Do You Offer Open Interest Data? (And How to Access It via CoinAPI)

Quick Answer

Yes, CoinAPI provides Open Interest (OI) data through the Metrics endpoints of the Market Data API.

However, clarification:

• Open Interest is available as current values and historical time-series via REST.
• WebSocket does not provide Open Interest (no real-time OI streaming at this time).

Supported OI metric: DERIVATIVES_OPEN_INTEREST You can retrieve it per exchange and per instrument (e.g., BTC perpetuals on Binance Futures).

What Is Open Interest

Open Interest represents the total number of open derivative contracts (like futures or perpetual swaps) that remain unsettled.

It’s a crucial sentiment and liquidity indicator for traders and quantitative researchers.

• Rising OI with rising prices suggests capital inflows and bullish conviction.
• Rising OI with falling prices signals short-side leverage or capitulation risk.
• Falling OI indicates profit-taking, liquidation, or lack of participation.

For algo traders, tracking OI alongside price, volume, and funding rate helps confirm whether moves are driven by real conviction or fleeting leverage.

→ To learn more about how CoinAPI structures derivatives and volume metrics, see our detailed guide on Metrics API V2: Trading Volume Analysis and On-Chain Metrics.

Where to Access Open Interest in CoinAPI

Open Interest values are available under the Metrics endpoints within the Market Data API.

This includes both Metrics V1 and Metrics V2 variants.

Supported metrics include:

• DERIVATIVES_OPEN_INTEREST
• DERIVATIVES_FUNDING_RATE_CURRENT
• DERIVATIVES_INDEX_PRICE
• DERIVATIVES_MARK_PRICE
• DERIVATIVES_FUNDING_RATE_NEXT

These are exchange-specific. For example:

This means you can request exchange-level Open Interest for each derivative market (like BTCUSD_PERP) a useful input for funding rate models or open interest/volume divergence signals.

How to Retrieve Open Interest via API

1. REST Example

Endpoint:
https://rest.coinapi.io/v1/metrics/symbol/current

Sample actual response:

1[
2  {
3    "entry_time": "2025-11-25T14:57:13.8435127Z",
4    "recv_time": "2025-11-25T14:57:13.8435127Z",
5    "exchange_id": "BINANCEFTS",
6    "symbol_id": "BINANCEFTS_PERP_BTC_USDT",
7    "metric_id": "DERIVATIVES_OPEN_INTEREST",
8    "value_decimal": 91057.158
9  }
10]

Historical OI (aggregated intervals)

Use Metrics time-series endpoints (1-second, 1-minute, etc.).
Note: Metrics data is aggregated, not tick-level - no per-event OI.

Common Challenges Traders Face

Problem:

Developers often need Open Interest data across multiple exchanges to build consistent derivatives dashboards or AI models, but most exchanges expose this metric in incompatible formats (e.g., some via /funding, others through /open_interest fields).

CoinAPI’s Fix:

CoinAPI normalizes all these values into a unified schema, so each metric_id is standardized.

This eliminates the need to manually align timestamps, symbols, and quote currencies.

You can also combine Open Interest metrics with:

• Trades data for volume–OI divergence studies
• Funding rates for derivatives sentiment
• OHLCV data for backtesting volatility-linked signals

FAQ

Data Coverage and Depth

Q: Which derivatives exchanges are supported?

A: CoinAPI provides Open Interest wherever the venue publishes it, covering all major centralized derivatives exchanges.

Representative list (non-exhaustive):

• Binance Futures (USDT-M and COIN-M)

• OKX (perpetuals, futures, options)

• Bybit (perpetuals, futures, options where published)

• Deribit (options, futures)

• Kraken Futures

• HTX (Huobi) Futures

Availability depends on each exchange’s public data feeds and whether Open Interest is published for a given instrument type. If you share your target venues, CoinAPI can confirm coverage and provide a CSV matrix by exchange and contract type.

How to verify programmatically:

Query supported venues and derivative symbols via the Market Data API, then check for DERIVATIVES_OPEN_INTEREST metrics in those instruments. See the CoinAPI Market Data API docs for detailed guidance.

Q: Do you include both perpetual and dated futures?

A: Yes. CoinAPI covers both perpetual swap and fixed-maturity futures markets wherever Open Interest is published by the exchange.

For venues such as Binance, OKX, Bybit, and Deribit, both contract types are included. Each instrument is tagged with its contract family and expiry date in metadata for easy filtering.

Q: Are OI values available per instrument or aggregated market-wide?

A: CoinAPI delivers per-instrument Open Interest data to preserve analytical flexibility.

This allows traders to calculate their own aggregates, identify exchange-specific leverage pockets, or isolate individual contract dynamics rather than relying on vendor-calculated totals.

Q: How many symbols have continuous OI coverage?

A: Coverage varies across exchanges and asset classes. CoinAPI maintains continuous Open Interest series for thousands of derivative pairs, including the major BTC, ETH, and altcoin contracts on top-tier venues.

Because the Metrics API uses exchange-specific routing, continuity is maintained even during high-volatility periods.

Q: Do you include delisted or testnet contracts?

A: Delisted/expired: Yes. CoinAPI keeps full historical data, including Open Interest, for all instruments up to the time they were active. After delisting or expiry, they no longer appear in live streams, and you won’t see new OI updates beyond the instrument’s end time.

Testnet/sandbox: Not included by default. CoinAPI focuses on production markets for accuracy and stability. If you need specific testnet data for QA or simulation, this can be evaluated case by case and exposed under a separate exchange namespace, though such data isn’t covered by standard SLAs.

Historical Availability

Q: From what date does OI history begin for BTC and ETH markets?

A: There isn’t a single global “start date” for Open Interest (OI). OI history for BTC and ETH begins from the first timestamp each venue publishes OI for the specific instrument, and from when we onboarded that venue’s OI feed. Practically, this means:

BTC: earliest OI generally comes from the oldest centralized derivatives venues with additional venues (OKX, Bybit, Binance Futures, etc.) starting later as they launched OI in their public feeds.

ETH: similar pattern, typically starting later than BTC on some venues; Deribit is among the earliest for ETH options/futures, with other venues starting as their ETH derivatives went live.Because start dates vary by venue and by instrument (perps vs. dated futures vs. options), the precise earliest timestamp depends on your venue list.

Q: Is the data tick-level or aggregated per interval?

A: Metrics data is aggregated per interval - tick-level data is NOT available.

Q: Are historical OI datasets downloadable in bulk (e.g., via S3)?

A: Yes. The Flat Files API provides complete Open Interest history in compressed .csv.gz files.

Files are S3-compatible, making them directly accessible for data warehouses or analytics pipelines. Each file includes synchronized timestamps for OI, trades, and funding metrics.

Q: Do you backfill missing data automatically?

A: No backfills for metric data. CoinAPI collects OI from the moment a venue is integrated. Earlier historical OI is not reconstructed retroactively. This replaces the previous incorrect claim about T+1 backfill.

Q: How often do you revalidate historical datasets?

A: CoinAPI canonicalizes data daily (T+1) and then revalidates on an ongoing, as-needed basis whenever late data or venue corrections arrive.

Details

• Daily T+1 pass: After each UTC day closes, the historical pipeline reconciles late or out-of-order events, deduplicates records, and applies venue-side corrections. The next-day REST historical endpoints and Flat Files automatically reflect these updates. See the CoinAPI documentation and the Flat Files overview for implementation details.

• Ongoing revalidations: Beyond the daily reconciliation, CoinAPI processes upstream exchange corrections as they are detected and republishes only the affected historical partitions. There isn’t a fixed cadence beyond T+1; the process is event-driven to maintain a canonical historical record.
• Order books nuance: REST historical order books are normalized Level 2 snapshots (top 20 bids/asks, downsampled) generated by the historical pipeline. They won’t bit-match the real-time streams even after revalidation. See the REST historical order book documentation for reference.
• Indexes: Index datasets follow a severity-based recalculation policy governed by documented procedures in the Indexes API.

This layered validation workflow ensures that CoinAPI’s historical data remains consistent, deduplicated, and fully aligned with exchange-published truth over time.

Data Quality and Normalization

Q: How are units standardized across exchanges (contracts vs. USD)?

A: Exchanges differ in how they publish Open Interest - some in contract counts, others in notional USD or coin terms.

CoinAPI normalizes all Open Interest metrics into notional USD equivalents, ensuring comparability across venues.

Q: Are symbols normalized into a consistent format?

A: Yes. CoinAPI applies a uniform symbol schema across all data types.

For example:

BINANCEFTS_PERP_BTC_USDT

OKEX_FTS_BTC_USDT_260130

This consistency allows cross-exchange analysis without manual symbol mapping.

Q: How do you manage missing or delayed updates from exchanges?

A: CoinAPI tolerates upstream hiccups through redundant ingest and continuous monitoring, then makes the historical record canonical via a daily T+1 pass and event-driven revalidations. Real-time streams don’t replay missed data - use historical endpoints or Flat Files to fill gaps.

How we handle missing or delayed updates

• Ingest resilience: Data is aggregated from multiple exchanges across geo-distributed POPs. When venues provide sequence numbers or heartbeats, CoinAPI detects staleness and recovers connections automatically through resubscription or rerouting. See the ingestion overview in the CoinAPI docs.

• T+1 canonicalization: After each UTC day closes, the historical pipeline reconciles late or out-of-order events, deduplicates, and applies venue corrections. The next-day REST historical endpoints and Flat Files automatically reflect these updates.

• Ongoing revalidations: Beyond the daily cycle, CoinAPI processes upstream exchange corrections and republishes affected partitions as needed to keep historical data canonical.

• Order books nuance: REST historical order books are normalized L2 snapshots (top 20 bids/asks, downsampled). They won’t bit-match the real-time streams. For full-depth archives, use the Flat Files API.

Q: Are derived or estimated values clearly marked?

A: CoinAPI does not display a flag indicating whether a metric value is derived or raw.

Latency and Delivery

Q: What is the average round-trip latency from exchange to feed?

A: Latency varies slightly by exchange and region but remains optimized for real-time execution environments.

For a deeper explanation of latency factors, regional routing, and optimization techniques, see CoinAPI’s detailed guide: Understanding Latency in Crypto Trading

Note: These latency characteristics apply to WebSocket-supported data types (trades, quotes, order books, etc.), not to Metrics endpoints like Open Interest, which are available via REST.

Q: Is real-time OI available via WebSocket?

A: Not in the standard CoinAPI WebSocket today.

Current coverage: The WebSocket streams trades, quotes, order books (L2), OHLCV, exchange rates, and indices. Open Interest isn’t a native WebSocket channel at this time. See the Market Data API overview and protocols in the CoinAPI documentation and the Market Data API page.

Per-venue options: If you require real-time Open Interest for specific derivatives venues (such as Binance Futures, Bybit, or Deribit), share your target instruments and preferred update cadence. CoinAPI can check per-venue availability and explore options such as adding venue-specific OI feeds or delivering OI via REST endpoints where supported.

This approach ensures data integrity and synchronization with each venue’s native publication schedule while maintaining full exchange-level transparency.

Reliability and Transparency

How do you validate OI accuracy from each exchange?

CoinAPI validates accuracy through checksum comparison, timestamp integrity, and multi-source cross-verification.

Erroneous or delayed exchange messages are automatically excluded from production feeds.

How often is the dataset audited?

Automated data-integrity checks run daily, and full audits are performed monthly.

These identify gaps, restated values, or abnormal exchange patterns that may affect historical accuracy.

Are raw payloads retained for verification?

Yes. CoinAPI stores raw exchange payloads for all ingested metrics, enabling forensic verification or manual reprocessing when required.

What’s the uptime SLA for metric feeds?

CoinAPI guarantees 99.9 %+ service uptime across its global infrastructure, supported by failover routing and regional redundancy.

Summary

If your trading or analytics workflow depends on Open Interest, CoinAPI delivers:

• Standardized derivatives metrics from all major exchanges
• Historical Flat Files for backtesting and AI modeling

This unified approach lets quantitative traders, researchers, and risk managers work with consistent, exchange-synchronized Open Interest data, without writing custom scrapers or managing multiple feeds.

Try it yourself:

Get your test key and explore the Metrics API:

https://docs.coinapi.io/market-data/rest-api/metricsv2/