---
title: "Kalshi orderbook fragility: thin liquidity, penny walls, single-order dominance scoring."
method: POST
path: "/v2/orderbook_risk"
tags: ["market-integrity"]
---

# Kalshi orderbook fragility: thin liquidity, penny walls, single-order dominance scoring.

`POST /v2/orderbook_risk`

Detects thin liquidity, penny walls, spread risk, and fragile orderbook structures in Kalshi markets. Returns 0-100 manipulation-vulnerability score plus signal-level evidence: wide spread (>$0.10), shallow depth (<10 contracts), few price levels, single-order dominance (>80% in top level), penny-wall pattern (large bids at ≤$0.005, common in wash trading). For agents that need to detect fragile order books before placing orders.

## Request body

- object
  - `ticker` string, required — Kalshi market ticker (e.g. KXG7LEADEROUT-45JAN01-FMER)

## Response `200`

Success (synthetic example)

## Other responses

- `400` — Bad Request — invalid or missing parameters.
- `402` — Payment Required (x402 v2): payment requirements are in the PAYMENT-REQUIRED response header (accepts[]); retry with the PAYMENT-SIGNATURE header (USDC on Base, eip155:8453). Success carries the PAYMENT-RESPONSE settlement header. The legacy X-PAYMENT header is not accepted on /v2 routes.

---

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