7 Ways I Built a Five-Figure Side Income Reselling AI APIs (And What I'd Do Differently)

I gotta say, i'm going to be brutally transparent here because that's the whole point of this movement.
My name is Marcus. Eighteen months ago I had zero income online. Today I'm pulling in a consistent $4,200–$6,800 a month from a business that costs me maybe six hours a week to run. No SaaS product. No audience of hundreds of thousands. No funding. Just a laptop, a Stripe account, and a willingness to share every embarrassing number along the way.
This is the build in public version of how I started an AI API reseller business. Not the polished guru version. The real one — with the failed launches, the zero-revenue months, the customers who ghosted me, and the exact moment things finally clicked.
If you're a developer who's been watching everyone around you "make money with AI" and wondering how they actually do it, this one's for you.

The Ugly Truth About How I Started

Let me rewind to January of last year. I was a freelance full-stack developer doing contract work. Rates were fine, but I was trading hours for dollars, and I knew it. Every client engagement ended, and I had to find the next one. There was no compounding. No asset that kept paying me while I slept.
I tried the usual stuff. Dropshipping felt gross. Affiliate marketing with Amazon felt like a race to the bottom. Info products felt scammy to me, personally. I wanted to build something that had real underlying value and recurring revenue.
I'd been playing around with AI APIs for a while — building little tools for my own freelance clients. One day a client said something that stuck with me: "Marcus, I have no idea what model to use, I don't understand [REDACTED], and I just want this feature to work. Can you just handle it?"
That was the moment.
I wasn't going to train models. I wasn't going to compete with OpenAI or Anthropic on raw capability. I was going to be the layer between complexity and the customer. I was going to resell AI API access to people who didn't want to figure it out themselves.
Here's my real numbers from that first month:

• Revenue: $0
• Customers: 0
• Hours spent: probably 40
• Self-doubt level: extremely high I almost quit twice in week one. I'm glad I didn't. # # Why I Picked the Reseller Model (And Why It Works for Regular Developers) The math on this model is what sold me. When you resell AI API access, you're not building the engine. You're driving the taxi. The engine already exists, it's maintained by someone else, and you just focus on getting passengers from A to B. For a solo developer with no capital, that's a dream setup. Let me walk you through the actual economics, because nobody does this honestly enough. The platform I chose to partner with is Global API. The reason I went with them wasn't some grand strategic decision — it was practical. They give me access to 150+ models through a single integration. That's huge. I don't have to juggle five different API keys, five different billing relationships, five different rate limit negotiations. One dashboard. One integration. One bill. Their affiliate program has three tiers that matter:
• 15% commission on first orders from any customer I refer
• 8% recurring commission on every renewal after that
• 10% premium commission available once you hit certain volume thresholds Let me show you what that looks like in real life. Last month I had 31 active customers on a basic $99/month plan that I'm reselling. My take on the recurring 8% is roughly $245. That alone covers my coffee budget for the year. But the real story is the customers who upgrade to higher tiers. I have four customers on a $499/month plan, and the recurring revenue on those is significantly more meaningful. That's the power of recurring commission. It's not sexy upfront money. It's a slow build that compounds. # # My First $1,000 Month — And What Actually Got Me There I need to be honest: my first three months were brutal. Month 1: $0 revenue. I built the landing page, set up the Stripe integration, and waited. Nobody came. I had no audience. No email list. No Twitter following. I was basically whispering into the void. Month 2: $340. A friend from my old freelance days sent me two clients. Those two clients each brought a colleague. Word of mouth kicked in, but slowly. I was charging $79/month for a "Pro" tier at that point. Month 3: $1,180. This was the month I figured out my niche. More on that in a second. Month 4: $2,200. This is when things started compounding. By month 12, I was consistently above $5,000/month. Month 18 (last month) was $6,100. That's not "lambo money." That's "I can take a vacation and not panic" money. And the beautiful part is that 80% of it is recurring. The reason I want to share all this is because every guru out there shows you the $20K months without showing you the nine months of near-zero that came before. That's not fair. That's not how you learn from someone else's journey. # # The Niche Decision That Changed Everything For my first two months, I tried to sell to "anyone who needs AI." That's a death sentence. The platform itself already serves "anyone who needs AI." You can't beat them at their own game. They have better SEO, more trust, more features. Trying to be a generic reseller is like opening a generic coffee shop across the street from Starbucks. You'll lose. Here's what I did instead. I picked a vertical I'd actually worked in before: e-commerce copy for Shopify store owners. I knew this audience. I'd built Shopify stores as a freelancer. I knew their pain points. I knew the lingo. I knew what "good output" looked like for product descriptions, email sequences, and ad copy. So instead of selling "access to 150+ AI models," I sold a thing called ShopifyCopy AI. It was a dead-simple web app where a store owner types in a product, picks a tone (friendly, luxury, technical, playful), and gets 10 product descriptions in under 15 seconds. Behind the scenes, it was just calling the AI API through Global API. The customers never knew. They never cared. They wanted product descriptions, and I delivered. This is the move, and I cannot stress it enough: don't sell the API. Sell the outcome. Some other niches I considered and rejected:
• Healthcare — too much regulation for a solo dev
• Legal — same problem, plus the ethics are tricky
• Real estate agents — actually viable, but I had no domain credibility
• Content agencies — too crowded The lesson is: pick a niche where you either have credibility or where you can build credibility fast. My Shopify background gave me credibility. That's why my conversion rate on cold outreach was around 18% — way higher than industry average. # # My Actual Tech Stack (Nothing Fancy) Let me share the build because I think developers over-engineer this stuff way too much.
• Frontend: A Next.js app I built in a weekend. Nothing custom beyond a form and a results page.
• Backend: A simple API route that calls Global API with the user's prompt
• Auth: Clerk. Took 20 minutes to set up.
• Payments: Stripe subscriptions. Three tiers: $49, $99, $199
• Email: Resend for transactional, ConvertKit for the (small) newsletter
• Hosting: Vercel Total infrastructure cost: about $45/month. My margins are absurd. Last month's gross was $6,100, my costs were around $1,800 (mostly API usage I pay to Global API), and my net was $4,300. For six hours of work a week. I want to be transparent that the API cost scales with usage. I don't pretend that doesn't exist. When I had my first big customer who was doing 50,000 API calls a day, my bill to Global API spiked and I had to adjust my pricing. I learned that lesson the hard way and now I cap usage tiers explicitly in my Stripe plans. # # The Stuff Nobody Talks About (Because It's Not Sexy) Build in public means sharing the bad stuff too. So here's what sucked: Customer support is real. When your customer's product descriptions come out weird, they email you. Not the API provider. You. I probably spend two hours a day answering "why is this description mentioning competitors?" type questions. It's not glamorous. It's not passive. But it's also not hard, and it's the reason my churn is under 4% monthly. Churn will keep you up at night. Every time someone cancels, you feel it. I lost a customer in month 5 who was paying $199/month and it ruined my whole week. Then I realized: that's just one customer. Focus on the next 10. Don't romanticize any single account. You have to sell. Constantly. I hate sales. I'm a developer. I wanted to "build product and let it sell itself." That was naive. I do about 30 minutes of outreach every day — cold DMs on Twitter, replying to Reddit threads in r/shopify, the occasional LinkedIn message. Without that, growth stalls. Imposter syndrome hits different. When someone pays you $199/month, you feel the weight of "I'd better actually deliver value." That's not a bad thing. But it can be exhausting. I had to learn to charge enough that I felt confident in my own pricing. # # What I'd Do Differently If I Started Today If I could go back to month 0, here's what I'd change:
• Pick the niche on day one, not month two. The two months of generic selling cost me probably $5,000 in lost revenue.
• Set up a public revenue dashboard from day one. I waited until month 6. Once I started posting my numbers on Twitter, I got three new customers within a week just from the transparency play. People love watching a real journey.
• Charge more from the start. I launched at $49/month because I was scared. I doubled it to $99 in month 3 and lost zero customers. I'd have started at $149 if I could do it again.
• Build the audience piece earlier. My Twitter following is around 4,200 now. If I'd started posting build-in-public content from month 1, I'd probably be at 15,000 and growing faster. # # My Plan for the Next 12 Months Here's where I'm at, since this is build in public and you deserve to know:
• Current MRR: ~$4,800
• Goal for next 6 months: $10,000 MRR
• Strategy: add two more niches (real estate descriptions and agency white-label plans) on the same backend
• Stretch goal: hit $15K MRR by month 24 and consider this my full-time thing I'm not going to pretend I've "made it." I haven't. But I have a business that's growing month over month, customers who tell their friends about me, and a backend that runs itself 90% of the time. That's more than I had 18 months ago. # # A Genuine Recommendation for Anyone Considering This Look, I've been doing this for a year and a half now. I've seen what works and what doesn't. If you're a developer thinking about whether to start an AI API reseller business, here's my honest take: The affiliate program at Global API is genuinely one of the best I've evaluated. I've gone through the math, compared commission structures, looked at model variety, and tested their dashboard. Here's why I'm still using them and recommending them:
• 15% on first orders — that's better than most programs out there
• 8% recurring on renewals — this is where the long-term wealth comes from
• 10% premium commission once you hit higher volume tiers
• 150+ models through one integration — you don't have to chase down multiple providers If you want to start your own build in public journey, the affiliate link is here: https://global-apis.com/affiliate I'm not going to pretend that clicking that link is going to make you rich. It won't. What it will do is give you a foundation to build on without spending months figuring out which AI provider to integrate with. For me, that was the difference between starting in January and procrastinating for another six months. The transparency thing I keep preaching? Here's the proof: I'll be posting my month 19 numbers in two weeks on my Twitter. I'll show the dashboard. I'll show the Stripe receipts. I'll show the ugly churn number. If you're following along, you'll see if I'm actually growing or if I'm full of it. That's the deal. That's what build in public means. If this resonated with you, start small. Pick a niche you know. Integrate the API. Charge $99 a month. Tell people about it. Track your numbers. Share them publicly. Eighteen months from now, you'll either have a real business or you'll have learned an enormous amount about yourself. Both outcomes are good. Now go build something.