"How to send an email through the end-user's Outlook" matching MCP servers:

Enables sending transactional emails with text or HTML body, delivery status, and message ID via Resend. Pay-per-call using x402 micropayments (USDC on Base L2), no API key or signup required.

Enables AI agents to spend with the user's own key by paying via USDT TRC-20 and buying Visa/Mastercard prepaid cards, travel eSIMs, and gift cards, and also provides access to policy and how-to documentation.

A minimal demo of the x402 payment protocol protecting an MCP tool endpoint, showing how to charge for MCP tools using real 402 rejections and testnet payments.

An MCP server that enables commerce operations specialists to resolve delayed, lost, or disputed deliveries and make refund decisions end-to-end, with built-in safety controls and carrier verification.

A paid MCP server that lets AI agents send SMS messages to US phone numbers via x402 micropayments, with automatic compliance and opt-out handling.

Trust infrastructure for the machine economy. Gives AI agents non-custodial smart accounts (ERC-4337), x402 payments, on-chain reputation via ERC-8004 trust registry, and service discovery. 8 tools: create accounts, transfer, check balances, pay for x402 services, publish/discover services, manage payment agreements, and send encrypted messages.

MCP server for the HAUL API marketplace, enabling email and phone verification, credit balance checks, and top-ups.

AI-powered invoice automation. Create PDF invoices, predict late payment risk 0-100, auto-send reminders, reconcile Stripe/PayPal payments, track cash flow. 10 MCP tools, 4 resources.

An MCP server that enables AI agents to manage merchant payment processing through the BTCPay Server Greenfield REST API. It supports tools for creating invoices, managing stores, tracking payments, and performing Lightning Network operations.

Enables interaction with the Yugo Payments API to manage payins, payouts, and accounts through auto-generated MCP tools.

An MCP server for KG Financial's payment services integration, enabling AI coding tools to generate accurate code by automatically searching payment integration documentation through natural language queries.

Enables AI assistants to parse, validate, send, and inspect X12 EDI documents via the SignalEDI Core API, with optional QuickBooks integration and a demo mode for keyless local testing.

Enables AI assistants to search real products, purchase with user approval, track deliveries, and run a seller business end to end via the Firestarter commerce platform.

Enables AI agents to resolve social handles to wallet addresses, check reputation scores, and send tokens directly from any MCP-compatible client.

MCP server for managing domains, DNS records, email mailboxes, and billing on the adm.tools hosting platform via API.

Enables AI agents to manage financial operations including balance checks, money transfers, invoicing, spending policies, and audit logs through the PayGent API.

MCP server that enables AI agents to operate WhatsApp via Visto Azul API: send text, media, PIX charges, manage campaigns and contacts, and configure webhooks using natural language.

An MCP server for the Billingo invoicing API (v3) that enables AI assistants like Claude to manage invoices, partners, products, expenses, and more through natural language.

Enables end-to-end ride-booking workflows, including pickup and destination selection, ride estimates, solo or ShareMatch shared rides, driver tracking with live ETAs, trip management, payments, receipts, saved places, and safety/support tools.

An MCP server that enables AI agents to accept Bitcoin Lightning payments. It allows agents to create orders, generate invoices, check payment status, and manage the full SatsRail merchant API through natural language.