# Book a Sponsor (remote · bookasponsor.com)

Find brands that already sponsor newsletters like yours, with sponsorship rates.

- Trust score: 86/100 (high trust)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- remote · `bookasponsor.com`: 86/100 (this document), [markdown](https://verifymcp.io/servers/com-bookasponsor-book-a-sponsor/bookasponsor.md), [page](https://verifymcp.io/servers/com-bookasponsor-book-a-sponsor/bookasponsor)

## Channel facts

- Endpoint: `https://bookasponsor.com/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.0.0`

## 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 2026-11-05.

- **Endpoint Security**: 74/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one.
  - HTTPS is enforced; there's no plaintext access path.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 82/100
  - AI-judged instruction clarity (excellent).
  - Tool/resource definitions use about 454 tokens (~113/item across 4 items; 4 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 97/100
  - Stability observed for 29 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.
  - Structured output schemas are declared (100% of tools); any adoption earns full credit.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 4 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 5 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### How do I install the Book a Sponsor MCP server?

Book a Sponsor is a hosted endpoint at https://bookasponsor.com/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 com-bookasponsor-book-a-sponsor 'https://bookasponsor.com/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "com-bookasponsor-book-a-sponsor": {
      "url": "https://bookasponsor.com/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "com-bookasponsor-book-a-sponsor": {
      "type": "http",
      "url": "https://bookasponsor.com/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.com-bookasponsor-book-a-sponsor]
url = "https://bookasponsor.com/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "com-bookasponsor-book-a-sponsor": {
      "type": "remote",
      "url": "https://bookasponsor.com/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add com-bookasponsor-book-a-sponsor --url 'https://bookasponsor.com/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  com-bookasponsor-book-a-sponsor:
    url: "https://bookasponsor.com/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "com-bookasponsor-book-a-sponsor": {
      "Transport": "http",
      "Url": "https://bookasponsor.com/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add com-bookasponsor-book-a-sponsor -t streamable-http -u 'https://bookasponsor.com/mcp'
```

### Other

```json
{
  "mcpServers": {
    "com-bookasponsor-book-a-sponsor": {
      "type": "http",
      "url": "https://bookasponsor.com/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.

### 2026-11-05 (score 86, +1)

No change was recorded against any check on this day. Stability & Change Management went from 93 to 97. That category is still filling its 30-day observation window: 28 days of observed history at the previous scan, 29 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-02 (score 85, +1)

No change was recorded against any check on this day. Stability & Change Management went from 83 to 87. That category is still filling its 30-day observation window: 25 days of observed history at the previous scan, 26 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-31 (score 84, +1)

No change was recorded against any check on this day. Stability & Change Management went from 77 to 80. That category is still filling its 30-day observation window: 23 days of observed history at the previous scan, 24 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-29 (score 83, +1)

No change was recorded against any check on this day. Stability & Change Management went from 70 to 73. That category is still filling its 30-day observation window: 21 days of observed history at the previous scan, 22 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-27 (score 82, +1)

No change was recorded against any check on this day. Stability & Change Management went from 63 to 67. That category is still filling its 30-day observation window: 19 days of observed history at the previous scan, 20 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-25 (score 81, +1)

No change was recorded against any check on this day. Stability & Change Management went from 57 to 60. That category is still filling its 30-day observation window: 17 days of observed history at the previous scan, 18 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-23 (score 80, +1)

No change was recorded against any check on this day. Stability & Change Management went from 50 to 53. That category is still filling its 30-day observation window: 15 days of observed history at the previous scan, 16 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-21 (score 79, +1)

No change was recorded against any check on this day. Stability & Change Management went from 43 to 47. That category is still filling its 30-day observation window: 13 days of observed history at the previous scan, 14 at this one. The score rises as the window fills, whether or not the server changes.

## MCP tools (4)

### `find_newsletter_sponsors` (~111 tokens)

Find sponsors for a newsletter

Use this when someone who runs a newsletter asks which brands might sponsor it or how to find sponsors for it. Takes the newsletter's web address, finds similar newsletters, and returns the brands that sponsored them, with the newsletters and dates where each ad ran. Starts a scan of the public newsletter pages if none exists; a new scan takes about 15 to 60 seconds.

Input parameters:

- `newsletter_url` (string, required): The newsletter's web address, such as yourname.substack.com or yournewsletter.com

Output parameters:

- `message` (string)
- `newsletter`
- `results_url` (string|null)
- `similar_newsletters` (array)
- `sponsors` (array)
- `sponsors_total` (number)
- `status` (string)

### `get_sponsor_scan` (~67 tokens)

Get a newsletter sponsor scan

Use this to read the result of a sponsor scan that find_newsletter_sponsors started, for example when it reported that the scan was still running. Takes the same newsletter web address.

Input parameters:

- `newsletter_url` (string, required): The newsletter's web address used for find_newsletter_sponsors

Output parameters:

- `message` (string)
- `newsletter`
- `results_url` (string|null)
- `similar_newsletters` (array)
- `sponsors` (array)
- `sponsors_total` (number)
- `status` (string)

### `list_brands_sponsoring_newsletters` (~115 tokens)

List brands sponsoring newsletters

Use this when someone asks which companies or brands sponsor newsletters, overall or in a topic such as AI, finance or marketing. Returns the brands seen in the most newsletters in the last 12 months, mostly read from published issues.

Input parameters:

- `niche` (string): Newsletter topic: ai, business, finance, tech, marketing, health, culture, food, productivity, crypto, dev, design, science, education, sports, climate, media, local, legal, travel. Leave out for all…

Output parameters:

- `brands` (array)
- `brands_seen` (number)
- `newsletters_read` (number)
- `niche` (string|null)
- `source_url` (string)
- `updated` (string)

### `get_newsletter_sponsorship_rates` (~78 tokens)

Get newsletter sponsorship rates

Use this when someone asks how much to charge for a newsletter sponsorship or what newsletters charge for an ad. Returns the median price newsletters list for the main sponsor slot of one issue, by list size, read from their own advertise pages.

Input parameters:

- `subscribers` (integer): The newsletter's subscriber count, to pick its size band

Output parameters:

- `bands` (array)
- `newsletters_priced` (number)
- `read_on` (string)
- `source_url` (string)
- `your_band` (string|null)

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/com-bookasponsor-book-a-sponsor/bookasponsor#diagnostics

## Score history

- 2026-11-05: 86
- 2026-11-04: 85
- 2026-11-03: 85
- 2026-11-02: 85
- 2026-11-01: 84
- 2026-10-31: 84
- 2026-10-30: 83
- 2026-10-29: 83
- 2026-10-28: 82
- 2026-10-27: 82
- 2026-10-26: 81
- 2026-10-25: 81
- 2026-10-24: 80
- 2026-10-23: 80
- 2026-10-22: 79
- 2026-10-21: 79
- 2026-10-20: 78
- 2026-10-19: 78
- 2026-10-18: 78
- 2026-10-17: 77
- 2026-10-16: 77
- 2026-10-15: 76
- 2026-10-14: 66
- 2026-10-13: 75
- 2026-10-12: 75
- 2026-10-10: 74

## Common questions

### What is the Book a Sponsor MCP server?

Book a Sponsor is an MCP server listed in the public MCP registry as com.bookasponsor/book-a-sponsor. Find brands that already sponsor newsletters like yours, with sponsorship rates. This page covers its hosted endpoint (https://bookasponsor.com/mcp).

### Is the Book a Sponsor MCP server safe to use?

Book a Sponsor scores 86 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 Book a Sponsor MCP server expose?

Book a Sponsor exposes 4 tools: find_newsletter_sponsors, get_sponsor_scan, list_brands_sponsoring_newsletters, get_newsletter_sponsorship_rates. Their descriptions and schemas cost roughly 371 tokens of context every time the server is loaded.

### Does the Book a Sponsor MCP server require authentication?

No. We connected to Book a Sponsor without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the Book a Sponsor MCP server still maintained?

Book a Sponsor is still listed as active in the MCP registry. We last reached this channel on 5 November 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://bookasponsor.com/mcp
- Website: https://bookasponsor.com/
- Changelog RSS feed: https://verifymcp.io/servers/com-bookasponsor-book-a-sponsor/bookasponsor.xml
- Changelog JSON feed: https://verifymcp.io/servers/com-bookasponsor-book-a-sponsor/bookasponsor.json
- HTML version of this page: https://verifymcp.io/servers/com-bookasponsor-book-a-sponsor/bookasponsor