---
title: "Futures Open Interest Aggregate"
method: GET
path: "/v1/futures/oi"
tags: ["Futures Analytics"]
---

# Futures Open Interest Aggregate

`GET /v1/futures/oi`

## Request

- Base URL: `https://api.blocklens.co` (the document declares no server; this is the origin it was published from)
- URL: `https://api.blocklens.co/v1/futures/oi`
- Auth: none declared

Returns daily aggregate futures open interest across all exchanges for a given symbol.

- **total_oi_usd**: Total open interest in USD
- **oi_delta_usd**: Day-over-day change in OI (USD)
- **oi_delta_pct**: Day-over-day change in OI (percent)
- **exchange_count**: Number of exchanges reporting

Free tier (grade 0) for BTC with up to 60 days of history.
Pro tier (grade 1) for all symbols with unlimited history.

## Query parameters

- `symbol` string: Asset symbol (e.g. BTC, ETH)
- `network` string, nullable: Alias for symbol
- `from_date` string, date, nullable: Start date (YYYY-MM-DD)
- `to_date` string, date, nullable: End date (YYYY-MM-DD)
- `limit` integer: Number of records to return
- `fields` string, nullable: Comma-separated field names to include (date columns always kept)

## Response `200`

Successful Response

- ApiResponse: Standard API response model
  - `success` boolean, required
  - `data` unknown, required
  - `message` string, nullable
  - `count` integer, nullable
  - `timestamp` string, date-time

## Other responses

- `422`: Validation Error

---

[API](https://skmtc.dev/blocklens/apis/blocklens-on-chain-api.md) · [All operations](https://skmtc.dev/blocklens/apis/blocklens-on-chain-api/llms.txt) · [OpenAPI document](https://skmtc.dev/blocklens/apis/blocklens-on-chain-api/revisions/dacc02ae0f9a?raw)