Email marketing made simple, affordable, and automation-ready
Newsletter sponsorship platform connecting brands with publishers
Stage
Startup
Not given
Founded
Not given
Not given
Based in
Not given
Not given
Pricing model
Paid
Freemium
Pricing
Not given
Free to join for both brands and newsletters. Brands pay the sponsorship price only after a newsletter accepts. LetterBid keeps 25% of each sponsorship as fee (includes payment processing); newsletters receive 75%.
Key features
Campaign editor with slash commands for formatting
Scheduled sending with timezone selection
Open and click analytics
Customizable email themes with colors and fonts
Newsletter website for each issue
Signup forms and embed script
List import from Substack, beehiiv and Mailchimp
SPF, DKIM and DMARC authentication
One-click unsubscribe links
API and MCP server for AI agent integration
Newsletter discovery with verified audience data
Three sponsorship placement types: dedicated email, sponsored ad, banner ad
Direct, multi-newsletter, and recurring campaign types
Custom offer negotiation with up to 3 counter offers
Payment held in escrow until delivery approval
Verified newsletter badges with audience verification
Delivery reports and brand approval process
Public storefront for newsletters with shareable booking link
Stripe integration for payouts on the 15th of each month
Dispute resolution with LetterBid team intervention
What makes it different
Pay per email sent, not per subscriber
Every feature on all plans with no add-ons
Built for AI agents with full API access
Simple interface designed to be learned in one sitting
Deliverability features on every plan by default
Transparent, fixed pricing with no hidden fees or surprise charges
Payment held in escrow and released only after delivery proof and brand approval
Verified audience data for newsletters to reduce guesswork
No upfront payment required; brands pay only after newsletter acceptance
Dispute resolution system with fair split option if sides cannot agree
StalkMail
LetterBid