>Mail a letter online in minutes | PostalForm | Postal Form

# PostalForm > PostalForm turns PDFs into mailed letters for U.S. addresses. Upload a PDF, enter sender and recipient addresses, and PostalForm prints and mails it via USPS. PostalForm supports developer integrations via a Model Context Protocol (MCP) server at /mcp for creating order drafts, launching checkout, and checking order status. Contact: support@postalform.com. ## Capabilities - Mail letters, forms, and multi-page packets as a single PDF - Print options: color and double-sided - Address validation and autocomplete to prevent returned mail - Works on mobile and desktop (upload from phone) - U.S. destination addresses ## Docs - [Developers (MCP API)](https://postalform.com/developers.md) - [Agents (Machine payments)](https://postalform.com/agents.md) ## Product - [Pricing](https://postalform.com/pricing.md) - [Delivery times](https://postalform.com/delivery-times.md) ## Forms - [Forms hub](https://postalform.com/forms.md) - [IRS forms](https://postalform.com/forms/irs.md) - [Medicare forms](https://postalform.com/forms/medicare.md) - [VA forms](https://postalform.com/forms/va.md) - [USCIS forms](https://postalform.com/forms/uscis.md) - [Social Security forms](https://postalform.com/forms/social-security.md) - [DMV forms](https://postalform.com/forms/dmv.md) - [Court forms](https://postalform.com/forms/courts.md) - [Annual Credit Report Request Form](https://postalform.com/forms/annual-credit-report-request.md) - [Card Billing Dispute Packets](https://postalform.com/forms/card-billing-dispute.md) - [CMS-1490S](https://postalform.com/forms/cms-1490s.md) - [CMS-20027 - Redetermination Request Form](https://postalform.com/forms/cms-20027.md) - [CMS-20031 - Transfer of Appeal Rights](https://postalform.com/forms/cms-20031.md) - [CMS-20033 - Medicare Reconsideration Request](https://postalform.com/forms/cms-20033.md) - [Form DS-64](https://postalform.com/forms/ds-64.md) - [Gym membership cancellation letter](https://postalform.com/forms/gym-membership-cancell

{"openapi":"3.1.0","info":{"title":"PostalForm Machine Payments API","version":"1.0.0","description":"Machine-oriented print-and-mail endpoints for legacy x402 and MPP payment flows.","guidance":"Use OpenAPI as the canonical discovery source for this origin. The fallback /.well-known/x402 document only lists the legacy x402 create endpoint.\n\nFor both machine payment families, call the validate endpoint first to verify the payload and get a quote before attempting payment.\n\nWhen retrying a cr