        elif "plate" in ome:
+            self.state["type"] = "plate"
+            # TODO
+
+        # Series
+        elif "bioformats2raw.layout" in ome:
+            self.state["type"] = "bioformats2raw.layout"
+            await self.queue.put(
+                OMESeriesEvent(
+                    self.queue, self.depth + 1, f"{self.root()}/OME/zarr.json"
+                )
+            )
+
+        if "type" not in self.state:
+            self.state["type"] = f"unknown: {ome.keys()}"
+
+
+class ROCrateEvent(Event):
+    def __init__(self, *args, **kwargs):
+        Event.__init__(self, *args, **kwargs)
+
+    async def load(self, rsp):
+        if rsp.status >= 400:
+            raise MissingException(f"status:{rsp.status}")
+        else:
+            data = await rsp.json()
+            logging.info(f"{self}")
+
+
+class OMESeriesEvent(Event):
+    def __init__(self, *args, **kwargs):
+        Event.__init__(self, *args, **kwargs)
+
+    async def load(self, rsp):
+        if rsp.status >= 400:
+            await self.queue.put(
+                OMEMetadataEvent(
+                    self.queue, self.depth, f"{self.root()}/METADATA.ome.xml"
+                )
+            )
+        else:
+            data = await rsp.json()
+            logging.info(f"{self}")
+            self.state["type"] = "ome"
+            series = data["attributes"]["ome"]["series"]
+            for s in series:
+                await self.queue.put(
+                    MultiscaleEvent(
+                        self.queue, self.depth + 1, f"{self.root()[:-4]}/{s}/zarr.json"
+                    )
+                )
+
+
+class OMEMetadataEvent(Event):
+    def __init__(self, *args, **kwargs):
+        Event.__init__(self, *args, **kwargs)
+
+    async def load(self, rsp):
+        if rsp.status >= 400:
+            raise MissingException(f"status:{rsp.status}")
+            # TODO: just check for the individual series
+
+        data = await rsp.json()
+        logging.info(f"{self}")
+        self.state["type"] = "ome"
+        series = data["attributes"]["ome"]["series"]
+        for s in series:
+            await self.queue.put(
+                MultiscaleEvent(
+                    self.queue, self.depth + 1, f"{self.root()[:-4]}/{s}/zarr.json"
+                )
+            )
+
+
+class MultiscaleEvent(Event):
+    def __init__(self, *args, **kwargs):
+        Event.__init__(self, *args, **kwargs)
+
+    async def load(self, rsp):
+        data = await rsp.json()
+        logging.info(f"{self}")
+        self.state["type"] = "array"
+        self.state["array"] = data
+
+
+class ErrorEvent(Event):
+    def __init__(self, *args, **kwargs):
+        Event.__init__(self, *args, **kwargs)
+
+    async def load(self, *ignore):
+        self.state["type"] = "error"
+
+
+class MissingException(Exception):
+    def __init__(self, code):
+        Exception.__init__(self)
+        self.code = code
+
+
+async def process(event: Event, client: RetryClient):
+    timeout = aiohttp.ClientTimeout(total=None, sock_connect=TIMEOUT, sock_read=TIMEOUT)
+    async with client.get(event.url, timeout=timeout) as response:
+        await event.load(response)
+
+
+async def worker(queue, client, state):
+    while not queue.empty():
+        event = await queue.get()
+        try:
+            await process(event, client)
+            await state.put(event.state)
+        except MissingException as me:
+            await state.put({"event": event, "code": me.code})
+        except Exception as e:
+            await state.put({"event": event, "error": e, "type": "error"})
+        finally:
+            queue.task_done()
+
+
+async def main():
+    start = time.time()
+
+    # HTTP Setup
+    connector = aiohttp.TCPConnector(limit=CONNECTIONS)
+    session = aiohttp.ClientSession(connector=connector)
+    options = ExponentialRetry(attempts=RETRIES)
+    client = RetryClient(
+        client_session=session,
+        raise_for_status=False,
+        retry_options=options,
+    )
+
+    await safely_start_logger()
+
+    queue = asyncio.Queue()
+    state = asyncio.Queue()
+    csv = CSVEvent(queue, 0, URL)
+    await queue.put(csv)
+    await process(csv, client)
+
+    # Loading
+    consumers = [
+        asyncio.create_task(worker(queue, client, state)) for _ in range(WORKERS)
+    ]
+    await queue.join()
+    for c in consumers:
+        c.cancel()
+
+    # Parsing
+    try:
+        tallies = defaultdict(int)
+        errors = []
+        while not state.empty():
+            v = await state.get()
+            _type = v.get("type")
+            tallies[_type] += 1
+            if _type == "error":
+                errors.append(v)
+        for k, v in tallies.items():
+            logging.info(f"{k}={v}")
+        for err in errors:
+            logging.error(f"{err}")
+
+    # Cleaning
+    finally:
+        await client.close()
+
+    stop = time.time()
+    logging.info(f"in {stop-start:0.2f} seconds")
+
+
+if __name__ == "__main__":
+    asyncio.run(main())