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SMARTe GTM Intelligence
Start Smarter Prospecting Today
A company data API is a tool that automatically feeds clean, accurate, and up-to-date business information into your software. This is essential because company data changes all the time. Job titles, phone numbers, office locations, and tech stacks become outdated quickly, which can hurt your sales and marketing efforts.
A business data API connects directly to your CRM or other applications. It works in the background to "enrich" your records. This means it can find missing details, fix errors, and add valuable new information.
Different teams use these APIs to solve specific problems:
- Sales teams use a lead enrichment API to find direct dials and build better lead lists.
- Marketing teams use a business data API to understand who visits their website.
- Analysts use a company lookup API to research competitors or find investment details.
Choosing the right API is key. Some are great for sales, while others are built for marketing or risk analysis. This guide reviews the 11 best options to help you find the right fit for your needs.
Here is the 11 top contact and business data API in 2025:
1. SMARTe API
SMARTe provides a B2B data API for sales and marketing teams. It's designed to help you find and engage with customers, especially at a global level. The API gives you access to a large database of company and contact information.
A main feature is the "Enrich API." It cleans your existing data in your CRM or marketing tools. It can add new contact details, fix errors, and update records when people change jobs. This keeps your b2b contact database fresh and useful.
SMARTe also offers a "Signals API." This tool sends you real-time alerts about important company events. You can get a notification when a company gets new funding, partners with another business, or expands. This helps your sales team know the perfect time to reach out.
Key Features
- Data Enrichment: Cleans, completes, and updates your existing contact and company records.
- Signals API: Delivers real-time alerts for business events like funding, mergers, or new partnerships.
- Global Data: Provides a large database of international B2B contact and company information.
- CRM Integration: Works to enhance data inside platforms like Marketo and Salesforce.
- Ad Retargeting: Appends detailed information to help you create more specific ad campaigns.
Pricing
SMARTe offers flexible pricing for every need. The Pro plan costs $25 for 50 credits and includes API access for automated data enrichment. The Enterprise plan starts at $15,000 with full API access, bulk credits, and custom integrations for large teams.
2. Clearbit API
Clearbit is a popular data enrichment API known for its speed and ease of use. It's a favorite for marketing and product teams. The API is built to take a small piece of information, like an email or a website domain, and return a full profile.
You can use it to make your sign-up forms shorter. A new user enters their work email, and Clearbit can auto-fill their company name, size, and location. This makes for a better user experience.
Its "Reveal" feature is also very useful for marketers. It can identify the companies that visit your website, even if they don't fill out a form. This turns your anonymous traffic into a new list of potential leads. While access for new accounts has changed, its core tools remain powerful for in-platform enrichment.
Key Features
- Company and Person Enrichment: Returns over 100 data points for companies (like industry and tech used) and individuals (like role and seniority).
- Reveal API: Identifies anonymous companies visiting your website from their IP address.
- Name to Domain API: A free tool that finds a company's website domain when you give it the company's name.
- Developer-Friendly: Offers clean and well-documented REST APIs. It also has libraries for languages like Python and Node.js.
- Webhook Support: Can send you real-time data updates so your systems are always in sync.
Pricing
Clearbit's pricing is now part of its paid plans.
- Free Tools: The Name to Domain API is still free to use.
- Business Plans: Full API access is included in paid plans. These are quote-based, and you must contact their sales team. They charge based on your API request volume and the features you need.
3. ZoomInfo API
ZoomInfo is one of the biggest names in B2B data. Sales teams often rely on it for high-quality contact information. Its API provides a gateway to this large database, which is known for having accurate direct-dial phone numbers and verified emails.
This is much more than a simple contact data API. It's a full sales intelligence API. You can use it to search for companies using very specific filters. For example, you can find companies in a certain industry, with a specific revenue, that also use a particular software.
The API can also send you "Intent Signals" and "Scoops." These are alerts about company news or online research that suggest a company might be ready to buy. This helps sales teams focus on leads who are most active.
Key Features
- Deep Contact Data: Access to a large, accurate database of B2B contacts, known for quality phone numbers.
- Intent Data & "Scoops": Provides alerts on company news and buying signals.
- Technographics: Lets you see what software and technology a company uses.
- Bulk & Webhook Support: You can process large lists in batches and get real-time data updates.
- Company Hierarchies: Shows you org charts so you can find the right decision-makers.
Pricing
ZoomInfo is a premium, enterprise-level tool. All pricing is custom and quote-based. You must contact their sales team, who will create a package based on your data needs, the number of users, and your API usage.
4. Apollo.io API
Apollo.io has grown quickly into a full AI sales platform. Its API is very powerful because it connects to both its large database and its sales tools. This means you can use the API to do more than just get data.
Most APIs just give you information. The Apollo API lets you take action. You can use it to find a new prospect and then automatically add that person to an email sequence. You can also create tasks in your CRM or log a call.
This makes it a top choice for automating sales. Best of all, API access is included even in Apollo's free plan. This is very rare and lets anyone start building automated workflows without a big cost.
Key Features
- Large Prospecting Database: Lets you search a database of over 270 million contacts and 70 million companies.
- Workflow Automation: You can use the API to add contacts to email sequences, create tasks, and manage sales pipelines.
- Data Enrichment: Updates your existing records with verified emails, phone numbers, and company details.
- Generous Free Access: The API is included in all plans, even the free one, with certain limits.
- Modern API: A well-documented REST API that uses API keys for simple use or OAuth 2.0 for building apps.
Pricing
Apollo has a very clear pricing model, and the API is included in all plans.
- Free Plan: Includes API access with a limited number of credits and requests.
- Basic & Professional Plans: Offer more credits and higher API limits at a per-user, per-month cost.
- Custom Plan: For enterprise needs with custom credit amounts and API support.
5. Cognism API
Cognism focuses on providing high-quality, compliant B2B data. In a world with strict privacy laws like GDPR, this is a major benefit. The Cognism API gives you access to a B2B data API that is checked for compliance.
This gives b2b sales and marketing teams peace of mind, especially when selling in Europe. Cognism is known for its "Diamond Data." This is a special set of contact information, especially mobile numbers, that has been verified by a human research team.
The API is built to work smoothly with your CRM, like Salesforce or HubSpot. It automates the data enrichment process so your records stay accurate. It's a great choice for teams who believe data quality and legal compliance are more important than just data quantity.
Key Features
- Global Data Compliance: A strong focus on GDPR and other privacy laws, making it a safe choice for global outreach.
- "Diamond Data": A premium, human-verified list of mobile numbers for higher connection rates.
- Firmographics & Technographics: Provides details on company size, industry, location, and the software they use.
- Intent Data: Helps identify companies that are actively researching topics related to your product.
- CRM Integration: Designed to keep your CRM data clean and up-to-date automatically.
Pricing
Cognism uses a custom, quote-based model. The price depends on your specific needs, like which data packages you choose (e.g., North America, Europe) and your number of users. You must schedule a demo to get a quote.
6. Crunchbase API
While many APIs focus on sales contacts, Crunchbase is the leading source for startup and funding data. If your business needs to track which companies are getting funding, who their investors are, and which businesses are being acquired, this is the API for you.
Think of it as a market intelligence API, not a sales contact API. You can't use it to get a list of phone numbers. Instead, you use it to find answers to big-picture questions. For example, you could get a list of all software companies in a city that raised a Series A round in the last six months.
Developers use this API to build internal tools for market research or to find new investment opportunities. It's a read-only service, meaning you can only "get" data from it.
Key Features
- Top-Tier Funding Data: The most complete data on funding rounds, investors, valuations, and acquisitions.
- AI-Powered Insights: Uses AI to predict which companies are likely to grow, get funding, or be acquired.
- Advanced Search: Lets you search the entire database with complex filters to find specific trends or companies.
- Basic vs. Full API: A free "Basic API" gives limited access to company info. The "Full API" unlocks the entire dataset.
- Relationship Mapping: Shows how companies, investors, and founders are connected.
Pricing
Crunchbase has two main tiers for API access.
- Basic API: Free when you register for a Crunchbase account. It offers limited access to basic company information.
- Full API (Crunchbase Data): This is part of their paid Enterprise or Applications plans. It is quote-based, and you must contact sales. The price depends on how much data you need.
7. Lusha API
Lusha is well-known by sales teams for one main thing: finding accurate contact details, fast. It built its reputation on providing reliable direct-dial phone numbers and verified email addresses. The Lusha API lets you build this speed and accuracy into your own tools.
This makes it a top-tier contact data API. Sales teams use it to enrich their lead lists quickly. Instead of searching manually, they can find someone's phone number automatically.
The API is simple to use. You can send it a person's name and company, and it sends back the contact details it finds. Lusha has also added more features, like a prospecting API and "Signals" (like job changes), making it a more complete sales intelligence API.
Key Features
- Accurate Contact Data: A strong focus on providing verified direct-dial phone numbers and email addresses.
- Simple Endpoints: Easy-to-use API for enriching individuals, getting company info, or prospecting for new leads.
- Buying Signals: The Signals API alerts you to key events, like when a prospect changes jobs.
- Bulk API: Lets you process large lists of contacts or companies at one time.
- Easy Integration: Clear documentation and support for automation tools like Zapier.
Pricing
Lusha's pricing is based on credits. You use credits for each API call or data reveal.
- Free Plan: Gives you a small number of free credits each month to test the service.
- Pro & Premium Plans: Offer a larger number of credits per month on a paid subscription.
- Scale (Enterprise) Plan: A custom, quote-based plan for large teams with high data needs.
8. PitchBook API
If Crunchbase is for the startup world, PitchBook is for the entire private financial market. This API is the main tool for professionals in private equity, venture capital, and M&A. It provides access to the same expert-vetted data that powers its well-known desktop platform.
This is a serious business data API built for financial analysis and due diligence. You would not use it for simple sales prospecting. You would use it to build financial models, track fund performance, or find detailed info on private company valuations.
The PitchBook API lets you pull very specific data points about companies, deals, investors, and funds. This allows you to integrate this high-level intelligence directly into your own internal dashboards and software.
Key Features
- Deep Private Market Data: Extremely detailed data on M&A, venture capital, private equity, and company valuations.
- Real-Time Event Tracking: Lets you use code to monitor key financial events like funding rounds or acquisitions.
- Flexible Data Access: A modern RESTful API that lets you pull just the specific data points you need.
- Expert Support: PitchBook provides support to help your team integrate the API into your systems.
- System Agnostic: Designed to work with any system, from a CRM to a custom-built financial analysis tool.
Pricing
Access to the PitchBook API is custom and quote-based. It is a premium, high-cost tool for financial firms and large enterprises. You must talk to their sales team for a consultation and price.
9. FullContact API
FullContact's API has a unique strength: identity resolution. It is built on the idea of understanding a whole person, not just a business contact. Its "Person-Centered Graph" can take small pieces of info—like an email, a phone number, or a Twitter handle—and connect them.
The API then returns a single, complete profile of that person. This makes it a powerful data enrichment API for both B2B and B2C companies.
For a B2B sales team, it can enrich a lead's professional data and also show their public social media profiles. For a B2C marketing team, it can help personalize a customer's experience. You can use it in real-time to learn more about a new user who just signed up or to give a customer support agent more context about the person they're helping.
Key Features
- Identity Resolution: Its main feature. It links many different data points (email, phone, social) into one person.
- Person & Company Enrichment: Provides rich data for individuals (social profiles, job history) and companies (size, location).
- Data Verification: Can verify emails and perform phone number lookup to check if contact details are valid.
- Real-time & Batch: You can look up one person at a time (real-time) or upload a large list (batch).
- Privacy Focused: Built to be compliant with privacy laws like GDPR and CCPA.
Pricing
FullContact offers a usage-based pricing model.
- Free Trial: You get a set number of free API calls to test the platform.
- Pro & Enterprise Plans: These plans are quote-based. The price is based on how many successful API matches you get per month.
10. Dun & Bradstreet (D&B) API
Dun & Bradstreet is one of the oldest and most trusted names in business data. Its entire system is built on the D-U-N-S® Number. This is a unique nine-digit ID for businesses that is used as a global standard, often for government contracts or setting up new supplier accounts.
The D&B API is not for sales prospecting. It is a serious business data API for risk, compliance, and master data.
Companies use this API to automate important tasks. This includes checking a new customer's credit risk, verifying a new supplier's financial health, or making sure the business is not on a sanctions list. It is the API you use when you need to be 100% sure a business is real and trustworthy.
Key Features
- The D-U-N-S® Number: The core of the API. It is used to find, validate, and link company records.
- Finance & Credit Risk Data: Gives you access to D&B's financial stress and payment scores (like PAYDEX®).
- Risk & Compliance: Automates checks for KYC/AML (Know Your Customer/Anti-Money Laundering) and screens for beneficial ownership.
- Master Data Management: Helps companies create a "single source of truth" for all their customer and supplier data.
- Modern API: D&B's new APIs are modern (RESTful, JSON) and use secure authentication.
Pricing
Dun & Bradstreet provides enterprise-level, quote-based contracts. API access is customized based on the data you need (finance, risk, etc.) and your call volume. You must speak with their sales team.
11. Coresignal API
Coresignal is a modern company data API that provides fresh data from the public web. It has a very large database of over 67 million company profiles and hundreds of millions of employee profiles. This makes it a great choice for market research, talent recruiting, and building data-driven products.
The API is very flexible. You can either search for new companies based on filters (like industry or size) or enrich the data you already have.
A key feature for developers is its support for Elasticsearch Query DSL. This is a powerful tool that lets you build very complex and specific search queries. You can filter across more than 300 different data points for each company, including their tech stack, funding, and online presence.
Key Features
- Large Public Database: Access to 67M+ company profiles and 600M+ professional profiles.
- 300+ Data Points: Provides very deep, structured data on each company.
- Advanced Querying: Supports Elasticsearch DSL, allowing for highly custom and complex searches.
- Fresh & Compliant: Data is constantly updated from public sources. The company follows ethical data collection practices.
- Flexible Search & Enrich: You can either find new data or append data to your existing records.
Pricing
Coresignal uses a clear, credit-based, pay-as-you-go model.
- Free Trial: You get free credits to get started and test the API.
- Credit-Based Plans: You buy credits in advance and use them as you make API calls. This lets you pay for only what you use and scale up as you grow.
Company Data API Comparison Table
How to Choose the Right Company Data API
The best API for you depends on your specific goal. No single API is the best at everything.
- For Sales Prospecting (Contact Info): Look at SMARTe, ZoomInfo, Lusha, or Cognism.
- For an All-in-One Sales Platform: SMARTe and Apollo.io is a strong choice. It combines a large database with sales automation tools.
- For Marketing & Enrichment: Clearbit is great for B2B websites and identifying visitors. FullContact is better for getting a deep, 360-degree view of an individual person.
- For Financial & Startup Research: Crunchbase is the standard for tracking startups and funding. PitchBook is the premium choice for deep private market and M&A analysis.
- For Risk & Compliance: Dun & Bradstreet is the global standard for verifying a business's financial health and legal standing.
- For Fresh Data & Custom Projects: Coresignal offers a large, fresh, and flexible database that is ideal for data science, recruiting, and market research.
The best way to start is to pick the API that best matches your goal. Then, sign up for a free trial or use the free plan to test the data quality for yourself.
