a two-sided marketplace app for buyers and sellers
PROJECT OVERVIEW
What this app does
This marketplace app connects buyers with sellers through a shared catalog of listings. Visitors can browse listing details, registered buyers can place and review orders, and sellers can create listings with images, maintain their catalog, and fulfill incoming orders. The MVP includes hosted payment initiation and payment-status confirmation for marketplace purchases.
As an anonymous visitor, I can browse listings and view listing details without signing in
As a buyer, I can search listings and view listing details before purchasing
As a buyer, I can place an order and begin payment for an available listing
As a buyer, I can review my orders and their current statuses
As a seller, I can create a marketplace listing with an image gallery
As a seller, I can review and update my marketplace listings
As a seller, I can review incoming orders and mark them as fulfilled
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.
9000
buyers
Registered customers who browse listings, place orders, and review their purchases.
1000
sellers
Registered providers who publish listings and fulfill marketplace orders.
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 purchases require 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
388.50 MB
not purchased
(plan/kit 1.00 GB)
Covered by plan/kit (margin ~157%)
$ 0
Object storage
add-on
x 0
3.03 GB
not purchased
(plan/kit 10.00 GB)
Covered by plan/kit (margin ~230%)
$ 0
Outbound data transfer add-on
x 13
544.67 GB/mo
500GB × 13/year, amortized monthly
(plan/kit 10.00 GB/mo + add-on +534.67 GB/mo)
Add-on fills +534.67 GB/mo gap beyond plan/kit
$ 37.92
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 $136.92/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
0.39 GB-month
RDS gp3 storage → 0.04
3.03 GB-month
S3 Standard → 0.07
212.70 GB (first 100GB free)
Internet egress → 19.14
Total ≈ $349.51 / mo
Pure cloud resources
DEVELOPMENT COST
MONTHLY CLOUD INFRA ($/MO)
MONTHLY TOTAL (INFRA + OPS, EXCL. AI USAGE)
Traditional outsourcing / build in-house
about $110,000 - $160,000
≈ $350
Based on the AWS estimate above
≈ $2,350
Infra $350 + ops ~$2,000
4-6 months
5 / 5
Vibe Coding
about $18,000 - $25,000
≈ $350
Based on the AWS estimate above
≈ $1,850
Infra $350 + ops ~$1,500
hours
5 / 5
AI full-stack generation
about $8,000 - $10,500
≈ $350
Based on the AWS estimate above
≈ $1,850
Infra $350 + 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
$137
All-in: egress / storage / auto-scaling; excludes AI usage
$137
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 ≈ $349.51/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 without an explicit user or transaction figure uses the typical mature marketplace anchor for an indie or no-code product. This represents buyers and sellers only, while public visitors are tracked separately. If your actual business operations differ, for example if you have known seller, buyer, or transaction volumes, this parameter can be adjusted accordingly.
We assume 225 effective accumulation days because a new marketplace normally grows its buyer, seller, listing, and order records progressively rather than launching with a full pre-existing dataset. This follows the standard linear-growth pattern for a mature first year. If your actual business operations differ, for example if you are launching with an established catalog and historical orders, this parameter can be adjusted accordingly.
Daily Buyer Order Review
Daily Buyer Purchase Window
Daily Buyer Purchase Window
Daily Buyer Purchase Window
30
times/month
0.5 req/s
Peak load
We assume order-status review forms a separate four-hour daily scenario because it serves post-purchase monitoring rather than catalog discovery or checkout. Buyers arrive independently during common after-work service hours, so the full period is used rather than a narrow burst. The only purpose is reviewing existing orders. If order checks are distributed uniformly throughout the day, the duration can be widened 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 of marketplace inventory without signing in.
Marketplace Browse Page
users
Registered buyer discovery and purchase initiation.
Marketplace Browse Page
users
create_marketplace_listing
Buyer review of previously placed orders and current statuses.
Marketplace Browse Page
users
Seller creation of a new marketplace listing and image gallery.
Marketplace Browse Page
users
create_marketplace_listing
Seller review and update of an existing listing.
Marketplace Browse Page
users
Seller review and completion of a paid marketplace order.
Marketplace Browse Page
users
page
data_table
action_flow
Marketplace Browse Page
Public catalog for finding active marketplace listings.
Listing Detail Page
Detailed listing page with gallery, seller details, availability, and checkout entry.
Buyer Orders Page
Buyer-facing history of placed orders and their current status.
Seller Listings Page
Seller workspace for reviewing and selecting marketplace listings to manage.
Listing Editor Page
Seller form for creating listings with images and editing existing listing details.
Seller Orders Page
Seller-facing queue for reviewing paid orders and recording fulfillment.
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 most affects resource usage for this marketplace?
Which marketplace features are included?
Can one checkout include products from multiple sellers?
How are marketplace listing images handled?
Does the design include online payment?
Copy to discuss with AI
Challenge & re-estimate
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