Dr. Lena Fischer is a quantitative researcher at a small systematic fund in Boulder, Colorado. She has been an OptionsBell user for five months, primarily through the MCP server and the REST API. Recorded September 8, 2026.
The signals she builds
I aggregate unusual flow by sector and by expiry bucket. The MCP server exposes tools that return where the day's unusual premium sits along the DTE axis - short-dated reads as event bets, long-dated as positioning. That distinction alone changed how I weight my signals.
I was doing this manually before. Pulling data from a terminal, exporting to CSV, aggregating in pandas. It took two hours per session. Now I ask Claude through the MCP, and it returns the aggregated view in seconds. OptionsBell compressed my research cycle from hours to minutes.
Compared with Unusual Whales
Unusual Whales has more data types. Congressional trades. Dark pool. Greek exposure. Their API gives you 100+ endpoints. But the API is a separate $150 a month, $125 billed yearly. And I don't use congressional trades. I use unusual flow.
For my use case - unusual flow on a defined universe, aggregated by sector and expiry - the OptionsBell REST API gives me the exact fields I need at a fraction of the cost. I'm not paying for data I won't query. That's the efficiency argument.
Historical data
The MCP has a per-symbol flow history tool. I pull the series, run my aggregation, and backtest. Previous days come from the historical endpoint. For five months of research, it's been sufficient.
If I needed ten years of tick-level data, I'd look elsewhere. But for aggregate flow signals over recent weeks? OptionsBell covers it.
Limitations she has hit
US equities only. Seven thousand tickers. For my fund, that's the entire universe. If I needed international options flow, I'd have to look elsewhere. But I don't.
The other limitation is that OptionsBell is flow-focused. No Greek exposure maps. No dealer positioning. No dark pool. For a pure flow signal, that's fine. For a multi-factor model, I'd need to supplement. But for what it does, it does it well.
Would she recommend it to other quants?
For flow-focused signals at a retail-accessible price point, yes. If you need the full Unusual Whales suite, that's a different product. Unusual Whales is a data platform. OptionsBell is a flow signal service.
If you're building on unusual options activity and you want API access without the $150 a month tax, OptionsBell is the obvious choice. I ran the numbers. For five months of research, the cost savings alone paid for the entire subscription multiple times over.
Unusual Whales is a data platform. OptionsBell is a flow signal service. I'm not paying for data I won't query.
The tools Lena leans on are get_sector_flow, get_expiry_concentration and get_flow_history. All of them are listed with examples in the MCP documentation.