Email API 5

SaaS boilerplate with NextJS, Supabase, and Stripe integration for rapid SaaS development. SupaLaunch is a SaaS boilerplate based on NextJS and Supabase. It supports Stripe payments (one-time and subscriptions), database, authentication, storage, OpenAI APIs connection, design elements, landing page template, and email APIs. It's designed for vibe-coding SaaS applications with Cursor integration.

Unified API for LinkedIn, WhatsApp, email, and B2B data automation LinkupAPI is a unified B2B API platform that gives AI agents and business applications access to LinkedIn engagement, WhatsApp messaging, real-time web crawling, professional email discovery, contact enrichment, company data, and buying signals. It provides more than 50 endpoints for activities such as sending LinkedIn messages, managing invitations, interacting with posts, finding and verifying emails, extracting company information, monitoring job postings, and identifying real-time intent signals. The platform is designed for sales, recruitment, CRM enrichment, no-code automation, and AI-agent workflows.

Reliable transactional and marketing email platform for developers, marketers, and AI agents. AutoSend is a lightweight email platform offering reliable transactional and marketing email services for developers, marketers, and AI agents. It serves as an alternative to platforms like SendGrid, focusing on simple APIs (REST, SDKs), robust deliverability (98.97%), and transparent volume-based pricing that avoids charging users based on the size of their contact list. It includes features like quick setup, easy migration tools, real-time activity logs, intelligent contact suppression, and dedicated tools for marketing campaigns and automation.

All-in-one platform for email marketing, automation, CRM, and customer engagement Brevo is an all-in-one customer engagement platform for email and SMS marketing, CRM, automation, transactional messaging, sales management, live chat, loyalty programs, and customer data management. It helps businesses create campaigns, manage contacts, automate customer journeys, send transactional messages, track performance, and engage customers across email, SMS, WhatsApp, push notifications, chat, and other channels.

Sendmux is an email inbox API for AI agents. It gives agents dedicated mailboxes, multi-provider sending, live inbox events, and developer tools so they can send, receive, route, and react to email in production. Sendmux helps developers give AI agents a real email identity. Instead of stitching together a sending API, mailbox provider, parser, webhook layer, and billing system, teams can use one platform for inbound mailboxes, outbound sending, routing, quotas, webhooks, and live inbox events. Agents can receive email in dedicated mailboxes, read messages and threads, process attachments, send replies, and stream inbox activity through Server-Sent Events. Outbound sending supports SMTP, Gmail OAuth, Outlook OAuth, and Sendmux-managed Amazon SES, with delivery groups, weighted routing, per-provider quotas, health checks, and failover. Sendmux is built for AI agent teams, automation agencies, SaaS platforms, and developers building support agents, sales agents, scheduling agents, monitoring agents, and workflow agents. It also includes REST APIs, OpenAPI specs, SDKs, CLI, MCP tools, and Sendmux Skills.