Hyperliquid L4 Fixes, Better Exchange Data, and Flat Files Updates

October brought another round of market data improvements across CoinAPI, FinFeedAPI, and the APIBricks platform.

CoinAPI strengthened Hyperliquid L4 order book reconstruction, improved live trade and quote processing across several exchanges, and updated Flat Files pricing and data consistency. We also resolved Flat Files download issues and improved invoice handling across the shared platform.

Here’s what changed.

More Reliable Hyperliquid L4 Reconstruction

October introduced additional fixes for HYPERLIQUIDL4 in the CoinAPI Market Data WebSocket DS API.

Immediate-or-cancel (IOC) and market orders are now excluded from the resting order book, preventing them from creating crossed snapshots.

We also resolved two issues that could interrupt L4 data processing:

• Rejected trigger orders no longer cause a symbol's stream to stall.
• Streams that cannot apply an order book update now resynchronize from a fresh snapshot instead of freezing.

These changes improve the consistency of reconstructed order books and help consumers recover from unexpected order lifecycle events.

Better Real-Time Trade and Quote Data

Several CoinAPI exchange integrations received improvements to how live market data is collected and published.

• BITRUE now publishes trades as they arrive through the live stream, using the exchange's original timestamps instead of polling each symbol once per second. Order book subscriptions were also fixed to keep updates flowing.
• OKEX quotes now follow the underlying order book, including the correct bid and ask sizes.
• LUNO now applies order book changes level by level, improving how incremental updates are processed.

Together, these changes make live trades, quotes, and order books more consistent with the data published by their source exchanges.

Exchange-Specific Data Fixes

Additional fixes addressed data accuracy and instrument metadata across several exchanges.

• DERIBIT now preserves trades that follow a liquidation within the same batch. Options order books use the exchange's 100ms feed, and index symbols are no longer incorrectly subscribed as tradable markets.
• BITKUB symbol discovery is working again. Duplicate trades are published only once, and broker markets retain their order books.

We also improved derivatives instrument metadata:

• KRAKENFTS: Symbols now include instrument type, inverse or linear classification, contract unit, tick size, size precision, and the exchange's expiry time.
• BINANCEFTSC: Contract sizes now follow the exchange specification.
• BINANCEFTS: Linear contracts are no longer incorrectly classified as inverse.

These corrections are particularly useful for applications that depend on accurate contract specifications, symbol discovery, and historical trade records.

Flat Files Depth Bands and Pricing Updates

CoinAPI updated the pricing and data format for LIMITBOOK_DEPTH_BANDS Flat Files.

The dataset uses the following daily volume tiers, calculated per SKU:

Committed plan discounts continue to apply.

Organizations already using Flat Files retained their previous rates of $24.00, $12.00, and $6.00 per GiB until October 16, 2026, at 00:00 UTC. The migration was listed in Console under Billing > Pricing migrations.

We also clarified the dataset's expected frequency.

LIMITBOOK_DEPTH_BANDS contains one row per minute. Files generated at one-second intervals between March 24 and April 18, 2026, are being rewritten to match this format.

Per-exchange Parquet files are retained for the most recent 90 days.

More Reliable Flat Files Downloads

A shared Flat Files API fix addresses downloads that previously failed when usage metering could not match a request to a priced product.

This affected both CoinAPI and FinFeedAPI.

Downloads no longer fail because of this pricing lookup issue, improving reliability for historical data retrieval and bulk data workflows.

Improved Invoice Handling Across APIBricks

The APIBricks Console also received updates to past-due invoice handling.

Automatic payment collection is now retried daily for overdue invoices.

Service can be suspended after an invoice remains unpaid for 14 days.

These changes apply across CoinAPI and FinFeedAPI and make the overdue payment process more consistent.

More Consistent Market Data and Platform Operations

CoinAPI strengthened Hyperliquid L4 reconstruction, corrected several exchange-specific data issues, and improved how real-time trades and order books are processed.

Flat Files received updated depth-band pricing, more consistent data intervals, and a fix for failed downloads. Meanwhile, shared billing improvements help standardize invoice handling across the platform.

Explore CoinAPI, FinFeedAPI, or visit the APIBricks documentation for the latest APIs, datasets, and platform updates.