A PRACTICAL API COMPARISON · CHECKED OCTOBER 27, 2026

sec-api.io
vs sec-api.dev

Choose by the workflow and coverage you need. sec-api.io has broader documented depth; sec-api.dev offers a smaller, source-cited interface you can evaluate with a recurring free allowance.

Test with a free API key ↗Try a request first ↗

What you can use today

Our column describes shipping capabilities and their limits. The other column summarizes official documentation, not an independent correctness or speed benchmark.

Decision	sec-api.io	sec-api.dev
Historical breadth	Documents broad historical filing access and many specialized datasets.	Insider quarterly extracts: 2025 Q4–2026 Q3. Form D: 2026 Q2–Q3. Other filing-history endpoints have separate scope.
Filing discovery	Dedicated filing query and full-text search products.	Issuer history, SEC-backed full-text discovery, and a bounded rolling local metadata index. Not a whole-corpus independent search engine.
Streaming	Documents a WebSocket filing feed.	SSE, WebSocket, and durable replay from periodic SEC feed polling; reconnect after bounded sessions. No delivery-latency SLA.
Financial extraction	Documents XBRL conversion, financial statements, and filing section extraction.	Company Facts, financial observations, filing XML and a strict inline-XBRL subset. Not equivalent to complete statements/segment normalization.
Specialized data	Lists funds, advisers, governance, ownership, and regulatory products.	Quarterly insider/Form D queries plus single-filing ownership and 13F parsers. No equivalent complete fund/adviser/governance corpus.
Developer access	Lists MCP, Python and TypeScript SDKs, and a cookbook.	REST/OpenAPI, executable tutorials, and OAuth-capable read-only MCP. ChatGPT app submitted for review; not publicly approved.

Compare pricing with the right scope

On October 27, 2026, sec-api.io’s rendered annual pricing showed Personal & Startups at $49/month ($588 billed yearly), Business Internal Use at $199/month ($2,388 billed yearly), and a first-100-calls free trial. Eligibility, usage, and redistribution terms differ. Check their checkout for the billing cadence you intend to buy.

Our recurring monthly plans are Explore: 1,000 requests free; Builder: $29 for 50,000 requests; Scale: $99 for 250,000 requests. This is different packaging and substantially narrower coverage—not a claim of an equivalent product at a lower price.

Competitor pricing and terms ↗ · Our pricing and limits ↗

Choose sec-api.io when…

Your project requires their broader specialized corpus, long historical coverage, or a particular documented feature our API does not implement.

Evaluate sec-api.dev when…

You want to build a source-cited filing workflow with documented responses, account quotas, inspectable provenance, and read-only agent tools. Validate your exact companies, periods, and extraction requirements before choosing a paid plan.

Try the same real task

Start by resolving a company, then inspect its filings. These are sec-api.dev examples, not drop-in compatibility claims.

curl 'https://sec-api.dev/api/v1/companies?query=AAPL' -H "Authorization: Bearer $SEC_API_KEY"

For quarterly ownership research, inspect as-filed transaction codes and footnotes rather than treating every acquisition as a purchase.

curl 'https://sec-api.dev/api/v1/insider-transactions?period=2026q3&transactionCode=P&limit=5&facets=true' -H "Authorization: Bearer $SEC_API_KEY"

Keep the API key on your server. Retain source URLs, periods, and snapshot identifiers with your results.

Parameters and response contracts ↗Runnable workflows ↗Coverage and limitations ↗

Sources and evaluation checklist

Checked October 27, 2026. Vendor claims are attributed to vendor documentation. Features, prices, and source availability can change.

Before migrating: test amendments, missing values, source periods, exact decimal strings, pagination, rate limits, licensing, and your largest expected response. We do not claim complete parity, guaranteed uptime, or universal accuracy.

Compare with the official SEC API ↗ · Observed service health ↗

Prove your workflow before paying.

Use the free allowance to test real data and inspect its source.

Get my free API key ↗

Independent comparison by sec-api.dev. Not affiliated with the SEC or sec-api.io. No customer testimonials or unverified performance claims.