Machine Payments Protocol (MPP)
Payments
Open HTTP payment standard from Stripe and Tempo covering one-shot, recurring, and streaming agent payments across cards, stablecoins, and Lightning
MCPOpenAPIllms.txtMPP
API keyper-transaction
A directory of services AI agents can actually use — APIs, tools and merchants with machine-readable interfaces and agent payment protocols. Badges are probe-backed, never self-asserted.
Payments·Rails and facilitators — x402, MPP, L402
Payments
Open HTTP payment standard from Stripe and Tempo covering one-shot, recurring, and streaming agent payments across cards, stablecoins, and Lightning
Payments
Shared payment tokens, agentic network tokens, and ACP support so businesses can sell through AI agents
Payments
Issue virtual cards agents can spend on, with real-time authorization decisions, per-card spend controls, and full transaction visibility
Payments
USDC issuance, programmable wallets, and Circle Payments for agent-to-agent settlement
Payments
Documentation-first card issuing API for running your own virtual card program, including cards handed to agents
Payments
Enterprise card issuing platform with agentic payment controls and an MCP server over the issuing APIs
Payments
Agentic tokens and Agent Pay registration so verified agents can initiate card payments for a consumer
Payments
Virtual corporate cards created by a human and spent autonomously by an agent, with merchant and category limits
Payments
Metering, authorization, and settlement for agent APIs, including an x402 facilitator and credit-based plans
Payments
Bank account data, balances, and payment initiation, with a remote MCP server over the dashboard APIs
Payments
Network tokens and credentials for approved agents, plus one endpoint bridging TAP, MPP, ACP and UCP
Payments
API gateway that puts an x402 or key-based paywall in front of any endpoint agents call
Alibaba and Ant International trust protocol for agent commerce, running at scale across Asian marketplaces
Amex developer kit for agent-initiated card payments with cardholder-scoped authorization
Payments
Accept stablecoin and crypto payments through a hosted checkout API
Payments
Wallet and mandate infrastructure for agentic checkout, aligned to ACP flows
Payments
Crypto payment gateway API supporting 300+ assets with webhooks and payouts
Payments
Human-in-the-loop payment rails that let agents move real money under explicit approval policies
Payments
Programmatic virtual card issuing with agent-compatible APIs and granular spend rules
Same query as JSON: /api/v1/services?category=pay&auth_method=api-key
