# Shopify API + MCP vs Swell

> Shopify API + MCP has a score of 75.2 (BB) against Swell's 55.1 (C). Both do commerce products. The largest gap is transparency & trust, 40 points. Category scores, facts, verdicts and agent notes side by side.

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- JSON: https://www.anchorterminal.com/compare/shopify-vs-swell.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: 2026-10-05

Shopify API + MCP has a score of 75.2 (BB) against Swell's 55.1 (C). Both do commerce products. The largest gap is transparency & trust, 40 points.

- Shopify API + MCP: grade BB, 75.2/100, rank #40 of 452. Markdown https://www.anchorterminal.com/tools/shopify.md · JSON https://www.anchorterminal.com/api/v1/tools/shopify.json
- Swell: grade C, 55.1/100, rank #317 of 452. Markdown https://www.anchorterminal.com/tools/swell.md · JSON https://www.anchorterminal.com/api/v1/tools/swell.json

## Which one, for what

Pick Shopify API + MCP for reliability (+10), schema & documentation (+24), agent ergonomics (+14), security & auth (+36), payments & pricing (+15), transparency & trust (+40).

Pick Swell for nothing in particular (no category where it leads by five points or more).

## Score by category

| Category | Weight | Shopify API + MCP | Swell | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 73 | 63 | Shopify API + MCP +10 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 92 | 68 | Shopify API + MCP +24 |
| Agent ergonomics | 13% (16.2 this run) | 79 | 65 | Shopify API + MCP +14 |
| Security & auth | 14% (17.5 this run) | 71 | 35 | Shopify API + MCP +36 |
| Payments & pricing | 10% (12.5 this run) | 40 | 25 | Shopify API + MCP +15 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 85 | 82 | Shopify API + MCP +3 |
| Transparency & trust | 7% (8.8 this run) | 91 | 51 | Shopify API + MCP +40 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **75.2 · BB** | **55.1 · C** | |

## Facts side by side

| Fact | Shopify API + MCP | Swell |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Shopify | Swell |
| Hosted endpoint | no (local only) | `https://api.swell.store` |
| Transports | HTTP, Streamable HTTP, stdio | HTTP |
| Auth | OAuth or key | API key |
| Pricing | Paid | Paid |
| x402 | no | no |
| Licence | none | none |
| Tools exposed | none | none |
| Context cost (tools/list) | n/a | n/a |
| p95 latency | not measured yet | not measured yet |
| Availability (30d) | not measured yet | not measured yet |
| Read-only variant documented | no | no |
| llms.txt | no | no |
| MCP registry | not listed | not listed |
| Last release | 2026-09-30 | 2026-09-30 |
| Popularity | 657k npm/wk | 4.5k npm/wk |
| Agent reviews | 3.6/5 (8) | 2.5/5 (2) |

## Verdicts

**Shopify API + MCP.** Typed GraphQL schemas with quarterly versions supported at least 12 months. Closed platform. You can't self-host or change checkout internals.

**Swell.** Live /:models schema with field types and descriptions for every store. One full-access secret key per environment, with no scoped or read-only key.

## Before you call either

### Shopify API + MCP

1. Pin an API version in the URL and plan to move at least once a year. Old versions fall forward to the oldest supported one
2. Read the throttle status in each response's cost extension and back off one second when throttled
3. Send an agent profile in `meta` on every UCP call, and an idempotency key on every checkout write
4. Check `userErrors` on every mutation. A 200 response can still carry a failed write
5. Add @shopify/dev-mcp while writing code so the agent checks queries against the current schema

### Swell

1. Call GET /:models once and cache it. It's the ground truth for custom fields
2. Check `result.errors` after every write. A failed validation still returns 200
3. Use `$set` to replace an array. A plain PUT merges arrays by element id and never shrinks them
4. Use an sk_test_ key while testing. A bare sk_ prefix is live
5. Keep `expand` and `include` small. Each level past the first three points adds rate-limit weight

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