> ## Documentation Index
> Fetch the complete documentation index at: https://docs.kash.bot/llms.txt
> Use this file to discover all available pages before exploring further.

# CHAIN_NOT_SUPPORTED

> HTTP 400 — Chain not supported

**HTTP status:** 400 · **Title:** "Chain not supported"

## When it fires

A route that performs an on-chain read (`POST /v1/redemptions`, `GET /v1/markets/{id}/quote`) resolved a market on a chain the API does not support for on-chain reads.

## Why it happens

* The market is on a chain this environment does not support.

Your request is well-formed — this is a chain-support condition, not a client input error, so it is a permanent `400` (retrying will not help). (A *supported* chain missing a contract address is a server-config fault and returns `500 INTERNAL_ERROR`, not this code.)

## How to fix

* Confirm the market's chain is one of the supported chains (the `detail` lists them).
* If you believe the chain should be supported, contact support — it is a server configuration gap, not something the caller can correct.

## Related codes

* [`MARKET_NOT_FOUND`](/developer-docs/api-errors/MARKET_NOT_FOUND), [`DEPENDENCY_UNAVAILABLE`](/developer-docs/api-errors/DEPENDENCY_UNAVAILABLE)