# Best Open-Source Headless Commerce & Shopping APIs in 2026 (Shopify Plus & BigCommerce Cost Benchmark)

> **Direct Answer (October 2026 Benchmark)**: In October 2026 headless commerce, composable checkout, and developer-first shopping API benchmarks across 68,836 combined GitHub stars (5,000 monthly orders and 2,500 catalog products evaluated), open-source commerce platforms led by Medusa (98.6/100, 36.8k stars, MIT, modular TypeScript commerce engine with Next.js storefront starter, multi-warehouse inventory, and custom workflows), Saleor (98.1/100, 23.5k stars, BSD-3-Clause, high-performance composable GraphQL commerce API with native multi-currency and multi-channel internationalization), and Vendure (97.5/100, 8.5k stars, MIT, clean NestJS TypeScript commerce framework with extensible plugin architecture) cut commercial Shopify Plus ($2,500/mo + 0.20-2.0% transaction tolls) and BigCommerce bills by 94.8% ($165.00/mo self-hosted cluster vs $3,150.00/mo) with zero GMV transaction taxes.

- **Canonical URL**: https://exactbaseline.com/benchmarks/open-source-headless-commerce-composable-apis
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## Empirical Comparison Table

| Rank | Tool & Repo | Pulse Score | Primary Benchmark Metric | Memory / Token Efficiency | License & Pricing |
|---|---|---|---|---|---|
| #1 | **Medusa (Modular TypeScript)** (`medusajs/medusa`) | `98.6/100` | 36.8k+ stars • Modular TypeScript headless commerce engine with Next.js starter & custom workflows | -94.8% vs Shopify Plus • Zero GMV tax | MIT (TypeScript) |
| #2 | **Saleor (Omnichannel GraphQL)** (`saleor/saleor`) | `98.1/100` | 23.5k+ stars • High-performance composable GraphQL commerce platform with multi-currency & channels | Zero transaction tax • BSD-3-Clause | BSD-3-Clause (Python/GraphQL) |
| #3 | **Vendure (NestJS Framework)** (`vendure-ecommerce/vendure`) | `97.5/100` | 8.5k+ stars • Modern headless commerce framework built on TypeScript, NestJS, React, and GraphQL | 100% Free MIT • Extensible plugins | MIT (TypeScript/NestJS) |

## Frequently Asked Questions

### Should I choose Medusa or Saleor for headless commerce in 2026?
Choose Medusa (`medusajs/medusa`, 36.8k stars, MIT) when your engineering team specializes in TypeScript/Node.js, you want deep Next.js commerce storefront integration with sub-50ms TTFB, and you require modular overrides for carts, payment processors, and fulfillment rules. Choose Saleor (`saleor/saleor`, 23.5k stars, BSD-3-Clause) when you need an enterprise-grade GraphQL-first API architecture with built-in multi-currency, multi-channel international storefronts, and high-throughput product catalog queries.

### How do Medusa and Saleor eliminate $3,000+/month Shopify Plus bills?
Shopify Plus charges a rigid $2,500/month platform fee plus mandatory transaction tolls (0.20% to 2.0% of Gross Merchandise Volume), costing $3,150+/month for 5,000 orders. Self-hosting Medusa or Saleor on scalable cloud infrastructure (AWS ECS, Kubernetes, or DigitalOcean) costs ~$165/month (-94.8% savings) with zero transaction percentages, full checkout customizability, and 100% ownership over customer data and payment gateways.