Auto-generated. This article is rebuilt from app/signals/config/signal_definitions.json by scripts/build_signals_kb.py. Edit the registry entry and re-run the script — do not edit this file directly.

BBB Spread

What it is

BBB Spread — registry key bbb_spread.

BBB spread is subsumed by HY OAS in the credit implication; shown for context.

Source

Source module: credit
Data source: back_fillable

Fetched directly from app/sources/credit.py; see source code for the upstream API call and any provider-specific handling.

How it’s computed

Raw ICE BofA US Corporate BBB Index Option-Adjusted Spread from FRED series BAMLC0A4CBBB, in percentage points (e.g. 1.45 = 145 bps over the matched-duration Treasury curve). BBB is the lowest investment-grade tier; widening BBB OAS is an early signal of credit stress migrating up the rating ladder. Daily FRED publication. See app/sources/credit.py:41 (_calculate_credit). The credit category’s primary score driver is hy_oas; BBB is surfaced as a confirming companion (display_only) — a BBB widening while HY OAS is benign is the textbook early-warning divergence the dashboard renders for situational awareness.

Where it surfaces

• API field: signals.bbb_spread on GET /api/v1/signals/latest
• Surface: daily_signals row (daily-cadence persistence)
• Surface: /signals/history time series
• Surface: /signals/sparklines (UI sparklines)
• Surface: change markers in the rendered report

Bands / thresholds

Classifier direction: lower_is_better.

Health-score / alignment role

Display-only — has bands for surface labeling but does not contribute to the health score (scoring is handled by a companion metric).

Release cadence

• Publishes: intraday

See also

• /kb/api/get-signals-latest — API endpoint that serves this field.