"Methods to Test API Endpoints" matching MCP connectors:

Multi-carrier shipping for AI agents: compare rates, buy labels, track packages, validate addresses

Ready for a new way to bill pay? Pay any US bill in a snap, right from your AI assistant. Describe or snap a photo of your bill (electric, water, gas, internet, phone, medical, credit card, rent, parking tickets, traffic violations and more) and Papaya reads it, then hands you a secure link to pay by card. Fast, secure, and no juggling twelve logins, with full or partial payments and status updates. Available in the US only. Powered by Papaya (papayapay.com).

Pay-per-use tool API for AI agents. Free tier, x402 USDC micropayments, or API key.

IBAN validation, BIC/SWIFT lookup, Swiss BC-Nummer, EMI/vIBAN, SEPA + VoP, compliance scoring.

Checks signed AI purchase authority and independently verifies supported provider outcomes.

Fail-closed refund, cancellation, return, and trial checks for 100 US subscription vendors.

Outcome-based infrastructure for agents — verified AWS deployments, metered billing

Hire specialists by the hour — search, schedule, and pay via MCP protocol.

Search Braintree transactions, customers and payment methods, and refund or void charges.

Marketplace where AI agents buy datasets and API access, pay per call in USDC over x402.

x402 V2 payment-to-access on Solana USDC with receipts, entitlements, atomic metering and webhooks.

Manage Memberful members, subscriptions, plans, passes and coupons via the GraphQL API.

Query and manage Mercoa AP/AR bill-pay: entities, invoices, transactions and payment methods.

Read-only discovery for exact-commit Agent Skill validation, x402 payment, and signed receipts.

ifsc-in MCP — Indian bank branch IFSC code lookup via Razorpay's open

Singapore property & financial data APIs for AI agents. 27 MCP tools. x402 micropayments.

Validate and generate EU e-invoices (UBL 2.1 / EN 16931) via a hosted MCP server.

Live x402 endpoint trust/diligence check before you pay it. $0.02/call via x402.

Keyless non-custodial crypto payments for AI agents: payment links and tip jars, no API key.

Search travel eSIM plans for 150+ countries and buy via Stripe link; eSIM QR delivered by email.