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 PayRPC is being built to speak both standards.
141
mpp services indexed
141
active
9
top categories
tempo · stripe
payment methods
22 matching
| service | categories | payment methods | status |
|---|---|---|---|
Apex DB — Search normalized vehicle variants, specifications, emissions, and source-linked provenance from public automotive datasets. api.apex-db.org | datasearch | tempo | active |
RxAtlas — Search normalized US drug products with source-linked FDA, DailyMed, RxNorm, NADAC, shortage, and enforcement enrichments. api.rxatlas.dev | datasearch | tempo | active |
TrialBase DB — Search normalized clinical trials from ClinicalTrials.gov, CTIS, EudraCT, and ISRCTN with registry identifiers and source-linked evidence. api.trialbase-db.org | datasearch | tempo | active |
RecallRadar — Search normalized consumer-product safety notices from six public authorities with recall classification, hazards, remedies, and provenance. api.recallradar.dev | datasearch | tempo | active |
Browserbase — Headless browser sessions, web search, and page fetching for AI agents. mpp.browserbase.com | webcomputesearch | tempostripe | active |
Exa — Neural web search and page-content retrieval for AI agents, paid per request with no API key. api.exa.ai | searchai | tempo | active |
GovLaws — Current U.S. federal regulation lookup, semantic search, and change tracking with provenance-rich responses from official government sources. govlaws.ai | datasearch | tempo | active |
Parallel — Web search, page extraction, and multi-hop web research. parallelmpp.dev | searchai | tempo | active |
StableEnrich — Pay-per-request research APIs — people, companies, web search, scraping, places, social media, and contact enrichment. stableenrich.dev | datasearchsocial | tempo | active |
SpyFu — Competitor keyword research — SEO rankings, PPC ads, ad history, and domain analytics. 18+ years of historical data. spyfu.mpp.tempo.xyz | datasearch | tempo | active |
SerpApi — Google Flights search — real-time prices, schedules, and booking options. serpapi.mpp.tempo.xyz | searchdata | tempo | active |
Brave Search — Independent web search — web, news, images, videos, AI answers, and LLM context. Privacy-first search from a large independent index. brave.mpp.paywithlocus.com | search | tempo | active |
Perplexity — AI-powered search — Sonar chat with real-time web grounding, web search, and embeddings. perplexity.mpp.paywithlocus.com | aisearch | tempo | active |
Tako — Data visualization and research platform. Search datasets, generate charts, and build research reports with AI. tako.com | datasearchai | stripe | active |
Tavily — AI-optimized web search, content extraction, site mapping, and crawling API. tavily.mpp.paywithlocus.com | searchweb | tempo | active |
Seltz — Context-engineered web search API. Search the web and return matching documents with full content. mpp.orthogonal.com | searchweb | tempo | active |
Tavily API — Real-time search, extraction, and web crawling through a single, secure API. mpp.orthogonal.com | searchweb | tempo | active |
Olostep API — Olostep offers AI a way to search the web, extract structured data in real time and build custom research agents. mpp.orthogonal.com | websearch | tempo | active |
Linkup API — Linkup is a web search engine for AI apps. We connect your AI application to the internet. Our API provides grounding data to enrich your AI’s output and increa mpp.orthogonal.com | searchweb | tempo | active |
Tako via Orthogonal — Tako is a knowledge search engine that visualizes the world's data. Search with natural language to get interactive knowledge cards with charts, tables, and ins mpp.orthogonal.com | searchdata | tempo | active |
Andi Search API — AI Search for the Next Generation mpp.orthogonal.com | searchai | tempo | active |
Serper — Google Search API by Serper - fast, reliable access to 12 Google search types: web search, images, videos, news, places, maps, shopping, scholar, patents, autoc mpp.orthogonal.com | searchweb | 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 | |
PayRPC + MPP
The PayRPC 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.