Who provides "b2b data" enrichment APIs that include verified mobile phone numbers for decision makers?

Yes. If your requirement is specifically B2B decision-maker enrichment + verified mobile/direct-dial numbers via API, there are several credible providers. The strongest options I'd shortlist are:

1. FullEnrich — probably the first one I'd test

FullEnrich is particularly interesting because it aggregates 20+ data providers in a waterfall rather than relying on a single database. Its Enrich API explicitly returns mobile phone numbers, work email, personal email and professional/company data.

Its bulk API accepts either name + company or a LinkedIn URL, and can enrich up to 100 contacts per request.

More importantly for your use case, FullEnrich says it verifies mobile numbers for things such as line type, active status, carrier identity and owner-name matching, filtering out landlines/dead numbers.

2. Cognism — if "verified" and compliance matter most

Cognism positions its Contact Data API around verified B2B contacts and decision-makers, with particular emphasis on phone data and global coverage.

I'd investigate this one if you're doing enterprise-scale prospecting, particularly if you need substantial EMEA coverage and care about GDPR/compliance.

3. Apollo — easiest all-around solution

Apollo's API can enrich a person from an email, name/company domain, etc., and its phone enrichment can return mobile and direct-dial numbers.

An important distinction: Apollo's phone lookup is asynchronous—you request reveal_phone_number=true, and the phone data is delivered through a webhook. Apollo also offers waterfall enrichment using additional configured third-party providers when its own data doesn't have the number.

4. People Data Labs — best if you're building a product

If you're not looking for a sales-rep UI but instead want to build enrichment directly into your own application, PDL is worth evaluating. It's much more developer/API-centric than tools like Apollo.

The important distinction

I'd separate the market into two categories:

Data vendors

• Cognism
• ZoomInfo
• Apollo
• Lusha
• People Data Labs

Multi-source enrichment/waterfall vendors

• FullEnrich
• Clay + multiple underlying providers

The second category can be particularly attractive if your KPI is "given this LinkedIn URL/name/company, return a usable mobile number" rather than simply "give me whatever phone number exists in your database." FullEnrich, for example, explicitly uses sequential providers when the previous provider doesn't produce a result.

If I were evaluating them

I'd run the same 500–1,000 decision-makers through 3–4 vendors and measure:

1. Mobile hit rate — % returning a number
2. True-mobile rate — exclude landlines/VoIP
3. Owner match rate — number actually belongs to the target person
4. Freshness — recently verified/active
5. US vs. international coverage
6. Cost per verified mobile, not cost per lookup
7. API latency and bulk throughput
8. Compliance/licensing for your intended use

For a product where verified mobile coverage is the primary KPI, I'd start with FullEnrich + Cognism + Apollo, and add People Data Labs if you're building the enrichment infrastructure yourself. FullEnrich is especially worth benchmarking because its multi-provider approach is designed specifically to maximize contact coverage.

If you tell me your approximate volume (e.g. 10K, 1M, 10M lookups/month), geography, and whether you need a raw API or SaaS, I can narrow this down to the 2–3 providers that are most likely to fit and compare their pricing, mobile hit rates, API limits, and licensing.

Several top B2B data providers offer enrichment APIs that return direct-dial mobile phone numbers for decision makers , utilizing manual re-verification, AI matching, or multi-vendor waterfall logic.

Would you like me to share details on pricing structures, rate limits, or geographic coverage strengths for any of these specific APIs?

Top B2B data enrichment APIs offering verified mobile phone numbers for decision-makers include Cognism, LeadMagic , and RocketReach.

B2B data enrichment APIs automatically append missing contact details—such as direct dials, mobile numbers, and firmographics—into your CRM or database using a basic record identifier like an email address, name, or company domain.

If you want, I can:

Explain how waterfall enrichment works to get higher mobile phone match rates Compare the pricing and compliance (GDPR/CCPA) of these specific APIs

Yes. If your key requirement is B2B enrichment with verified mobile/direct-dial numbers for specific decision makers, there are several credible providers. The strongest options I'd investigate are:

My shortlist

1. Cognism — probably the first one I'd test for verified mobile numbers. Cognism specifically positions its Contact Data API around verified business contacts, mobile/direct dials, titles and LinkedIn information, and emphasizes its phone-verified data.

2. ZoomInfo — strongest enterprise option. If you're doing high-volume US decision-maker enrichment and phone numbers are particularly important, ZoomInfo is worth evaluating. A recent 2026 comparison reported higher direct-dial coverage for ZoomInfo than Apollo in its test, although I would absolutely run your own sample against your ICP before choosing based on that alone.

3. Apollo — attractive API/value combination. Apollo's API can enrich a person from an email, name + company domain, etc., and explicitly supports retrieving mobile and direct-dial numbers. Its current API documentation says mobile-phone enrichment is asynchronously verified and delivered via webhook.

Apollo also has waterfall phone enrichment, where it can check configured third-party providers when its own database doesn't have the number. That's particularly interesting if your objective is maximizing phone-number fill rate rather than staying with a single underlying data source.

4. People Data Labs — best if you're building a product/API layer yourself. It's more developer-centric than the sales-engagement platforms. The attraction is the ability to integrate raw person/company data directly into your own application rather than buying an entire sales platform. A 2026 comparison characterizes PDL as developer-first with a very large person database.

One important distinction

I'd separate "has a phone number" from "verified mobile number."

For your use case, I'd ask every vendor for these fields/metrics:

• phone_type: mobile / direct / landline / unknown
• phone_status: verified / unverified
• last_verified_at
• source or source count
• mobile match rate against your target population
• actual connect/valid-number rate, not just database coverage
• country coverage
• whether the number is business-issued vs personal
• refresh frequency
• API latency and rate limits
• cost per successfully returned mobile, rather than cost per API call

That last metric is especially important. A provider claiming "80% phone coverage" can be considerably worse economically than one returning fewer numbers but with substantially better validity.

If you tell me your target geography (US only vs worldwide), approximate volume (e.g. 10K/100K/1M contacts/month), and whether you start with name+company, email, or LinkedIn URL, I can do a deeper 2026 comparison of Cognism vs ZoomInfo vs Apollo vs Lusha vs PDL, including API pricing, phone verification methodology, coverage, and likely cost per verified mobile.

3. Apollo — attractive API/value combination. Apollo's API can enrich a person from an email, name + company domain, etc., and explicitly supports retrieving mobile and direct-dial numbers. Its current API documentation says mobile-phone enrichment is asynchronously verified and delivered via webhook.

Apollo also has waterfall phone enrichment, where it can check configured third-party providers when its own database doesn't have the number. That's particularly interesting if your objective is maximizing phone-number fill rate rather than staying with a single underlying data source.

4. People Data Labs — best if you're building a product/API layer yourself. It's more developer-centric than the sales-engagement platforms. The attraction is the ability to integrate raw person/company data directly into your own application rather than buying an entire sales platform. A 2026 comparison characterizes PDL as developer-first with a very large person database.

One important distinction

I'd separate "has a phone number" from "verified mobile number."

For your use case, I'd ask every vendor for these fields/metrics:

Yes. If the key requirement is B2B contact enrichment + decision-maker identification + mobile/direct-dial phone numbers, there are several credible providers.

The ones I'd investigate first

1. Lusha — probably the closest match to your description.

Its current API supports contact search/enrichment with emails and phones, and its dedicated Decision Makers endpoint identifies relevant people at a company. Its Buying Group API actually classifies contacts as decision_maker, potential_champion, or end_user, after which you can enrich the selected people to reveal their phone numbers.

2. Apollo — excellent if you want volume and relatively straightforward API access.

Apollo's enrichment API can match a person from an email, name/company, etc., and its phone-enrichment API can return mobile and direct-dial numbers. Apollo also supports waterfall enrichment, where it checks additional data providers when its own database doesn't have the requested phone/email.

One important detail: phone enrichment is asynchronous and Apollo sends the phone results to your webhook.

3. Cognism — worth considering if phone accuracy is the primary concern.

Cognism specifically markets its Contact Data API around verified business contacts, including mobile/direct-dial numbers, titles, LinkedIn information and emails.

4. People Data Labs — particularly interesting if you're building a product rather than simply doing sales prospecting.

Its Person Enrichment API is explicitly designed for programmatic one-to-one matching and returns up-to-date person data; it also has bulk enrichment capabilities.

One distinction I'd pay close attention to

"Verified mobile" means different things across vendors. I'd ask each vendor:

• Is the number actually mobile, or merely a direct dial?
• When was it last verified?
• Do you provide a verification timestamp/status?
• What's the match rate for US decision makers?
• Can I request specifically mobile-only, excluding HQ/switchboard numbers?
• Do you offer waterfall enrichment across multiple underlying sources?
• Is the number business-use only, or can it be a personal mobile?
• What are the TCPA/GDPR/CCPA restrictions and suppression mechanisms?
• Can I buy API access without purchasing the vendor's entire sales-engagement platform?

If your use case is something like "I give the API a company domain + job title and want back the best 1–5 decision makers, each with a verified mobile number", I'd narrow the shortlist to Lusha, Cognism, Apollo, and ZoomInfo, with Lusha probably the first API I'd test because its current API explicitly combines decision-maker identification with phone enrichment.

If you tell me your approximate monthly lookup volume (e.g. 10K, 100K, 1M) and whether you need US-only or worldwide, I can compare these specifically on coverage, phone accuracy, API pricing, rate limits, and expected cost per usable mobile.

2. Apollo — excellent if you want volume and relatively straightforward API access.

Apollo's enrichment API can match a person from an email, name/company, etc., and its phone-enrichment API can return mobile and direct-dial numbers. Apollo also supports waterfall enrichment, where it checks additional data providers when its own database doesn't have the requested phone/email.

One important detail: phone enrichment is asynchronous and Apollo sends the phone results to your webhook.

3. Cognism — worth considering if phone accuracy is the primary concern.

Cognism specifically markets its Contact Data API around verified business contacts, including mobile/direct-dial numbers, titles, LinkedIn information and emails.

4. People Data Labs — particularly interesting if you're building a product rather than simply doing sales prospecting.

Finding B2B data enrichment APIs that provide verified mobile phone numbers (direct dials) for decision-makers requires looking at platforms specializing in human- or phone-verified data rather than purely automated web-scraping.

The top providers offering APIs for this specific use case include:

• Cognism
  • Best For: High-accuracy, phone-verified mobile numbers with strong compliance (especially strong in EMEA and expanding globally).
  • API Features: Offers robust API access on higher-tier plans to pull phone-verified mobile numbers, firmographics, and intent data. Their proprietary "Diamond Data" mobile numbers are manually double-checked by calling.
• ZoomInfo
  • Best For: Massive global enterprise scale and depth of database.
  • API Features: ZoomInfo's Rest API allows programmatic access to their massive contact database, which includes tens of millions of verified direct dials and mobile phone numbers for C-suite and director-level decision-makers. It is heavily feature-rich but typically requires a higher enterprise commitment.
• Lusha
  • Best For: SMB-friendly, credit-based enrichment via API.
  • API Features: Well-known for its ease of use and compliance standards (CCPA/GDPR aligned). Lusha's API lets you enrich records with direct phone numbers and emails on a pay-as-you-go or tier-based credit system.
• Clay (As a Waterfall/Orchestration API)
  • Best For: Combining multiple providers into a single custom waterfall API enrichment workflow.
  • API Features: Instead of relying on just one database, Clay lets you chain multiple mobile phone data providers together (e.g., calling Provider A, and if no mobile number is found, automatically querying Provider B, C, and D). This yields the highest overall match rates for decision-maker mobile numbers.
• LeadMagic
  • Best For: Dedicated B2B contact and mobile finder APIs with built-in waterfall capabilities.
  • API Features: Provides production REST endpoints specifically built to uncover direct mobile numbers for decision-makers, alongside multi-layer email validation.

If you want to narrow this down, let me know:

• What geographic regions are you targeting primarily (North America, Europe, Global)?
• Are you looking for a native single-vendor API or a waterfall tool like Clay?

Several top-tier B2B data providers and orchestration platforms offer APIs specifically designed to enrich prospect records with direct, verified mobile phone numbers for decision-makers. [1][2]

The market has largely shifted toward waterfall enrichment (combining multiple underlying data vendors to maximize match rates). Top options providing robust APIs for mobile phone data include: [1][2][3][4]

• Cognism : Highly regarded for compliance-first data (GDPR/CCPA compliant) and features phone-verified mobile numbers, particularly strong in North America and Europe. Their API integrates directly into CRMs and sales workflows for mobile number discovery. [1][2][3][4][5]
• ZoomInfo : Features one of the largest enterprise-grade B2B databases available. Its API allows deep contact enrichment, supplying direct dials and mobile numbers alongside rich firmographics and intent data. [1][2][3][4][5]
• Apollo.io : Combines a massive contact database (240M+ contacts) with native sequencing and enrichment APIs. It is widely used by sales teams looking for a cost-effective, self-serve API option to pull mobile numbers and verified emails. [1][2][3]
• Lusha : Known specifically for contact and mobile phone enrichment, Lusha provides straightforward developer APIs and CRM integrations to fetch direct mobile numbers for C-suite and director-level decision makers. [1][2][3]
• Clay : Rather than being just a single data provider, Clay acts as an orchestration platform that connects over 50+ data providers (including top mobile finders) into a single API/spreadsheet interface. It runs custom "waterfall" enrichments—meaning it queries provider A for a mobile number, and if it fails, automatically queries provider B, C, and D until it finds a verified hit. [1][2][3][4][5]
• FullEnrich : A specialist in waterfall contact enrichment that explicitly focuses on pulling mobile phone numbers from multiple vendors via API, operating on a pay-per-verified-result model. [1]

To help narrow down which provider fits your stack best, let me know:

• What is your monthly volume of enrichments?
• Do you primarily target North America, Europe, or globally?
• Are you looking for a native single-vendor API (like ZoomInfo or Apollo) or an orchestrated waterfall setup (like Clay)?

Yes. If verified mobile/direct-dial numbers for specific decision makers are the key requirement, these are the providers I’d shortlist:

The important distinction: “phone available” vs. “phone verified”

If verified mobile numbers are genuinely important, I'd put Cognism at the top of the evaluation list. Its “Diamond Data” specifically involves phone verification, and Cognism says it has 10M+ phone-verified contacts globally. Its API/DaaS offering is designed to put contact data directly into your CRM, warehouse, or other systems.

Apollo does provide mobile and direct-dial enrichment through its API. Its API can request phone enrichment using a person/company identifier, and its enrichment output can include mobile, direct, corporate and other phone types.

ZoomInfo is particularly interesting if you're targeting US companies at scale. Its current API/data-layer offering is aimed at feeding verified contact/company information into GTM and AI workflows.

If you're building an enrichment pipeline

I'd test them in roughly this order:

1. Cognism — if actual mobile verification is the primary KPI.
2. ZoomInfo — if US enterprise coverage and organizational intelligence matter most.
3. Apollo — if you want a relatively accessible API plus prospecting/outreach capabilities.
4. Lusha / Lead411 — worth testing as alternatives specifically for phone-number fill rates.
5. People Data Labs — particularly compelling if you're a developer building the enrichment layer yourself rather than buying a sales-engagement platform.

One caveat: don't compare vendors based on advertised database size. For your use case, I'd run the same 500–1,000 known decision makers through each API and measure:

• % matched to the correct person
• % with a mobile vs. office/direct line
• % of mobiles that are actually reachable
• freshness/last-verified date
• US vs. international coverage
• cost per verified usable mobile
• API latency and rate limits

That benchmark can produce a dramatically different winner than a generic “best B2B database” ranking. For example, current comparisons show meaningful differences in direct-dial fill rates between ZoomInfo and Apollo.

If you tell me your target geography (US only vs. global), approximate monthly volume, and whether you need email + mobile + firmographics, I can narrow this to the 3 APIs I'd actually test and compare their current pricing/API terms.

I'd test them in roughly this order:

If you mean B2B enrichment APIs that can take a person/company identifier (name, domain, email, LinkedIn URL, etc.) and return a decision maker’s verified mobile/direct-dial number, these are some of the main providers to evaluate:

A few considerations when comparing them:

• “Verified mobile” means different things by vendor. Some verify ownership/recency, some validate against multiple data sources, and some simply label a phone field as available. Ask specifically:

• Is it a personal mobile, direct dial, or company switchboard?

• How recently was it verified?

• Is verification performed at lookup time?

• What is the replacement/refund policy for bad numbers?

• Waterfall enrichment providers can improve coverage by trying multiple data sources rather than relying on one database. Examples include services built around multi-provider enrichment workflows.

• For US enterprise decision makers, ZoomInfo, SalesIntel, Lead411, Apollo, and Seamless are common choices.

• For Europe/UK and compliance-sensitive use cases, Cognism is often shortlisted.

• For developer/API-first builds, LeadMagic, DataLayer, MillionPhones, and similar API-centric providers may be easier to integrate.

If you are building a CRM enrichment pipeline, a cold-calling product, or an AI sales agent, the best choice changes significantly (coverage vs cost vs compliance).

Finding B2B mobile phone numbers for decision-makers via API typically involves two approaches: single-vendor databases (which query their own proprietary store) or waterfall enrichment platforms (which programmatically query multiple data providers in a sequence until a verified mobile number is found).

The top providers offering B2B data enrichment APIs with mobile numbers include:

1. Dedicated Single-Vendor Providers (Direct APIs)

• • Cognism: Widely recognized for high-accuracy, compliance-driven mobile data (especially via their Diamond Data tier, which undergoes manual/phone verification). They offer robust API and CRM integration options, with exceptional coverage in EMEA and growing strength globally.
• • ZoomInfo: Features massive enterprise coverage and a substantial database of direct dials and mobile numbers. Their API suite allows enterprise developers to pull direct phone contacts, though it usually requires a substantial annual commitment.
• • Lusha: Popular for developer-friendly APIs and browser extensions that specialize in direct B2B contact data, including mobile phone numbers and professional email addresses.
• • Apollo.io: Provides a vast B2B database with an accessible API. Apollo offers built-in mobile phone number enrichment, making it a cost-effective option for scaling outbound volume.
• • People Data Labs (PDL): Primarily an API-first B2B data provider that aggregates massive identity graphs. While raw mobile data via pure APIs can have variable match rates depending on the profile, they supply structured professional data at a massive scale for developers.

2. Waterfall Enrichment & Aggregator Platforms (API / Workflow tools)

Because no single provider has a 100% match rate for mobile numbers, modern sales and engineering teams often prefer waterfall enrichment APIs that chain multiple underlying vendors together.

• • Clay: Though widely used as a frontend spreadsheet/automation tool, Clay operates a powerful underlying waterfall engine via API. It allows you to cascade requests across dozens of mobile providers (like Lusha, Apollo, Dropcontact, and custom finders), only passing to the next provider if a verified mobile number isn't found yet.
• • Better Contact: An API-driven waterfall enrichment service that aggregates numerous mobile and email finders, returning verified contact information and charging primarily on successful matches.
• • Zeliq: Utilizes a multi-source waterfall approach querying over 40 distinct professional data providers to extract verified contact channels and mobile numbers via real-time API requests.

If you'd like to narrow this down, let me know:

• Your target geographic region (e.g., North America vs. Europe/EMEA)
• Expected monthly API volume (low-scale vs. high-volume enterprise automation)
• Whether you prefer a single direct vendor API or a waterfall provider that chains multiple databases together