MPP explorer
The Machine Payments Protocol (Stripe + Tempo, March 2026) is the second open standard for machine-to-machine payments. This is the live MPP service catalog, indexed from the protocol's public registry — and OpenSpender is being built to speak both standards.
139
mpp services indexed
137
active
9
top categories
tempo · stripe · evm
payment methods
13 matching
| service | categories | payment methods | status |
|---|---|---|---|
agentfax — Send a fax to any phone number, priced per page. Pay-per-fax for AI agents — no signup, no API key; documents are never stored. agentfax.val.run | social | tempo | active |
AgentMail — Email inboxes for AI agents. mpp.api.agentmail.to | aisocial | tempo | active |
molty.cash — USDC payment infrastructure for AI agents and humans. Send tips, hire people for tasks, and create/earn from gigs — all settled on-chain via x402 (Base, Solana, api.molty.cash | aisocial | tempo | active |
StableEmail — Pay-per-send email delivery, forwarding inboxes, and custom subdomains — no API keys or accounts. stableemail.dev | social | tempo | active |
StableEnrich — Pay-per-request research APIs — people, companies, web search, scraping, places, social media, and contact enrichment. stableenrich.dev | datasearchsocial | tempo | active |
StablePhone — AI phone calls, dedicated phone numbers, and iMessage/FaceTime lookup — pay per request. stablephone.dev | aisocial | tempo | active |
StableSocial — Pay-per-request social media data from TikTok, Instagram, Facebook, and Reddit. stablesocial.dev | socialdata | tempo | active |
Papercut — Postcards penned by your agent. Let your agent roast and send you a digital or physical postcard. papercut.lol | aisocial | tempostripe | active |
Edges — Edges provides LinkedIn automation actions for data extraction, search, and discovery. Extract profiles, companies, posts, jobs, events, and more. Search across mpp.orthogonal.com | datasocial | tempo | active |
Influencers Club — Creator discovery, enrichment, and audience analytics across Instagram, YouTube, TikTok, Twitter, Twitch, and more. Search creators with advanced filters, enric mpp.orthogonal.com | socialdata | tempo | active |
Scrape Creators — Social media data extraction API covering 22+ platforms including TikTok, Instagram, YouTube, Twitter/X, LinkedIn, Facebook, Reddit, Pinterest, Threads, Bluesky mpp.orthogonal.com | socialdata | tempo | active |
AgentMail via Orthogonal — Programmatic email for AI agents. Create inboxes, send/receive emails, manage threads and drafts. Inboxes cost $2/month. Inboxes inactive for 30+ days are autom mpp.orthogonal.com | aisocial | tempo | active |
AgentPhone — Give your AI agent a real US/Canada phone number. Make voice calls, send and receive SMS, and hold actual conversations — all via API. Note: Outbound SMS requir mpp.orthogonal.com | social | tempo | active |
x402 vs MPP
| x402 | MPP | |
|---|---|---|
| author / steward | Coinbase → Linux Foundation | Stripe + Tempo |
| mechanism | HTTP 402 challenge, pay-per-request | IETF Payment HTTP auth, session-based |
| rails | USDC (Base, Solana, more) | USDC on Tempo, card via Visa, Lightning |
| accounts | none — wallet is identity | Stripe compliance stack built in |
| transports | HTTP | HTTP, MCP, JSON-RPC |
| compatibility | MPP is backwards-compatible with x402 — MPP clients can pay x402 services, so x402-first services reach both worlds | |
OpenSpender + MPP
The OpenSpender gateway ships x402-first (reachable by MPP clients via backwards compatibility). Native MPP endpoints — session payments, card rails, MCP transport — are on the roadmap. Protocol sources: mpp.dev · specifications.