# Corsizio MCP by usefulapi (remote · corsizio.usefulapi.io)

Read Corsizio events, attendees and registrations, including payment status. Read-only.

- Trust score: 62/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-10-25

## Components

- remote · `corsizio.usefulapi.io`: 62/100 (this document), [markdown](https://verifymcp.io/servers/io-usefulapi-corsizio/corsizio.md), [page](https://verifymcp.io/servers/io-usefulapi-corsizio/corsizio)

## Channel facts

- Endpoint: `https://corsizio.usefulapi.io/mcp`
- Transports: `streamable-http`
- Auth: `required`
- Version: `1.2.3`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-10-25.

- **Endpoint Security**: 78/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation is enforced on tool calls, advertised via RFC 9728 protected-resource metadata. Discovery is public, which costs nothing: no tool can be invoked without a token.
  - HTTPS enforcement could not be verified: the plaintext port redirected somewhere other than https, so enforcement is unproven.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
  - The authorisation server offers only Dynamic Client Registration (RFC 7591), which MCP 2026-07-28 deprecated in favour of Client ID Metadata Documents.
- **Transport & Reachability**: 0/100
  - Transport check failed: declared streamable-http, but the endpoint redirected instead of responding directly.
- **Schema Quality & AI Usability**: 76/100
  - 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 1424 tokens (~237/item across 6 items; 6 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 3/100
  - Stability observed for 1 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 6 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 7 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 60/100
  - Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28.

## Install

### How do I install the Corsizio MCP by usefulapi server?

Corsizio MCP by usefulapi is a hosted endpoint at https://corsizio.usefulapi.io/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http io-usefulapi-corsizio 'https://corsizio.usefulapi.io/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "io-usefulapi-corsizio": {
      "url": "https://corsizio.usefulapi.io/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "io-usefulapi-corsizio": {
      "type": "http",
      "url": "https://corsizio.usefulapi.io/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.io-usefulapi-corsizio]
url = "https://corsizio.usefulapi.io/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "io-usefulapi-corsizio": {
      "type": "remote",
      "url": "https://corsizio.usefulapi.io/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add io-usefulapi-corsizio --url 'https://corsizio.usefulapi.io/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  io-usefulapi-corsizio:
    url: "https://corsizio.usefulapi.io/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "io-usefulapi-corsizio": {
      "Transport": "http",
      "Url": "https://corsizio.usefulapi.io/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add io-usefulapi-corsizio -t streamable-http -u 'https://corsizio.usefulapi.io/mcp'
```

### Other

```json
{
  "mcpServers": {
    "io-usefulapi-corsizio": {
      "type": "http",
      "url": "https://corsizio.usefulapi.io/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-10-25 (score 62, +1)

- [functional improvement] Stability: unverified → 0.03
- [functional] Server version: 1.2.0 → 1.2.3

### 2026-10-24 (score 61)

First indexed and scored.

## MCP tools (6)

### `corsizio_get_account` (~72 tokens)

Get account details

Get the Corsizio account behind the API key: name, alias, time zone, currency, site URL, contact, and the configured locations, categories, age groups, genders, levels and price ranges (their ids are the filters for corsizio_list_events). Good first call. API: GET /account.

### `corsizio_list_events` (~387 tokens)

List events

List the account's events (classes, workshops, camps) with dates, location, prices and page URLs, newest start first by default. Only published events unless status says otherwise. Filter by status, date range, price range, category/location/age/gender/level id (from corsizio_get_account) or a name word. API: GET /events.

Input parameters:

- `age` (string): Age group id (from corsizio_get_account).
- `category` (string): Category id (from corsizio_get_account).
- `date` (string): Event start/end date range FROM:TO, YYYY-MM-DD, either side optional, e.g. 2026-06-01:2026-06-30 or :2026-12-31 or just 2026 (UTC).
- `expand` (string): Replace ids with full objects, comma-separated: filters, instructors, account.
- `gender` (string): Gender id (from corsizio_get_account).
- `include` (string): Extra data, comma-separated: details, filters, stats, config.
- `level` (string): Level id (from corsizio_get_account).
- `limit` (integer): Results per page, 1-100 (default 20).
- `location` (string): Location id (from corsizio_get_account).
- `order` (string): Sort order; a leading - is descending (default -startDate).
- `page` (integer): Page number (default 1). The reply's paging.more says whether another page exists.
- `price` (string): Price range FROM:TO, e.g. 50:200, :300 (300 and under) or 1000 (1000 and over).
- `search` (string): A word in the event name, or an exact event id.
- `status` (string): Event status (default published).

### `corsizio_get_event` (~124 tokens)

Get event details

Get one event in full: dates, location, ticket prices and early-bird prices, descriptions, max spots, contact and instructors. Use include=stats for registration counts. For the attendee list use corsizio_list_attendees with the event id (or corsizio_get_event_with_attendees). API: GET /events/{id}.

Input parameters:

- `event_id` (string, required): Event id.
- `expand` (string): Replace ids with full objects, comma-separated: filters, instructors, account.
- `include` (string): Extra data, comma-separated: filters, stats.

### `corsizio_get_event_with_attendees` (~131 tokens)

Get event with its attendees

Get one event together with its attendees (and optionally each attendee's payment) in a single call. Returns personal data of registrants (names, emails, phones, notes); only use it when you need the roster, otherwise prefer corsizio_get_event or corsizio_list_attendees with a limit. API: GET /events/{id}?include=attendees[,payment].

Input parameters:

- `event_id` (string, required): Event id.
- `include_stats` (boolean): Also include registration statistics (default false).
- `with_payment` (boolean): Also include each attendee's payment details (default false).

### `corsizio_list_attendees` (~331 tokens)

List attendees (registrations)

List attendee registrations across the account, or for one event (event filter): name, email, phone, status, registration answers and dates. Default status is active. Filter by status (e.g. owing,!canceled), created-date range, event id, coupon code or a search word (name, email, phone). Returns personal data. The API key needs the attendees permission. API: GET /attendees.

Input parameters:

- `coupon` (string): Only attendees who used this coupon (the coupon code, as the vendor docs describe it).
- `date` (string): Registration (created) date range FROM:TO, YYYY-MM-DD, either side optional (UTC).
- `event` (string): Only this event's attendees (event id from corsizio_list_events).
- `expand` (string): Replace ids with full objects, comma-separated: event, account.
- `include` (string): Extra data, comma-separated: payment, activity, details.
- `limit` (integer): Results per page, 1-100 (default 20).
- `page` (integer): Page number (default 1). The reply's paging.more says whether another page exists.
- `search` (string): A word in the attendee's name, email or phone, or an exact attendee id.
- `status` (string): Comma-separated statuses (default active): any, active, waiting, archived, deleted, manual, attended, absent, payment, paid, owing, early, deposit, offline, exempt, refunded, canceled. Prefix with !…

### `corsizio_get_attendee` (~122 tokens)

Get attendee details

Get one attendee registration in full: contact data, registration answers, internal remark, status, and with include=payment the amount, fees, taxes, refunds and transactions (card brand and last 4 digits). Returns personal data. The API key needs the attendees permission. API: GET /attendees/{id}.

Input parameters:

- `attendee_id` (string, required): Attendee id.
- `expand` (string): Replace ids with full objects, comma-separated: event, account.
- `include` (string): Extra data, comma-separated: payment, activity, details.

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/io-usefulapi-corsizio/corsizio#diagnostics

## Score history

- 2026-10-25: 62
- 2026-10-24: 61

## Common questions

### What is the Corsizio MCP by usefulapi server?

Corsizio MCP by usefulapi is listed in the public MCP registry as io.usefulapi/corsizio. Read Corsizio events, attendees and registrations, including payment status. Read-only. This page covers its hosted endpoint (https://corsizio.usefulapi.io/mcp).

### Is the Corsizio MCP by usefulapi server safe to use?

Corsizio MCP by usefulapi scores 62 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the Corsizio MCP by usefulapi server expose?

Corsizio MCP by usefulapi exposes 6 tools: corsizio_get_account, corsizio_list_events, corsizio_get_event, corsizio_get_event_with_attendees, corsizio_list_attendees, corsizio_get_attendee. Their descriptions and schemas cost roughly 1,167 tokens of context every time the server is loaded.

### Does the Corsizio MCP by usefulapi server require authentication?

Yes. Corsizio MCP by usefulapi asked us for credentials when we connected, so you will need to authorise it in your MCP client before it can do anything.

### Is the Corsizio MCP by usefulapi server still maintained?

Corsizio MCP by usefulapi is still listed as active in the MCP registry. We last reached this channel on 25 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://corsizio.usefulapi.io/mcp
- Repository: https://github.com/m190/usefulapi-mcp
- Website: https://usefulapi.io/corsizio/
- Changelog RSS feed: https://verifymcp.io/servers/io-usefulapi-corsizio/corsizio.xml
- Changelog JSON feed: https://verifymcp.io/servers/io-usefulapi-corsizio/corsizio.json
- HTML version of this page: https://verifymcp.io/servers/io-usefulapi-corsizio/corsizio