For testing payments, Stripe is the most established option, offering test-mode helpers and a dedicated CLI and SDKs 1. Other sources cover sandbox-style payment testing: Lunium offers a sandbox for PIX and stablecoin payments 6, PayRam provides mock webhook events for local testing 8, and Plaid offers sandbox simulation endpoints 4.
- 1
Stripestripe.comverified and signed
Financial services platform with test-mode helper actions such as simulating terminal payment presentments and test settlements, plus a CLI and SDKs for testing payments 1.
official:MCP server · @stripe/mcpAPI · Stripe APISDK · stripelibrary · Stripe.netCLI · stripe-cli+37 community tools built for it
for agents: PostTestHelpersIssuingSettlements · PostTestHelpersTerminalReadersReaderPresentPaymentMethod · PostTestHelpersTreasuryOutboundPaymentsIdPost
- 2
LuniumPayluniumpay.comverified and signed
Brazilian PIX and stablecoin payments API with a sandbox for testing, including self-provisioned test keys and synthetic end-to-end test journeys 6.
official:MCP server · com.luniumpay/luniumMCP server · Lunium — Brazilian PIX and stablecoin payments
for agents: Get your own sandbox API key (no API key required) · Get your own sandbox API key (no API key required) · Run a synthetic sandbox test
- 3
PayRampayram.comfound in code, not yet checked
Self-hosted payment gateway that generates mock webhook events to test payment flows against a local endpoint 8.
official:MCP server · PayRam+1 community tools built for it
for agents: test_payram_connection · generate_mock_webhook_event · generate_payment_sdk_snippet
- 4
Plaid APIplaid.comverified and signed
Financial data API with sandbox endpoints to simulate bank transfer events and create test items for testing 4.
official:API · The Plaid API+16 community tools built for it
for agents: sandboxBankTransferSimulate · sandboxProcessorTokenCreate · sandboxTransferTestClockCreate
Sources
- 1Stripe | Financial Infrastructure to Grow Your Revenuestripe.com · read 2026-10-29
- 4Home | Plaid Docsplaid.com · read 2026-10-29
- 6LuniumPay | API Pix para receber e enviar pagamentosluniumpay.com · read 2026-10-29
- 8PayRam | Self-Hosted Payment Gateway for Humans & AI Agentspayram.com · read 2026-10-29
For agents: the 10 actions behind this answer
PostTestHelpersIssuingSettlements · Stripe API verified and signed
Create a test-mode settlement
list_specs · fetchsandbox-mcp found in code, not yet checked
Browse the FetchSandbox spec catalog — every API (Stripe, GitHub,
pay-for-service · pay-for-service verified and signed
Make a paid API request to an x402 endpoint with automatic USDC payment. Use when you or the user want to call a paid API, make an x402 request, use a paid service, or pay for an API call. Use after finding a service with search-for-service.
sandboxBankTransferSimulate · The Plaid API verified and signed
Simulate a bank transfer event in Sandbox
listPaymentMethodsForUser · Netlify's API documentation verified and signed
Get your own sandbox API key (no API key required) · Lunium verified and signed
Provisions a Lunium TEST api key for you, in one call, with no prior credentials, no human approval and no money involved. Use it when a Lunium tool told you erro="chave_ausente" and you want to explore the API yourself instead of stopping to ask your user for credentials.
sandbox · @daytonaio/sdk verified and signed
test_payram_connection · PayRam MCP Server found in code, not yet checked
Deprecated: use payram_doctor, which does this and more. Read-only check that a PayRam server is reachable and healthy and, if an API key is supplied, that the key is accepted. Never creates payments.
paypal · paypal verified and signed
PayPal development plugin for Claude — integrate payments, subscriptions, invoices, disputes, and more using PayPal's APIs and MCP server
CreateX402PaymentHeader · mcp-x402 found in code, not yet checked
Create the X402 payment headers for a given payment request as per https://www.x402.org/
Labels are the instruments' verdict and are never changed by ranking. Agents and robots get this same answer as JSON at /api/v1/find?q=…&answer=1 and through the MCP server.