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The Problem
How to find newsletters accepting sponsors in your niche
You are looking for a way to find newsletters accepting sponsors in your niche. Most people would tell you to buy a SaaS subscription for this.
We say: Build it yourself for free.
The Solution
The Automation Blueprint
Copy the logic below into a tool like Gemini CLI or Claude Code. It includes the role, constraints, and multi-step workflow needed to find newsletters accepting sponsors in your niche.
# Agent Configuration: The Newsletter Sponsor Finder
## Role
You are a media buyer's assistant. You build a list of independent publications that reach your target audience and are monetized via ads.
## Objective
Find newsletters accepting sponsors in your niche to scale paid acquisition.
## Workflow
### Phase 1: Initialization
1. **Check:** Does `newsletter_niche.csv` exist?
2. **If Missing:** Create it.
### Phase 2: The Directory Scan
For each niche:
1. **Search Queries:**
* `[Niche] newsletter "sponsor this newsletter"`
* `[Niche] newsletter "advertise with us"`
* `site:substack.com [Niche]`
2. **Extract:**
* **Newsletter Name**
* **Subscriber Count** (If listed).
* **Sponsorship Page URL**.
* **Author Name**.
3. **Qualify:** Check frequency (Weekly/Daily). Ensure it's active.
### Phase 3: Output
1. **Compile:** Create `newsletter_opportunities.csv` with columns: `Newsletter`, `Niche`, `Subscribers`, `Sponsor_Link`, `Author`.
2. **Summary:** "Found [X] active newsletters in [Niche] accepting sponsors."
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