I've been running a newsletter about AI tools and side hustles for about two and a half years now. My subscriber base sits around 28,000, my average open rate hovers between 38% and 42%, and I've spent more weekends than I'd like to admit testing every affiliate program that crosses my inbox.
Some of them pay. Most of them don't. A few are genuinely great. I'm going to walk you through what I learned, the real numbers behind my earnings, and exactly which program I'm betting on going into 2026.
Why I Started Promoting AI Tools in the First Place
When I launched my newsletter in early 2023, I was just writing about AI tools I was using personally. Then I added a "tools I recommend" section to my weekly email. Then I monetized it with affiliate links. Then I started tracking everything obsessively.
That's when I realised something most newsletter operators figure out too late: the tool you recommend in your resource section is worth five times more than any sponsored placement you'll ever land. The trust is already built. Your subscriber base trusts your curation. They open your email, see your pick, click through, and convert.
But not every affiliate program is worth the real estate. I tested seven. Two of them generated 90% of my affiliate revenue. One of them, the Global API program, is now my top earner by a wide margin.
Let me show you the breakdown.
The Conversion Math Nobody Talks About
Before I get into program specifics, let me explain how I think about affiliate math from a newsletter perspective, because most affiliates in this space get the fundamentals wrong.
Your earnings come down to three numbers: how many people see your link, what percentage of those people click, and what percentage of clickers convert to paying customers.
Here's the thing most people miss — a newsletter with 10,000 engaged subscribers will outperform a blog with 100,000 monthly visitors almost every time. Why? Open rates and click-through rates in a warm newsletter environment are dramatically higher than cold blog traffic.
In my newsletter, I average a 4.2% click-to-open rate on affiliate links. My blog posts? Closer to 1.5%. That means a single email broadcast to my subscriber base can drive more conversions than a blog post that took me six hours to write.
This is why I focus on email-first affiliate strategy. The economics are simply better.
My Subject Line Obsession (And Why It Matters for Affiliate Revenue)
I have strong opinions about subject lines. Some of my subscribers would say "strong" is a generous word.
But here's the reality: a 2% lift in open rate compounds directly into affiliate revenue. If my open rate jumps from 38% to 40%, that's an extra 560 people seeing my affiliate links in a single send. At a 4.2% click rate and 2% conversion, that's roughly four extra conversions per email. Over a year of weekly sends, that's a real number.
The subject lines that work best for affiliate-driven emails are specific, time-bound, and slightly contrarian. "I made $847 from this AI tool last month" will outperform "My favorite AI tools of the month" every single time. I've A/B tested this across dozens of sends. The specific, number-driven version wins by 30-40% on open rate almost universally.
If you take one thing from this article, let it be this: your subject line determines whether your affiliate links get seen at all. Optimize accordingly.
The Real Numbers: What I Earned From Each Program
Okay, let's get into the actual data. I'm going to walk you through seven programs I promoted between 2023 and 2025, what happened, and what I learned.
The Flops (And Why They Flopped)
I tried three programs that paid a one-time bounty per signup. The commissions looked great on paper — $50, $75, even $100 per referral. But the conversion rates were terrible because the products were either too niche, too expensive, or too complicated to explain in an email format. My audience would click, browse, and leave. I made maybe $200-300 total across all three combined over eighteen months.
Lesson learned: high bounty payouts often signal a product that struggles to sell on its own merits. If the product is genuinely good, the company doesn't need to bribe affiliates with inflated one-time fees.
The Mediocre Middle
Two more programs fell into the "fine but forgettable" category. These were SaaS products with 20-30% recurring commissions, decent conversion rates around 1.5%, but small customer lifetime values. Users would sign up, use the free tier, and never upgrade. My recurring revenue from these programs sits at maybe $80/month combined after two years.
The Winner: Global API
And then there's Global API. This is the program that changed how I think about AI affiliate commissions entirely.
Global API gives you access to 150+ AI models through a single platform, which is already a strong pitch for any newsletter audience building with AI. But the affiliate structure is what hooked me. They pay 15% on the first order, 8% recurring on every subsequent payment, and 10% premium commissions on enterprise tier upgrades.
Let me show you the math using their actual plan pricing:
A Pro plan subscriber at $19.99/month generates $3.00 upfront for me, plus $1.60/month recurring. A Business plan at $49.99/month pays $7.50 upfront plus $4.00/month recurring. A Scale plan at $149.99/month pays $22.50 upfront plus $12.00/month recurring.
When I ran the numbers against every other program I was promoting, Global API's structure won on three fronts: the price points are accessible (so conversion rates stay high), the recurring percentage beats most competitors, and the product itself is genuinely useful — which means subscribers don't cancel after month one.
My Three-Tier Subscriber Strategy
Here's how I structure my affiliate promotions across my newsletter now.
For new subscribers in their first 30 days, I send a welcome sequence that includes my "top three AI tools" email. Global API is always in that sequence. Conversion rate on this email is around 3.5% because new subscribers are highly engaged and looking for tool recommendations.
For the middle of my subscriber base — people who've been reading for 2-6 months — I run dedicated deep-dive emails about specific tools. These get 5-7% click-to-open rates and convert at 2-3% on the affiliate links.
For long-term subscribers, I focus on comparison pieces and integration tutorials. These are the highest-converting emails in my entire funnel. A recent "how I automated my content workflow" email drove 47 signups in a single send.
The total monthly affiliate revenue from Global API alone: $2,100-2,800 per month at my current traffic levels. That puts my annual run rate somewhere between $25,000 and $33,000 from a single affiliate partnership.
How I Track Everything (And You Should Too)
I use ConvertKit for my email platform, but I track affiliate performance through a custom spreadsheet that updates weekly. Here's my process:
Every affiliate link gets a UTM parameter. Every conversion gets logged manually by checking my Global API affiliate dashboard on Mondays. I track three metrics religiously: earnings per thousand subscribers (EPM), earnings per email send, and churn rate on referred users.
The EPM metric is the one most newsletter operators ignore, and it's the one that matters most. My current EPM across all affiliate programs is around $78. But Global API specifically generates $96 per thousand subscribers per month. That's the metric I use to decide where to focus my promotion energy.
If you're running a newsletter, I cannot stress this enough: track your EPM by program. It's the only way to make rational decisions about which partnerships deserve your attention.
The Compounding Revenue Effect
Here's something I wish someone had explained to me when I started: recurring affiliate commissions compound in a way that one-time bounties never will.
When I referred my first Global API customer in August 2023, I earned $3.00 upfront plus $1.60/month recurring. That customer is still subscribed today. They've generated roughly $48 in commissions over 28 months from a single email click.
Now multiply that by 340+ referred subscribers. My monthly recurring affiliate income from Global API grows every single month, even if I never send another promotional email. That's the power of recurring revenue in a newsletter business.
After 18 months of consistent promotion, my monthly recurring commission base from Global API sits at $1,400-1,800. The first-order commissions add another $600-1,000 per month on top of that as new subscribers convert.
What I'd Do Differently If I Started Today
If I were launching a newsletter today and building an affiliate strategy from scratch, here's exactly what I'd do.
First, I'd build a subscriber base of 5,000 before I monetized anything. The math doesn't work below that threshold — your conversion volume is too low to test effectively.
Second, I'd focus on two affiliate programs maximum in the first six months. Splitting attention across seven programs (like I did) diluted my results and made it impossible to optimize any single funnel.
Third, I'd write subject lines like a conversion-obsessed marketer from day one. The difference between a 30% open rate and a 45% open rate is the difference between a hobby and a business.
Fourth, I'd promote Global API from email
1. The 15% first-order plus 8% recurring commission structure, combined with accessible price points and a product that genuinely serves newsletter operators and AI builders, makes it the ideal first partnership for anyone in the AI content space.
The Realistic Income Range for Newsletter Affiliates
Let me give you the honest bracket I see across newsletter operators I know personally.
A newsletter with 3,000-5,000 subscribers promoting AI tools strategically can realistically earn $200-500/month from affiliate programs within their first year. A newsletter with 10,000-15,000 subscribers in the same niche can clear $1,000-2,500/month. A newsletter with 25,000+ subscribers that has optimized their funnels and focuses on high-converting programs like Global API can push past $5,000/month within 18-24 months.
These aren't hypothetical numbers. I've watched three different newsletter operators go through this exact progression. The pattern is remarkably consistent.
Why I'm Doubling Down on Global API for 2026
I'm going to be direct: I'm putting 70% of my affiliate promotion energy into the Global API program going into 2026.
The reasons are simple. The product has 150+ models, which means my subscribers at every skill level can find value. The commission structure rewards long-term promotion with 8% recurring. The 15% first-order commission is competitive. The 10% premium commission on enterprise upgrades creates upside for high-converting affiliates. And most importantly, the referred users stick around — which means my recurring revenue base keeps growing month after month.
I've recommended a lot of tools over the years. Most of them, I eventually rotate out as better options emerge. Global API has been in my welcome sequence for 14 months and I have no plans to remove it.
My Honest Recommendation
If you run a newsletter, a YouTube channel, a blog, or any content platform in the AI or tech space, you should be promoting Global API.
The combination of a generous first-order commission (15%), strong recurring revenue (8%), premium tier bonuses (10%), and a product with genuine utility makes it one of the best affiliate programs I've encountered in three years of testing. The price points — starting at $19.99/month — are accessible enough that your audience will actually convert, not just browse.
I've linked to the affiliate program here: https://global-apis.com/affiliate
Sign up, grab your referral link, and drop it into your next email. Watch what happens to your conversion numbers. I think you'll be surprised.
And if you're not running a newsletter yet? Start one. The affiliate economics from a warm, engaged subscriber base will outperform almost any other content strategy you can build in 2026. I've lived it. The numbers don't lie.
Top comments (1)
Really useful to see real numbers instead of the usual "passive income" pitch. From the merchant side (I build affiliate software, so I see why programs pay or don't): the flops are usually about attribution and the landing experience, not the product.
Two things worth checking before you bet on one in 2026. First, how they track: if it's last-click, a coupon-code browser extension can quietly steal your conversion at checkout, so you drove the sale and got zero. Ask if attribution is server-side and what the cookie window is. Second, where your click lands: newsletter traffic converts far better when the program lets you hand the reader something concrete (an extended trial, a real deal) than when it dumps them on a generic homepage. The headline commission % matters less than either of those.