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"Gmail" matching MCP connectors:
GET /v1/connectors – MCP directory API referenceMatching Connector Tools:
Print and mail real letters through USPS. Write, preview the exact printed proof, then pay or send.
Validates email syntax and MX records. x402 payment required (Base mainnet USDC).
x402 v2 payment requests; relays compatible clients' signed payments to the existing product API.
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.