---
title: "Latest mark (last trade price) for up to 200 contract/token pairs"
method: GET
path: "/v1/marks"
tags: ["Marks"]
---

# Latest mark (last trade price) for up to 200 contract/token pairs

`GET /v1/marks`

## Request

- Base URL: `https://md.kairos.trade`
- URL: `https://md.kairos.trade/v1/marks`
- Auth: one of:
  - none
  - API key in header `X-Client-Id` and API key in header `X-Api-Key` and API key in header `X-Api-Secret`

A mark is defined as the LAST TRADE PRICE, on the 0–100 scale used by candles/trades (not the 0–1 probability scale used by PnL consumers). Rate-limit bucket: HEAVY and explicitly uncacheable at the HTTP layer (`Cache-Control: no-store`, no ETag); real-time consumers should prefer the WebSocket feed instead.

Pairs that have never traded are omitted from the response entirely (no zero/null placeholder).

Cost: larger requests consume more of your quota based on the number of pairs requested. Since the hard cap is 200 pairs, the maximum possible cost for one request is 2 heavy units.

## Query parameters

- `provider` 'kalshi' | 'polymarket' | 'opinion' | 'predictfun' | 'hyperliquid' | 'kalshi_offchain' | 'dome', required
- `pairs` string, required

## Response `200`

Marks for the requested pairs, in request order; never-traded pairs are omitted.

- MarksResponse
  - `marks` Mark[], required: One entry per pair that has ever traded, in request order. Never-traded pairs are omitted.
    - `contract_id` string, required
    - `token_id` string, required
    - `price` number, required: Last trade price on the 0–100 scale (matches candles/trades; divide by 100 for a 0–1 probability).

## Other responses

- `400`: Unknown provider, missing `pairs`, `pairs` exceeds 200, or a pair is not in `contract_id:token_id` form.
- `401`: No valid credential presented. Every path returns `code: unauthorized`; the triggers differ: - An `Authorization` header on a deployment where bearer auth is not enabled (`bearer authentication is not enabled`). - A bearer token that fails verification (`invalid or expired session`), or whose token/session has been revoked (`session has been revoked`). - An incomplete or wrong API-key header set. Sending *any* of `X-Client-Id`, `X-Api-Key`, `X-Api-Secret` commits the request to the API-key path, so a partial set is rejected rather than silently degrading to anonymous limits (`valid X-Client-Id, X-Api-Key, and X-Api-Secret headers are required`). - No credential material at all while the anonymous free tier is unavailable — switched off for the deployment, forced off through the runtime kill switch, or not yet resolvable on a replica that has never read the flag (it fails closed).
- `403`: API key presented from a source IP not in that credential's whitelist.
- `429`: Two different gates return this status, both with `code: rate_limited`: - **Per-credential (or per-IP, when anonymous) weighted budget exhausted.** The message is `rate limit exceeded`, or, for anonymous callers, `anonymous rate limit exceeded — request an API key for higher limits (…)`. `Retry-After` is the whole number of seconds until the current one-minute window rolls over, floored at 1. All four `X-RateLimit-*` headers are present. - **Per-IP admission gate.** An in-process, pre-authentication guard that keeps a flood off the shared credential cache and database. The message is `too many requests from this address` and `Retry-After` is a flat `60`. Because this fires *before* authentication, the response carries **no** `X-RateLimit-*` headers at all.
- `500`: The marks lookup failed.
- `503`: The rate limiter is unreachable. Fails CLOSED — the request is rejected rather than let through unmetered.

---

[API](https://skmtc.dev/kairos/apis/kairos-market-data-api.md) - [All operations](https://skmtc.dev/kairos/apis/kairos-market-data-api/llms.txt) - [OpenAPI document](https://skmtc.dev/kairos/apis/kairos-market-data-api/revisions/01e987f59a04?raw)