We build Shopify Functions using the modern extension-only architecture that runs custom logic at the edge in under 5 milliseconds. Compiled to WebAssembly for maximum performance, our functions handle discount calculations, payment customizations, delivery rules, cart transformations, and fulfillment constraints at a scale that was impossible with legacy Script Editor.
INR 2000/hr
~$24/hr
200+
Apps Delivered
4.9/5
Client Rating
<2 Weeks
MVP Delivery
Integrates with the tools you already use
Shopify Functions let you extend core Shopify behavior with custom logic that runs in a sandboxed WebAssembly environment at the edge
Custom discount logic beyond what Shopify's built-in discount system supports. Tiered quantity discounts, bundle pricing, BOGO with complex conditions, customer-segment-specific offers, and time-based promotional rules that execute at checkout in milliseconds.
Control which payment methods are shown, hidden, or reordered at checkout based on cart contents, customer tags, shipping address, or order value. Hide COD for high-value orders, show B2B payment terms for wholesale customers, or enforce payment methods by region.
Rename, reorder, hide, or add custom messaging to shipping options at checkout. Show estimated delivery dates, hide express shipping for bulky items, enforce local pickup for certain products, or display carrier-specific messaging based on destination.
Modify cart line items programmatically before checkout. Auto-add free gifts based on cart value, create product bundles that merge into single line items, apply automatic cart-level adjustments, and implement custom cart rules that reshape the shopping experience.
Custom fulfillment order routing logic that determines which location fulfills each line item. Route orders based on inventory proximity, warehouse capacity, product type, or custom business rules. Optimize shipping costs by splitting orders intelligently across locations.
Define custom constraints on how orders can be fulfilled. Enforce pickup-only for hazardous materials, restrict certain products to specific fulfillment locations, prevent splitting of bundle items across shipments, or enforce cold chain requirements for perishables.
Execution Time
Powered
Runtime
Downtime
A specialized process for developing, testing, and deploying Wasm-compiled functions to Shopify's edge runtime
Custom backend logic running at the edge for your Shopify store. All prices in INR with USD equivalents.
"Our legacy Script Editor discounts were hitting performance limits during flash sales with 10,000+ concurrent checkouts. Edesy rewrote them as Shopify Functions in Rust compiled to Wasm, and execution dropped from 200ms to under 3ms. Our checkout completion rate improved by 4% during our next sale event purely from the speed improvement."
DO
Director of Engineering
Engineering at High-Volume DTC Brand
"We needed payment method customization that hid COD for orders over $200, showed B2B net terms only for approved companies, and reordered payment methods by customer region. No app on the store could handle all three conditions together. Edesy built a single payment customization function that handles all of it in under 2ms per checkout."
EM
E-Commerce Manager
E-Commerce at Global Lifestyle Brand
"Edesy built a cart transform function that automatically bundles complementary products, adds free gifts at specific cart thresholds, and adjusts line item properties for our fulfillment system. The auto-bundling alone increased our average order value by 18%. The function runs on every cart update with zero perceptible latency."
GL
Growth Lead
Growth at Beauty & Skincare Brand
Resources to help you evaluate and implement
Get a free consultation and detailed project estimate. We build Wasm-powered Shopify Functions that execute in under 5ms and give you complete control over discounts, payments, shipping, and fulfillment.