a marketplace app for buyers and sellers
PROJECT OVERVIEW
What this app does
This project is a two-sided marketplace app where public visitors and registered buyers can browse product listings, view product details, place orders, complete payment, and review order status. Sellers can create and maintain listings and fulfill incoming orders, while administrators review listings before publication. The MVP focuses on the core listing-to-purchase lifecycle without adding unstated marketplace extensions such as reviews, messaging, or promotions.
As an anonymous visitor, I can browse public product listings and view product details
As a buyer, I can browse available products and view a selected listing
As a buyer, I can place an order and complete payment for a product
As a buyer, I can review my previous orders and their statuses
As a seller, I can create and update my product listings
As a seller, I can review incoming orders and update their fulfillment status
As an administrator, I can review pending listings and approve or reject them
The following user counts are projected totals after one year of growth
1000
anonymous_visitors
Public visitors who browse available marketplace products without a registered account.
8500
buyers
Registered customers who browse products, place orders, pay, and review purchase history.
1450
sellers
Registered marketplace suppliers who create listings and fulfill buyer orders.
50
administrators
Internal staff who review marketplace listings and maintain publication standards.
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
The marketplace requires buyer payment collection, which requires at least the PRO plan.
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
373.40 MB
not purchased
(plan/kit 1.00 GB)
Covered by plan/kit (margin ~168%)
$ 0
Object storage
add-on
x 1
12.84 GB
100GB × 1/year, amortized monthly
(plan/kit 10.00 GB + add-on +2.84 GB)
Add-on fills +2.84 GB gap beyond plan/kit
$ 2.92
Outbound data transfer add-on
x 5
177.52 GB/mo
500GB × 5/year, amortized monthly
(plan/kit 10.00 GB/mo + add-on +167.52 GB/mo)
Add-on fills +167.52 GB/mo gap beyond plan/kit
$ 14.58
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 $116.5/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
0.37 GB-month
RDS gp3 storage → 0.04
12.84 GB-month
S3 Standard → 0.3
1.91 GB (first 100GB free)
Internet egress → 0.17
Total ≈ $330.76 / mo
Pure cloud resources
DEVELOPMENT COST
MONTHLY CLOUD INFRA ($/MO)
MONTHLY TOTAL (INFRA + OPS, EXCL. AI USAGE)
Traditional outsourcing / build in-house
about $95,000 - $145,000
≈ $331
Based on the AWS estimate above
≈ $2,331
Infra $331 + ops ~$2,000
4-6 months
5 / 5
Vibe Coding
about $18,000 - $25,000
≈ $331
Based on the AWS estimate above
≈ $1,831
Infra $331 + ops ~$1,500
hours
5 / 5
AI full-stack generation
about $8,000 - $11,000
≈ $331
Based on the AWS estimate above
≈ $1,831
Infra $331 + 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
$117
All-in: egress / storage / auto-scaling; excludes AI usage
$117
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 ≈ $330.76/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 10,000 registered accounts because a two-sided marketplace with no explicit user or transaction volume matches the standard mature marketplace anchor. This represents buyers, sellers, and a small internal administrator pool, while anonymous visitors are counted separately; if actual seller acquisition or transaction throughput differs, this parameter can be adjusted accordingly.
We assume 225 equivalent accumulation days because a new marketplace typically follows standard linear growth as buyers, sellers, listings, and orders build over its first year. There is no indication of a launch with a full pre-existing dataset or a sudden recent traffic burst; if the marketplace imports an established catalog and order history, this parameter can be adjusted accordingly.
Daily Customer Activity
Weekday Seller Operations
Daily Customer Activity
Daily Customer Activity
30
times/month
0.5 req/s
Peak load
We assume public discovery, buyer checkout, and order-status review overlap within a four-hour daily customer period because consumer marketplace activity is commonly strongest from late afternoon through evening but is not synchronized by a single external signal. The purposes are separated because browsing, purchasing, and reviewing existing orders have different participant scales and intended actions. A 14,400-second window represents this broad demand period, and 30 occurrences represent daily operation. If the marketplace serves a business audience or runs time-limited sales, the window and frequency can be adjusted accordingly.
Main impact: AI Points
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
Public discovery path from the catalog to individual listings.
Marketplace Home Page
users
Registered buyer path from product discovery through payment checkout.
Marketplace Home Page
users
create_order_checkout
Buyer review of previous purchases and current order statuses.
Marketplace Home Page
users
Seller path for reviewing, creating, and editing product listings.
Marketplace Home Page
users
Seller review and fulfillment of paid marketplace orders.
Marketplace Home Page
users
Administrator review and approval or rejection of pending listings.
Marketplace Home Page
users
page
data_table
action_flow
Marketplace Home Page
Public catalog for discovering available marketplace listings.
Product Detail Page
Listing detail and direct purchase entry for a selected product.
Buyer Orders Page
Private purchase history and status tracking for buyers.
Seller Product Management Page
Seller workspace for creating and maintaining marketplace listings.
Seller Order Management Page
Seller queue for reviewing and fulfilling paid orders.
Listing Moderation Page
Administrator queue for reviewing and deciding whether listings can be published.
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?
How do product images affect the required plan?
Does payment processing affect backend usage?
Copy to discuss with AI
Challenge & re-estimate
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