"Gmail - Google's Email Service" matching MCP connectors:

Trust layer for the x402 economy - check any service before you pay. Scores, discovery, routing.

Pay-per-call x402 gateway: agent tools, OpenAI-compatible LLM, market data, RPC, security audits.

Tollbooth Authority — Certified Purchase Order Service for DPYC operators

Search travel eSIM plans for 150+ countries and buy via Stripe link; eSIM QR delivered by email.

Time tracking, live project budgets, and billing exports for service firms.

Workflow diagnostics, capability routing, and x402 settlement for MCP-compatible agents.

AI news, model pricing, service status, and machine-payable premium tools. AFTA-certified.

CardGuard is a high-performance MCP-compliant service designed for real-time transaction fraud detection and IP threat intelligence. It provides microsecond-level scoring and multi-dimensional analysis (IP geolocation, BIN validation, and risk pattern recognition) for autonomous AI agents

Print and mail physical letters and postcards to US postal addresses, plus address verification. Upload PDF/HTML/Markdown/text/DOCX/image documents, get a quote, and pay per call with x402 USDC on Base mainnet or credit card. Supports certified/registered mail with proof of delivery and mail-merge templates.

Issue and manage Brazilian service invoices (NFS-e) by chatting with your agent, platform-hosted, no

AI service marketplace — agents discover, call, and pay for API services automatically.

78 agent APIs with x402 micropayments on Base. USDC settlement.

Brazil NFS-e service invoices for AI agents via Focus NFe and NFe.io. Stateless, never stores data.