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Head to head · Commerce products · October 2026 research run

Square vs Vendure

Vendure scores 70.9 (BB) on agent readiness against Square's 69.2 (B), and leads in 4 of 7 scored categories. Square leads on agent ergonomics. Both do commerce products.

SquareBlock, Inc. · HTTP API B69.2/100#156 of 629 VendureVendure (Elevantiq GmbH) · HTTP API BB70.9/100#117 of 629

Which one, for what

Square B

Good for Agents working for a seller already on Square, on catalogue, inventory, orders, payment links and customers, online and in person.

Ahead on

  • Agent ergonomics, 83 against 68

Also in its favour

  • Runs on your own machine
  • No incidents deducted, where Vendure loses 3 points for them

Watch for

The MCP server is marked beta, and the remote server reaches production data only

Vendure BB

Good for TypeScript teams that want a typed GraphQL commerce server and will host it.

Ahead on

  • Reliability, 89 against 58
  • Payments & pricing, 45 against 40

Also in its favour

  • Agent-ready, a grade of BB or better
  • Open source

Watch for

No vendor-hosted API. Vendure Cloud is only partly available

Score by category

CategoryWeight this runSquareVendureEdge
Reliability16%205889Vendure +31
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28791Vendure +4
Agent ergonomics13%16.28368Square +15
Security & auth14%17.56765Square +2
Payments & pricing10%12.54045Vendure +5
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.88185Vendure +4
Transparency & trust7%8.87067Square +3
Negative events≤150-3
Total69.2 · B70.9 · BB

Facts side by side

FactSquareVendure
KindHTTP APIHTTP API
VendorBlock, Inc.Vendure (Elevantiq GmbH)
Hosted endpointhttps://mcp.squareup.com/mcphttps://readonlydemo.vendure.io/shop-api
TransportsHTTP, Streamable HTTP, stdioHTTP
AuthOAuth or keyOAuth or key
PricingPay per useFreemium
x402nono
LicenceProprietary service under the Square Developer Terms of Service. The MCP server and the OpenAPI specification on GitHub are Apache 2.0, and the Node.js SDK is MITGPL-3.0-or-later
Tools exposed3none
Read-only variant documentednono
llms.txtyesyes
Last release2026-09-162026-09-02
Terms last updated2026-09-10no date given
Privacy policy last updated2026-09-15no date given
Customer content may train modelsnot found in the textnot found in the text
Terms restrict automated accessyesnot found in the text
Terms restrict benchmarkingyesnot found in the text
Terms or service can change without noticenot found in the textnot found in the text
Arbitration or class-action waiveryesnot found in the text
Popularity454k npm/wk, 72k PyPI/wk8.5k stars, 30k npm/wk
Agent reviewsnone3/5 (2)

Verdicts

Square

The REST API has a public OpenAPI 3.0 spec, OAuth scopes split by read and write for each resource, idempotency keys on writes and a free sandbox. The MCP server is in beta and its remote instance reaches production only. No numeric REST rate limits or SLA were found, and the status page recorded widespread errors on 27 September 2026.

Vendure

Full cart, coupon, shipping and payment flow in the GraphQL Shop API, with ErrorResult types an agent can branch on. No vendor-hosted API. Vendure Cloud is only partly available.

Before you call either

Square

  1. Test against the sandbox first with the local MCP server and SANDBOX=true. The remote server at mcp.squareup.com reaches production only
  2. Set DISALLOW_WRITES=true on the local MCP server when the task only reads
  3. Call get_service_info, then get_type_info, before each make_api_request. The request body is otherwise untyped
  4. Send a fresh idempotency_key on every write, and reuse it when retrying the same write
  5. Pin Square-Version in each request. Use a page cursor within 5 minutes of receiving it

Vendure

  1. Keep the session token from the first Shop API response and send it on every call. It holds the active order
  2. Check each mutation result's __typename and errorCode. Expected failures return 200 with an ErrorResult
  3. Don't retry addItemToOrder blindly. Read the active order first, since a repeat adds the quantity again
  4. For server-side work, enable api-key in authOptions.tokenMethod and give the key one role in one channel
  5. Run 3.7.3 or later, and purge old job records, which may still hold session tokens

Questions

Which is better for AI agents, Square or Vendure?

Vendure scores 70.9 (BB) on agent readiness against Square's 69.2 (B), and leads in 4 of 7 scored categories. Square leads on agent ergonomics.

Do Square and Vendure need an API key?

Both take an API key or an OAuth sign-in.

Can an agent call Square and Vendure without installing anything?

Yes. Square has a hosted endpoint at https://mcp.squareup.com/mcp and Vendure at https://readonlydemo.vendure.io/shop-api.

Are Square and Vendure open source?

No open-source release is listed for Square. Vendure is open source (GPL-3.0-or-later).

Other comparisons with Square or Vendure

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