Spillmark
Free Amazon and Meta ads calculators. No brand data and no key.
Use Meta Ads (Facebook Ads) with: ChatGPT · Claude · Cursor · Claude Code · VS Code
Connect it
Settings → Connectors → Add custom connector
URL: https://spillmark.com/mcpSettings → Apps & Connectors → Advanced → Developer mode
Create connector with URL: https://spillmark.com/mcp{
"mcpServers": {
"spillmark": {
"url": "https://spillmark.com/mcp"
}
}
}claude mcp add --transport http spillmark https://spillmark.com/mcp{
"servers": {
"spillmark": {
"type": "http",
"url": "https://spillmark.com/mcp"
}
}
}3 tools, pulled live
list_calculatorsread-onlySpillmark'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_calculatorread-onlyRuns 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 as the option index.
how_lift_is_calculatedread-onlySpillmark'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.
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