Systems Lab

Agent skill

sponsored-newsletter-finder

Discover newsletters in a target niche relevant to your ICP, evaluate audience fit, estimate reach and CPM, and output a ranked shortlist of sponsorship opportunities.

dormantSelf-containedActs undeclared958 words

Filed under Content and SEO.

From edupegoretti/fluidz-skills · 116 skills · 0 · pushed 2026-03-11

What it does when it runs

Discover newsletters in a target niche relevant to your ICP, evaluate audience fit, estimate reach and CPM, and output a ranked shortlist of sponsorship opportunities. Uses web search to find newsletters, then scores each against ICP alignment criteria. Use when a marketing team wants to reach an existing engaged audience for less than the cost of building their own, or when testing a new channel before committing.

Read from the skill and the 1 file bundled beside it. A skill’s own description is written to be selected by an agent, so it describes the job and not the dependencies.

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Ask about sponsored-newsletter-finder

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git clone --depth 1 --filter=blob:none --sparse https://github.com/edupegoretti/fluidz-skills.git /tmp/fluidz-skills
git -C /tmp/fluidz-skills sparse-checkout set "skills/composites/sponsored-newsletter-finder"
mkdir -p ~/.claude/skills/sponsored-newsletter-finder
cp -R "/tmp/fluidz-skills/skills/composites/sponsored-newsletter-finder/." ~/.claude/skills/sponsored-newsletter-finder/

Picked up without a restart. A project skill of the same name is shadowed by your personal one. For one repository only, swap ~/.claude/skills for .claude/skills. Claude Code docs ↗

The folder is the same in every client that implements the format — 46 of them — so if yours is not above, only the destination changes.

Reproduced in full from edupegoretti/fluidz-skills/blob/a2cf697e2e8ec2ea517d85496e2d5c7f5dc44cd3/skills/composites/sponsored-newsletter-finder/SKILL.md, which is licensed MIT (repository). 958 words, 25 headings.

Sponsored Newsletter Finder

Find newsletters your ICP reads, evaluate their audience fit, and produce a ranked shortlist ready for outreach. Cheaper and faster than building your own list from scratch — newsletters already have the trust and the audience.

Best for: Seed/Series A teams with $500-5,000/month to test a paid distribution channel. Not for companies without budget or companies targeting a mass-market ICP.

When to Use

  • "Find newsletters I can sponsor to reach [ICP]"
  • "What newsletters does my target audience read?"
  • "I want to test newsletter sponsorship — where should I start?"
  • "Give me a ranked list of newsletters for [industry/role]"

Phase 0: Intake

  1. ICP definition — Target title, industry, company stage (e.g., "VP of Sales at Series A-C B2B SaaS companies")
  2. Monthly budget — Rough range for sponsorships (e.g., "$1,000-3,000/month")
  3. Geography — US only, global, or specific region?
  4. Campaign goal — Awareness (brand mention) or direct response (signup/demo)?
  5. Any newsletters you're already subscribed to or know about in this space? (Seeds the search)

Phase 1: Discovery via Web Search

Search for newsletters using multiple angles:

Search Queries to Run

"[ICP industry] newsletter" sponsorship
"[ICP role] newsletter" site:substack.com OR site:beehiiv.com
"best newsletters for [ICP role/industry]"
"[ICP industry] newsletter" "advertise" OR "sponsor"
"[competitor company] newsletter sponsorship" (find where competitors are already advertising)
newsletter directory "[ICP industry]"

Also search curated newsletter directories:

  • newsletter.directory for category browsing
  • paved.com for sponsorship marketplace listings
  • swapstack.co for newsletter ad network
  • sparkloop.co for referral partnerships

Collect: newsletter name, URL, estimated subscribers, topics covered, sponsorship page URL if found.

Phase 2: Evaluate Each Newsletter

For each discovered newsletter, score across 5 dimensions (1-5 each):

Scoring Criteria

Dimension135
Audience matchUnrelated audiencePartial overlapDirect ICP match
Reach<1,000 subscribers5,000-20,00020,000+
EngagementNo open rate data~30-40% open rate40%+ open rate
Niche specificityGeneric business newsletterIndustry newsletterRole-specific newsletter
Sponsor accessibilityNo sponsor info foundInquiry requiredClear pricing / marketplace listing

Total score: /25. Shortlist newsletters scoring ≥ 15.

Data Points to Find for Each Newsletter

Search for:

  • Subscriber count (often on the "About" or "Advertise" page)
  • Open rate (sometimes disclosed, often ~40-50% for niche newsletters)
  • CPM or flat sponsorship rate
  • Audience demographics (if disclosed)
  • Past sponsors (who's already buying? = validation)
  • Send frequency (weekly, daily, etc.)

For newsletters with no pricing page, estimate CPM from industry benchmarks:

  • Micro (<5k subs): $50-150 flat rate
  • Small (5k-20k subs): $100-500 flat rate
  • Mid (20k-50k subs): $500-2,000 flat rate
  • Large (50k+ subs): $1,000-10,000 flat rate

Phase 3: Competitive Intelligence

Check if known competitors are sponsoring newsletters in this space:

Search: "[competitor name]" "sponsored by" newsletter
Search: "[competitor name]" advertisement site:substack.com

If a competitor is sponsoring a newsletter, it's validated audience fit — flag it as high priority.

Phase 4: Output Format

# Newsletter Sponsorship Shortlist — [DATE]
ICP: [description] | Budget: [range] | Goal: [awareness/direct response]

---

## Tier 1 — High Priority (Score 20-25)

### 1. [Newsletter Name]
- **URL:** [url]
- **Subscribers:** [N] (~[source])
- **Open rate:** [X%] (disclosed/estimated)
- **Audience:** [description]
- **Send frequency:** [weekly/daily/etc]
- **Sponsorship type:** [dedicated / classified / banner mention]
- **Estimated cost:** $[X] per send
- **Estimated CPM:** $[X]
- **Past sponsors:** [list — competitive validation]
- **Score:** [X/25]
- **Fit rationale:** [1-2 sentences on why this is a strong match]
- **Sponsor page:** [url or "inquiry required"]

### 2. [Newsletter Name]
...

---

## Tier 2 — Worth Testing (Score 15-19)

### 1. [Newsletter Name]
...

---

## Tier 3 — Watchlist (Score 10-14)
(Monitor these — audience fit is good but reach or accessibility is limited)

---

## Where Competitors Are Already Advertising

| Newsletter | Competitor | Notes |
|-----------|-----------|-------|
| [Name] | [Competitor] | Validated ICP match |
...

---

## Budget Allocation Recommendation

Given budget of [X]/month and campaign goal of [goal]:

| Newsletter | Send frequency | Cost per send | Sends/month | Monthly cost |
|-----------|---------------|--------------|-------------|-------------|
| [Name] | Weekly | $[X] | 4 | $[X] |
| [Name] | Bi-weekly | $[X] | 2 | $[X] |
| **Total** | | | | $[X] |

**Recommended test:** Start with [Newsletter 1] for 2 sends to validate conversion rate before expanding.

---

## Outreach Templates

### Cold outreach to newsletter with no sponsor page:

Subject: Sponsoring [Newsletter Name] — [Your Company]

> Hi [Name],
>
> I'm [Name] from [Company] — we [one-line pitch]. We're fans of [Newsletter Name] and think our audience overlap is strong: [ICP match rationale].
>
> Would you be open to a sponsored mention or dedicated send? Happy to share what we're looking for and see if it's a fit.
>
> [Name]

### Request for media kit:

> Hi [Name] — big fan of [Newsletter Name]. Could you share your media kit and current sponsorship rates? [Your Company] is evaluating newsletter partnerships for Q[X].

Save to clients/<client-name>/intelligence/newsletter-sponsors-[YYYY-MM-DD].md.

Cost

ComponentCost
Web search (discovery phase)Free
All analysis and scoringFree (LLM reasoning)
TotalFree

Tools Required

  • web_search — for newsletter discovery and verification
  • No API keys required

Trigger Phrases

  • "Find newsletters I can sponsor to reach [ICP]"
  • "What newsletters does [title/industry] read?"
  • "Run newsletter sponsorship research for [client]"
  • "I want to test paid newsletter distribution — where should I start?"

Files bundled with it

These load only when the skill asks for them, so they cost nothing until it runs.

Other skills for the same job

Different authors, same problem. Matched on the words in the skill name, across every library in the catalogue except this one.

Need help setting it up?

This page tells you what sponsored-newsletter-finder does and what it needs. Cheetah builds the agent setup it runs inside: data, CRM, sequencing and the guardrails.

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