# Fabric vs Square

> Square scores 69.2 (B) to Fabric's 43.7 (E) for commerce orders. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/fabric-vs-square
- Markdown: https://www.anchorterminal.com/compare/fabric-vs-square.md (~2,600 tokens)
- Slim: https://www.anchorterminal.com/compare/fabric-vs-square.min.md (~680 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/fabric-vs-square.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-14

Square scores 69.2 (B) on agent readiness against Fabric's 43.7 (E), and leads in every scored category. Both do commerce orders.

- Fabric: grade E, 43.7/100, rank #949 of 1076. Markdown https://www.anchorterminal.com/tools/fabric.md · JSON https://www.anchorterminal.com/api/v1/tools/fabric.json
- Square: grade B, 69.2/100, rank #202 of 1076. Markdown https://www.anchorterminal.com/tools/square.md · JSON https://www.anchorterminal.com/api/v1/tools/square.json
- Best commerce platforms and checkout APIs for AI agents: https://www.anchorterminal.com/best/commerce/index.md
- All 171 commerce comparisons: https://www.anchorterminal.com/compare/commerce/index.md

## Which one, for what

### Fabric (E)

Good for: A merchant-side API for retailers already on Fabric's order management, catalogue or dropship products.

Watch for: No public price, free tier or self-serve signup. A trial account is arranged with Fabric

### 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:
- Reliability, 58 against 23
- Schema & documentation, 87 against 79
- Agent ergonomics, 83 against 57
- Security & auth, 67 against 62
- Payments & pricing, 40 against 0
- Maintenance & community, 81 against 15
- Transparency & trust, 70 against 55

Also in its favour:
- Runs on your own machine

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


## Score by category

| Category | Weight | Fabric | Square | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 23 | 58 | Square +35 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 79 | 87 | Square +8 |
| Agent ergonomics | 13% (16.2 this run) | 57 | 83 | Square +26 |
| Security & auth | 14% (17.5 this run) | 62 | 67 | Square +5 |
| Payments & pricing | 10% (12.5 this run) | 0 | 40 | Square +40 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 15 | 81 | Square +66 |
| Transparency & trust | 7% (8.8 this run) | 55 | 70 | Square +15 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **43.7 · E** | **69.2 · B** | |

## Facts side by side

| Fact | Fabric | Square |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Commerce Fabric, Inc. | Block, Inc. |
| Hosted endpoint | `https://api.fabric.inc/v3` | `https://mcp.squareup.com/mcp` |
| Transports | HTTP | HTTP, Streamable HTTP, stdio |
| Auth | OAuth | OAuth or key |
| Pricing | Paid | Pay per use |
| x402 | no | no |
| Licence | Proprietary SaaS under Fabric's Terms and Conditions (last updated 1 January 2026) and an order form | Proprietary 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 MIT |
| Tools exposed | none | 3 |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | none | 2026-09-16 |
| Terms last updated | 2026-01-01 | 2026-09-10 |
| Privacy policy last updated | 2021-01-14 | 2026-09-15 |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | not found in the text | yes |
| Terms restrict benchmarking | yes | yes |
| Terms or service can change without notice | not found in the text | not found in the text |
| Arbitration or class-action waiver | not found in the text | yes |
| Popularity | none | 454k npm/wk, 72k PyPI/wk |

## Verdicts

**Fabric.** Public OpenAPI files for about 980 operations, llms.txt, client credentials with role-limited system apps, and a published 99.9 per cent SLA. Access needs a sales contract, with no public price or self-serve trial. The commerce docs are labelled legacy, the newest release notes date from July 2025, and no status page was found.

**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.

## Before you call either

### Fabric

1. Get the tenant ID and a System App client ID and secret from the merchant's Copilot admin, with the narrowest role the task needs
2. Request a new system token from {authURL}/v1/token every 10 minutes, since system apps receive no refresh token
3. Send x-fabric-tenant-id on every call, and x-fabric-channel-id where the merchant sells in more than one channel
4. Page order searches with offset and limit, because the default response returns 10 orders
5. Read errorCode and context.endpoint in Orders and Inventory errors, and check for duplicates before retrying a write

### 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

## Questions

### Which is better for AI agents, Fabric or Square?

Square scores 69.2 (B) on agent readiness against Fabric's 43.7 (E), and leads in every scored category.

### Do Fabric and Square need an API key?

Fabric uses an OAuth sign-in. Square takes an API key or an OAuth sign-in.

### Can an agent call Fabric and Square without installing anything?

Yes. Fabric has a hosted endpoint at https://api.fabric.inc/v3 and Square at https://mcp.squareup.com/mcp.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/fabric-vs-square.json, and with the fewest tokens: https://www.anchorterminal.com/compare/fabric-vs-square.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "fabric", "b": "square"}`. From a terminal: `anchor compare fabric square`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/fabric.json and https://www.anchorterminal.com/api/v1/tools/square.json

## Other comparisons with Fabric or Square

- [Adobe Commerce (Magento) vs Fabric](https://www.anchorterminal.com/compare/adobe-commerce-vs-fabric.md)
- [Adobe Commerce (Magento) vs Square](https://www.anchorterminal.com/compare/adobe-commerce-vs-square.md)
- [Agentzon vs Fabric](https://www.anchorterminal.com/compare/agentzon-vs-fabric.md)
- [Agentzon vs Square](https://www.anchorterminal.com/compare/agentzon-vs-square.md)
- [BigCommerce API + MCP vs Fabric](https://www.anchorterminal.com/compare/bigcommerce-vs-fabric.md)
- [BigCommerce API + MCP vs Square](https://www.anchorterminal.com/compare/bigcommerce-vs-square.md)
- [Commerce Layer API + MCP vs Fabric](https://www.anchorterminal.com/compare/commerce-layer-vs-fabric.md)
- [Commerce Layer API + MCP vs Square](https://www.anchorterminal.com/compare/commerce-layer-vs-square.md)
- [commercetools vs Fabric](https://www.anchorterminal.com/compare/commercetools-vs-fabric.md)
- [commercetools vs Square](https://www.anchorterminal.com/compare/commercetools-vs-square.md)
- [Ecwid by Lightspeed vs Fabric](https://www.anchorterminal.com/compare/ecwid-vs-fabric.md)
- [Ecwid by Lightspeed vs Square](https://www.anchorterminal.com/compare/ecwid-vs-square.md)
- [Elastic Path API + MCP vs Fabric](https://www.anchorterminal.com/compare/elastic-path-vs-fabric.md)
- [Elastic Path API + MCP vs Square](https://www.anchorterminal.com/compare/elastic-path-vs-square.md)
- [Medusa API + MCP vs Square](https://www.anchorterminal.com/compare/medusa-vs-square.md)
- [Saleor API + MCP vs Square](https://www.anchorterminal.com/compare/saleor-vs-square.md)
- [Shopify API + MCP vs Square](https://www.anchorterminal.com/compare/shopify-vs-square.md)
- [Shopware vs Square](https://www.anchorterminal.com/compare/shopware-vs-square.md)
- [Snipcart API + MCP vs Square](https://www.anchorterminal.com/compare/snipcart-vs-square.md)
- [Spree Commerce vs Square](https://www.anchorterminal.com/compare/spree-commerce-vs-square.md)
- [Square vs Swell](https://www.anchorterminal.com/compare/square-vs-swell.md)
- [Square vs Vendure](https://www.anchorterminal.com/compare/square-vs-vendure.md)
- [Square vs Wix Stores and eCommerce API](https://www.anchorterminal.com/compare/square-vs-wix.md)
- [Square vs WooCommerce API + MCP](https://www.anchorterminal.com/compare/square-vs-woocommerce.md)
- [Fabric vs Medusa API + MCP](https://www.anchorterminal.com/compare/fabric-vs-medusa.md)
- [Fabric vs Saleor API + MCP](https://www.anchorterminal.com/compare/fabric-vs-saleor.md)
- [Fabric vs Shopify API + MCP](https://www.anchorterminal.com/compare/fabric-vs-shopify.md)
- [Fabric vs Shopware](https://www.anchorterminal.com/compare/fabric-vs-shopware.md)
- [Fabric vs Snipcart API + MCP](https://www.anchorterminal.com/compare/fabric-vs-snipcart.md)
- [Fabric vs Spree Commerce](https://www.anchorterminal.com/compare/fabric-vs-spree-commerce.md)
- [Fabric vs Swell](https://www.anchorterminal.com/compare/fabric-vs-swell.md)
- [Fabric vs Vendure](https://www.anchorterminal.com/compare/fabric-vs-vendure.md)
- [Fabric vs Wix Stores and eCommerce API](https://www.anchorterminal.com/compare/fabric-vs-wix.md)
- [Fabric vs WooCommerce API + MCP](https://www.anchorterminal.com/compare/fabric-vs-woocommerce.md)