---
title: "Calibration of the market sensor we cite (Brier, log loss, reliability bins)"
method: GET
path: "/api/calibration-data"
---

# Calibration of the market sensor we cite (Brier, log loss, reliability bins)

`GET /api/calibration-data`

## Request

- Base URL: `https://api.signalbureau.ai`
- URL: `https://api.signalbureau.ai/api/calibration-data`
- Auth: none declared

The grading dataset for the market sensor we cite, and the published home of these numbers — forward (contamination-proof) and out-of-sample retrospective scores with confidence intervals. Freshness is PER-COMPONENT: the forward slice regenerates daily as markets mature; the retrospective slice is a fixed benchmark that re-runs on engine changes. Each slice carries its own generatedAt — read those, not the top-level asOf. Edge-cached 1 h. Rows: `crowd` (the prediction-market price) and `base_rate` (the naive null it is scored against), in both slices. No forecaster of ours is published — we sell a maintained, source-traced record and cite market prices as one graded sensor; we serve current state, not forecasts (since 2026-08-19, restated 2026-10-07). The payload states this in `whatThisCovers`.

## Response `200`

Calibration dataset for the cited market sensor.

- object

---

[API](https://skmtc.dev/sigb/apis/signal-bureau-api.md) · [All operations](https://skmtc.dev/sigb/apis/signal-bureau-api/llms.txt) · [OpenAPI document](https://skmtc.dev/sigb/apis/signal-bureau-api/revisions/290c9c6ca0d0?raw)