API discoveries

Drillr vs Aletheia vs CongressInvests vs Dino.markets: Financial Data API Comparison

A practical comparison of four financial data APIs covering equity fundamentals, insider trades, congressional disclosures, and prediction-market spreads. Based on directory records observed 2026-09-28.

AltAPIs Editorial · AI-assisted · automatically published after software checks; not human-reviewed

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Reported Purposes and Core Offerings

Drillr provides fundamentals, filings, earnings, ownership, and events for US, China, and Japan equities. Aletheia focuses on insider trading data, earnings call analysis, and financial statements. CongressInvests delivers real-time U.S. congressional stock trade disclosures sourced from Senate EFD and House Clerk filings. Dino.markets offers matched Kalshi and Polymarket prediction-market data with cross-venue spreads. All four require API key authentication and were observed in the directory on 2026-09-28.

Data Coverage Differences

Drillr covers three major equity markets (US, China, Japan) with a broad fundamental dataset including ownership and corporate events. Aletheia emphasizes insider transactions and earnings call analytics, which may complement fundamental data but does not specify geographic scope in its description. CongressInvests is narrowly focused on a single regulatory dataset — congressional trading disclosures — making it a specialized transparency tool rather than a general market data feed. Dino.markets operates in a different domain entirely: prediction-market pricing from two specific venues (Kalshi and Polymarket), providing spread data rather than traditional securities information.

Geographic and Market Scope

Drillr explicitly lists US, China, and Japan equities, giving it the broadest international equity coverage among the four. Aletheia's description does not specify countries, so its geographic reach is unclear from the directory record alone. CongressInvests is explicitly U.S.-only, drawing from federal congressional disclosure systems. Dino.markets covers prediction markets that are U.S.-accessible (Kalshi is CFTC-regulated; Polymarket operates globally with restrictions), but its data reflects market-implied probabilities, not underlying securities across jurisdictions.

Data Freshness and Source Types

CongressInvests advertises 'real-time' congressional disclosures, suggesting low-latency ingestion from Senate EFD and House Clerk systems. Drillr and Aletheia describe content types (filings, earnings calls, insider trades) but do not state update frequencies or latency in their directory entries. Dino.markets provides 'matched' prediction-market data and 'cross-venue spreads,' implying continuous or frequent polling of Kalshi and Polymarket order books. None of the four records include SLA, historical depth, or backfill details.

Evaluation Questions and Next Steps

Before integrating any of these APIs, verify: (1) geographic coverage matches your universe — Drillr for multi-market equities, CongressInvests for U.S. political trades, Dino.markets for prediction-market signals, Aletheia for insider/earnings-call analytics; (2) update frequency and historical depth meet your modeling needs; (3) API key provisioning, rate limits, and pricing (not disclosed in directory records); (4) data licensing and redistribution rights; (5) whether Aletheia's unspecified geographic scope includes your target markets. Request trial access and schema documentation from each provider to assess field-level compatibility.