If you are building a B2B product for 2027 and need account data, the first question is not "which API has the most records." It is "which API returns intelligence I can actually act on?"
TL;DR: The five account intelligence APIs worth evaluating are Salesmotion (account-level intelligence depth), Crustdata (people and company search at scale), People Data Labs (raw contact enrichment), ZoomInfo (enterprise contact coverage) and CompanyEnrich (budget option for MVPs). Three of the five publish their pricing, and four offer an MCP server for AI agent workflows. Pick by the layer you need: structured intelligence, search breadth, or raw enrichment.
The difference matters more than most developer guides admit. A raw firmographics endpoint that returns employee count, SIC code, and a stale headquarters address is not the same as one that tells you the CFO just flagged a "strategic pivot to AI" on last quarter's earnings call. Both call themselves "account intelligence APIs." Only one of them earns the label.
I have tested dozens of B2B data APIs over the past three years. This guide covers the five that stand out going into 2027 for developers who need account-level intelligence, not just contact enrichment. Each is evaluated on data depth, pricing transparency, free tier, real-time freshness, AI capabilities, and developer experience.
Key Takeaways
- Not all B2B APIs are equal. Some return flat firmographic fields. Others return structured intelligence with AI summaries, real-time signals, and context that explains why an account matters right now.
- Free tiers matter for builders. Two APIs on this list offer ongoing free tiers (100 credits or lookups per month) that let you ship a proof-of-concept without a credit card. ZoomInfo sells API and MCP access as an add-on to its base plans.
- AI summaries are the new differentiator. One API on this list embeds AI-generated account briefs in every response. Four offer an MCP server for AI agent workflows. Most still return raw JSON fields you need to interpret yourself.
- Pricing transparency separates the developer-first APIs from the enterprise-first ones. Three of these five publish their pricing publicly. The other two require you to talk to sales.
- Pick based on your use case. Deep account intelligence, massive people search, raw enrichment, enterprise coverage, or budget MVP each point to a different winner.
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What to Look for in an Account Intelligence API
Before diving into specific tools, here is the evaluation framework that matters for developers.
Data depth vs. data breadth. Some APIs cover millions of companies with 20 fields each. Others cover fewer companies but return structured intelligence: earnings call analysis, SEC filing summaries, hiring trends, legal actions, clinical trial data. If you are building an account research product, depth wins. If you are building a lead scoring model, breadth might matter more.
Freshness architecture. How often is the data updated? Batch-refreshed monthly? Or pulled in real time when you query it? The difference between "last updated 90 days ago" and "caught and refreshed when you call the endpoint" is the difference between stale firmographics and actionable intelligence. (For more on why API-first sales intelligence is trending, see our detailed guide.)
AI capabilities. Returning raw JSON fields is now table stakes. The APIs pulling ahead embed AI-generated summaries, extract key themes from earnings calls, and synthesize hundreds of signals into a paragraph a sales rep can read in 30 seconds.
Pricing model. Credit-based? Per-seat? Per-match? Enterprise-only? If you cannot calculate your cost before you build, that is a red flag for any developer project.
MCP support. Model Context Protocol is becoming the standard for connecting AI agents to external data. APIs that support MCP (see our best MCP servers for sales) let you plug account intelligence directly into Claude, ChatGPT, or custom AI workflows without writing integration code.
“The Business Development team gets 80 to 90 percent of what they need in 15 minutes. That is a complete shift in how our reps work.”
Andrew Giordano
VP of Global Commercial Operations, Analytic Partners
The 5 Best Account Intelligence APIs in 2027
1. Salesmotion API: Best for Account-Level Intelligence Depth
The API takes a fundamentally different approach from most B2B data providers. Instead of returning flat contact records or basic firmographics, it provides structured intelligence across eight specialized endpoints: earnings calls, SEC filings, clinical trials, job postings, news, legal filings, company profiles, and AI-generated account summaries.
Every response includes an AI-synthesized brief. Query a company's earnings endpoint and you get not just the transcript, but an AI summary of the key themes, strategic shifts, and talking points that matter for a sales conversation. This is the difference between "data" and "intelligence."
Pricing:
- Free: 100 credits/month, no credit card required
- Build: $99/month for 2,500 credits ($0.04/credit)
- Scale: $299/month for 10,000 credits ($0.03/credit)
- Pro: $599/month for 25,000 credits ($0.024/credit)
Every endpoint costs 1 credit per successful response. Failed lookups and errors are free. Unused credits roll over for up to 3 billing cycles. Full pricing details are available on the API pricing page.
Strengths:
- AI summaries baked into every response, not bolted on as a separate product
- Eight purpose-built endpoints covering intelligence most APIs ignore entirely (earnings, SEC filings, clinical trials, legal)
- Real-time catch-and-refresh architecture instead of batch updates
- 1,000+ data sources aggregated per account
- MCP support for direct integration with AI agents
- Transparent, published pricing with a genuinely usable free tier
Limitations:
- Built for depth per account rather than the largest record count; Crustdata and PDL cover more companies
- Built for account intelligence; pair it with a contact data API when you need emails and phone numbers at scale
Best for: Developers building products where understanding why an account matters is more valuable than just knowing what it is. Sales intelligence tools, account research platforms, AI agent builders, and GTM automation products.
Get a free API key and test all eight endpoints with 100 credits.
2. Crustdata: Best for People and Company Search at Scale
Crustdata is a Y Combinator-backed data platform unifying company and people data from over a dozen sources. Its site cites 1B+ people and 60M+ companies, making it one of the broadest B2B data APIs available.
The core product is a set of REST APIs for searching, enriching, and monitoring companies and people in real time. Its "Watcher API" lets you set alerts for job changes, funding rounds, growth milestones, and other signals, with notification frequencies ranging from hourly to monthly. It also offers a web search API across news, web, scholar, and social sources, and a Posts API for social post search (on request).
Pricing:
- Crustdata does not publish prices; its pricing page describes credit-based usage tiers on monthly or annual plans
- Enterprise pricing through sales
- Flat-file data feeds available for bulk delivery
Strengths:
- Massive breadth: 60M companies and 1B+ people profiles
- Real-time signal monitoring via the Watcher API
- MCP integration for Claude and other AI agents
- Data aggregated from over a dozen sources, with a monthly refresh of company and people data
- CSV/JSON bulk data delivery for analytics use cases
Limitations:
- Prices are not published. Crustdata describes credit-based tiers and asks buyers to contact its team.
- Built for search and enrichment at scale rather than synthesized account briefs.
Best for: AI SDR builders, recruiting platforms, investment tools, and any product that needs to search or enrich people and companies at massive scale. If your primary question is "find me 10,000 Series B companies with 50-200 employees in fintech," Crustdata is built for that query. The Salesmotion API vs Crustdata comparison goes deeper on when each fits.
3. People Data Labs: Best for Raw Contact Enrichment
People Data Labs (PDL) is the API that developers reach for when they need raw person and company data to build their own enrichment layer. With a clean, developer-first API, PDL is designed for teams that want data primitives rather than pre-built intelligence.
PDL does not have a UI. It is a pure API product with a SQL-like search interface that lets you query the full dataset with boolean filters. If you have built enrichment products before, this is the API that feels most like a database you control.
Pricing:
- Free: Up to 100 person credits per month, without contact fields
- Pro: Starting at $98/month for 350 person credits
- Enterprise: Custom pricing
- Monthly and annual subscriptions; annual commitments save 20%
Strengths:
- Clean RESTful API with consistent endpoint patterns and SQL-like search
- Transparent, published pricing with a usable free tier
- Strong documentation and developer experience
Limitations:
- Built as a raw data layer: you get fields and build the insight layer yourself.
- Company data is secondary to person data. If you need deep account intelligence, this is the wrong tool.
- At the entry Pro rate ($98 for 350 credits, about $0.28 per credit), cost adds up at scale without an annual commitment.
Best for: Data engineering teams building custom enrichment pipelines, developers creating person-search products, and anyone who needs a reliable raw data layer to build on top of. PDL is the foundation, not the finished product. (See also: our data enrichment tools comparison for a broader view of the market.)
4. ZoomInfo API: Best for Enterprise Contact Coverage
ZoomInfo is one of the largest B2B data providers. With 500M+ contacts and 100M+ companies, it offers one of the largest contact databases in the market. The API lets enterprise teams embed ZoomInfo data directly into their tech stack.
But "enterprise" is the operative word here. ZoomInfo sells API and MCP access as an add-on to its base plans, so it fits large organizations that have budget, procurement processes, and dedicated integration teams.
Pricing:
- ZoomInfo does not publish list pricing; its own pricing page states that no specific dollar amounts are published because pricing is consumption-based
- API and MCP access is sold as an add-on to base plans
- Vendr reports a median contract of $33,500 a year based on 1,576 purchases, with a range of $7,233–$156,053
- ZoomInfo Lite is a permanent free tier with 10 credits a month (see our ZoomInfo pricing breakdown for details)
Strengths:
- One of the largest contact databases in B2B: 500M+ contacts and 100M+ companies
- Intent data (Streaming Intent add-on), org charts, and technographics
- CRM integrations and workflow automation
- Conversation intelligence, Copilot, and developer access through GTM.AI (API, CLI, and MCP server)
- If you can afford it, the contact data quality is genuinely top-tier
Limitations:
- Pricing is not published; contracts are quoted per organization.
- Paid plans are annual subscriptions, and API access is an add-on rather than a standalone self-serve product.
- International data is sold as an add-on.
- Built first for sales teams, with developer access layered on through GTM.AI.
Best for: Large enterprises with budget for a quoted annual data contract that need the broadest possible contact coverage. If your company already has a ZoomInfo contract and you want to embed that data into internal tools, the API add-on makes sense. For everyone else, there are better options.
5. CompanyEnrich: Best Budget Option for MVPs
CompanyEnrich is the lightweight option on this list. It covers 33M+ verified companies and 193M+ professional profiles through a simple REST API suite that includes company enrichment, semantic search, lookalikes, tech stack data, and reverse email lookup.
What makes CompanyEnrich stand out is not its data scale (33M+ companies and 193M+ professional profiles) but its developer experience relative to price. You can go from signup to production API calls in minutes, with transparent pricing and documentation designed for quick integration.
Pricing:
- Free trial with 500 credits
- Starter at $49/month for 5,000 credits; Pro $149/month; Scale $549/month
- Annual discounts available
Strengths:
- Most affordable option with transparent, published pricing
- Quick setup and clean documentation
- Firmographic and financial data per company
- An MCP server for agent workflows
- Semantic search and lookalike company endpoints are useful for prospecting products
Limitations:
- Database of 33M+ verified companies and 193M+ professional profiles, the smallest on this list
- Built for enrichment, search and lookalikes rather than signal monitoring or account briefs
- Data depth is basic firmographics and financials, not structured intelligence
Best for: Early-stage startups, hackathon projects, and developers building MVPs who need company data without spending $99+/month. If you need to validate a product idea with real company data and your budget is tight, CompanyEnrich gets you there.
Head-to-Head Comparison
| Feature | Salesmotion | Crustdata | People Data Labs | ZoomInfo | CompanyEnrich |
|---|---|---|---|---|---|
| Primary data type | Account intelligence | People + company search | Person enrichment | Contact database | Company firmographics |
| Companies covered | Deep intelligence | 60M | Broad | 100M+ | 33M+ |
| People covered | N/A (account-level) | 1B+ | Not stated on site | 500M+ | 193M+ |
| Free tier | 100 credits/mo | Not stated | 100 lookups/mo | ZoomInfo Lite (10 credits/mo) | 500-credit trial |
| Starting price | $0/mo (free) | Not published | $0/mo (free) | Custom, consumption-based | $49/mo |
| Pricing transparency | Full (published) | None (not published) | Full (published) | Not published; quoted per organization | Full (published) |
| AI summaries | Yes (every response) | Not a listed API | Not listed | Via Copilot | Not listed |
| Real-time data | Yes (catch-and-refresh) | Yes (Watcher API) | Not stated | Not stated | Not stated |
| MCP support | Yes | Yes | Not listed | Yes | Yes |
| Unique endpoints | Earnings, SEC, clinical trials, legal | Watcher alerts, bulk feeds | SQL-like person search | Intent data, org charts | Semantic search, lookalikes |
| Best for | Account research + AI agents | Scale people/company search | Raw data pipelines | Enterprise contact data | MVPs and prototypes |
How to Choose: Decision Framework
You need deep account intelligence for sales or research tools. The account intelligence API is the only option on this list that returns earnings call analysis, SEC filing summaries, and AI-synthesized account briefs. If your product needs to answer "what is happening at this company and why should I care," start with the free tier.
You need to search and enrich people and companies at massive scale. Pick Crustdata. A billion people profiles with real-time signal monitoring is hard to beat for AI SDR products, recruiting platforms, or investment screening tools.
You need raw person data to build your own enrichment layer. Pick People Data Labs. The SQL-like search API and published per-credit pricing make it the most developer-friendly option for custom data pipelines.
You are an enterprise team with budget and need the deepest contact database. Pick ZoomInfo. If your organization already has a ZoomInfo contract and you need API access to embed it, ZoomInfo's coverage is among the broadest available.
You are building an MVP and need affordable company data fast. Pick CompanyEnrich. At $49/month with transparent pricing and quick setup, it is the lowest-friction way to get company data into a prototype.
For most developers building AI-powered B2B products in 2027, the real decision comes down to what layer of intelligence you need. Contact data, firmographic fields, and company search are increasingly commoditized. The APIs that stand out are the ones returning structured intelligence with AI interpretation baked in, because that is the layer your users actually need.
Frequently Asked Questions
What is an account intelligence API and how is it different from a contact database API?
An account intelligence API returns structured information about what is happening at a company: earnings call themes, strategic initiatives, hiring trends, legal filings, and AI-generated summaries. A contact database API returns information about people: emails, phone numbers, job titles, and employment history. They solve different problems. Contact APIs answer "who works there and how do I reach them?" Account intelligence APIs answer "why should I care about this company right now?" Many B2B products need both layers, but they come from different providers.
Can I use these APIs with AI agents like Claude or ChatGPT?
Four of the five APIs here list a Model Context Protocol (MCP) server (what an MCP server does for sales tools): the account intelligence API listed first, Crustdata, ZoomInfo, and CompanyEnrich. MCP lets you connect an API directly to Claude, ChatGPT, or custom AI agent frameworks so the model can query account data in real time during a conversation. For People Data Labs, you would connect its REST API through a function-calling wrapper or tool definition to use it with AI agents.
Which API has the best free tier for developers?
The account intelligence API listed first and People Data Labs both offer genuinely usable free tiers. The former gives you 100 credits per month with access to all eight endpoints and no credit card required. PDL's free plan includes up to 100 credits per month. CompanyEnrich provides a one-time 500-credit trial but no ongoing free plan. Crustdata's pricing page does not state whether a free tier or trial is available. ZoomInfo Lite is a permanent free tier with 10 credits a month, with API access sold as an add-on to base plans. For testing and prototyping, the account intelligence API's free tier is the most complete because it includes AI summaries and all endpoint types, not just basic lookups.
How much does it cost to enrich 10,000 accounts per month?
The cost varies dramatically. With the Scale plan on the account intelligence API at $299/month for 10,000 credits, you pay $0.03 per account with full AI summaries included. People Data Labs prices person enrichment per credit, so cost scales with the number of records you enrich. Crustdata does not publish prices, so you would need to ask its team. ZoomInfo does not publish list pricing either; Vendr reports a median contract of $33,500 a year based on 1,576 purchases. CompanyEnrich would be the cheapest for basic firmographics but does not provide the same intelligence depth or people coverage as the higher-priced options.
