---
title: "A market state, its historical analogs, and what followed"
method: GET
path: "/api/v1/state-packet"
tags: ["Research"]
---

# A market state, its historical analogs, and what followed

`GET /api/v1/state-packet`

## Request

- Base URL: `https://chartlibrary.io` (the document declares no server; this is the origin it was published from)
- URL: `https://chartlibrary.io/api/v1/state-packet`
- Auth: none required

Supply a stock symbol and optionally a completed session (YYYY-MM-DD). Omit date for the latest built session, not a real-time quote. Returns the state, tape, historical analog sample, outcome ranges, and comparable historical state transitions across stocks in one call. Preserve status, sample sizes, dates, and informative receipts. Excess-return ranges are empirical observations in percentage points relative to a date-matched liquid-stock baseline; they are not automatically calibrated forecasts. Empty or weak evidence is not a directional signal. Advanced lane options remain compatibility-only.

## Query parameters

- `symbol` string, required
- `date` string, nullable

## Response `200`

Successful Response

- unknown

## Other responses

- `422`: Validation Error

---

[API](https://skmtc.dev/chartlibrary/apis/chart-library-api.md) · [All operations](https://skmtc.dev/chartlibrary/apis/chart-library-api/llms.txt) · [OpenAPI document](https://skmtc.dev/chartlibrary/apis/chart-library-api/revisions/d1b5913fb60c?raw)