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Head to head · Payments checkout · October 2026 research run

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.

Adyen MCP serverAdyen N.V. · MCP server C60.3/100#471 of 841 PayPal MCP serverPayPal · MCP server C56.3/100#571 of 841

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

CategoryWeight this runAdyen MCP serverPayPal MCP serverEdge
Reliability16%206552Adyen MCP server +13
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.27370Adyen MCP server +3
Agent ergonomics13%16.25666PayPal MCP server +10
Security & auth14%17.56348Adyen MCP server +15
Payments & pricing10%12.53540PayPal MCP server +5
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.84264PayPal MCP server +22
Transparency & trust7%8.88378Adyen MCP server +5
Negative events≤150-2
Total60.3 · C56.3 · C

Facts side by side

FactAdyen MCP serverPayPal MCP server
KindMCP serverMCP server
VendorAdyen N.V.PayPal
Hosted endpointno (local only)https://mcp.paypal.com/mcp
Transportsstdiostdio, SSE (legacy), Streamable HTTP
AuthAPI keyOAuth or key
PricingPay per usePay per use
Price for payments checkoutnot published$0.49 per transaction
x402nono
LicenceMIT for the server. The Adyen APIs it calls are a closed service under a merchant agreement and the Adyen Terms and ConditionsApache-2.0 for the local server and the agent toolkit. The hosted server is a closed service under the PayPal Developer Agreement
Tools exposed3828
Read-only variant documentedyesno
llms.txtyesyes
MCP registrynot listedio.github.paypal/paypal-mcp-server
Last release2026-08-242026-09-01
Terms last updated2023-11-012024-11-18
Privacy policy last updated2025-08-042026-09-28
Customer content may train modelsyesyes
Terms restrict automated accessnot found in the textnot found in the text
Terms restrict benchmarkingnot found in the textnot found in the text
Terms or service can change without noticenot found in the textnot found in the text
Arbitration or class-action waiveryesyes
Popularity27 stars, 168 npm/wk995 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).

Other comparisons with Adyen MCP server or PayPal MCP server

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