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"Gmail" matching MCP connectors:
GET /v1/connectors — MCP directory API referenceMatching Connector Tools:
Validates email syntax and MX records. x402 payment required (testnet USDC).
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.