AI Commerce Protocol Comparison
Compare MCP, ACP, and UCP protocols to choose the right integration for your store
Overview
ZaLinkAI supports three AI commerce protocols, each designed for different AI platforms and use cases. All protocols share the same goal: enabling AI assistants to help customers discover and purchase products from your store.
Key Insight
All three protocols enable product discovery on the Connect tier (99 SAR/year). Checkout sessions and order management require the Manage tier (999 SAR/year). Choose your protocol based on which AI platform you want to integrate with.
Protocol Overview
MCP (Model Context Protocol)
Anthropic's open standard for AI tool integration. Used by Claude.
ACP (Agentic Commerce Protocol)
OpenAI's commerce protocol for ChatGPT shopping and purchases.
UCP (Universal Commerce Protocol)
Google's universal standard for Gemini and Google AI Mode shopping.
Tier Requirements
What you can do at each subscription level
Connect Tier (99 SAR/yr)
- Product discovery and search
- Category browsing
- Store information
- Basic marketplace discovery (3 cross-store, 10 req/hr)
Manage Tier (999 SAR/yr)
- All Connect features
- Checkout sessions (ACP/UCP)
- Order creation and management
- Customer management
- Promotions and discounts
- Priority marketplace discovery (5 cross-store, 60 req/hr)
Feature Comparison
| Feature | MCP (Claude) | ACP (ChatGPT) | UCP (Google) |
|---|---|---|---|
| Primary AI Platform | Claude | ChatGPT | Gemini, Google AI |
| Transport Protocol | JSON-RPC over HTTPS | REST API | REST API + OAuth 2.0 |
| Authentication | API Key (JWT) | API Key + HMAC | OAuth 2.0 + JWK |
| Product Discovery | Yes (all tiers) | Yes (all tiers) | Yes (all tiers) |
| Product Feed Format | JSON-RPC tools | JSONL/CSV | Discovery manifest |
| Checkout Sessions | Cart tools | Embedded checkout | Session API |
| Webhook Signing | HMAC-SHA256 | HMAC-SHA256 | ES256 (JWK) |
| Identity Linking | No | Optional | Yes (OAuth) |
| Agent Management | N/A | N/A | Yes |
| Tier for Discovery | Connect+ | Connect+ | Connect+ |
| Tier for Checkout | Manage+ | Manage+ | Manage+ |
Which Protocol Should I Use?
Follow this decision tree to choose the right protocol for your needs.
Which AI platform do your customers use most?
Recommendations by Use Case
Just Getting Started
Start with MCP (Claude) - it's the simplest to set up and test. You can add ACP and UCP later.
Maximum Reach
Implement all three protocols. ZaLinkAI handles the complexity - your products work across all AI platforms.
Saudi Market Focus
Prioritize ACP (ChatGPT) as it has the highest adoption in Saudi Arabia, then add UCP for Google users.
Enterprise & Developers
Start with MCP for its robust tool ecosystem and easy testing with Claude Desktop.
Implement All Protocols
For maximum reach, implement all three protocols. ZaLinkAI's unified backend means your products, inventory, and orders sync automatically across all AI platforms.
- One product catalog works across all AI assistants
- Orders from any AI appear in your dashboard
- Single analytics view for all AI commerce
- No additional setup per protocol after initial configuration
See Plans
Ready to connect your store to AI? Choose a protocol guide to begin:
Pricing Note
All protocols are included in every ZaLinkAI subscription. The difference is in features by tier, not by protocol. See our pricing page for full tier details.
View Pricing