Assymetrix Data API: tiers, coverage and data rights

What the developer product advertises

The public portal lists unified metadata, historical market data, order-book snapshots, OHLCV and streaming products across named prediction venues including Kalshi, Polymarket and Limitless. It is an API for building a data workflow rather than a place to fund and trade an event contract.

The site’s speed, uptime and historical-depth statements are vendor claims. We did not benchmark paid endpoints, verify its entire upstream rights chain or assume that similarly named cross-venue markets share the same settlement definition.

Published tiers and practical capacity

The versioned API plan table below separates monthly request allowance, per-second rate and history/endpoint scope. Those gates are independent: enough monthly capacity does not make a 200-request/second workload fit a 25-request/second limit. No paid endpoint, uptime or latency benchmark was performed.

Commercial display is not raw-feed resale

The reviewed terms allow tier-appropriate applications and display but prohibit standalone raw-data resale, API pass-through, competing data aggregation and mirroring beyond permitted caching. Public displays require attribution such as “Data provided by Assymetrix” unless waived in writing.

Reasonable operational caching is generally capped at 30 days unless the tier says otherwise. Academic/non-commercial tiers exclude commercial and trading activity. Bulk exports, where included, are for internal analysis and carry deletion requirements after termination. A subscription does not grant unrestricted redistribution.

A sensible technical evaluation

Use a small sample to verify venue/product identity, timestamp, currency/quantity units, last-trade versus bid/ask semantics and source freshness. A canonical ID does not by itself establish equivalent questions or commercial redistribution permission.

This guide evaluates the public tier and licence documents. No live feed is imported here and no paid latency or reliability benchmark is claimed. The product is relevant when you need an API pipeline, rather than a ready-made tax report or an asserted trading signal.

Budget requests before choosing a paid tier

Polling 20 markets every 60 seconds for eight hours on 22 days needs 211,200 requests if each poll is one request. It exceeds the reviewed 10,000-request Free tier but fits Developer’s 1.5 million monthly allowance; entitlement and peak rate must still fit. Polling the same markets every second uses 12,672,000, above the reviewed Pro allowance. Batch endpoints, retries and pagination can change both calculations.

Versioned API capacity and price snapshot