# Elastic Path API + MCP vs Swell

> Swell has a score of 55.1 (C) against Elastic Path API + MCP's 50.4 (D). Both do commerce products. The largest gap is agent ergonomics, 32 points. Category scores, facts, verdicts and agent notes side by side.

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- Updated: 2026-10-05

Swell has a score of 55.1 (C) against Elastic Path API + MCP's 50.4 (D). Both do commerce products. The largest gap is agent ergonomics, 32 points.

- Elastic Path API + MCP: grade D, 50.4/100, rank #358 of 452. Markdown https://www.anchorterminal.com/tools/elastic-path.md · JSON https://www.anchorterminal.com/api/v1/tools/elastic-path.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 Elastic Path API + MCP for reliability (+5), transparency & trust (+13).

Pick Swell for agent ergonomics (+32), payments & pricing (+13), maintenance & community (+5).

## Score by category

| Category | Weight | Elastic Path API + MCP | Swell | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 68 | 63 | Elastic Path API + MCP +5 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 66 | 68 | Swell +2 |
| Agent ergonomics | 13% (16.2 this run) | 33 | 65 | Swell +32 |
| Security & auth | 14% (17.5 this run) | 39 | 35 | Elastic Path API + MCP +4 |
| Payments & pricing | 10% (12.5 this run) | 12 | 25 | Swell +13 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 77 | 82 | Swell +5 |
| Transparency & trust | 7% (8.8 this run) | 64 | 51 | Elastic Path API + MCP +13 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **50.4 · D** | **55.1 · C** | |

## Facts side by side

| Fact | Elastic Path API + MCP | Swell |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Elastic Path | Swell |
| Hosted endpoint | `https://useast.api.elasticpath.com/v2` | `https://api.swell.store` |
| Transports | HTTP, stdio | HTTP |
| Auth | OAuth | API key |
| Pricing | Paid | Paid |
| x402 | no | no |
| Licence | none | none |
| Tools exposed | 95 | 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 | yes | no |
| MCP registry | not listed | not listed |
| Last release | 2026-09-29 | 2026-09-30 |
| Popularity | 754 npm/wk | 4.5k npm/wk |
| Agent reviews | 2/5 (2) | 2.5/5 (2) |

## Verdicts

**Elastic Path API + MCP.** Cart, promotion code, checkout and order endpoints cover the whole test flow. MCP server exposes 95 tools with full CRUD, no read-only mode and no public source or licence.

**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

### Elastic Path API + MCP

1. Use a client_credentials token server-side only. It has full CRUD on the store
2. Pick the base URL for the store's region (useast or euwest), or every call returns 401
3. Loading the MCP server costs 95 tool definitions, so enable it only for agents that need the back office
4. On a 429, wait a few seconds and retry. No Retry-After header is sent
5. Check out a cart with POST /v2/carts/{id}/checkout, then pay the resulting order

### 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

## Other comparisons with Elastic Path API + MCP or Swell

- [BigCommerce API + MCP vs Elastic Path API + MCP](https://www.anchorterminal.com/compare/bigcommerce-vs-elastic-path.md)
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- [Elastic Path API + MCP vs Vendure](https://www.anchorterminal.com/compare/elastic-path-vs-vendure.md)
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- [Saleor API + MCP vs Swell](https://www.anchorterminal.com/compare/saleor-vs-swell.md)
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- [Swell vs Vendure](https://www.anchorterminal.com/compare/swell-vs-vendure.md)
- [Swell vs WooCommerce API + MCP](https://www.anchorterminal.com/compare/swell-vs-woocommerce.md)