a two-sided marketplace app for buyers and sellers
PROJECT OVERVIEW
What this app does
This product is a two-sided marketplace app where buyers can discover seller listings, review listing details, place orders, and track their order history. Sellers can create and maintain listings and manage the fulfillment status of incoming orders, while public visitors can browse the catalog before registering.
As an anonymous visitor, I can browse active listings and view listing details
As a buyer, I can register a buyer account
As a buyer, I can browse active listings and view listing details
As a buyer, I can place an order and review my order history
As a seller, I can register a seller account
As a seller, I can create and update my marketplace listings
As a seller, I can review incoming orders and update their fulfillment status
The following user counts are projected totals after one year of growth
1000
anonymous_visitors
Public visitors who browse marketplace listings without a registered account.
8000
buyers
Registered customers who discover listings, place orders, and review their order history.
2000
sellers
Registered suppliers who publish listings and fulfill orders received through the marketplace.
COST BREAKDOWN
How your requirements become a plan and a price
Momen doesn't give a vague quote: it first sizes the project's actual demand for each capability and resource, then costs each item out. The numbers in the 'Project demand' column below — their scale assumptions and derivations — are detailed in Scale & sizing
Minimum viable plan
PRO
Marketplace order purchases require payment capabilities available in PRO.
See the capability-by-capability assessment ▾
PROJECT DEMAND
ALLOWANCE PROVIDED (COMPOSITION)
PRO
x 1
Pro is the minimum viable plan
Pro
(Plan tier: PRO)
See minimum viable plan above
$ 99
single-tenant kit
x 0
1 req/s
not purchased
(plan/kit 25 req/s)
Covered by plan/kit (margin ~2400%)
$ 0
Database storage add-on
x 0
275.91 MB
not purchased
(plan/kit 1.00 GB)
Covered by plan/kit (margin ~262%)
$ 0
Object storage
add-on
x 1
34.32 GB
100GB × 1/year, amortized monthly
(plan/kit 10.00 GB + add-on +24.32 GB)
Add-on fills +24.32 GB gap beyond plan/kit
$ 2.92
Outbound data transfer add-on
x 14
572.44 GB/mo
500GB × 14/year, amortized monthly
(plan/kit 10.00 GB/mo + add-on +562.44 GB/mo)
Add-on fills +562.44 GB/mo gap beyond plan/kit
$ 40.83
AI points add-on
x 0
0 points
not purchased
(plan/kit 5.0M points)
No requirement
$ 0
plan + add-ons · usage-based · no development cost
WHY MOMEN
Your options for this project
In the table below, the 'monthly infrastructure' for the self-built / AI routes is derived from the AWS list prices shown below, sized against this project's actual usage. Figures cover infrastructure and operations only — AI usage is billed separately and excluded here, so they don't match the $142.75/mo all-in above.
Current usage sizing
AWS list pricing
2 × t4g.large × 730h
EC2 t4g.large → 98.11
2 × db.m6g.large (Multi-AZ) × 730h
RDS PostgreSQL db.m6g.large → 232.14
0.28 GB-month
RDS gp3 storage → 0.03
34.32 GB-month
S3 Standard → 0.79
228.64 GB (first 100GB free)
Internet egress → 20.58
Total ≈ $351.65 / mo
Pure cloud resources
DEVELOPMENT COST
MONTHLY CLOUD INFRA ($/MO)
MONTHLY TOTAL (INFRA + OPS, EXCL. AI USAGE)
Traditional outsourcing / build in-house
about $90,000 - $130,000
≈ $352
Based on the AWS estimate above
≈ $2,352
Infra $352 + ops ~$2,000
4-6 months
5 / 5
Vibe Coding
about $18,000 - $24,000
≈ $352
Based on the AWS estimate above
≈ $1,852
Infra $352 + ops ~$1,500
hours
5 / 5
AI full-stack generation
about $8,000 - $10,000
≈ $352
Based on the AWS estimate above
≈ $1,852
Infra $352 + ops ~$1,500
hours
3 / 5
Off-the-shelf SaaS / vertical solution
$0
N/A
Priced per seat, not by cloud infra
≈ $16,000+
Per-seat pricing, tens of thousands of users
days
1 / 5
Momen
Recommended
$0
$143
All-in: egress / storage / auto-scaling; excludes AI usage
$143
hours
5 / 5
Servers, databases, traffic and storage are inherent infrastructure costs for this project — you pay them whether you outsource, use Cursor or Lovable, or build it yourself (self-built runs ≈ $351.65/mo at AWS list prices, often more), on top of the dev and ops staff you'd need to hire. Momen bundles all of it into $0/mo all-in and removes the need for an ops team.
The frontend can be generated with AI tools (Cursor, Lovable, etc.); the hard part is the backend — auth, database, scaling, data security and ops. Momen delivers a production-grade backend as a BaaS: keep the vibe-coding speed on the frontend, while the backend runs on proven infrastructure — reliable, with no self-hosting or ops.
SCALE & SIZING
What scale this estimate assumes, and how the numbers are derived
Cost depends heavily on usage volume. First see the key assumptions and business scenarios this estimate uses, then the full calculation derived from each scenario for every resource — all adjustable to your real situation
We assume a stable registered base of about 10,000 accounts because a two-sided marketplace matches the standard mature scale anchor for an indie marketplace without an explicit user or transaction volume. The total covers buyers and sellers only, while anonymous visitors are tracked separately. If your actual business operations differ, for example if you have a known seller count or daily order volume, this parameter can be adjusted accordingly.
We assume 225 effective accumulation days because a new marketplace commonly follows standard linear growth as buyers, sellers, listings, and orders build gradually over its first year. There is no indication of a full pre-existing dataset or an unusual launch burst. If your actual business operations differ, for example if the marketplace launches with an established seller catalog and user base, this parameter can be adjusted accordingly.
Evening Buyer Shopping
Weekday Seller Operations
Evening Buyer Shopping
Evening Buyer Shopping
30
times/month
0.31 req/s
Peak load
We assume registered purchasing is concentrated into a four-hour evening shopping window but is not synchronized by a sale opening or deadline. This daily scenario isolates the complete purchase path from passive public discovery and repeats 30 times per month. If your actual business operations differ, for example if business buyers transact mainly during office hours, the window and participant allocation can be adjusted accordingly.
Main impact: Peak Concurrency
The scenarios above set the assumptions for each resource; below is the full calculation derived from them. Click to expand each item.
DEVELOPMENT SCOPE
How this app works
What exactly does this budget support? Broken down by business scenario, showing the pages, data tables, automation flows and AI assistant behind each one
Anonymous discovery of marketplace listings without account access.
Account Registration Page
users
Create a marketplace login and linked buyer profile.
Account Registration Page
users
register_buyer
Browse marketplace offers and place an order for a selected listing.
Account Registration Page
users
Review the buyer's existing orders and fulfillment statuses.
Account Registration Page
users
Create a marketplace login and linked seller profile.
Account Registration Page
users
register_buyer
Review the seller catalog, publish a listing, and maintain an existing listing.
Account Registration Page
users
Review incoming orders and advance an order through fulfillment.
Account Registration Page
users
page
data_table
action_flow
Account Registration Page
Registration form that creates either a buyer account or a seller account.
Marketplace Browse Page
Public catalog for discovering active marketplace listings by category.
Listing Detail Page
Detailed listing view where visitors review an offer and registered buyers can order it.
Buyer Orders Page
Private order history for a registered buyer.
Seller Listings Page
Seller workspace for viewing, creating, and editing marketplace listings.
Seller Orders Page
Seller queue for reviewing and fulfilling orders placed against owned listings.
FAQ
What you might want to know about this project
The Q&A below is generated by AI based on this project's type, features and scale
What will drive resource usage for this marketplace?
Which marketplace features are included?
Does this design include online payment processing?
How do listing images affect capacity needs?
Copy to discuss with AI
Challenge & re-estimate
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