> Source: https://ashareapi.com/en/wiki/adjustment/  ·  Markdown version for LLMs / AI agents

Reference

# Adjustment convention
 K-line prices are always forward-adjusted. There is no adjust parameter, and prices do not gap on ex-dividend dates — so moving averages and pattern work are not fooled by the ex-dividend hole. But do not splice in unadjusted data from elsewhere: that double-adjusts the series.

## The short version

 `/v1/kline` prices are **always forward-adjusted** — there is no `adjust` parameter and none is needed, and prices **do not gap** on ex-dividend dates.


## What forward adjustment means

 Historical prices are back-adjusted by each ex-dividend / ex-rights ratio, using the **latest price** as the reference point.

 The benefit is a **continuous** price series: on the day a stock pays a dividend or splits, the chart does not drop by a sudden hole, so moving averages, patterns and percentage changes are not distorted by it.

 The trade-off is that **historical prices change over time** — every ex-dividend event recomputes all earlier prices. The same stock’s historical K-line can therefore return different values today than it did last month. For backtesting, **re-fetch the data each time** rather than caching old price series for long.


## Three things to know


### 1. There is no `adjust` parameter

 `/v1/kline` accepts only `code`, `period` and `count`. Passing `adjust` will not be recognised — the convention is fixed, there is nothing to choose.


### 2. No gap on ex-dividend dates

 Moving averages, pattern detection and technical indicators are not fooled by the ex-dividend hole. That is the direct benefit of a fixed forward adjustment.


### 3. Do not double-adjust

 If you splice **unadjusted data from another source** (or data adjusted a different way) together with the prices we return, or apply another adjustment pass on top, the series is wrong — that is **double adjustment**.


## How to check it yourself

 Take a stock’s close series (`last` in each `data` row) for **three days either side of an ex-dividend date** and look at whether it is continuous:

 

- **Continuous** (no sudden step or hole) ⇒ the convention is working.


- A visible gap ⇒ first confirm the stock really did go ex-dividend that day (check the announcement), then investigate.




## Common misuses

 

- **Passing adjust** — the parameter does not exist; the convention is fixed.


- **Splicing in unadjusted data** — double adjustment; the series is wrong.


- **Caching historical K-lines for a long time** — forward adjustment recomputes on each new ex-dividend event, so stale caches go out of date.




 Last updated: 2026-10-05
 Convention taken verbatim from the /v1/kline endpoint description, checked against live responses on 2026-10-05.

 Read next

-
[K-line field reference](/en/wiki/kline-fields)

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[Full endpoint list](/en/endpoints)

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