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PopNx MCPMCP servers for people who use AI · explained in plain words

Castos MCP by usefulapi

by m190version 1.3.1i★ 1 (Stars for the whole repo)iRuns in the cloud
Registry nameio.usefulapi/castos

How to install

What it does

Read podcasts and episodes; create and update episodes; manage private subscribers in Castos.

  • Connects Runs in the cloud
  • Account or key No key needed
  • Category Games, sports, food & learning

Install

Pick the AI app you use, then copy the settings.

Passed 4/4 checks · What you ask goes through the maker’s server (castos.usefulapi.io) · ✓ Commands checked Nov 13, 2026

First: which AI do you use?

Pick your app and the steps appear below.

Works with Claude · about 2 min

No key, nothing to install · Set it up once on claude.ai or the desktop app, then use it in chat · free accounts can add 1 · on Team/Enterprise an Owner adds it

  1. Open Claude’s Connectors page

    CustomizeConnectors

    CustomizeConnectors1Add2https://…3Add4
  2. Click “Add” → “Custom” → “Web” and fill in these 2 fields

    Copy each value into the field with the same name in Claude, then click Continue

    Name · NameCastos MCP by usefulapi
    Remote MCP server URL · Addresshttps://castos.usefulapi.io/mcp

    Click Continue past the sign-in settings Claude detected · under Authentication choose what the maker says (Sign in now, Sign in when needed or No sign in), then click Add

  3. Turn it on in a chat

    +ConnectorsCastos MCP by usefulapi

  4. Try it

    Use Castos MCP by usefulapi and tell me what you can do for me, then show me one thing

    ✓ If Claude says it is using Castos MCP by usefulapi or shows a Castos MCP by usefulapi tool in the answer, you are connected

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with ChatGPT, depending on your plan

Full MCP: ChatGPT Business, Enterprise or Edu on the web · Pro: connects with read/fetch permissions, so tools that change data may not work · Plus: not confirmed in OpenAI’s docs; if you see an add-custom-MCP option on the Plugins page you can try these steps · web only

  1. Open ChatGPT’s add-MCP page on the web

    Plugins+Add custom MCP server

    ChatGPTPlugins1+2https://…3Create4
  2. Fill in the name and address

    Enter a name, paste the address under Connection, tick the risk warning and click Create as a plugin

    Name · NameCastos MCP by usefulapi
    Connection · Addresshttps://castos.usefulapi.io/mcp
  3. Pick Castos MCP by usefulapi in a chat

    Start a new chat and pick Castos MCP by usefulapi from your plugins before typing

  4. Try it

    Use Castos MCP by usefulapi and tell me what you can do for me, then show me one thing

    ✓ If ChatGPT says it is using Castos MCP by usefulapi or shows a Castos MCP by usefulapi tool in the answer, you are connected

Menu names checked against OpenAI’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with Claude Code · about 2 min

No key, nothing to install

  1. Open Terminal

    Mac: press Command+Space and type Terminal · Windows: open PowerShell

  2. Paste this command and press Enter

    claude mcp add --transport http --scope user castos https://castos.usefulapi.io/mcp
  3. Type /mcp in Claude Code

    You should see Castos MCP by usefulapi listed as connected

  4. Try it

    Use Castos MCP by usefulapi and tell me what you can do for me, then show me one thing

    ✓ If Claude Code says it is using Castos MCP by usefulapi or shows a Castos MCP by usefulapi tool in the answer, you are connected

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with Cursor · about 2 min

No key, nothing to install

  1. Click this button to open Cursor

    Open in Cursor

    Cursor asks you to confirm; click Install

  2. Open the AI chat in Cursor in Agent mode

  3. Try it

    Use Castos MCP by usefulapi and tell me what you can do for me, then show me one thing

    ✓ If Cursor says it is using Castos MCP by usefulapi or shows a Castos MCP by usefulapi tool in the answer, you are connected

Menu names checked against Cursor’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with VS Code · about 2 min

No key, nothing to install

  1. Click this button to open VS Code

    Open in VS Code

    VS Code asks you to confirm; click Install

  2. Open the AI chat in VS Code in Agent mode

  3. Try it

    Use Castos MCP by usefulapi and tell me what you can do for me, then show me one thing

    ✓ If VS Code says it is using Castos MCP by usefulapi or shows a Castos MCP by usefulapi tool in the answer, you are connected

Menu names checked against VS Code’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Other apps that use MCP, such as Windsurf, Zed or Gemini CLI, each add servers differently. See how in the app list.

See every app that uses MCP →

Address for apps that connect over the web

Addresshttps://castos.usefulapi.io/mcp

JSON settings are under “For developers” below

Stuck? Ask people who use Castos MCP by usefulapi💬 Discussion →
For developers: Terminal commands and JSON settings

Over the web

Claude Code

claude mcp add --transport http --scope user castos https://castos.usefulapi.io/mcp

Cursor (~/.cursor/mcp.json)

{
  "mcpServers": {
    "castos": {
      "url": "https://castos.usefulapi.io/mcp"
    }
  }
}

VS Code (mcp.json)

{
  "servers": {
    "castos": {
      "type": "http",
      "url": "https://castos.usefulapi.io/mcp"
    }
  }
}

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

At a glance

GitHub starsi
1 (Stars for the whole repo)
This repo holds several MCP listings; its stars count once in rankings
Downloads per weeki
Not on npm/PyPI
Verified domain
✓ usefulapi.io
Connection
Runs in the cloud
Transport
streamable-http
Latest versioni
1.3.1
Published to registryi
Nov 13, 2026
Code last changedi
Nov 14, 2026
Maker
m190
Registry status
Active

Which apps can use it

Based on how this server connects and on each app’s own docs, checked Nov 10, 2026.

Connect over the internet in

ClaudeChatGPTGooseLM StudioMsty StudioCherry StudioCursorVS Code + GitHub CopilotVisual StudioWindsurf (Devin Desktop)ZedKiroClineContinueJetBrains AI AssistantClaude CodeCodex CLIGemini CLIOpenCodenodecodeWarpLibreChatOpen WebUIRaycast

All apps, with pros and cons →

Related guides

What it can do

Tool names and descriptions exactly as the server reported them on Nov 14, 2026. The maker wrote them, not us; we show them as plain text.

  • castos_list_podcasts

    List the podcasts on the authenticated Castos account, with title, description, language and feed settings. Castos API: GET /podcasts.

  • castos_get_podcast

    Get one podcast by id, with its settings and metadata. Castos API: GET /podcasts/{podcast_id}.

  • castos_update_podcast

    WRITE. Change the metadata of an existing podcast. Only the fields you pass are sent. It does not change the cover image, the feed redirect or the episodes. Castos API: POST /podcasts/{podcast_id}.

  • castos_list_episodes

    List the episodes of one podcast, with id, title, created date and publish date. Castos API: GET /podcasts/{podcast_id}/episodes.

  • castos_get_episode

    Get one episode of a podcast by id, with its title, notes and audio details. Castos API: GET /podcasts/{podcast_id}/episodes/{episode_id}.

  • castos_create_episode

    WRITE. Add a new episode to a podcast. The audio is downloaded from episode_file_url (https, up to 40 MB) and uploaded to Castos. The episode may publish to the live feed at once, so check the publish date. Castos API: POST /podcasts/{podcast_id}/episodes (multipart).

  • castos_update_episode

    WRITE. Change the text or settings of an existing episode. Only the fields you pass are sent. To replace the audio, pass updated_episode_file as a public https URL. Castos API: POST /podcasts/{podcast_id}/episodes/{episode_id}.

  • castos_list_private_subscribers

    List the private subscribers of one podcast, one page at a time. Castos API: GET /private-subscribers.

  • castos_get_private_subscriber

    Get one private subscriber by subscriber id. Castos API: GET /private-subscribers/{subscriber_id}.

  • castos_get_private_subscriber_by_email

    Find a private subscriber by email. The reply lists the subscriber and its subscriptions; the subscription id is what castos_revoke_private_subscriber needs. Castos API: GET /private-subscribers/email/{email_address}.

  • castos_create_private_subscriber

    WRITE. Add an email address as a private subscriber of a podcast, so it can access the private feed. Castos API: POST /private-subscribers.

  • castos_reactivate_private_subscriber

    WRITE. Reactivate a private subscriber by subscriber id, for example after a revoke by mistake. Castos API: POST /private-subscribers/reactivate/{subscriber_id}.

  • castos_revoke_private_subscriber

    WRITE. Cancel one private subscription, so the subscriber loses access to that private feed. Pass the subscription id (see castos_get_private_subscriber_by_email). Castos API: POST /private-subscribers/{subscription_id}.

  • castos_list_categories

    List the podcast categories that Castos accepts for the itunes_category fields. Castos API: GET /get-categories.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 14, 2026

  • ✓ Pass

    Maker matches the repo

    The registry name was verified against the domain usefulapi.io (the registry checks domain ownership)

  • ✓ Pass

    Still maintained

    Code last changed today

  • – Not applicable

    Has a licence

    Not applicable: a cloud server run by the owner of usefulapi.io; you don't run code from the repo

  • ✓ Pass

    Endpoint responds

    Responded in 690 ms (HTTP 200)

  • – Not applicable

    Sign-in with OAuth

    No sign-in needed

  • ✓ Pass

    No hidden instructions in tool descriptions

    Read 14 tool descriptions and found no hidden instructions to the AI

Discussion

Ask, share a tip or report that it does not work. Sorted by what people marked helpful.

No posts yet. Be the first to ask or share.

Posts here are written by users, not the PopNx team.

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User reviews

No reviews yet

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Compared with others in Games, sports, food & learningi

  • More stars than 0% of the other 1486 servers in this category
  • Published to the registry more recently than 98% of the other 1486 servers in this category
  • Basic checks equal to or better than 100% of the other 1486 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Castos MCP by usefulapi safe?

It passed 4 of 4 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs in the maker’s cloud. Connect over the internet with nothing to install, but what you send passes through the maker’s servers.

Is it still maintained?

The GitHub repo last changed today, and the latest version (1.3.1) reached the registry yesterday.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT on the web (full MCP on Business and above; Pro read-only).

What can I use instead?

In the same category: Honcho, ShipSwift, Pm Claude Skills

Others in the same category

Servers in the same category from other makers, sorted by stars.

Reading a card:↓ Downloads per weeki★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

Honcho

Memory that reasons: continual learning for stateful agents. Better context, fewer tokens.

by plastic-labsWidely used★ 8.1KUpdated 3 months ago

Runs in the cloud

ShipSwift

40+ production-ready SwiftUI recipes for building full-stack iOS apps via MCP.

by signerlabsWidely used★ 3.3KUpdated 9 months ago

Runs in the cloud

Pm Claude Skills

1310 professional Agent Skills + workflow recipes — searchable & fetchable over MCP.

by mohitagw15856Widely used↓ 2.5K/wk★ 1.5KUpdated 22 days ago

Runs on your computer

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

Castos MCP by usefulapi

Use your Castos account from Claude, Cursor, or any MCP client. Read podcasts and episodes, create and update episodes, and manage private subscribers. Hosted, no local install: connect with your own credentials.

Live endpoint: https://castos.usefulapi.io/mcp · Homepage: https://usefulapi.io

Connect

  • Claude (claude.ai, Desktop): open Customize → Connectors, click + Add → Add custom connector, and paste https://castos.usefulapi.io/mcp.
  • Claude Code: claude mcp add --transport http castos https://castos.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:
{

"mcpServers": { "castos": { "url": "https://castos.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 Castos credentials.

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

On first connect you provide your Castos API token (account avatar → Account Settings → Publish Settings). The server validates it and stores it per user. No keys go in config files.

Tools

ToolTypeWhat it does
castos_list_podcastsreadList podcasts
castos_get_podcastreadGet a podcast
castos_update_podcastwriteUpdate a podcast
castos_list_episodesreadList episodes
castos_get_episodereadGet an episode
castos_create_episodewriteCreate an episode
castos_update_episodewriteUpdate an episode
castos_list_private_subscribersreadList private subscribers
castos_get_private_subscriberreadGet a private subscriber
castos_get_private_subscriber_by_emailreadFind a private subscriber by email
castos_create_private_subscriberwriteAdd a private subscriber
castos_reactivate_private_subscriberwriteReactivate a private subscriber
castos_revoke_private_subscriberwriteRevoke a private subscription
castos_list_categoriesreadList podcast categories
castos_usage_statusmetaUsage status (free-tier meter)
castos_request_featuremetaRequest a missing feature
castos_upgrademetaUpgrade to Pro or Pro+
castos_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 support@usefulapi.io.

Pro covers this server only. Subscribe with castos_upgrade (it returns a Stripe Checkout link). Cancel any time with castos_cancel_subscription: Pro continues to the end of the paid period, with no refund for the current period, and running castos_upgrade before then undoes the cancel. Or write to support@usefulapi.io.

License

MIT — see LICENSE. Documentation only; the server is hosted.