---
title: "Market open interest"
method: GET
path: "/timeseries-stream/market-openinterest"
tags: ["Timeseries stream"]
---

# Market open interest

`GET /timeseries-stream/market-openinterest`

Returns a WebSocket stream of open interests for specified markets.<br/> If you are falling behind (slow client) you will get `warning` message first, then `error` message and disconnection will happen.

## Query parameters

- `markets` string[], required
- `backfill` 'latest' | 'none'
- `pretty` boolean

## Response `default`

Open Interest WebSocket message.

- StreamingMarketOpenInterest — Market open interest WebSocket message.
  - `market` string, required — Unique name of the market.
  - `time` string, required — The time in ISO 8601 date-time format. Always with nanoseconds precision.
  - `contract_count` string, required — Number of contracts.
  - `value_usd` string, required — Contract value in USD.
  - `exchange_time` string — Time corresponding to open interest data point, according to the exchange. Can be NULL, if exchange doesn't support it.
  - `cm_sequence_id` string, required — The monotonically increasing message number, resets on disconnection.

## Other responses

- `401` — Requested resource requires authorization.
- `403` — Requested resource is not available with supplied credentials.
- `414` — Provided URI is too long. It must not be greater than 10000 symbols.

---

[API](https://skmtc.net/coinmetrics/apis/coin-metrics-api-v4.md) · [All operations](https://skmtc.net/coinmetrics/apis/coin-metrics-api-v4/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/coinmetrics/coin-metrics-api-v4/revisions/774268c0a4fe/schema)