Case Study · Built by Modeo
Daily Macro Briefing
The U.S. economy in one quotable read, twice a day
The Daily Macro Briefing turns 26 economic indicators into one short, quotable paragraph on inflation, jobs, growth, and rates, refreshed twice a day at macro.modeo.io.
Modeo built and operates this: a pipeline that pulls 26 indicators from public sources twice a day, then has one constrained language model write the briefing, with every number machine-checked against the source.
What did Modeo build?
Twice a day, a Python pipeline pulls 26 configured indicators from public sources: a FRED backbone grafted with same-day feeds where FRED lags, including Treasury.gov for the 2-year and 10-year yields, the BLS for CPI and jobs, the New York Fed, CBOE, FiscalData, and a gold spot feed. Spread rows are derived without extra API calls.
The economic call itself is deterministic. A hand-written rules engine assigns one of five macro regimes from thresholds on core CPI, real GDP, unemployment level and trend, and the yield curve, with hysteresis so the label does not flap. No model touches that decision.
Where does the AI fit, and how is it kept honest?
One constrained language model call writes the paragraph: schema-pinned, low temperature, narrating the regime the rules engine already chose. A Groq failover stands behind the primary model and has taken over in production, including the day a vendor retired the configured model.
Then a deterministic validator re-checks the writing: every number is verified against the source data within a fixed tolerance, every date token against the input's own periods, indicator ids against a whitelist, plus an advice-phrasing scan and length caps. An invalid output gets one retry, then a deterministic template card. The reader never sees an error.
What does production discipline look like here?
The publish is idempotent, so duplicate, delayed, and DST-shifted cron firings resolve to one briefing per session. An implausible source value skips the model entirely rather than narrating a bad number. A monitoring dashboard is regenerated after every run, and a red status aborts the publish so the site keeps serving the last good briefing.
- More than 400 test functions run the entire pipeline offline with injected fake clients
- Six committed JSON Schema contracts between pipeline stages
- Two runtime Python dependencies, total
- Hand-built installable PWA frontend: no framework, no bundler, no accounts, offline-capable
Why it matters for enterprise buyers
This is the pattern most enterprises actually need from generative AI: deterministic logic where correctness matters, one tightly constrained model where language matters, and machine verification between the two. It runs unattended twice a day, and you can check its work live.
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