Postbye

com.postbyePublished by postbye.comOfficial publisherv1.2.0Updated Oct 29, 2026

Cancel subscriptions: real cancellation letters & addresses for 10,000+ companies.

VerifiedStreamable HTTPWeb executableProductivity & WorkflowBusiness & Commerce

Overview

AI-generated overview

Read-only reference that lets an assistant look up how to cancel subscriptions and memberships at 10,000+ companies and draft a cancellation letter.

What you can do
  • Search companies by name and get their slug, category and how they take cancellations
  • Read a company's cancellation guide: notice period, traps, billing-partner notes, sources, verification date and mailing addresses
  • Generate a plain-text cancellation letter with where to send it, leaving unsupplied fields as bracketed placeholders
  • List the guide category hubs, such as streaming, gyms, phone and internet, with guide counts
When to use it
Useful when someone wants to cancel a subscription or membership, especially by mail, and needs the company's cancellation route, notice period, pitfalls and mailing address, or a ready-to-send letter draft.
Requirements
A remote MCP endpoint at postbye.com over streamable HTTP; no packages, environment variables or headers are declared.
Before you install
Read-only reference: it does not cancel anything itself, and letters are drafts with placeholders to complete. Facts are tied to the company's page on postbye.com and carry a verification date, so confirm details before sending mail.

Installation

In SourceWeft

  1. Open Postbye in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/com.postbye%2Fpostbye/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config.

{
  "mcpServers": {
    "postbye": {
      "type": "http",
      "url": "https://postbye.com/mcp"
    }
  }
}

Tools

4

search_companies

Search cancellation guides

Find companies by name (for example "netflix" or "planet fitness") among the subscriptions and memberships Postbye has a cancellation guide for. Returns each match's slug, category, how the company takes cancellations and the guide URL. Use the slug with get_cancellation_guide.

Parameterslimitqueryrequired

get_cancellation_guide

Get a cancellation guide

How to cancel one company's subscription or membership: how it takes cancellations, the notice period, the traps to check first, billing-partner notes, sources, when the facts were verified, the mailing address(es) on file and the guide and address page URLs. Accepts a company slug from search_companies (merged duplicate slugs resolve to the current one).

Parametersslugrequired

get_cancellation_letter

Get a cancellation letter

A plain-text cancellation letter for one company, built from the same template as Postbye's free letter tool, plus where to send it. Fields not supplied stay as [bracketed placeholders] to fill in. Nothing is stored.

Parametersslugrequiredcustomer_nameaccount_number

list_categories

List guide categories

The category hubs of the cancellation guides (streaming, gyms, phone and internet, insurance and more) with the number of guides in each and the hub URL.

Takes no parameters.

Version history

1
  1. v1.2.0LatestOct 29, 2026

Score

83% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 daysRequired25 pts
  • Auth declaredRequired10 pts
  • Tools listedRequired15 pts
  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts

    Declare a GitHub repository with a README, or serve resource_documentation in the OAuth protected-resource metadata.

  • LicenseNot applicable

    A hosted service is used under its provider's terms, so no license is expected here. This check is left out of the percentage.