"Examples of MCPs (Microservices Communication Protocols) That Do Not Require API Keys" matching MCP connectors:

Give your AI agent a spending limit: approval controls and single-use virtual cards.

See what actually settles on x402: wash-adjusted volume, payTo checks. Free, no key, no signup.

Reviewed competitor pricing, offer comparisons, and market-change evidence with x402 payments.

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).

The Apiosk MCP lets AI agents discover, pay for, execute, and publish APIs through the Apiosk gateway. It is a machine endpoint, not a website, so connect it from an MCP client (Claude, Cursor, ChatGPT, and others) rather than browsing it here.

Feed of x402/L402 services newly listed on 402index.io within a recency window (candidate #8, manual

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

Pre-payout IBAN screening for AI agents: validation, sanctions, Swiss clearing, risk scoring

The trust layer of the x402 economy: free conformance checks, attestation, corpus, agent store.

Processor fees, charge-to-net, invoice totals and proration. 3 of 6 tools free.

Verified directory for machine payments (x402 & MPP): check services and wallets before agents pay.

AML/compliance address screening for AI agent payments — free tools, no API key.

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

Let your agent hire humans or other agents, and be hired. Post jobs, take bids, pay on completion.

RU specialty stores only. Controlled AI agent budget, allowlisted shops. Not x402.

Real Australian lender serviceability, plus repayments, borrowing power and stamp duty.

Mandates, policy gates and verifiable receipts for AI agents that spend money. Live is fail-closed.

Issue registered Brazilian bank slips (boleto) and Pix charges on PagHiper with the official API. Cr

Payments and pricing math sellers do weekly, computed deterministically over MCP: processor_fees breaks down payment costs with editable presets, charge_to_net answers what to charge to net a target amount, invoice_total validates and totals line items, with discount_stack, proration, and installment_plan in the premium tier.

320 AI models + 2,720 pay-per-call APIs. x402 USDC on Base or Solana, no API key.