Service Directory

api.resend.com

Resend provides a REST API for programmatic access to its features. Use it to automate workflows and integrate with other services.

api.postmarkapp.com

Postmark is a transactional email API focused on reliable, fast delivery. It is designed specifically for application-generated emails like password resets, welcome emails, and notifications. Postmark provides detailed delivery stats, bounce tracking, template management, and message search with industry-leading delivery speeds.

api.pandadoc.com

PandaDoc is a document automation platform for creating, sending, tracking, and e-signing proposals, contracts, and quotes. It provides a REST API for programmatic document lifecycle management including template-based generation, recipient management, and legally-binding electronic signatures.

api.paddle.com

Paddle is a complete SaaS billing platform that acts as a merchant of record, handling payments, tax compliance, and subscription management globally. It lets you create products, define pricing, manage subscriptions, and track transactions without worrying about sales tax or VAT collection.

api.onesignal.com

OneSignal is a customer engagement platform for push notifications, email, SMS, and in-app messaging. Use this API to send notifications across channels, manage users and segments, and track message delivery and engagement.

api.mailgun.com

Mailgun is a powerful email sending and receiving API built for developers. It handles transactional and bulk email delivery with high deliverability, real-time event tracking, and email validation. Use it to send emails, validate addresses, track delivery events, manage mailing lists, and monitor bounces.

api.lemlist.com

Lemlist is a sales engagement and outreach automation platform. Use it to manage cold email campaigns, add and track leads through sequences, enrich contact data, send multi-channel messages (email, LinkedIn, WhatsApp), and monitor campaign performance with detailed analytics.

api.hubapi.com

HubSpot is an all-in-one CRM platform for marketing, sales, and customer service. Manage contacts, companies, deals, tickets, and automate workflows through a comprehensive REST API.

api.helpscout.net

Help Scout is a customer support platform built around shared email inboxes. The Mailbox API lets you manage conversations, customers, mailboxes, and teams. It is designed for support teams that want an email-like experience with collaboration features, saved replies, and customer profiles.

api.bigcommerce.com

BigCommerce is an enterprise e-commerce platform providing REST APIs to manage online stores. Agents can programmatically manage products, orders, customers, carts, and categories across BigCommerce storefronts.

api.beehiiv.com

Beehiiv is a newsletter platform built for growth. Use it to manage subscribers, create and publish posts, segment your audience, track analytics, and run referral programs. It supports bulk operations and automation journeys.

3.basecampapi.com

Basecamp is a project management and team collaboration platform. Use this API to create and manage projects, todolists, todos, messages, and coordinate with team members in a centralized workspace.

api.gumroad.com

Creator commerce platform for selling digital products, memberships, and subscriptions. Manage products, track sales analytics, verify software licenses, and handle subscriber relationships.

harvest.greenhouse.io

Greenhouse is an applicant tracking system (ATS) for managing recruiting and hiring workflows. Use the Harvest API to list and search candidates, manage job postings, track applications through hiring stages, add new candidates, and view scheduled interviews. Authentication uses Basic auth where the API key is the username with an empty password (base64 encode 'apikey:').

api.gocardless.com

GoCardless is a global direct debit payment platform that lets you collect recurring and one-off payments directly from customer bank accounts. It supports SEPA Direct Debit, Bacs, ACH, BECS, and other local bank debit schemes across 30+ countries, with lower fees than card payments and reduced churn from failed payments.

api.fusionauth.io

FusionAuth is a self-hostable identity and access management platform. It provides APIs for user registration, login, JWT management, multi-factor authentication, application configuration, and tenant management for multi-tenant deployments.

api2.frontapp.com

Front is a collaborative inbox platform that unifies email, SMS, chat, and social messages into shared team inboxes. Use it to manage conversations, assign teammates, tag threads, and maintain a centralized contact database.

domain.freshsales.io

Freshsales is a CRM by Freshworks for sales teams. Manage contacts, accounts, deals, and sales activities with AI-powered lead scoring, built-in phone, and email tracking.

api.freshbooks.com

FreshBooks is a cloud-based accounting and invoicing platform for freelancers and small businesses. The API lets you manage clients, create and send invoices, track expenses, log time entries, and handle payments programmatically.

identitytoolkit.googleapis.com

Firebase Authentication REST API for managing user identity. Sign up and sign in users with email/password, send password reset and email verification messages, exchange refresh tokens, and manage user accounts. Uses Google Identity Toolkit under the hood.