Spillmark
Free Amazon and Meta ads calculators. No brand data and no key.
What it does
Spillmark is an MCP server, a connector that lets an AI assistant use it as a tool. It is hosted: an assistant connects to it over the internet, nothing to install.
No capability identified yet from its description.
Facts come from the Official MCP Registry, as declared by the publisher. Capabilities are matched automatically (low confidence). None of this is a test of the tool.
At a glance
How to connect
As declared in the Official MCP Registry · hosted endpoint tested by Electra Index 1h ago (live check)Hosted endpoint
https://spillmark.com/mcpstreamable-http
In Claude Code: claude mcp add --transport http spillmark https://spillmark.com/mcp
MCP settings (Claude Desktop, Cursor and other MCP clients)
{
"mcpServers": {
"spillmark": {
"url": "https://spillmark.com/mcp"
}
}
}Live check
Electra Index connected to the hosted endpoint 1h agoONLINE Spillmark answered an MCP connection on 25 Oct 2026 and introduced itself as spillmark 0.1.0 (MCP protocol 2025-06-18).
3 tools offered to AI assistants
list_calculators· 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· 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 examplhow_lift_is_calculated· 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.
What "online" means: the server answered an MCP connection at the time of the check. It is not a guarantee of security, quality or continuous uptime. How we test: we open an MCP session and ask for the tool list, as an AI assistant would. We never run a tool and never send a key. Checked every few days. Method
Is this your server? Monitoring Pro: a check every 30 minutes and an email within the hour when it stops answering. Launch offer: $39.99 once, for life.
Facts & evidence
Each fact shows where it was seen and when.| Fact | Value | Evidence | Source | Last confirmed |
|---|---|---|---|---|
| Hosted endpoint | https://spillmark.com/mcp | DECLARED | SRC-001 Official MCP Registry | 1h ago |
| Local install (package) | no | DECLARED | SRC-001 Official MCP Registry | 1h ago |
| Remote access (hosted) | yes | DECLARED | SRC-001 Official MCP Registry | 1h ago |
| Registry status | active | DECLARED | SRC-001 Official MCP Registry | 1h ago |
| Version | 1.0.0 | DECLARED | SRC-001 Official MCP Registry | 1h ago |
| MCP server | yes | DECLARED | SRC-001 Official MCP Registry | 1h ago |
Change history
- NEW25 Oct 2026first seen in the index
Is this page accurate?
Flag it and our robot re-checks the official source. Reports never change a score.Is Spillmark still online?
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<a href="https://electraindex.com/mcp/spillmark?utm_source=badge&utm_medium=share&utm_campaign=listing"><img src="https://electraindex.com/api/badge/spillmark" alt="Listed on Electra Index"></a>Questions about Spillmark
How do I connect Spillmark?
Use the hosted endpoint https://spillmark.com/mcp in your assistant's MCP settings. The exact settings are in "How to connect" above, as declared in the Official MCP Registry.
What tools does Spillmark offer?
When Electra Index connected on 25 Oct 2026, it listed 3 tools: list_calculators, run_calculator, how_lift_is_calculated. The full list is in "Live check" above.
Is Spillmark online?
Yes. Its hosted endpoint answered an MCP connection from Electra Index 1h ago.