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# Marketing API

1 endpoints — Same auth, same credit pool, same JSON envelope. Use them directly from apps, content sites, workflows, or agents without rebuilding formulas, validation, and docs for each tool.
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[
CTR Calculator ctr-calculator
Calculate click-through rate, required clicks for a target CTR, or bulk campaign CTR.
1cr · v2026-04-22
](/tools/ctr-calculator/)
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