# Adyen MCP server vs PayPal MCP server > Adyen MCP server scores 60.3 (C) on agent readiness against PayPal MCP server's 56.3 (C), and leads in 4 of 7 scored categories. PayPal MCP server leads on agent ergonomics, payments & pricing and maintenance & community. Both do payments checkout. Category scores, facts… - Canonical: https://www.anchorterminal.com/compare/adyen-mcp-server-vs-paypal-mcp-server - Markdown: https://www.anchorterminal.com/compare/adyen-mcp-server-vs-paypal-mcp-server.md (~2,450 tokens) - Slim: https://www.anchorterminal.com/compare/adyen-mcp-server-vs-paypal-mcp-server.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts) - JSON: https://www.anchorterminal.com/compare/adyen-mcp-server-vs-paypal-mcp-server.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: 2026-10-09 Adyen MCP server scores 60.3 (C) on agent readiness against PayPal MCP server's 56.3 (C), and leads in 4 of 7 scored categories. PayPal MCP server leads on agent ergonomics, payments & pricing and maintenance & community. 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 - PayPal MCP server: grade C, 56.3/100, rank #571 of 842. Markdown https://www.anchorterminal.com/tools/paypal-mcp-server.md · JSON https://www.anchorterminal.com/api/v1/tools/paypal-mcp-server.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 52 - Security & auth, 63 against 48 - Transparency & trust, 83 against 78 Watch for: The README is headed alpha, the package is at 0.6.0, and the server reports itself as version 0.4.0 ### PayPal MCP server (C) Good for: A merchant already on PayPal who wants an assistant to draft and send invoices, look up orders and transactions, and manage subscriptions and disputes. Ahead on: - Agent ergonomics, 66 against 56 - Payments & pricing, 40 against 35 - Maintenance & community, 64 against 42 Also in its favour: - A hosted endpoint, with nothing to install Watch for: The quickstart gives `/http` for streamable HTTP. On 8 October 2026 it returned 404 on both hosts, and `/mcp` returned the OAuth challenge ## Score by category | Category | Weight | Adyen MCP server | PayPal MCP server | Edge | | --- | --- | --- | --- | --- | | Reliability | 16% (20 this run) | 65 | 52 | Adyen MCP server +13 | | Performance | 10%, pending | pending | pending | not scored in this run | | Schema & documentation | 13% (16.2 this run) | 73 | 70 | Adyen MCP server +3 | | Agent ergonomics | 13% (16.2 this run) | 56 | 66 | PayPal MCP server +10 | | Security & auth | 14% (17.5 this run) | 63 | 48 | Adyen MCP server +15 | | Payments & pricing | 10% (12.5 this run) | 35 | 40 | PayPal MCP server +5 | | Task success | 10%, pending | pending | pending | not scored in this run | | Maintenance & community | 7% (8.8 this run) | 42 | 64 | PayPal MCP server +22 | | Transparency & trust | 7% (8.8 this run) | 83 | 78 | Adyen MCP server +5 | | Negative events | ≤15 | 0 | -2 | | | **Total** | | **60.3 · C** | **56.3 · C** | | ## Facts side by side | Fact | Adyen MCP server | PayPal MCP server | | --- | --- | --- | | Kind | MCP server | MCP server | | Vendor | Adyen N.V. | PayPal | | Hosted endpoint | no (local only) | `https://mcp.paypal.com/mcp` | | Transports | stdio | stdio, SSE (legacy), Streamable HTTP | | Auth | API key | OAuth or key | | Pricing | Pay per use | Pay per use | | Price for payments checkout | not published | $0.49 per transaction | | 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 | Apache-2.0 for the local server and the agent toolkit. The hosted server is a closed service under the PayPal Developer Agreement | | Tools exposed | 38 | 28 | | Read-only variant documented | yes | no | | llms.txt | yes | yes | | MCP registry | not listed | `io.github.paypal/paypal-mcp-server` | | Last release | 2026-08-24 | 2026-09-01 | | Terms last updated | 2023-11-01 | 2024-11-18 | | Privacy policy last updated | 2025-08-04 | 2026-09-28 | | 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 | not found in the text | | Arbitration or class-action waiver | yes | yes | | Popularity | 27 stars, 168 npm/wk | 995 npm/wk, 107 PyPI/wk | ## 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. **PayPal MCP server.** The hosted server uses OAuth with PKCE and dynamic client registration, and the local package defaults to the sandbox. No tool carries a read-only or destructive annotation, no confirmation step for refunds or captures was found, and the documented `/http` streamable HTTP path returned 404 on 8 October 2026 while `/mcp` answered. ## 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 ### PayPal MCP server 1. Connect a remote client to `https://mcp.paypal.com/mcp` or `/sse`. The documented `/http` path returned 404 on 8 October 2026 2. Set `PAYPAL_ENVIRONMENT=PRODUCTION` for live calls. Any other value, including the registry's `LIVE`, runs against the sandbox 3. Refresh `PAYPAL_ACCESS_TOKEN` before it expires. The README gives `expires_in` 32400 seconds, and the local server takes no client ID or secret 4. Pass `--tools=` with only the keys the task needs, such as `invoices.list,orders.get`. `--tools=all` loads 28 keys including refunds and captures 5. Ask the user before `create_refund`, `pay_order`, `cancel_subscription` or `accept_dispute_claim`. The server applies them without a confirmation step ## Questions ### Which is better for AI agents, Adyen MCP server or PayPal MCP server? Adyen MCP server scores 60.3 (C) on agent readiness against PayPal MCP server's 56.3 (C), and leads in 4 of 7 scored categories. PayPal MCP server leads on agent ergonomics, payments & pricing and maintenance & community. ### Do Adyen MCP server and PayPal MCP server need an API key? Adyen MCP server needs an API key. PayPal MCP server takes an API key or an OAuth sign-in. ### Can an agent call Adyen MCP server and PayPal MCP server without installing anything? Adyen MCP server runs on your own machine, with no hosted endpoint listed. PayPal MCP server has a hosted endpoint at https://mcp.paypal.com/mcp. ### Are Adyen MCP server and PayPal MCP server open source? Yes. 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). PayPal MCP server is open source (Apache-2.0 for the local server and the agent toolkit. The hosted server is a closed service under the PayPal Developer Agreement). ## For agents - This comparison as JSON: https://www.anchorterminal.com/compare/adyen-mcp-server-vs-paypal-mcp-server.json, and with the fewest tokens: https://www.anchorterminal.com/compare/adyen-mcp-server-vs-paypal-mcp-server.min.md - Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "adyen-mcp-server", "b": "paypal-mcp-server"}`. From a terminal: `anchor compare adyen-mcp-server paypal-mcp-server` - Each listing in full: https://www.anchorterminal.com/api/v1/tools/adyen-mcp-server.json and https://www.anchorterminal.com/api/v1/tools/paypal-mcp-server.json ## Other comparisons with Adyen MCP server or PayPal MCP server - [Adyen MCP server vs Crossmint API + Docs MCP](https://www.anchorterminal.com/compare/adyen-mcp-server-vs-crossmint.md) - [Adyen MCP server vs Nevermined API + MCP](https://www.anchorterminal.com/compare/adyen-mcp-server-vs-nevermined.md) - [Adyen MCP server vs Skyfire API + MCP](https://www.anchorterminal.com/compare/adyen-mcp-server-vs-skyfire.md) - [Adyen MCP server vs Stripe API + MCP](https://www.anchorterminal.com/compare/adyen-mcp-server-vs-stripe-mcp.md) - [Crossmint API + Docs MCP vs PayPal MCP server](https://www.anchorterminal.com/compare/crossmint-vs-paypal-mcp-server.md) - [Nevermined API + MCP vs PayPal MCP server](https://www.anchorterminal.com/compare/nevermined-vs-paypal-mcp-server.md) - [PayPal MCP server vs Skyfire API + MCP](https://www.anchorterminal.com/compare/paypal-mcp-server-vs-skyfire.md) - [PayPal MCP server vs Stripe API + MCP](https://www.anchorterminal.com/compare/paypal-mcp-server-vs-stripe-mcp.md) - [Adyen MCP server vs Payman Genie MCP](https://www.anchorterminal.com/compare/adyen-mcp-server-vs-payman.md)