The indie hacker's guide to building SEO directories

Directories are underrated

While everyone chases AI wrappers and SaaS products, niche directories quietly print money through organic traffic. GoSolarIndex.in and MSMEVault.in both generate leads with zero ad spend.

The formula

1. Pick a niche with search demand, use Google Keyword Planner to find niches where people search for "[category] in [location]" or "[thing] directory"
2. Build with Next.js, server-rendered pages, dynamic sitemaps, structured data
3. Programmatic pages at scale, one template, hundreds of unique pages
4. Monetize with leads, collect inquiries, sell to service providers, or run affiliate partnerships

Step 1: Find the niche

The best directory niches have:

• High search volume for "[category] in [city]" queries
• Fragmented supply (many small providers, no dominant platform)
• Commercial intent (people searching are ready to buy)

Solar installers in India? Perfect. 10,000+ monthly searches, hundreds of small installers, no dominant directory.

Step 2: Build the data layer

model Listing {
  id          String   @id @default(cuid())
  name        String
  slug        String   @unique
  category    String
  city        String
  state       String
  description String?
  phone       String?
  website     String?
  rating      Float?
  verified    Boolean  @default(false)
  createdAt   DateTime @default(now())
 
  @@index([city, category])
  @@index([state, category])
}

Seed data from public sources, government registries, professional associations, public databases. Enrich with Google Places API if budget allows.

Step 3: Programmatic pages

Every city × category combination gets a unique page:

// app/[category]/[city]/page.tsx
export async function generateStaticParams() {
  const combos = await db.listing.findMany({
    select: { category: true, city: true },
    distinct: ["category", "city"],
  });
  return combos.map((c) => ({
    category: slugify(c.category),
    city: slugify(c.city),
  }));
}

Each page has unique content: city-specific intro text, listing cards, FAQ section with local keywords, structured data for each listing.

Step 4: Monetize

Three models that work:

1. Lead generation, contact forms on listings, sell inquiries to providers ($5-50 per lead)
2. Featured listings, charge providers for top placement ($50-200/month)
3. Affiliate, link to related services (financing, insurance) with affiliate codes

MSMEVault.in uses model #1, NBFC partners pay per qualified loan inquiry.

The numbers

GoSolarIndex.in:

• Built in 3 days
• 500+ pages indexed in 2 weeks
• Page 1 rankings in under a month
• Cost: domain registration + Vercel free tier

The ROI on directory sites is absurd if you pick the right niche and execute on technical SEO.

Start this weekend

You can build and launch a directory in a weekend with Next.js, PostgreSQL, and the patterns I've described. The hardest part isn't the code, it's picking the niche. But once you find a good one, the organic traffic compounds.

Need help building a directory or lead-generation site? Let's talk.