Agent-ready email and messaging
129 verified email and messaging sites, 69 of them transactable — every one probed live, with the date it was checked. Figures generated 27 Sep 2026 13:51 UTC
Checks passed across the 140 probed hosts: Markdown negotiation 122 · Markdown twin at a predictable URL 91 · llms.txt 128 · API catalog 36 · MCP server card answers 94.
✓Seconds seconds.me
Seconds offers pay-per-second video calls with creators, charging only for connected time without subscriptions or scheduling.
✓ssaprus.works ssaprus.works
Whisper OS enables flashing firmware and off-grid messaging on supported mesh radio devices without internet.
✓Bandwidth www.bandwidth.com
Bandwidth provides an enterprise communications platform offering voice, messaging, and emergency APIs with global SIP trunking and direct-to-carrier integrations.
✓Mailrith mailrith.com
Mailrith is a fixed-price email marketing automation platform allowing customers to connect their own email delivery services and manage unlimited subscribers.
also in marketing software✓Sequenzy www.sequenzy.com
Sequenzy is an email marketing tool for SaaS that enables sending onboarding sequences, trial emails, and transactional messages with AI-powered setup and segmentation.
also in marketing software✓Customer.io Docs docs.customer.io +1 more host on this domain
Documentation for Customer.io messaging automation platform covering setup, integration, messaging, segmentation, analytics, and API reference.
also in workflow automation software✓Dreamlit AI dreamlit.ai
Dreamlit AI is an AI email marketing platform that creates transactional, lifecycle, and marketing email workflows connected directly to your database.
also in marketing software✓Synology Camera License 24x7 synopower.club
SynoPower Club sells official Synology Surveillance Station licenses with instant 24x7 digital key delivery by email.
also in developer platforms✓Does My Email Work doesmyemail.work
Free tool to scan domain email authentication including SPF, DKIM, DMARC, and mail server configuration with results in 30 seconds and no signup required.
also in security and identity✓Phone-Check.app phone-check.app
Phone-Check.app provides a phone validation API for real-time carrier detection, fraud checks, and bulk list hygiene.
also in programming languages and frameworks✓Mailcoach www.mailcoach.app
Mailcoach is an email marketing platform for sending newsletters, drip campaigns, and transactional emails with automation and API integration.
also in marketing software✓AgentSIM agentsim.dev
AgentSIM provides a control plane for authorized testing of SMS OTP workflows using programmable US test numbers via SDKs and APIs.
also in SDKs and API clients✓Amplemarket API docs.amplemarket.com
Documentation for Amplemarket API including guides, API reference, webhooks, and support resources.
also in SDKs and API clients✓Apten docs.apten.ai
Apten provides API documentation for a customizable AI SMS and voice agent that automates sales and marketing by qualifying and nurturing leads.
also in marketing software✓AutoSend Documentation docs.autosend.com
AutoSend is an email platform for developers and marketers to send transactional and marketing emails, receive inbound emails via API, and integrate with AI agents.
also in AI agents✓ContactSwing Docs docs.contactswing.ai
Documentation for ContactSwing's AI-powered communication platform covering AI agents, integrations, workflows, and API reference.
also in AI agents✓DMARCeye Docs docs.dmarceye.com
DMARCeye Docs explains how to set up, monitor, and manage DMARC reports and domain email authentication.
also in analytics and observability✓Feather docs.featherhq.com
Feather provides documentation for an AI conversation platform supporting voice calls, SMS, email, web chat, routing, scheduling, and workflow automation.
also in workflow automation software✓ManyPI Docs docs.manypi.com
ManyPI Docs provides documentation for an AI sales platform that finds leads, verifies emails, and manages outreach via API and dashboard.
also in AI agents✓Minimo Docs docs.minimo.it
Minimo Docs provides documentation for a messaging platform that sends email, WhatsApp, and SMS triggered by your own database with AI integration.
also in databases and storage✓Nedzo docs.nedzo.ai
Nedzo provides documentation for building, deploying, and refining AI customer engagement agents across multiple communication channels.
also in customer support software✓Penbox Documentation docs.penbox.io
Penbox is a case intelligence platform managing operational cases end-to-end with AI-driven workflows and API configurability.
also in AI agents✓Prelude Docs docs.prelude.so
Prelude provides authentication infrastructure with APIs for user verification, fraud prevention, and authentication management globally.
also in security and identity✓Starleads api docs docs.starleads.co
Documentation for Starleads conversational AI platform API managing campaigns, prospects, and real-time results.
also in conversational and voice AI✓Surge docs.surge.app
Surge is an SMS and voice API for developers offering fast carrier registration, JSON-based REST API, voice integrations, embeddable UI, and SDKs.
also in conversational and voice AIMore in Developer APIs & infrastructure: payments · e-signatures · AI agents · conversational and voice AI · generative media · blockchain and web3 · search and data APIs · analytics and observability · databases and storage · cloud and hosting · security and identity · extensions and plugins · embedded devices and firmware · programming languages and frameworks · build and test tooling · SDKs and API clients · developer platforms · ecommerce infrastructure