Kishan ,
During my yesterday’s chat with RO.app , it mentioned some monthly cost estimates. Just now, I asked it to clarify through a break up. Here is that answer :
[ Kishan > I suppose , you can calculate “ Estimated Income ( @ Rs 20 per document generated ) “ for those different “ Monthly User Activity Levels “ . ]
Thought for 2s
Excellent question, Hemen Bhai! Let me break down the detailed cost estimation for 500 daily active users:
Cost Breakdown for 500 DAU (Daily Active Users):
1. WhatsApp Business API
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· Per message cost: $0.0079 per template message (India pricing)
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· Daily alerts: 500 users × 1 alert/day = 500 messages/day
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· Monthly: 500 × 30 × $0.0079 = $118.50/month
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· Note: Only charged for messages sent OUT, not received
2. LLM API (Document Generation)
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· Average document: ~500 tokens to generate
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· API cost (using Vercel AI Gateway/Claude): ~$0.003 per 1K tokens
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· Avg cost per document: 500 tokens × ($0.003/1K) = $0.0015
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· Users generating 1 doc/day average: 250 documents/day
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· Monthly: 250 × 30 × $0.0015 = $11.25/month
·
·
· Note: Some users will generate more, some less. This is conservative.
3. Firebase Cloud Messaging (Push Notifications)
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· Free tier: 100K messages/month included
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· At 500 DAU, 1 notification/day: 500 × 30 = 15K/month
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· Cost: FREE (within free tier)
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· Only pays if exceeds 100K/month
4. Google Trends API / News API
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· NewsAPI (for trending topics): $0 for 100 requests/day (free tier)
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· Or: $99/month for higher volume if needed
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· Cost: $0-99/month (using free tier initially)
5. Database Hosting (PostgreSQL)
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· Neon Serverless PostgreSQL: Starting at $0.16/day
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· OR Supabase: $25/month starter plan
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· Estimated usage (500 DAU): ~100 MB data
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· Cost: $25-50/month
6. Server/Backend Hosting
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· Vercel (Next.js backend):
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· Free tier: 100 GB bandwidth/month
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· At 500 DAU, ~50-100 GB/month = within free
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· If paid: $20/month minimum
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· OR AWS Lambda: Pay per invocation ($0.20 per 1M requests)
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· Estimated: $10-30/month
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· Cost: $0-30/month (free tier sufficient)
7. Analytics & Monitoring
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· Sentry (error tracking): Free tier
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· Vercel Analytics: Free
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· Cost: $0/month
8. SMS Verification (Phone OTP)
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· Twilio: $0.0075 per SMS in India
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· Estimated: 10% of DAU need re-verification = 50 messages/month
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· Cost: 50 × $0.0075 = $0.375/month
9. Storage (Generated Documents, Images)
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· Vercel Blob: $0.50 per GB stored
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· Estimated: 500 DAU × 10 docs × 0.5 MB avg = 2.5 GB/month
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· Cost: 2.5 × $0.50 = $1.25/month
Total Monthly Cost Breakdown:
Service | Cost |
WhatsApp API | $118.50 |
LLM Document Generation | $11.25 |
Firebase Notifications | $0 |
News API | $0 |
Database (PostgreSQL) | $25-50 |
Server/Backend Hosting | $0-30 |
SMS Verification | $0.375 |
Storage (Blob) | $1.25 |
SUBTOTAL | $156.40 - $211.40 |
Contingency (20%) | $31 - $42 |
TOTAL (Conservative) | ~$200-250/month |
Why I Said $500-1000?
I included buffer for:
1.
2. Scaling Safety (2-3x growth): If you hit 1,000-1,500 DAU unexpectedly
3.
4. Premium Services: Upgraded Google Trends, better LLM models
5.
6. Infrastructure redundancy: Backup databases, failover systems
7.
8. Team salary allocation: Part of a developer's time for maintenance
9.
10. Unexpected costs: Emergency scaling, API rate limit overages
More Realistic Estimate for 500 DAU:
Tier | Cost | Details |
Minimum (Lean) | $150-200 | Free tiers, basic services |
Standard (Recommended) | $250-400 | Reliable infrastructure |
Premium (Safe) | $500-800 | Redundancy, backups, monitoring |
Enterprise (Growth) | $1000+ | Multiple regions, dedicated support |
As You Scale (Revised Estimates):
Users | Monthly Cost |
500 | $200-300 |
1,000 | $300-500 |
5,000 | $600-1,200 |
10,000+ | $1,500-3,000+ |
My Recommendation for Kishan:
Start with $250-300/month budget to cover:
· WhatsApp API ($120)
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· Database ($50)
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· Hosting ($20-30)
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· LLM generation ($10-15)
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· Buffer ($50)
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This is realistic and sustainable for 500 DAU with room for growth.
Does this breakdown help clarify the calculation, Hemen Bhai?
Worked for 21s
I continued but ran out of FREE CREDITS – hence no reply / but I am sure you can calculate to see if this could be a profitable operation :
I asked :
Hey Bro : That was very detailed and precise , with clear cut " Assumptions " of DAU. Now I wonder if you can also help me figure out " Monthly Income " ( for 500 DAU ) if I were to charge Rs 20 for each document generated . Pl compute all figures in Rupees and show the MARGIN ( Income minus Expenses ) in a tabulation
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