Tools & Stack20 min read·
API Library: Claude x Cold-Email
Master API list for cold email and GTM systems — 19 categories covering marketplaces, scrapers, enrichment, verification, signals, and more.
Master API List for Cold Email / GTM Systems
1. Broad API Marketplaces Like RapidAPI
These are the places to search when you want lots of random APIs, not just B2B data.
| Marketplace | What to search for | Use case |
|---|---|---|
| RapidAPI | "Google Maps", "email finder", "web scraper", "company data", "domain lookup", "SERP", "LinkedIn", "phone validator" | Broadest general API marketplace. Useful for quick testing. |
| Apify Store | "Google Maps scraper", "LinkedIn scraper", "website crawler", "directory scraper", "email extractor", "Facebook Marketplace scraper" | Best marketplace for scrapers and automations. Apify is more of an execution platform than just an API catalog. |
| API.market | AI APIs, maps APIs, data APIs, scraping APIs, media APIs | General API + AI model marketplace with categories like AI models, maps, image generation, text-to-video, and data APIs. |
| ApyHub | Web parsing, marketing/SEO, AI, ecommerce, file conversion, utility APIs | Good general API marketplace for developers/AI agents, especially utility APIs and web parsing. |
| APILayer | Email verification, geolocation, finance, stock, content, AI/ML, scraping-lite utilities | More curated utility/API marketplace. Good for stable building blocks. |
| Zyla API Hub | Email verification, phone validation, company lookup, social APIs, OCR, AI, finance, scraping | RapidAPI alternative with many utility APIs. |
| Postman API Network | Public APIs, official workspaces, API collections | Better for discovering official APIs and testing endpoints, not necessarily buying data. Postman says its API Network lets consumers discover public workspaces, collections, APIs, and flows. |
| AWS Marketplace | Data APIs, SaaS APIs, software APIs, enrichment tools | More enterprise/procurement-oriented. Useful if you want reliable vendors that sell through AWS. |
| AWS Data Exchange | Alternative data, API datasets, business data, identity data, market intelligence | AWS specifically supports API data products through AWS Data Exchange. |
| Snowflake Marketplace | Live datasets, apps, third-party data, identity, geospatial, financial, marketing data | Best if you want data products inside a warehouse environment. Snowflake describes it as live, ready-to-query datasets, applications, and services. |
| Datarade | B2B leads, firmographics, intent data, location data, consumer data, financial data | Data marketplace, not pure API marketplace. Useful for finding data vendors. |
| data.world | Public/private datasets, enterprise data catalog | Useful for research/data discovery, less "plug-and-play cold email." |
| Nasdaq Data Link | Financial, economic, alternative datasets | Useful for finance, market intelligence, company/event signals. |
| LiveRamp Data Marketplace | Audience data, identity data, marketing segments | Useful for paid media/audience strategy more than cold email. |
| Databricks Marketplace | Datasets, AI models, data products | Useful if your stack is warehouse/lakehouse-based. |
| Google Cloud Marketplace / BigQuery Public Datasets | Datasets, APIs, cloud services | More enterprise/cloud-native. Useful for structured market datasets. |
| Kong Konnect API Catalog | Internal/external API discovery | More for managing APIs than discovering random GTM APIs. |
| MuleSoft Anypoint Exchange | Enterprise API marketplace/catalog | More enterprise/internal API discovery. |
| Gravitee API Marketplace | Internal/external API marketplace infrastructure | Useful if you're building your own API portal. |
| Pipedream App/API Marketplace | App integrations, workflow APIs, event triggers | Useful for connecting APIs into GTM automations. |
| Make App Marketplace | Automation modules, API connectors | Useful for turning APIs into workflows without much code. |
| n8n Integrations / Templates | API workflows, enrichment chains, scraping flows | Useful for self-hosted GTM workflow automation. |
| Zapier App Marketplace | SaaS connectors and triggers | Better for li |
2. Scraper / Extraction API Marketplaces
These are where you find tools for scraping websites, directories, social sites, marketplaces, job boards, and search results.
| API / Platform | Category | Use case |
|---|---|---|
| Apify | Scraper marketplace | Google Maps, directories, LinkedIn-style pages, ecommerce, websites, reviews, social, job boards. |
| Bright Data | Enterprise scraping + datasets | Large-scale web data collection, proxies, datasets, SERP, ecommerce, social, public web. |
| Oxylabs | Enterprise scraping/proxy APIs | SERP scraping, ecommerce, public web data, anti-bot infrastructure. |
| ScraperAPI | Web scraping API | Extract pages without managing proxies/CAPTCHAs. |
| ScrapingBee | Web scraping API | Handles proxies and headless browsers; also has marketplace/ecommerce scraper APIs. |
| Zyte | Web scraping API/platform | Managed extraction, smart proxy, Scrapy ecosystem. |
| Crawlbase | Crawling/scraping API | Large-scale URL crawling and extraction. |
| ZenRows | Web scraping API | Anti-bot, JS rendering, rotating proxies. |
| Firecrawl | AI-ready web scraping/crawling | Search, scrape, parse, and turn websites into clean Markdown/structured data for AI agents. |
| Jina Reader API | Web-to-LLM readable content | Turn URLs into clean text/Markdown for AI workflows. |
| Browserless | Headless browser API | Run browser sessions for scraping, screenshots, automation. |
| Diffbot | Web extraction / knowledge graph | Extract structured articles, products, organizations, people, and web entities. |
| Scrapingdog | Scraping + Google Maps API | Web extraction, Google Maps data. |
| Scrap.io | Maps/business scraper | Google Maps, Apple Maps, Bing Maps business extraction. |
| Outscraper | Local data scraping | Google Maps, reviews, emails, phones, local business data. |
| PhantomBuster | Automation/scraping templates | LinkedIn, Google Maps, social, directories, profile enrichment. |
| TexAu | Growth automation | LinkedIn, Google search, scraping, enrichment, workflow automations. |
3. Google Maps / Local Business Data APIs
Use these for local SMB GTM: contractors, clinics, equipment dealers, restaurants, commercial services, franchises, etc.
| API | Use case |
|---|---|
| DataForSEO Google Maps API | Pull local businesses from Google Maps/search areas; DataForSEO says its Maps API can access up to 700 business listings in a specific area. |
| SerpApi Google Maps API | Extract structured Google Maps/local results like title, reviews, rating, address, phone, hours, coordinates, links, etc. |
| Outscraper Google Maps API | Google Maps businesses, reviews, emails, phones, websites. |
| Apify Google Maps Scraper | Marketplace actor for extracting map listings and business details. |
| ScraperAPI Google Maps Scraper | Structured Google Maps extraction. |
| Scrapingdog Google Maps API | Google Maps local business extraction. |
| Scrap.io | Multi-map extraction from Google Maps, Apple Maps, Bing Maps. |
| Bright Data Google Maps / local datasets | Enterprise-grade local business extraction/datasets. |
| Places API providers | Official/place-style business data depending on source and permissions. |
| Foursquare Places API | Venue/place data, location intelligence. |
| Yelp Fusion API | Local business/review/category data where available. |
| Mapbox Search API | Location/place search, geocoding, POI data. |
| HERE Places / Search API | Business/location search and geospatial data. |
| TomTom Search API | POI and location search. |
4. SERP / Search Engine Data APIs
These are useful for finding companies based on Google results, local rankings, SEO signals, directories, and buying-intent keywords.
| API | Use case |
|---|---|
| DataForSEO SERP API | Google/Bing/Yahoo SERP data, SEO, keywords, rankings, maps, business data. |
| SerpApi | Real-time Google/search results API; SerpApi says it handles proxies, CAPTCHA solving, and structured SERP parsing. |
| Serper.dev | Cheap Google Search API alternative. |
| Scale SERP | Google SERP API. |
| Zenserp | SERP extraction. |
| ValueSERP | Google search results API. |
| Bright Data SERP API | Enterprise SERP data. |
| Oxylabs SERP Scraper API | Search engine results at scale. |
| ScraperAPI SERP endpoints | SERP scraping through ScraperAPI. |
| Tavily API | AI search/research API. |
| Exa API | Neural/web search API for finding relevant pages and companies. |
| Perplexity Sonar API | Answer/search API for research workflows. |
| Brave Search API | Search API, useful since Bing Search APIs were discontinued in 2025 for many developers. |
| Mojeek API | Independent search API. |
5. Website Crawling / Company Website Intelligence APIs
Use these when you have domains and want to crawl the website to find signals.
| API | Use case |
|---|---|
| Firecrawl | Crawl site → clean Markdown/structured data. |
| Apify Website Content Crawler | Crawl websites and extract structured content. |
| Diffbot Analyze API | Convert pages into structured entities. |
| Jina Reader | URL → clean LLM-readable text. |
| Crawlbase | Large-scale crawling. |
| ScrapingBee | Headless browser/proxy-powered crawling. |
| ScraperAPI | Generic web extraction. |
| Browserless | Browser automation and screenshots. |
| URLScan.io API | Website intelligence, security/tech signals. |
| Microlink API | URL metadata, screenshots, unfurling, link previews. |
| ScreenshotOne | Website screenshots. |
| HTMLCSStoImage | Render HTML/images for lead magnets or personalized screenshots. |
| PageSpeed Insights API | Website speed/performance signal. |
| Lighthouse CI / CrUX APIs | Performance/Core Web Vitals signals. |
| BuiltWith Domain API | Current/historical tech stack and metadata. |
| Wappalyzer API | Technology lookup, lead lists, subdomains, website alerts, email verification. |
6. Technographic APIs
Use these to target companies based on tools they use.
| API | Use case |
|---|---|
| BuiltWith API | Find companies using specific tech, competitor tools, ecommerce platforms, CRMs, analytics, etc. |
| Wappalyzer API | Lookup website tech stack, create lead lists, monitor technology changes. |
| SimilarTech | Technology adoption data. |
| Rhetorik | Enterprise technographic/company data. |
| HG Insights | Enterprise install-base and tech intelligence. |
| Slintel / 6sense technographics | Buyer intent + technology usage. |
| Datanyze | Technographics and contact data. |
| WhatRuns / Ful.io | Tech stack detection, depending on API availability. |
| PredictLeads Technographics API | Company technology signals; PredictLeads says it provides news events, job openings, technographics, financing events, products, and more across 100M+ companies. |
7. Job Posting / Hiring Signal APIs
These are powerful for cold email because hiring often signals pain, budget, and timing.
| API | Use case |
|---|---|
| PredictLeads Jobs API | Track job openings, hiring signals, company growth triggers. |
| TheirStack API | Track companies by jobs, tech stack, roles, and hiring signals. |
| Coresignal Jobs API | Job postings, company data, employee data. |
| Adzuna API | Job postings data. |
| Reed API | Job listing data, mostly UK-heavy. |
| Jooble API | Job search data. |
| USAJobs API | Government hiring data. |
| Greenhouse Job Board API | Jobs from Greenhouse-hosted boards. |
| Lever Postings API | Jobs from Lever-hosted boards. |
| Ashby Job Board API | Jobs from Ashby-hosted boards. |
| Workable API | Recruiting/job data depending on access. |
| SmartRecruiters API | Job/recruiting data depending on access. |
| Breezy HR API | Recruiting/job data. |
| RemoteOK API | Remote job listings. |
| Remotive API | Remote job listings. |
8. Company Signal / Intent APIs
Use these to trigger campaigns based on events.
| API | Use case |
|---|---|
| PredictLeads | News events, job openings, technologies, financing events, products, webhooks. |
| Crustdata | Company/person data, signals, LinkedIn-style datasets. |
| Coresignal | Company, employee, jobs, firmographic datasets. |
| People Data Labs Company API | Company enrichment and firmographic data. |
| Clearbit / HubSpot Breeze Intelligence | Company enrichment, firmographics, reveal. |
| Similarweb API | Traffic, competitive intelligence, web analytics. |
| Semrush API | SEO, PPC, keyword, domain analytics. |
| Ahrefs API | Backlinks, SEO, domain authority signals. |
| Moz API | Domain authority, SEO metrics. |
| SpyFu API | Competitor keywords and PPC intelligence. |
| Crunchbase API | Funding, acquisitions, company profiles. |
| Dealroom API | Startup/funding/company intelligence. |
| Tracxn API | Startup/company intelligence. |
| Owler API | Company news, competitors, revenue estimates. |
| G2 Buyer Intent / Marketplace data | Software intent and review signals. |
| Bombora API | B2B intent topics. |
| 6sense API | Account intent and predictive scoring. |
| ZoomInfo Intent / Enrich APIs | Company/contact + intent. |
| Demandbase API | ABM/intent/account intelligence. |
9. B2B Data / Contact Enrichment APIs
| API | Use case |
|---|---|
| BlitzAPI | API-first GTM enrichment: smart ICP targeting, verified email/phone enrichment, catch-all validation, people enrichment, LinkedIn/company enrichment, waterfall ICP. BlitzAPI positions itself as API-first GTM data infrastructure. |
| LeadMagic | API-first enrichment for GTM engineers and AI agents; verified contact data, company intelligence, intent signals, REST API, CLI, and MCP. |
| People Data Labs | Person/company enrichment. |
| Apollo API | People enrichment, contact enrichment, company data. |
| Prospeo API | Email finding, phone numbers, enrichment. Prospeo positions around verified business emails and mobile numbers. |
| Hunter API | Domain search, email finder, verifier. |
| Snov.io API | Email finder, verifier, prospecting workflows. |
| Dropcontact API | Email enrichment, cleaning, dedupe, verification. |
| FullEnrich API | Waterfall enrichment across multiple providers. |
| Findymail API | B2B email finding/verification. |
| Kaspr API | B2B phone/email enrichment. |
| Lusha API | Contact and company enrichment. |
| RocketReach API | Contact lookup and enrichment. |
| ContactOut API | Contact data enrichment. |
| Seamless.ai API | Contact/company data. |
| LeadIQ API | Contact capture/enrichment. |
| Cognism API | B2B contact/company data, phone-focused. |
| Clearbit API | Company/person enrichment. |
| ZoomInfo API | Enterprise B2B contact/company data. |
| SalesIntel API | Contact/company enrichment. |
| Uplead API | B2B contacts and verification. |
| LeadGenius | Custom B2B data/research. |
10. Email Finder APIs
| API | Use case |
|---|---|
| Hunter Email Finder | Name + domain → work email. |
| Snov.io Email Finder | Find email by name/domain/company. |
| Prospeo Email Finder | Find verified work emails. |
| Findymail | Email finder for B2B prospects. |
| Dropcontact | Contact enrichment and email discovery. |
| FullEnrich | Waterfall email finding. |
| LeadMagic | Contact enrichment/email finding. |
| BlitzAPI | Verified email enrichment. |
| Apollo | Contact/email enrichment. |
| People Data Labs | Person profile enrichment. |
| RocketReach | Email/phone lookup. |
| ContactOut | Email/phone lookup. |
| Lusha | Email/phone lookup. |
| Kaspr | Email/phone lookup. |
| VoilaNorbert | Email finding. |
| Anymail Finder | Email finding. |
| GetProspect | Email finding. |
| AeroLeads | Email finding. |
11. Email Verification APIs
| API | Use case |
|---|---|
| ZeroBounce | Email validation, deliverability, risk scoring. |
| NeverBounce | Email verification and list cleaning. |
| Bouncer | Email verification. |
| Emailable | Email verification. |
| Kickbox | Email verification. |
| Hunter Verifier | Verify emails found through Hunter or other sources. |
| Snov.io Verifier | Verify email lists. |
| Mailboxlayer | Syntax, SMTP, disposable, deliverability checks. |
| Abstract Email Validation | Email quality/deliverability scoring. |
| Clearout | Email verification and finder. |
| DeBounce | Email verification. |
| Verifalia | Email verification. |
| MillionVerifier | Bulk email verification. |
| BriteVerify | Enterprise verification. |
| Mailgun Email Validation | Validation within Mailgun ecosystem. |
12. Phone Validation / Carrier APIs
Useful if you add SMS, calling, or phone enrichment.
| API | Use case |
|---|---|
| Twilio Lookup API | Validate phone number, carrier, line type. |
| Numverify / APILayer | Phone validation. |
| Abstract Phone Validation | Validate phone numbers and metadata. |
| Vonage Number Insight API | Carrier/line type/number intelligence. |
| Telesign Phone ID | Phone risk and identity signals. |
| Neutrino Phone Validate | Phone validation. |
| Veriphone API | Phone number validation. |
| Loqate Phone Validation | Global phone validation. |
13. Domain / DNS / Email Infrastructure APIs
Domain scoring, mailbox setup, and outbound infra checks.
| API | Use case |
|---|---|
| Cloudflare API | DNS setup, domain records, routing, security. |
| GoDaddy API | Domain/DNS management. |
| Namecheap API | Domain/DNS management. |
| Porkbun API | Domain/DNS management. |
| Enom API | Domain reseller/DNS. |
| OpenSRS API | Domain reseller/DNS. |
| WhoisXML API | WHOIS, domain age, DNS, reputation, ownership data. |
| SecurityTrails API | DNS history, subdomains, infrastructure intelligence. |
| DNSDB / Farsight | Passive DNS intelligence. |
| DomainTools API | Domain intelligence, WHOIS, risk. |
| MXToolbox API | DNS/MX/blacklist checks. |
| Google Postmaster Tools API | Domain reputation/deliverability monitoring for Gmail. |
| Microsoft Graph API | Outlook/Microsoft 365 mailbox, users, groups, mail, calendar. |
| Gmail API | Gmail mailbox/send/read workflows. |
| Mailgun API | Sending, validation, events. |
| SendGrid API | Sending/events. |
| Postmark API | Transactional email. |
| SparkPost API | Sending and deliverability data. |
15. Ecommerce / Marketplace APIs
Useful if you target ecommerce brands, sellers, retailers, distributors, manufacturers, or resellers.
| API | Use case |
|---|---|
| Amazon Product Advertising API | Product/catalog data, affiliate/ecommerce research. |
| Amazon Selling Partner API | Seller/order/product workflows if authorized. |
| Keepa API | Amazon price/rank history. |
| Rainforest API | Amazon product/search/review data. |
| ScrapingBee Marketplace Scraper | Product data, prices, reviews, rankings from Amazon, eBay, Costco, Walmart, Etsy, etc. |
| Bright Data Ecommerce APIs | Product/pricing/review data. |
| DataForSEO Merchant APIs | Google Shopping/product SERP data. |
| SerpApi Shopping APIs | Google Shopping and product result data. |
| Shopify API | Storefront/admin data if authorized. |
| WooCommerce API | Store/order/product data if authorized. |
| BigCommerce API | Store/product/order data if authorized. |
| Etsy API | Marketplace/listing/shop data. |
| eBay API | Listings, pricing, marketplace data. |
| Walmart Marketplace API | Seller/product data if authorized. |
| Best Buy API | Product/catalog data. |
| Target APIs / unofficial providers | Product/pricing availability, depending on provider. |
16. Review / Reputation APIs
Useful for local business, SaaS, ecommerce, hospitality, and service campaigns.
| API | Use case |
|---|---|
| DataForSEO Business Data API | Google reviews, business info, hotels, Tripadvisor, Trustpilot, Reddit/Pinterest data depending on endpoint. |
| SerpApi Reviews / Local APIs | Local reviews/search results. |
| Outscraper Reviews API | Google reviews and local reviews. |
| Trustpilot API | Business/review data depending on access. |
| G2 API / marketplace data | Software reviews/intent. |
| Capterra/GetApp-style data providers | Software category/review intelligence. |
| Yelp Fusion API | Local business/review data. |
| Tripadvisor content/data providers | Hospitality/travel review intelligence. |
| Google Business Profile API | Manage/retrieve owned business profile data. |
| ReviewTrackers API | Reputation management data. |
| Birdeye API | Reviews/reputation workflows. |
| Podium API | Reviews/messaging workflows. |
17. Ads / Paid Media Intelligence APIs
Good for finding companies spending money or running campaigns.
| API | Use case |
|---|---|
| Meta Ad Library API | See active/political/social issue ads and public ad library data. |
| Google Ads API | Campaign data for authorized accounts. |
| Google Ads Transparency Center data/tools | Competitor ad visibility, depending on access. |
| Semrush API | Paid search/SEO competitor intelligence. |
| SpyFu API | PPC keywords and competitor ads. |
| Similarweb API | Traffic sources and competitor intelligence. |
| Pathmatics / Sensor Tower | Ad intelligence, mobile/app/creative data. |
| Adbeat API | Display/native ad intelligence. |
| WhatRunsWhere | Ad intelligence. |
| BuiltWith / Wappalyzer | Identify ad pixels, analytics, retargeting tools. |
18. News / Funding / Event APIs
Use these for trigger-based outreach.
| API | Use case |
|---|---|
| PredictLeads News Events API | Company events and buying signals. |
| Crunchbase API | Funding, acquisitions, company data. |
| Dealroom API | Startup/funding data. |
| Tracxn API | Startup/company/funding intelligence. |
| NewsAPI | News monitoring. |
| GDELT API | Global news/event data. |
| Bing/Brave/Serp APIs | Search-based news discovery. |
| Event Registry API | News/event intelligence. |
| AlphaSense API | Market/company research, enterprise. |
| Factiva / Dow Jones APIs | Enterprise news/data. |
| SEC EDGAR API | Public company filings. |
| OpenCorporates API | Corporate registry data. |
| Companies House API | UK company registry. |
| Clearbit Company API | Company profile enrichment. |
19. Financial / Company Registry / Firmographic APIs
Useful for capital markets, commercial finance, M&A, and debt outreach.
| API | Use case |
|---|---|
| OpenCorporates API | Global company registry data. |
| Companies House API | UK company data. |
| SEC EDGAR API | US public company filings. |
| Nasdaq Data Link | Financial/economic datasets. |
| Alpha Vantage API | Market/financial data. |
| Financial Modeling Prep API | Public company financials. |
| IEX Cloud | Market data. |
| Polygon.io | Market data. |
| Intrinio | Financial data. |
| FactSet API | Enterprise financial data. |
| S&P Capital IQ API | Enterprise company/financial data. |
| PitchBook API | Private market/company/funding data. |
| Crunchbase API | Funding/private company data. |
| Dealroom / Tracxn | Startup/private company data. |
| Coresignal Company API | Firmographics/company datasets. |
| People Data Labs Company API | Company profile enrichment. |
| Dun & Bradstreet API | Business identity, firmographics, credit data. |
Practical "Search These First" List
For your actual use case, I'd start mining these marketplaces first:
- 1RapidAPI — broadest random API marketplace.
- 2Apify Store — best scraper marketplace.
- 3API.market — newer AI/API marketplace with non-B2B categories.
- 4ApyHub — utility + AI + web parsing APIs.
- 5APILayer — stable utility APIs.
- 6Zyla API Hub — cheap broad API marketplace.
- 7Postman API Network — discover official APIs and public workspaces.
- 8AWS Data Exchange — enterprise data/API products.
- 9Snowflake Marketplace — data products if you're building warehouse-native systems.
- 10Datarade — data vendor discovery.
- 11Make Marketplace — workflow/API modules.
- 12n8n integrations/templates — API workflows.
- 13Clay integrations — GTM enrichment/data provider discovery.
- 14Pipedream — developer workflow/API marketplace.
- 15Bright Data — scraping/data marketplace.
Best Categories to Search Inside Those Marketplaces
Use searches like:
| Search term | What you'll find |
|---|---|
| Google Maps scraper API | Local business lead APIs |
| business directory scraper | Yelp, Yellow Pages, industry directory scrapers |
| SERP API | Search result APIs |
| Google Search API | Search/data APIs |
| email finder API | Email discovery |
| email verification API | Deliverability/list cleaning |
| phone validation API | Phone number validation |
| company enrichment API | Firmographic data |
| person enrichment API | Contact enrichment |
| LinkedIn profile API | LinkedIn-style profile enrichment/scraping |
| Sales Navigator scraper | SalesNav extraction tools |
| job posting API | Hiring-signal data |
| technographic API | BuiltWith/Wappalyzer-style tech data |
| website crawler API | Crawl company websites |
| domain lookup API | Domain metadata, WHOIS, DNS |
| review scraper API | Google/Yelp/Trustpilot reviews |
| ecommerce scraper API | Amazon, Shopify, Etsy, Walmart data |
| marketplace scraper API | Ecommerce/product marketplaces |
| social media scraper API | Reddit/X/TikTok/Instagram-style data |
| news API company events | Trigger/event-based outreach |
| funding API | Startup/funding signals |
| ad intelligence API | Paid ads/competitor signals |
| SEO API | Organic search/keyword signals |
| traffic API | Website traffic and growth signals |
Best Quick-Stack
For cold email, the strongest system is not one API.
It is:
- Marketplace/discovery layer: RapidAPI, Apify, API.market, ApyHub, Zyla
- Extraction layer: Apify, Firecrawl, ScrapingBee, DataForSEO, SerpApi
- Signal layer: PredictLeads, TheirStack, BuiltWith, Wappalyzer, Similarweb
- Enrichment layer: BlitzAPI, LeadMagic, People Data Labs, Apollo, Prospeo
- Verification layer: ZeroBounce, NeverBounce, Hunter, Abstract
- Workflow layer: n8n, Make, Clay, Pipedream
- CRM/sending layer: HubSpot, EmailBison, Instantly, Pipedrive, Attio
That gives you:
Find companies → detect signal → enrich people → verify emails → score fit → send campaign.
Need cold email volume?
Done-for-you mailboxes for outbound
InfraSuite is built for teams that rely on cold email as a core revenue channel and need stable, high-performing Outlook mailboxes. You subscribe to a proven Microsoft-based sending environment that's already configured for cold outreach — provisioning, DNS, mailbox setup, and deliverability hygiene handled for you. A completely hands-free and automated solution so you can focus on campaigns, clients, and revenue instead of infrastructure risk.
- Stable inbox placement across Outlook and Google
- Fewer resets, fewer domain swaps
- Capacity ready when clients sign
- Calm, competent support when something looks off