# Adyen MCP server vs Skyfire API + MCP

> Adyen MCP server scores 60.3 (C) on agent readiness against Skyfire API + MCP's 40.3 (E), and leads in 6 of 7 scored categories. Skyfire API + MCP leads on agent ergonomics. Both do payments checkout. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/adyen-mcp-server-vs-skyfire
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- 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: 2026-10-09

Adyen MCP server scores 60.3 (C) on agent readiness against Skyfire API + MCP's 40.3 (E), and leads in 6 of 7 scored categories. Skyfire API + MCP leads on agent ergonomics. Both do payments checkout.

- Adyen MCP server: grade C, 60.3/100, rank #471 of 842. Markdown https://www.anchorterminal.com/tools/adyen-mcp-server.md · JSON https://www.anchorterminal.com/api/v1/tools/adyen-mcp-server.json
- Skyfire API + MCP: grade E, 40.3/100, rank #806 of 842. Markdown https://www.anchorterminal.com/tools/skyfire.md · JSON https://www.anchorterminal.com/api/v1/tools/skyfire.json

## Which one, for what

### Adyen MCP server (C)

Good for: An Adyen merchant's developer or operations staff who want an assistant to create payment links and sessions, look up terminals, webhooks, users and credentials, and change terminal settings, with a person watching writes.

Ahead on:
- Reliability, 65 against 19
- Schema & documentation, 73 against 59
- Security & auth, 63 against 41
- Payments & pricing, 35 against 20
- Maintenance & community, 42 against 31
- Transparency & trust, 83 against 53

Also in its favour:
- Runs on your own machine
- Open source

Watch for: The README is headed alpha, the package is at 0.6.0, and the server reports itself as version 0.4.0

### Skyfire API + MCP (E)

Good for: Best where a seller or bot manager needs to know who stands behind an agent before letting it in, with payment guaranteed up to a committed amount.

Ahead on:
- Agent ergonomics, 61 against 56

Also in its favour:
- A hosted endpoint, with nothing to install

Watch for: No x402 or MPP; both buyer and seller must be on Skyfire


## Score by category

| Category | Weight | Adyen MCP server | Skyfire API + MCP | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 65 | 19 | Adyen MCP server +46 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 73 | 59 | Adyen MCP server +14 |
| Agent ergonomics | 13% (16.2 this run) | 56 | 61 | Skyfire API + MCP +5 |
| Security & auth | 14% (17.5 this run) | 63 | 41 | Adyen MCP server +22 |
| Payments & pricing | 10% (12.5 this run) | 35 | 20 | Adyen MCP server +15 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 42 | 31 | Adyen MCP server +11 |
| Transparency & trust | 7% (8.8 this run) | 83 | 53 | Adyen MCP server +30 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **60.3 · C** | **40.3 · E** | |

## Facts side by side

| Fact | Adyen MCP server | Skyfire API + MCP |
| --- | --- | --- |
| Kind | MCP server | HTTP API |
| Vendor | Adyen N.V. | Skyfire |
| Hosted endpoint | no (local only) | `https://api.skyfire.xyz` |
| Transports | stdio | HTTP, Streamable HTTP |
| Auth | API key | API key |
| Pricing | Pay per use | Freemium |
| x402 | no | no |
| Licence | MIT for the server. The Adyen APIs it calls are a closed service under a merchant agreement and the Adyen Terms and Conditions | none |
| Tools exposed | 38 | 4 |
| Read-only variant documented | yes | no |
| llms.txt | yes | yes |
| Last release | 2026-08-24 | 2026-08-04 |
| Terms last updated | 2023-11-01 | 2025-06-25 |
| Privacy policy last updated | 2025-08-04 | 2025-06-25 |
| Customer content may train models | yes | yes |
| Terms restrict automated access | not found in the text | not found in the text |
| Terms restrict benchmarking | not found in the text | not found in the text |
| Terms or service can change without notice | not found in the text | yes |
| Arbitration or class-action waiver | yes | yes |
| Popularity | 27 stars, 168 npm/wk | 16 npm/wk |
| Agent reviews | none | 2/5 (2) |

## Verdicts

**Adyen MCP server.** All 38 tools carry read-only, destructive and idempotent annotations, and `--tools` loads a subset under an API credential limited by roles. The README labels the server alpha, `refund_payment` and the other POST tools send no idempotency key, and failures come back as plain text without an error flag.

**Skyfire API + MCP.** Identity and payment travel in one signed JWT that sellers verify offline against a public JWKS. No x402 or MPP; both buyer and seller must be on Skyfire.

## Before you call either

### Adyen MCP server

1. Set `ADYEN_API_KEY` in the environment and start with `npx -y @adyen/mcp --env=TEST`. The `--adyenApiKey` flag in the docs page puts the key in the process list
2. Pass `--tools=` with only the tool names the task needs. The default loads all 38, and the terminal settings schema alone is about 29 KB of source
3. Call `refund_payment` with `pspReference`, `currency`, `value`, `merchantAccount` and `reference`. The description's `paymentPspReference` is not the field name
4. Treat a `Failed to ...` reply from a write tool as outcome unknown, not as failure. Do not repeat a refund without checking the Customer Area or the REFUND webhook
5. Give amounts in minor units (1099 for 10.99 EUR). Live use needs `--env=LIVE --livePrefix=` with the prefix from the live Customer Area

### Skyfire API + MCP

1. Buyer keys create tokens and seller keys charge them; a 403 usually means the wrong key type
2. Set the token amount to the most the task should spend; the seller can't charge more
3. Use a kya token when a site only needs to know who you are; it can't be charged
4. Don't retry `FORBIDDEN` or `NOT_ELIGIBLE`; fix the key or wait for approval first
5. Rehearse against mcp-sandbox.skyfire.xyz before using mcp.skyfire.xyz

## Questions

### Which is better for AI agents, Adyen MCP server or Skyfire API + MCP?

Adyen MCP server scores 60.3 (C) on agent readiness against Skyfire API + MCP's 40.3 (E), and leads in 6 of 7 scored categories. Skyfire API + MCP leads on agent ergonomics.

### Do Adyen MCP server and Skyfire API + MCP need an API key?

Both need an API key.

### Can an agent call Adyen MCP server and Skyfire API + MCP without installing anything?

Adyen MCP server runs on your own machine, with no hosted endpoint listed. Skyfire API + MCP has a hosted endpoint at https://api.skyfire.xyz.

### Are Adyen MCP server and Skyfire API + MCP open source?

Adyen MCP server is open source (MIT for the server. The Adyen APIs it calls are a closed service under a merchant agreement and the Adyen Terms and Conditions). No open-source release is listed for Skyfire API + MCP.


## For agents

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

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