The best company data API in 2026 is CUFinder for sales-ready firmographics with field-level endpoints, People Data Labs for raw company datasets at developer scale, and OpenCorporates for free official registry data. Judge every option on two numbers: match rate on YOUR domains, and cost per matched, correct record.
I learned that the embarrassing way.
Back in Hamburg in 2020, my first TAM model double-counted 1,400 companies because two data sources spelled the same brands three different ways. Nobody caught it until the board deck. I wanted to disappear into the carpet.
The fix wasn’t clever. It was one company data API as the source of truth, plus a normalizer for the names. Boring wins again.
So which API should be YOUR source of truth? I ran the same 1,500 domains through nine providers this summer and measured what actually came back. One note before the list: this is an honest comparison, not an ad. CUFinder is our product, and it gets real cons below like everyone else. Let’s get into it.
🔍 Did You Know? B2B data decays at roughly 2-3% a month, about 30% a year, as companies move, merge, rename, and close. (Source: ZoomInfo)
TL;DR: The Best Company Data APIs in 2026
We scored nine company data APIs on accuracy, coverage, freshness, depth, pricing transparency, developer experience, and support. Winners by job:
- Best overall: CUFinder. 93% match rate on our 1,500 domains, 260M+ companies, and ten company endpoints from full enrichment down to single-question lookups. From $49/mo.
- Best raw dataset for developers: People Data Labs. Company enrichment and search as pure API, from $98/mo.
- Best multi-source records plus hiring signals: Coresignal. From $49/mo, datasets from $1,000.
- Best budget self-serve: The Companies API. $95/mo for 50,000 credits.
- Best knowledge graph: Diffbot. AI-read web data with a real free plan (10,000 credits/mo).
- Best free and registry data: OpenCorporates, plus Companies House and SEC EDGAR for official records.
What Is a Company Data API?
A company data API takes a domain or company name and returns structured firmographics as JSON. Industry, headcount, revenue, location, tech, hierarchy: the fields your CRM is missing.
That’s the short version, and it’s enough for this page. But if you’re still mapping the category, our B2B data API explainer walks through what these APIs return across both people and companies, and how to choose a type. Here, we rank the company-scope vendors themselves.
Company Data APIs vs Stock Market Data APIs
Firmographic APIs describe companies; financial market APIs price them. Search “best company data api” and half the results push stock tickers at you. Different tool, different job.
A company financial data api like FactSet or Alpha Vantage serves fundamentals, filings, and market prices for investors. The firmographic APIs in this article serve go-to-market teams instead. They tell you what a company does, how big it is, and whether it fits your ICP (ideal customer profile). If you came here for tickers, close this tab with my blessing. If you came to fill your CRM’s empty columns, keep reading.
The 3 Sources of Company Data
Every provider below builds on one of three sources. Know the source and you can predict the failure mode.
1. Official registries
Government registers like Companies House in the UK and SEC EDGAR in the US publish legal filings for free. OpenCorporates gathers 200M+ legal entities from registries worldwide. This is legal truth: incorporation, officers, status. It’s also thin. A registry rarely knows what a company sells or uses.
2. Commercial compilers
CUFinder, People Data Labs, Coresignal, and The Companies API blend licensed sources, public web data, and their own verification into sales-ready records. You pay per record, and you get the fields revenue teams actually filter on.
3. Web-read knowledge graphs
Diffbot’s crawlers read the public web with AI and build entities from what they find. Widest net, noisiest catch. Great for coverage and research, but verify critical fields before you route territory on them.
Most mature stacks blend two: registry truth for verification, a commercial compiler for freshness and depth.
📌 Reality Check: a registry knows a company EXISTS. It rarely knows what the company does, uses, or earns. Legal truth and sales truth are different databases.
What I Check Before Trusting a Company Data API
Seven things, in order:
- Match rate on MY domains. Not the vendor’s demo set. Mine.
- Field fill per attribute. A match with empty revenue and headcount columns is a rain check, not data.
- Freshness cadence. Real-time delivery is not real-time collection. Ask when the record was last verified.
- Hierarchy handling. Parent vs subsidiary confusion silently breaks account scoring and dedupe.
- No-match billing. “Never charged” and “every lookup costs a credit” are very different bills at 100k rows.
- Pricing transparency. A published ladder beats a demo call, every time.
- Docs quality. If the quickstart takes an afternoon, the integration takes a quarter.
How I Tested and Scored 9 Company Data APIs
No vendor paid for placement. No affiliate links. And full disclosure: CUFinder is our product. Same 1,500 domains, same rules for everyone.
The sample: a third SMB, a third mid-market, a third enterprise, with 200 non-US domains mixed in on purpose. I measured match rate, field fill (industry, headcount, revenue, location), cross-vendor agreement on headcount, response time, and how each API bills a no-match.
What broke, so you know this was real: one API matched a bakery’s domain to a bank with a similar name. And two vendors disagreed on one company’s headcount by 4x. That’s why agreement checks matter.
Each API then got scored across seven weighted pillars: data accuracy (22%), coverage (20%), freshness (13%), enrichment depth (13%), pricing transparency (12%), docs and developer experience (12%), rate limits and support (8%). Quote-only pricing lands in a fixed middle band, the same for every sales-led vendor.
Overall = Σ (PillarScore × Weight)→FinalScore/100 = round(Overall × 10, 1)
Check my math. CUFinder: (9.6×.22)+(9.4×.20)+(9.8×.13)+(9.6×.13)+(9.5×.12)+(9.0×.12)+(9.0×.08) = 9.45 → 94.5/100.
Two honest limits. Three weeks can’t judge long-term support. And every vendor’s revenue figures are modeled estimates, so I scored plausibility and ranges, not gospel truth. Treat revenue fields that way in your CRM too.
Quick Comparison: 9 Company Data APIs
| API | Type | Best for | Match rate* | Entry price | Score /100 |
|---|---|---|---|---|---|
| CUFinder | Commercial compiler | Sales-ready firmographics | 93% | $49/mo | 94.5 |
| People Data Labs | Compiler | Raw datasets for devs | 89% | $98/mo | 84.3 |
| Coresignal | Compiler | Records + hiring signals | 88% | $49/mo | 84.0 |
| Diffbot | Knowledge graph | Web-wide coverage | 91% | Free plan | 80.8 |
| The Companies API | Compiler | Budget self-serve | 81% | $95/mo | 80.4 |
| Crustdata | Real-time compiler | Live company records | 84% | Not published | 77.7 |
| HubSpot Breeze (Clearbit) | In-CRM enrichment | HubSpot users | 86% | HubSpot credits | 76.2 |
| Grata | Private-market platform | M&A research | 74% | Not published | 75.2 |
| OpenCorporates | Registry aggregator | Legal-entity truth | By company number | On request | 75.1 |
*Match rate on our 1,500-domain sample. Your list will differ. That’s the point of re-testing.
The 9 Best Company Data APIs Reviewed
1. CUFinder: Best Overall for Sales-Ready Firmographics
CUFinder 9.5/10: one key, ten company endpoints. Full disclosure again: CUFinder is our product.
Pricing: free trial (15 credits, no card), Lite $49/mo (1,000 credits), Standard $129/mo (3,000), Pro $299/mo (10,000), Premium $449/mo (20,000). Unlimited teammates, and “Not Found” rows are never charged.
Who it’s for: sales, marketing, and RevOps teams that want firmographics they can act on without building a data pipeline first.
The good and the not-so-good:
- + 93% match on our 1,500 domains with the best field fill of the test, from a 260M+ company database.
- + Field-level endpoints: pay one credit for the one answer you need, not a full profile every time.
- + Published price ladder, unlimited seats, free no-match lookups, GDPR/CCPA aligned, SOC 2 Type II.
- – Revenue figures are modeled estimates, like every vendor here: treat them as ranges.
- – CRM pushes cover HubSpot, Salesforce, and Zoho, but warehouse-native reverse-ETL is thinner.
- – Less name recognition in North America than ZoomInfo or Apollo.
The core is the company enrichment endpoint: domain or name in, full firmographic profile out, including industry, size, revenue, socials, and location. For net-new lists, the company search endpoint filters the index by industry, headcount, location, and revenue instead of enriching one record at a time.
But here’s what actually separates it. Most vendors sell one enrichment blob. CUFinder also exposes single-question endpoints, so a credit answers exactly the question you have:
- Company revenue finder and employee count for sizing and lead scoring.
- Company locations for territory planning, and subsidiaries finder for mapping account hierarchies before they break your scoring.
- SaaS checker and B2B-or-B2C checker for fast ICP filtering.
- Company snapshot for a strategic overview, and B2B customers finder to see which businesses buy from a company, which is targeting gold competitors rarely offer.
- And the long tail nobody else bothers with: company lookalikes for cloning your best accounts, mission statement for personalization lines, and demo and free-trial checkers for reading a vendor’s sales motion before you pitch.
In my 1,500-domain run, people-data freshness is daily and company records get monthly verification. The bakery-to-bank mismatch I mentioned earlier? Not this one. Names resolved cleanly even on the messy German GmbHs that wrecked my 2020 TAM model.
2. People Data Labs: Best Raw Company Dataset for Developers
People Data Labs 8.4/10: build-your-own, at scale.
Pricing: free testing tier, self-serve API access from $98/mo, per-match credits.
PDL pairs a company enrichment endpoint with company search across a huge index. The docs are among the best I tested, and it matched 89% of my sample with strong non-US coverage. The trade-offs are structural. No dashboard, no CRM push, and the person-first heritage shows in company-field depth. If you have engineers, it’s excellent raw material. If you don’t, it’s homework.
3. Coresignal: Best Multi-Source Records Plus Hiring Signals
Coresignal 8.4/10: firmographics with a jobs feed attached.
Pricing: 7-day free trial, plans from Mini $49/mo (2,500 credits) to Elite $5,000/mo, datasets from $1,000.
Coresignal’s edge is history and signals. Employee-count trends and job-posting data ride along with the company records, which makes it a favorite for growth models and sourcing tools. It matched 88% here. Two cautions: it’s a data-team product, not an SDR tool, and credits scale with result counts. Test a query’s cost before you scale it.
4. Diffbot: Best AI Knowledge Graph
Diffbot 8.1/10: the web, read by machines.
Pricing: free plan ($0, 10,000 credits/mo, no card, 5 requests/min), Startup $299/mo (250,000 credits, overage $0.001), Plus $899/mo (1M credits).
Diffbot’s crawlers read the public web and assemble a Knowledge Graph you query with DQL, its own query language. Coverage is remarkable: 91% match, including long-tail companies nobody else had. And the free plan is genuinely useful. The honest cons: web-read data inherits web noise, DQL is a learning curve, and wide queries burn credits fast. Verify before you route revenue on it.
5. The Companies API: Best Budget Self-Serve for Builders
The Companies API 8.0/10: honest pricing, modern docs.
Pricing: Startup $95/mo (50,000 credits), Scaleup $295/mo (250,000), Enterprise $595/mo (500,000); every plan covers the full 50M+ company index; two months free on annual.
For indie builders and small product teams, this is the value pick. Clean endpoints, a transparent ladder, and 50,000 credits at $95 undercuts most of this list. The cons are proportionate. The index is smaller than the giants’ (81% match on my sample, weakest on enterprise subsidiaries). Credits-per-call varies by endpoint, so model your real cost. And it’s a small company, so ask the bus-factor question before an enterprise bet.
6. Crustdata: Best Real-Time Company Data
Crustdata 7.8/10: freshness as the product.
Pricing: not published; demo-led sales.
Crustdata serves live-refreshed company records: headcount, web traffic, social activity, delivered by API. On fast-moving accounts it caught changes my monthly-cadence vendors hadn’t. The cost of that freshness: sales-led buying with no public pricing, which capped its transparency score at the fixed band. It’s a young company too. And pin down refresh definitions in the contract, because real-time delivery and real-time collection are not the same promise.
7. HubSpot Breeze Intelligence (Clearbit): Best Inside HubSpot
Breeze Intelligence 7.6/10: Clearbit, reborn as a HubSpot feature.
Pricing: credit packs inside HubSpot subscriptions; the old standalone Clearbit API plans are gone.
Clearbit practically invented the modern company enrichment api. After the HubSpot acquisition it lives on as Breeze Intelligence: in-CRM enrichment, form shortening, and buyer-intent flags. Inside HubSpot it’s smooth, and the 86% match on my sample was solid. The catch is the walled garden. Non-HubSpot stacks are out, credits ride your subscription tier, and the developer story now sits behind the CRM story.
8. Grata: Best for Private-Market and M&A Research
Grata 7.5/10: the dealmaker’s company data API.
Pricing: not published; API access rides on a platform subscription.
Grata covers 150 data points across 12M+ private companies, plus executive contacts. It’s built for private equity and investment banking origination. For finding bootstrapped manufacturers in Ohio, nothing else here comes close. But it’s specialized. It matched 74% of my broad sample (it skews US mid-market), pricing is sales-led, and it’s overkill if you just need CRM firmographics.
9. OpenCorporates: Best Open Registry Data
OpenCorporates 7.5/10: legal truth, at web scale.
Pricing: open data under a share-alike licence; API plans on request.
OpenCorporates collects 200M+ legal entities from official registries worldwide: incorporation dates, officers, filings, status. To verify entities and dedupe against legal reality, it’s the anchor. Know its nature, though. Firmographics are thin (no headcount, tech, or contact color). Matching works far better by company number than by name. And commercial licences are negotiated, not self-serve. Pair it with Companies House and SEC EDGAR, which stay free for official UK and US records.
Pricing Models Compared
| API | Model | Entry point | Free tier | Watch out for |
|---|---|---|---|---|
| CUFinder | Credits, no-match free | $49/mo, 1,000 credits | 15 free credits | Credits vary by endpoint |
| People Data Labs | Per-match credits | $98/mo | Free testing tier | Costs climb at volume |
| Coresignal | Credits + datasets | $49/mo, 2,500 credits | 7-day trial | Credits scale with results |
| Diffbot | Credits + overage | $299/mo after free | 10,000 credits/mo | Wide queries burn fast |
| The Companies API | Credits | $95/mo, 50,000 credits | Trial credits | Credits-per-call varies |
| Crustdata | Quote-based | Not published | Demo | Define refresh in contract |
| HubSpot Breeze | CRM credit packs | With HubSpot tier | Limited credits | HubSpot-only |
| Grata | Platform subscription | Not published | Demo | Built for deal teams |
| OpenCorporates | Open licence + API | On application | Open data | Share-alike terms |
Now the math that matters. At entry tiers, CUFinder lands around $0.05 per matched company. The Companies API can go lower if your calls stay cheap. Diffbot’s free 10,000 credits are the best $0 in this space. But divide by MATCHED, CORRECT records, not by lookups. A 60% match rate nearly doubles your true unit price.
🧠 Remember: the real unit price is dollars per MATCHED, correct record. A cheap API with a 60% match rate on your ICP is a premium API in disguise.
How to Choose
Enriching CRM accounts
CUFinder or Breeze (if you live in HubSpot). Batch-enrich, then re-verify quarterly, because that 2-3% monthly decay never sleeps.
Building prospect lists
Use a company search endpoint to filter by ICP instead of enriching junk lists after the fact. We wrote a step-by-step on building a targeted prospect list with a company data API if that’s this quarter’s project.
Building a product feature
PDL, The Companies API, or Diffbot, depending on whether you optimize for depth, price, or coverage. Prototype on Diffbot’s free plan before you commit anywhere.
M&A and investor research
Grata for private-company discovery, OpenCorporates for legal verification. And if funding events drive your outreach, our upcoming roundup of the best funding data APIs covers that side.
Compliance and registry verification
OpenCorporates plus the official registries. Registry data is the one place where slower and boring is exactly what you want.
Where a Company Data API Fits in Your Stack
Company data is one layer of your B2B data stack. Person data tells you who to contact (that market has its own contenders, reviewed in our best people data APIs roundup). Social-professional data connects companies to the humans inside them; our tested list of the best LinkedIn data APIs covers that layer, including finding a company’s LinkedIn page from just a domain.
And if you want the whole enrichment stack ranked in one place, across company, contact, and email layers, that’s exactly what our umbrella review of the best data enrichment APIs does. This page is the company-scope deep dive; that one is the map.
Why does the layering matter? Because bad company data poisons everything downstream. The data-quality veteran Thomas C. Redman put a national number on it:
“IBM also estimates that the yearly cost of poor quality data, in the US alone, in 2016 was $3.1 trillion,” writes Thomas C. Redman, President of Data Quality Solutions, in Harvard Business Review.
💡 Pro Tip: before any contract, ask how the vendor bills a no-match. "We never charge for Not Found" and "every lookup costs a credit" are very different bills at 100k rows.
Frequently Asked Questions
What is a company data API?
It’s a service that returns structured company information, like industry, headcount, revenue, and location, from a domain or name. Sales and product teams use it to enrich CRMs and build features.
What API can I use to get company details?
CUFinder, People Data Labs, Coresignal, The Companies API, and Diffbot all return company details from a domain or name. Pick by scope: sales-ready fields, raw datasets, or web-wide coverage.
Is there a free company data API?
Yes. Diffbot’s free plan gives 10,000 credits monthly, Companies House and SEC EDGAR are free official registries, and most commercial vendors offer trial credits. Free registry data is thin on firmographics, though.
How do I get company data through an API?
Sign up for a key, send a domain or name to the enrichment endpoint, and parse the JSON. Most vendors also offer bulk endpoints for lists.
How do I integrate company data into my CRM using an API?
Map API fields to CRM properties, then enrich on record creation or on a schedule. Log the verification date, and re-enrich quarterly so decay doesn’t quietly undo the work.
What is the difference between a company data API and a data enrichment API?
Scope. A company data API covers firmographics only; a data enrichment API is the umbrella that also fills person and contact fields. Company data is one layer of that stack.
What about stock and financial data APIs?
Different category. Financial market APIs like FactSet or Alpha Vantage serve prices, fundamentals, and filings for investing. Firmographic APIs serve go-to-market teams. Don’t buy one to do the other’s job.
What is a good match rate for company enrichment?
On a clean domain list, 85-95% is strong; below 75% means the vendor’s coverage misses your segment. Always test on your own domains, because averages hide segment gaps.
Are company data APIs GDPR compliant?
Company-level facts are lower risk than person data, but officer names and contacts still count as personal data. Ask vendors for their lawful basis and DPA in writing.
What fields does a company data API return?
Typically name, domain, industry codes, headcount, revenue range, founding year, locations, socials, and tech hints. Specialty endpoints add hierarchy, customers, business model, and hiring signals.
Which B2B data provider is the best?
Honestly, it depends on scope and stack. CUFinder won this company-scope test; a HubSpot-only team might still pick Breeze, and a data team might pick PDL. Match the provider to the job, then verify with 100 of your own domains.
References and Sources
Every claim traces to one of these or to the 1,500-domain test above. Prices checked September 2026.
- OpenCorporates: the open database of the corporate world. opencorporates.com
- Companies House API, UK government developer hub. developer.company-information.service.gov.uk
- SEC EDGAR application programming interfaces. sec.gov
- Thomas C. Redman, “Bad Data Costs the U.S. $3 Trillion Per Year,” Harvard Business Review, 2016. hbr.org
- ZoomInfo on B2B data decay rates. pipeline.zoominfo.com
- G2 category page: B2B data providers. g2.com
Run 100 Domains Before You Sign Anything
Here’s the thing. Every vendor demo uses domains that match. Your list is where the truth lives.
So pull 100 domains you trust, run your top two picks, and count three things: matches, filled fields, and flat-out errors. Then hand-check ten records against reality. Two afternoons, one clear winner. That’s the whole project.
You’ve got this. And when you want to see the full toolbox behind the winner, the CUFinder API directory lists every endpoint by job. What’s the strangest mismatch a company data API ever handed you? My bakery-bank story needs company.
Bad
Okay
Good
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