MCP server

Spillmark Official

com.spillmark/spillmark

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

Free Amazon and Meta ads calculators. No brand data and no key.

At a glance

Type

MCP server

Publisher

spillmark.com (verified by the MCP Registry)

Status

Working at last check

Tools

3

Token cost

About 501 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http spillmark https://spillmark.com/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.spillmark]
url = "https://spillmark.com/mcp"

Gemini CLI

{"mcpServers":{"spillmark":{"httpUrl":"https://spillmark.com/mcp"}}}

Cursor

{"mcpServers":{"spillmark":{"url":"https://spillmark.com/mcp"}}}

VS Code

{"servers":{"spillmark":{"type":"http","url":"https://spillmark.com/mcp"}}}

Antigravity

agy mcp add spillmark https://spillmark.com/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"spillmark","server_url":"https://spillmark.com/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"spillmark","server_url":"https://spillmark.com/mcp"}

Tools

• how_lift_is_calculated ~91 tokens
  Spillmark's method in brief: how a geo holdout test measures the sales Meta ads cause on Amazon, with links to the full method and a sample report on made-up numbers.
• list_calculators ~140 tokens
  Spillmark's free Amazon and Meta ads calculators (holdout test size, incremental ROAS, break-even ROAS, ACoS, TACoS, Amazon fees and profit, LTV and CAC), with each one's inputs and example values. Use run_calculator to run one.
• run_calculator ~270 tokens
  Runs one calculator from list_calculators on your numbers and returns the headline result, the supporting figures, a one-sentence reading, and a link that opens the calculator with the same inputs. Missing inputs use the calculator's example values. Enter percents as points (15 means 15%), choices a

Browse

• Advertising

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