MailerCheck MCP by usefulapi

io.usefulapiPublished by usefulapi.ioOfficial publisherv1.7.4Updated Nov 7, 2026

Check MailerCheck credits and lists, and run confirmed asynchronous email verification.

The publisher's own server: Ably MCP by usefulapi

VerifiedStreamable HTTPWeb executableCommunication & CollaborationBusiness & Commerce

Overview

AI-generated overview

Hosted MailerCheck connector that lets an assistant check verification credits and lists and run confirmed, asynchronous email verification.

What you can do
  • Read account details and the remaining MailerCheck verification credit balance
  • Browse verification lists and read one list's status and aggregate result counts
  • Submit a single email for asynchronous verification and later read its result
  • Check monthly tool-call usage, request a missing feature, and manage the Pro subscription
When to use it
Useful when you want an assistant to check email deliverability data in MailerCheck, review list verification status, or verify individual addresses while keeping an eye on credit spend.
Requirements
Remote MCP endpoint added by URL only; no API key or Authorization header in the client config. Sign-in is OAuth through a hosted page that asks for your MailerCheck credentials. A MailerCheck account is required; the free plan allows 50 tool calls per month.
Before you install
Verification spends MailerCheck credits and requires confirm:true; a lost response should be checked in MailerCheck before resubmitting, since the call is never retried. Meta tools can start a paid Stripe Checkout subscription (Pro or Pro+) or cancel it, with no refund for the current period. Your MailerCheck credentials are entered on the hosted sign-in page.

Installation

In SourceWeft

  1. Open MailerCheck MCP by usefulapi 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/io.usefulapi%2Fmailercheck/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": {
    "mailercheck-by-usefulapi": {
      "type": "http",
      "url": "https://mailercheck.usefulapi.io/mcp"
    }
  }
}

README

MailerCheck MCP by usefulapi

https://mailercheck.usefulapi.io/mcp

Connect

  • Claude (claude.ai, Desktop): open Customize → Connectors, click + Add → Add custom connector, and paste https://mailercheck.usefulapi.io/mcp.
  • Claude Code: claude mcp add --transport http mailercheck https://mailercheck.usefulapi.io/mcp, then run /mcp to log in.
  • VS Code: Add to VS Code.
  • Cursor and other clients: add the URL as a remote MCP server:
json
{  "mcpServers": {    "mailercheck": {      "url": "https://mailercheck.usefulapi.io/mcp"    }  }}

Add only the URL. Do not add an Authorization header or an API key to the client config: the server signs you in with OAuth, and the login page asks for your MailerCheck credentials.

Step-by-step setup, where to find your credentials, and FAQ: https://usefulapi.io/mailercheck/

Connect your own MailerCheck credentials through the hosted sign-in page.

Tools

ToolTypeWhat it does
mailercheck_accountreadRead MailerCheck account
mailercheck_creditsreadCheck MailerCheck credits
mailercheck_listsreadList MailerCheck verification lists
mailercheck_get_listreadRead MailerCheck list status
mailercheck_verify_emailwriteStart MailerCheck email verification
mailercheck_verification_resultreadRead MailerCheck email verification result
mailercheck_usage_statusmetaUsage status (free-tier meter)
mailercheck_request_featuremetaRequest a missing feature
mailercheck_upgrademetaUpgrade to Pro or Pro+
mailercheck_cancel_subscriptionmetaCancel the Pro subscription

read tools are read-only; write tools mutate data (clients should confirm them); meta tools report usage, manage your subscription or send a feature request.

Pricing

PlanPriceLimit
Free$050 tool calls / month
Pro (per user)$9/mo or $90/yr (2 months free)Unlimited*

*Pro has a fair use limit of 10,000 tool calls a month on this server. For more, write to [email protected].

Pro covers this server only. Subscribe with mailercheck_upgrade (it returns a Stripe Checkout link). Cancel any time with mailercheck_cancel_subscription: Pro continues to the end of the paid period, with no refund for the current period, and running mailercheck_upgrade before then undoes the cancel. Or write to [email protected].

License

MIT

Source: servers/mailercheck/README.md at commit 4046075

Tools

6

mailercheck_account

Read MailerCheck account

Read the connected MailerCheck account name, ID and credit balance. Does not verify emails or spend verification credits.

Takes no parameters.

mailercheck_credits

Check MailerCheck credits

Read the available MailerCheck verification credit balance without starting verification.

Takes no parameters.

mailercheck_lists

List MailerCheck verification lists

Read one bounded page of list summaries, processing status and statistics. Does not create, verify or delete lists. Pagination stays on the MailerCheck API; no response links are followed.

Parameterspagelimit

mailercheck_get_list

Read MailerCheck list status

Read one existing list's verification status and aggregate result counts. Does not start or restart verification.

Parameterslist_idrequired

mailercheck_verify_email

Start MailerCheck email verification

Submit one email for asynchronous verification. Spends MailerCheck credits and requires confirm:true. This call is never retried. Read the returned verification ID with mailercheck_verification_result; wait between polls. If the response is lost, check MailerCheck before submitting again.

Parametersemailrequiredconfirm

mailercheck_verification_result

Read MailerCheck email verification result

Read the status and result of a previously submitted asynchronous email check. Does not start new verification. Call once and wait before polling again; no automatic polling is performed.

Parametersverification_idrequired

Version history

11
  1. v1.7.4LatestNov 7, 2026
  2. v1.6.3Nov 5, 2026
  3. v1.6.2Nov 5, 2026
  4. v1.6.1Nov 4, 2026
  5. v1.6.0Nov 3, 2026
  6. v1.5.1Nov 3, 2026
  7. v1.4.0Nov 1, 2026
  8. v1.2.0Oct 31, 2026
  9. v1.1.0Oct 31, 2026
  10. v1.0.3Oct 30, 2026
  11. v1.0.1Oct 30, 2026

Score

100% 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
  • License10 pts

Other Usefulapi integrations

Ably MCP by usefulapi

io.usefulapiOfficial publisher

Hosted MCP server for Ably realtime messaging: inspect channel history, presence and occupancy, publish messages, and review app usage and configuration.

Streamable HTTPWeb executable
Cloud & Infrastructure15 toolsNov 7, 2026

Woffu MCP by usefulapi

io.usefulapiOfficial publisher

Hosted read-only MCP server that lets an assistant look up Woffu company users, employment contracts, departments and offices.

Streamable HTTPWeb executable
Business & Commerce5 toolsNov 7, 2026

White Label Loyalty MCP by usefulapi

io.usefulapiOfficial publisher

Hosted MCP server for White Label Loyalty: browse rewards, read a customer's points wallet and tier progress, and buy rewards with points.

Streamable HTTPWeb executable
Business & Commerce5 toolsNov 7, 2026

Weekdone MCP by usefulapi

io.usefulapiOfficial publisher

Hosted Weekdone connector that lets an assistant read weekly reports, teams, objectives and KPIs, and add report items, comments and KPI values.

Streamable HTTPWeb executable
Data & Analytics15 toolsNov 7, 2026

WebinarKit MCP by usefulapi

io.usefulapiOfficial publisher

Hosted read-only MCP server that lets an assistant list WebinarKit webinars, their dates, series, meetings and white-label sub-accounts.

Streamable HTTPWeb executable
Business & Commerce5 toolsNov 7, 2026