Cold Email APIs for AI Agents
Your AI agent can now run full outbound campaigns. These APIs let you send emails, manage sequences, handle warmup, and track engagement — all programmatically.
| Tool | API | Auth | SDKs | Webhooks | Free Tier | MCP |
|---|---|---|---|---|---|---|
| Reply.io AI sales outreach & cold email platform with multichannel sequences. | REST | API KeyOAuth2 | Node.jsPython | |||
| LeadGenGPT Open-source AI tool for automating cold email outreach and lead generation. | TypeScript | |||||
| coldr Run, preview, and ship cold email campaigns straight from your terminal. | — | |||||
| First Sales Cold email platform with automated warmup and inbox placement. | REST | API Key | — | |||
| FlowUp Automated multichannel lead follow-up and sales automation. | REST | API Key | — | |||
| Folderly AI-powered email deliverability and warmup API. | REST | API Key | — | |||
| GetResponse Marketing automation and email marketing platform with a full API. | REST | API KeyOAuth2 | — | |||
| GetSales.io Public API for automating LinkedIn outreach and contact management. | REST | API Key | — | |||
| Inframail Scalable cold email infrastructure with automated setup. | REST | API Key | — | |||
| Klenty Sales engagement platform for multi-channel outbound and personalized outreach. | REST | API Key | — | |||
| Mailreef Programmatic email infrastructure for expert cold emailers. | REST | API Key | — | |||
| Manyreach Cold email outreach platform with unlimited email accounts. | REST | API Key | — | |||
| Salesflow Social and email outreach automation for lead generation. | REST | API Key | — | |||
| Mailtrack Email tracking for Gmail with real-time notifications. | REST | API Key | Node.jsPython | |||
| Genesy AI-powered lead generation and sales automation platform. | REST | API Key | — | |||
| La Growth Machine Multi-channel sales automation platform for high-engagement outbound. | REST | API Key | — | |||
| Landbase AI-driven GTM platform for prospecting and lead generation. | REST | API Key | — | |||
| Lightfield AI sales assistant for personalized outreach and high-engagement lead gen. | REST | API Key | — | |||
| Octave AI-powered sales platform for personalized prospecting and lead gen. | REST | API Key | — | |||
| Outplay Multi-channel sales engagement platform for high-performance outreach. | REST | API Key | — | |||
| Overloop Multi-channel sales automation platform for email and LinkedIn outreach. | REST | API Key | — | |||
| Primerole AI sales assistant for personalized outreach and engagement. | REST | API Key | — | |||
| Prosp AI sales assistant for personalized prospecting and LinkedIn outreach. | REST | API Key | — | |||
| Salesmotion AI sales platform for automated prospecting and outbound outreach. | REST | API Key | — | |||
| Success.ai Cold email outreach and lead enrichment platform for sales teams. | REST | API Key | — | |||
| Typewise AI-powered writing assistant for sales and support communication. | REST | API Key | — | |||
| Verse AI-powered lead conversion and engagement platform. | REST | API Key | — | |||
| AimFox Built for LinkedIn outreach and automated relationship management. | REST | API Key | — | |||
| Amplemarket AI Sales Copilot that boosts opportunity rates with intent signals and research. | REST | API Key | — | |||
| Autobound AI writing assistant for personalized sales outreach and follow-ups. | REST | API Key | — | |||
| Clado AI sales assistant for personalized outreach and lead generation. | REST | API Key | — | |||
| Cliengo AI chatbot for automated lead capture and customer conversion. | REST | API Key | — | |||
| Conversica AI revenue assistants for automating lead engagement and follow-up. | REST | API Key | — | |||
| Crono AI-powered sales engagement and workflow automation for revenue teams. | REST | API Key | — | |||
| Drift Conversational marketing and sales platform powered by AI. | REST | OAuth2 | Node.js | |||
| Extrovert AI-driven LinkedIn automation for personalized outreach and lead gen. | REST | API Key | — | |||
| FirstTouch AI-driven sales outreach and prospecting for personalized lead gen. | REST | API Key | — | |||
| GMass Powerful mail merge and cold email system for Gmail. | REST | API Key | — | |||
| Groove Sales productivity and engagement platform for Salesforce-native teams. | REST | OAuth2 | — | |||
| Intercom AI-powered customer service and sales platform for real-time engagement. | REST | OAuth2 | PythonNode.jsRuby | |||
| Loops Email platform for modern SaaS companies. | REST | API Key | Node.js | |||
| Meet Alfred Multi-channel sales automation for LinkedIn, Email, and Twitter. | REST | API Key | — | |||
| Mixmax Sales engagement platform for Gmail and Outlook to drive outbound productivity. | REST | API Key | JavaScript | |||
| Penny AI sales assistant for direct sales and social commerce. | REST | API Key | — | |||
| SalesBlink Full-stack cold outreach automation platform for sales teams. | REST | API Key | — | |||
| Salescaptain AI-powered sales engagement and lead generation platform. | REST | API Key | — | |||
| Saleshandy Cold email outreach platform with automated follow-ups and high deliverability. | REST | API Key | — | MCP | ||
| Salesloft AI-powered revenue orchestration platform for high-performance sales teams. | REST | OAuth2 | Node.jsRubyPython | |||
| Salesrobot LinkedIn automation platform for personalized outbound outreach. | REST | API Key | — | MCP | ||
| Scout AI-powered B2B prospecting and email personalization platform. | REST | API Key | — | |||
| Smartlead Scale outreach with unlimited mailboxes and AI-powered deliverability. | REST | API Key | — | |||
| Snov.io All-in-one platform for lead generation, email verification, and outreach. | REST | API Key | Node.jsPythonPHP | |||
| Spotio Field sales engagement platform for territory management and lead tracking. | REST | API Key | — | |||
| Warmbox Email warmup tool to ensure cold emails never land in spam. | REST | API Key | — | |||
| WooSender AI-powered lead conversion and appointment booking platform. | REST | API Key | — | |||
| Woodpecker Cold email outreach and follow-up automation for sales and agencies. | REST | API Key | — | |||
| Zeliq All-in-one sales prospecting platform with massive contact database. | REST | API Key | — | MCP | ||
| Mailshake Cold email outreach platform used by 38,000+ sales professionals. | REST | API Key | Node.jsPython | |||
| Lemlist Sales engagement platform with advanced personalization and outreach APIs. | REST | API Key | Node.jsPython | |||
| Inbox The unified API and MCP server for managing X (Twitter) DMs. | REST | Bearer Token | — | |||
| Instantly.ai The gold standard for cold email infrastructure and automation. | REST | API Key | — | MCP | ||
| Resend Modern email API built for developers. | REST | API Key | — | MCP |