Newsletter Sponsor Tracker

v1.0.0$0.004/sponsor rowSignal Detection

Last updated October 25, 2026

Find who sponsors a newsletter, or which newsletters a brand sponsors. Reads public Substack, beehiiv, and other newsletter archives for sponsor placements and returns one row per sponsor with domain, placements, first and last issue seen, and issue links. For ad sales and sponsor research.

Install

bash
npx @mambalabsdev/mcp-newsletter-sponsor-tracker

Every tool here also runs hosted, with no install at all, through Apify's MCP endpoint.

Features

  • Find who sponsors a newsletter, or which newsletters a brand sponsors.
  • Reads public Substack, beehiiv, and other newsletter archives for sponsor placements and returns one row per sponsor with domain, placements, first and last issue seen, and issue links.
  • For ad sales and sponsor research.
  • Pay per event: Sponsor row at $0.004.
  • Pay per event: Brand search at $0.065.

Input

modestringoptional

Mode. newsletter: newsletter links in, sponsors out. brand: a brand in, the newsletters that ran its sponsor placements out.

newsletter_urlsarrayoptional

Newsletter links. Newsletter mode. Home page links or domains of Substack, beehiiv, or other hosted newsletters, up to 100, for example notboring.co or newsletter.pragmaticengineer.com.

brand_namestringoptional

Brand name. Brand mode. The sponsor name as newsletters print it, for example Attio.

brand_domainstringoptional

Brand domain. Brand mode. The sponsor's domain, for example attio.com. A placement counts when its link goes to this domain or its name equals the brand name.

newsletters_to_checkstringoptional

Newsletters to check (brand mode). Brand mode. Candidate newsletters found in Google results whose issues are read to confirm the placement, 1 to 10.

issues_to_scanstringoptional

Issues per newsletter. Newest issues read per newsletter, 1 to 200 in newsletter mode and at most 20 in brand mode.

since_daysstringoptional

Only issues from the last (days). Stop at issues older than this many days. 0: no date limit.

max_charge_usdstringoptional

Max charge per run (USD). Stop before a row would push this run past this amount. Empty: no limit beyond the one you set in Apify.

Output schema

json
{
  "row_type": "string",
  "mode": "string",
  "input_key": "string",
  "newsletter_name": "string",
  "newsletter_url": "string",
  "platform": "string",
  "sponsor_name": "string",
  "sponsor_domain": "string",
  "sponsor_url": "string",
  "placement_labels": "array",
  "placements": "integer",
  "issues_scanned": "integer",
  "share_of_issues_pct": "integer",
  "first_seen_at": "string",
  "last_seen_at": "string",
  "issue_urls": "array",
  "issue_titles": "array",
  "sponsored_issues": "null",
  "sponsor_count": "null",
  "sponsors_list": "null",
  "oldest_issue_at": "null",
  "newest_issue_at": "null",
  "brand_name": "null",
  "brand_domain": "null",
  "found_via": "string",
  "newsletters_checked": "null",
  "newsletters_found": "null",
  "row_status": "string",
  "error_reason": "null",
  "billable_events_json": "string",
  "checked_at": "string"
}

Pricing

$0.004per sponsor row

Pay-per-event billing on the Apify platform. You are charged only when the actor returns a result. No subscription, no seat license.

Free-tier Apify accounts include monthly free compute. Upgrade for higher concurrency and volume.