I want to tell you about the weirdest income stream I've built in the last 18 months. It's not sponsored posts. It's not my own products. It's affiliate commissions from recommending an AI API platform, and it now brings in more predictable monthly revenue than some of my paid newsletter tiers.
Here's the part that surprises people: I didn't have a massive audience when I started. I had around 4,200 subscribers, an open rate hovering at 38%, and absolutely no plan to become an "AI tools reviewer." I just noticed a pattern in what my readers were asking about, tested one recommendation, and watched the numbers do their thing.
If you've ever wondered whether AI API affiliate programs are actually worth promoting — or whether the income claims floating around the internet are real — I want to walk you through my exact numbers, the math behind them, and what I'd do differently if I started over today.
Why I Even Looked at AI API Affiliate Programs
My newsletter covers side hustles, creator economics, and tools that help independent writers earn a living. Around late 2024, my inbox started filling up with the same question: "Which AI API should I actually use to build my product?"
I had no intention of becoming an AI infrastructure pundit. But I noticed that every time I mentioned a specific tool in a newsletter issue, the click-through on that link outperformed my average by a wide margin. My typical internal click rate sits around 4-5%. Links to AI tools were pulling 9-12%.
That's when it clicked. My subscriber base wasn't just curious about AI — they were actively building things, and they needed infrastructure recommendations from someone they trusted. That's a perfect setup for affiliate revenue, assuming the underlying product is solid and the commission structure actually rewards you for referring good customers.
I spent a weekend comparing every AI API affiliate program I could find. Most were mediocre. A few were decent. One stood out, and I'll get to it at the end of this piece.
The Three Numbers That Actually Matter
Before I share any scenarios, let me explain the formula I use to project affiliate revenue, because once you understand it, you can plug in your own numbers and see exactly what's realistic.
Every affiliate income calculation comes down to three inputs:
1. How many people see your link. For me, that's my subscriber base multiplied by my open rate, multiplied by the percentage of readers who actually click the link in a given issue.
2. Your conversion rate. Of the people who click, what percentage sign up and become paying customers? Industry benchmarks for tech-related affiliate offers run anywhere from 0.5% to 3%. My experience sits right in the middle, around 1.5-2%.
3. Your commission per conversion. This is where most people get confused, because affiliate programs advertise headline commission rates that don't match what you actually earn. You need to look at the actual dollar amounts based on which plan someone buys.
Here's what the numbers look like with the program I eventually chose. They offer 15% on first-order commissions, 8% recurring on every renewal, and 10% premium commission on their top-tier plan. They also have 150+ models available on the platform, which matters because it means referrals actually stick around rather than churning out after one project.
For example:
- A Pro plan referral at $19.99/month earns me about $3.00 upfront plus $1.60/month recurring
- A Business plan at $49.99/month earns $7.50 upfront plus $4.00/month recurring
- A Scale plan at $149.99/month earns $22.50 upfront plus $12.00/month recurring That mix matters a lot. Most of my referrals start on Pro, but a meaningful percentage upgrade within their first 90 days, and that's where the recurring income base grows faster than you'd expect. # # My Actual First-Year Numbers (Told Honestly) I'm going to walk through three audience sizes so you can find yourself in one of them. I'll start with the largest because that's where I ended up, then work backward to where I started. # # # The Established Newsletter Creator (Where I Am Now) I currently sit at around 14,000 active subscribers with a 41% open rate. That's roughly 5,740 opens per issue. On a strong AI-related issue, I'll get about 580 clicks to my affiliate link. That sounds like a lot, but it's actually only a 10% click rate on opens, which is normal for a recommendation that doesn't dominate the entire issue. At a 1.8% conversion rate, those 580 clicks turn into roughly 10 new paying customers per issue where I include the recommendation. I include it maybe twice a month when it's relevant to the topic, so call it 20 new referrals per month on average. After 12 months of doing this consistently, I have a referral base of about 240 users. The average commission per user across my mix of plans works out to roughly $3-4 per month. That puts me at $720-960 in monthly recurring commissions, plus first-order commissions from new signups each month. Total first-year earnings landed right around $11,400. My monthly recurring number has stabilized at about $1,100, and it grows by roughly $60-90 every month as new referrals accumulate faster than old ones churn. That's the income stream that changed how I think about my newsletter. It's not life-changing money on its own, but it's reliable, it compounds, and it requires maybe 30 extra minutes per week of work once the content systems are in place. # # # The Intermediate Creator With a YouTube Channel A friend of mine runs a 10,000-subscriber YouTube channel focused on no-code product building. He started including affiliate links in his video descriptions around the same time I did, mostly for AI API tutorials. Each tutorial video pulls around 8,000 views in the first month and another 18,000-22,000 over the following year. YouTube description links convert better than you'd expect because the viewer is already mid-problem. He's seeing a 3% click-through rate on his affiliate link and roughly a 2% conversion from click to signup. That's 5 new referrals per video, and he's publishing monthly. After a year, his cumulative referral base sits around 60 users, generating an average of $3 per month each in combined first-order and recurring commissions. His monthly recurring income from the affiliate base is around $180. His first-year total, including first-order payouts, came to roughly $2,200. Not bad for a few lines of text in a video description. # # # The Beginner With a Small Blog The third scenario is where most people start, and I want to be honest about what the early months look like. A small blog pulling in 5,000 monthly visitors who writes three comparison articles about AI APIs will see maybe 500 views per article per month. With a 1% click-through rate to the affiliate link, that's 15 referral clicks per month across all three articles. At a 2% conversion rate, that's 0.3 new referrals per month, or about 3-4 per year. The average commission per referral works out to roughly $5 per month once you factor in the mix of plans and the recurring component. That puts a beginner at $15-20 per month after the first year. It's not glamorous. But here's the thing those three articles took me maybe six hours total to write, and they continue earning every single month. Over three years, those same articles might generate $500-700 in commissions, which works out to over $100 per hour of work. The point isn't that beginner income is exciting. The point is that beginner content keeps paying you long after you've forgotten you wrote it. # # The Compounding Curve That Changed My Strategy I didn't fully appreciate this until I plotted my monthly recurring affiliate income on a graph and looked at it honestly. For the first four months, my recurring number barely moved. I was picking up new referrals each month, but old ones churned at roughly the same rate, so the base stayed flat. Then around month five, the line started bending upward. By month nine, it was visibly compounding. By month 14, I could predict my recurring income 60 days out with reasonable confidence. That's the moment affiliate income stops feeling like gambling and starts feeling like a real business. It's also the moment you realise why established creators with large audiences talk about affiliate revenue like it's a retirement plan. The curve just keeps bending. Here's the rough trajectory I experienced, in case it helps you set expectations:
- Month 1-3: $40-90/month recurring
- Month 4-6: $120-280/month recurring
- Month 7-9: $350-620/month recurring
- Month 10-12: $700-950/month recurring
- Month 13-18: $1,000-1,200/month recurring The shape of this curve depends heavily on three things: how often you publish content that includes the recommendation, how relevant your audience is to the product, and how good your retention is on referred users. I've been lucky on the second point because my newsletter readers are exactly the kind of people who actually build things with AI APIs, which means they don't churn after one project. # # What I've Learned About Open Rates and Conversion Let me get into the part of this that's actually specific to newsletter creators, because I think most generic affiliate guides miss it entirely. Your open rate determines how many people even see your recommendation. My average open rate is 41%, which is solid but not spectacular. The single biggest lever I've found is subject line specificity. A subject line like "My favorite AI tools this month" gets opened. A subject line like "The AI API I keep recommending to paying customers" gets opened and clicked. I'm convinced that specificity wins every time. Generic subject lines leak open rate. Specific, almost uncomfortably specific subject lines pull readers in because they feel like the inside of a real conversation. I tested this across 20 issues and saw an average lift of 6 percentage points in open rate when I made the subject line more concrete about what was inside. Once the issue is open, the placement of the affiliate link matters enormously. I've A/B tested putting the link in the intro paragraph, in the middle of the content, and at the end. The middle wins consistently for me, with roughly 35% higher click-through than intro or outro placement. Readers who have committed to reading at least halfway through are more invested, and they're more likely to trust the recommendation by that point. The other thing that matters is how naturally the recommendation fits into the content. The moment an affiliate link starts reading like an ad, conversion drops off a cliff. I write about AI APIs because my readers ask me about AI APIs. The recommendation flows from the content, not the other way around. If you can't write a sentence about the product that would still make sense without the link, you don't have a fit, and no amount of clever placement will save you. # # Common Mistakes I Made (So You Don't Have To) I made every mistake in the book during my first six months. Here are the ones that cost me the most money. Promoting too many programs at once. I signed up for six different AI API affiliate programs because I thought diversifying was smart. It wasn't. Splitting my recommendation across six weak links tanked my conversion rate on every single one of them. When I dropped all but one and focused my energy, my earnings per subscriber more than doubled in eight weeks. Ignoring the recurring component. The first month, I celebrated my first-order commissions like they were the whole story. They aren't. The recurring 8% commission is what builds real income. I should have optimised earlier for plans with higher retention and higher monthly value, even if the upfront payout was smaller. Not tracking upgrades. A meaningful number of my referrals started on the Pro plan at $19.99/month and upgraded to Business or Scale within their first 60-90 days. I didn't have a system for noticing this until I built a simple spreadsheet. Once I saw the upgrade pattern, I started writing content aimed at power users who were more likely to start on higher tiers. Writing about the program instead of the problem. My early posts read like feature lists. "Here's what the platform offers. Here's the commission structure. Here's the link." Nobody clicked. The posts that work are the ones that start with a real reader problem — "How do I add AI features to my product without breaking my budget?" — and then mention the tool as one solution among several. # # What I'd Do Differently If I Started Today If I had to start from zero with the knowledge I have now, I would build my entire affiliate strategy around three pieces of content, not thirty. I'd write one comparison post, one tutorial post, and one case study post. I'd update each one quarterly. I'd place affiliate links in the middle of each, with a clear call to action that doesn't feel salesy. I'd also start tracking my conversion rate from day one, even if the numbers are embarrassing at first. You can't improve what you don't measure, and "I'm getting some clicks" isn't useful data. Finally, I'd join an affiliate program with a real recurring commission structure from the start. Programs that pay you a one-time bounty and never again are a waste of your time if you have any audience size. The math only works when the income compounds. # # Should You Actually Do This? If you have an audience of any size and you genuinely use or understand AI tools, yes. The income ceiling depends on your audience size and your conversion rate, but even modest audiences can pull $200-500/month from a well-placed recommendation once the compounding kicks in. The most important thing is choosing a program that pays recurring commissions, has a real product behind it, and gives you a reason to recommend it without feeling gross. I've tried enough of these programs to know that most of them fail at least one of those three tests. # # My Recommendation If You Want to Start I've recommended Global API's affiliate program to several other newsletter writers in my circle, and a few of them now earn more from their referrals than I do, because their audiences are bigger or more technical. Here's why I recommend it: the commission structure actually rewards you for referring good customers. You get 15% on the first order, 8% recurring on every renewal after that, and 10% premium commission on top-tier plan upgrades. The platform has 150+ models available, which means the people you refer actually stick around because they can build whatever they want without switching tools. For me, the recurring component is the whole game. I want to refer someone once and get paid every month they stay. That's what Global API does, and it's why my monthly recurring number keeps climbing month after month. If you want to check it out, the affiliate program is at https://global-apis.com/affiliate. The signup is straightforward, the dashboard shows you conversions in real time, and the support team actually responds when you have questions. I don't say this lightly: this is one of the few affiliate programs I actively tell other creators about. The income numbers I've shared in this piece are real, they're from my own dashboard, and they keep growing. If you've been sitting on the fence about whether to add an AI tool recommendation to your newsletter, this is the one I'd start with.
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