LupaRiel · MPP

English · rail hub · pay-per-request · 179 entries · snapshot 2026-10-31 · reviewed 2026-10-31

MPP

Machine Payments Protocol (Stripe + Tempo): HTTP 402 so an agent can pay for APIs, tool calls, and content.

What it is. HTTP 402 for machine-to-machine payments on APIs, tool calls, and content. No checkout UI. Source: research/mpp.md (180 rows, snapshot 2026-10-31, last reviewed 2026-10-31).

Who maintains it. Co-authored by Stripe and Tempo. Docs and service directory at mpp.dev.

What it is not. Stripe’s closest rail to x402. Not AP2 or ACP.

Note. If an MPP row mentions x402 in prose but is not in the x402 table, the second rail is not invented. Price and network only when the table publishes them.

Price, network, and status only when the table has them. Compare rails: x402 vs AP2 vs ACP vs MPP · PAP. Full MPP table (Spanish): /mpp/. All listings A–Z: /en/directory/.

Official docs

• mpp.dev

Methodology

• How LupaRiel verifies entries
• On rail hubs, the status is the one on that rail. On the home page and the Index, the most advanced among its rails.
• Machine-readable catalog · /rieles.json
• Spanish hub + full listing · /mpp/

Protocol updates

• 2026-10-31. x402 + MPP in the same 402 counter: up to 34 unique sellers (tempo 25, evm 10, stripe 3, solana 2, a seller can offer several methods). Oblique Markets (tempo method), Laso Finance (evm method on Base, same recipient as its payTo) and HubVibe join, the latter being the third seller with Stripe and also offering tempo and evm. mpp.dev reaches 139 services with Code Storage, repo storage that gets no ficha because it is generic protocol infrastructure. mpp-specs PR #389 proposes that sellers can require attestations (age, KYC, sanctions) before settling. tempoxyz/mpp closed #1079 and #1085 without merging and mppx stays at 0.17.0. ZeroClick charges with a different wallet per rail (ForwardLane and Driftflight), which is expected for a paid proxy. Oblique Markets ficha · Laso Finance ficha · HubVibe ficha · mpp-specs PR #389 · mpp.dev · services
• 2026-10-30. x402 + MPP in the same 402 counter: up to 31 unique sellers (tempo 23, evm 8, stripe 2, solana 2, a seller can offer several methods). ForwardLane and SchemaSure join (tempo method, new fichas), plus StableSocial, an MPP ficha whose same 402 also carries x402 v2 on Base and Solana and which now adds the x402 rail to the catalog. SolEnrich advertises MPP in its llms.txt but its 402 carries no MPP challenge, so it does not count. mppx 0.17.0 shipped on 2026-10-29 with a breaking change in mppx/identity. tempoxyz/mpp merged #1133 and closed #1081 and #1083 without merging. mpp.dev still lists 138 services. ForwardLane ficha · SchemaSure ficha · StableSocial ficha · mppx 0.17.0 · tempoxyz/mpp #1133 · mpp.dev · services
• 2026-10-29. x402 + MPP in the same 402: up to 28 unique sellers (tempo 20, evm 8, stripe 2, solana 2, since one seller can offer several methods). Added: Driftflight (agents.driftflight.com), with the tempo method and a recipient different from its x402 payTo, Arysphere DAO Proposal Preview (api.arysphere.com), with the tempo method and the same recipient, and 47620 Solana Data API (47620.xyz), with the solana method. Stablecoin Gateways Merchant Check is not counted because its xrpl MPP is testnet only. mppx 0.16.0 replaces attestation with per-route identity (mppx/identity), a breaking change. tempoxyz/mpp documents paying with an existing Stripe SPT (#1136) and names Tempo and Stripe as co-authors (#1125). mpp.dev stays at 138 services. Driftflight ficha · 47620 Solana Data API ficha · Arysphere DAO Proposal Preview ficha · mppx 0.16.0 · tempoxyz/mpp PR #1136 · tempoxyz/mpp PR #1125
• 2026-10-28. x402 + MPP in the same 402: up to 25 unique sellers (tempo 18, evm 8, stripe 2, solana 1, since one seller can offer several methods). Added: Retriever AI (agents.rtrvr.ai) and WithZero (agents.withzero.xyz), with the tempo method and a recipient different from their x402 payTo, and SCVD General Store (scvd.store), with the evm method on Base and the same recipient. Tavily and Telnyx were already listed for MPP through a proxy and now also charge with x402 in their own 402, which carries no MPP, so they are not counted. tempoxyz/mpp merges on 2026-10-28 the generation of proxy services from the proxy's discovery manifest (#1132). Retriever AI ficha · WithZero ficha · SCVD General Store ficha · tempoxyz/mpp PR #1132
• 2026-10-27. x402 + MPP in the same 402: up to 22 unique sellers (tempo 16, evm 7, stripe 2, solana 1, since one seller can offer several methods). PredictLeads (agents.predictleads.com) joins with the tempo method and a recipient different from its x402 payTo, and so does JAW.id ENS Reverse Resolver (api.justaname.id), with the evm method on Base and the same recipient. mpp-specs merges problem type URIs on 2026-10-26 (#384), and the session intent (#387) is still open. tempoxyz/mpp syncs its docs with mppx 0.15.0 (#1124). mpp.dev stays at 138 services. PredictLeads ficha · JAW.id ficha · mpp-specs PR #384 · tempoxyz/mpp PR #1124
• 2026-10-26. x402 + MPP in the same 402: up to 20 unique sellers (tempo 15, evm 6, stripe 2, solana 1, since one seller can offer several methods). AgentFeed (x402.ochinimus.app) joins, sending the MPP tempo method (chainId 4217) and, on /api/sol-price, the solana method. In mpp-specs, 11 PRs were closed without merge on 2026-10-25, including payment methods for Nano, Gloam, picocash, Tenzro and initia, on the grounds that those networks are too small for the official spec. The tempoxyz/mpp catalog no longer takes listings by PR and asks to register each service on MPPScan. mpp.dev stays at 138 services and mppx at 0.15.0. AgentFeed ficha · mpp-specs PR #377 (closed) · tempoxyz/mpp PR #1063 (closed) · MPPScan · register
• 2026-10-25. mpp-specs merges the Solana subscription intent as a draft (PR #310, 2026-10-24): each renewal is one transfer of the full amount per period, the plan lives on-chain and programId is required, with a puller, expiry and cancellation, and the receipt reports the billed period. mppx stays at 0.15.0, with open fix PRs for Tempo sessions (#1097, #1099 and #1101). The x402 + MPP counter stays at 19 unique sellers. mpp-specs PR #310 · mppx · open PRs
• 2026-10-23. x402 + MPP in the same 402: up to 19 unique sellers with Tanod (tanod.dev, tempo method, chainId 4217, 0.001 USDC), WebberSites x402 Data API (api.webbersites.com, evm method on Base, 0.01 USDC), and PreReason (api.prereason.com, evm method on Base, 0.05 USDC). All three send the MPP challenge next to x402 v2, with the same recipient as their payTo. Penny Press / Scribed's `Payment method="x402"` repeats the x402 request and Tanod's L402 is Lightning: neither is MPP. By method: Tempo 14, evm 6, and Stripe 2. Tanod ficha · WebberSites x402 Data API ficha · PreReason ficha · Penny Press / Scribed ficha
• 2026-10-23. UnyKorn Genesis402 (twin.unykorn.org): its two challenges with method="usdc" (Base and Polygon) are not an mpp-specs method, they are non-standard challenges. They do not change the counter: the seller counts once, through the evm challenge. UnyKorn Genesis402 ficha
• 2026-10-22. x402 + MPP in the same 402: up to 16 unique sellers with UnyKorn Genesis402 (twin.unykorn.org), which sends an MPP challenge with the evm method on Base (chainId 8453, 0.003 USDC) next to x402 v2, with the same recipient. Its 402 also carries two challenges with method="usdc", which is not an mpp-specs method: it counts through the evm challenge. By method: Tempo 13, evm 4, and Stripe 2. UnyKorn Genesis402 ficha
• 2026-10-22. mppx 0.15.0 (minor, 2026-10-21 17:46 ART): a batch of security fixes. It closes an implicit TLS bypass for local hostnames, claim replays across expiry, and WebSocket charges at stale challenge prices. Standalone credential APIs now require a configured realm or trusted route context, and the CLI no longer pays with --insecure. If the challenge expires during settlement, it keeps the charge receipt so it does not ask for a second payment. The spec did not change. GitHub · mppx 0.15.0
• 2026-10-21. x402 + MPP in the same 402: still 15 unique sellers, none added on 2026-10-21. You.com: the recipient of its MPP Tempo challenge changes on every 402 (three back-to-back probes gave three addresses), so it is a per-charge deposit address, not a wallet change. Its x402 payTo did not change. dTelecom stays out of the counter, with x402 and MPP on separate routes: today its MPP route answers 400 without payment because it asks for the amount (amount_usd, minimum US$0.1) and the wallet in the body, and we did not complete a purchase to reproduce the 402. Stock Trends advertises session-based MPP outside the 402 and TraceFast, despite its mpp subdomain, only sends x402: neither joins the counter. LupaRiel probe 2026-10-21. You.com Search ficha · dTelecom ficha
• 2026-10-21. mppx 0.14.0 (minor) and 0.14.1 (patch), 2026-10-21: the Tempo session server adds accounting primitives so payment servers no longer edit channel records by hand. charge() accepts an idempotencyKey (a retry with the same key and amount returns the recorded charge without charging again) and a new credit() returns an amount to the channel at most once per key. Breaking: settle() settles the largest accepted voucher at or below what was spent and no longer captures one above it. It adds superviseCloses() for a scheduled job that answers close requests and finalizes channels, and sponsorshipLimit, up to 5 sponsored opens per signer per UTC day. 0.14.1 can settle on a schedule without waiting for a close. The MPP spec did not change. GitHub · mppx 0.14.0 · GitHub · mppx 0.14.1
• 2026-10-20. Affiliate.com via ZeroClick and Losbeto join the sellers that send x402 plus an MPP challenge with any method (Tempo, evm, or Stripe) in one single 402 response. That makes 15 unique sellers, each with the MPP method seen in its 402: Zumpay (Tempo), wtsp.dev (Tempo), ProviderSignal (Stripe), Neynar (Tempo), geo402 (Tempo), x402stock (Tempo, on agents.x402stock.xyz), You.com (Tempo), OneSource (Tempo, with charge and session intents), Stacktree (Tempo on agents.stacktr.ee, evm and Stripe on api.stacktr.ee), StableEnrich (Tempo), Delx (Tempo), OpenVerbs (Tempo and evm), agdata (evm), Affiliate.com (Tempo), and Losbeto (Tempo). Breakdown by method: Tempo 13, evm 3, and Stripe 2 (a seller can offer more than one method). Stacktree added a Stripe challenge on api.stacktr.ee today. Affiliate.com charges US$0.02 to list the merchants behind its product catalog and Losbeto US$0.012 for a commodity price, both with a different wallet on the MPP rail. dTelecom is left out of the counter: x402 and MPP on separate routes. On 2026-10-20 its MPP route answered 402 with amount 0. LupaRiel probe 2026-10-20. Affiliate.com via ZeroClick ficha · Losbeto Market Intelligence ficha
• 2026-10-20. mppx 0.13.6 (patch, 2026-10-20): Tempo charges add an autoSwap.fallback option, which with fallback set to false only uses tokenIn as an allowlist, and OUSD joins the default auto-swap currencies after pathUSD and USDC. It also fixes auto-swap for access keys whose authorization was not yet published and bounds session management POSTs to 30 seconds. The MPP spec did not change. GitHub · mppx 0.13.6 · npm · mppx
• 2026-10-19. Ecosystem health, per an external source: Fizzl (fizzl.eu) published its daily check of paid endpoints in October 2026. On 17 October 2026, 50,373 endpoints answered, 49,955 x402 and 418 MPP. 93.1% were payable as advertised and 2.1% should not be paid. A single seller, datapackvibe.com, holds 41% of payable endpoints and the 10 largest hold 60%, so 61,860 endpoints are about 25,273 distinct services. Base is on 97% of payable endpoints, Tempo on 6%, and Arc on 4%. Median price US$0.01 per call. The most common error is a 402 that names a different URL than the one called (2,009 endpoints). These are Fizzl's figures, not a LupaRiel measurement. Source checked on 2026-10-19. Fizzl · We check 50,000 paid x402 endpoints every day (October 2026)
• 2026-10-19. There are now 13 sellers with x402 and an MPP challenge in one single 402 response. The rule counts any MPP method: Tempo, evm, or Stripe. New: StableEnrich (US$0.05), Delx Commerce (US$0.01), OpenVerbs SEO (US$0.03), and agdata (US$0.024), all four with the same wallet on both rails. MPP method seen in each seller's 402: Zumpay (Tempo), wtsp.dev (Tempo), ProviderSignal (Stripe), Neynar (Tempo), geo402 (Tempo), x402stock (Tempo, on agents.x402stock.xyz), You.com (Tempo), OneSource (Tempo, with charge and session intents), Stacktree (Tempo on agents.stacktr.ee and evm on api.stacktr.ee), StableEnrich (Tempo), Delx (Tempo), OpenVerbs (Tempo and evm), and agdata (evm). dTelecom is left out of the counter: x402 and MPP on separate routes (POST /v1/credits/purchase charges x402 and /v1/credits/purchase/mpp sends Tempo). LupaRiel probe 2026-10-19. StableEnrich ficha · Delx Commerce ficha · OpenVerbs SEO ficha · agdata ficha · tempoxyz/mpp-specs · evm method
• 2026-10-18. Eighth, ninth, and tenth sellers with x402 and MPP in the same 402: You.com Search (US$0.005 via x402 and US$0.01 via MPP Tempo, chainId 4217), OneSource (US$0.001, with charge and escrow-backed session intents), and Stacktree (US$0.50 to publish, MPP Tempo on agents.stacktr.ee/api/publish with the same recipient as its x402). You.com and OneSource use a different wallet on the MPP rail. LupaRiel probe 2026-10-18. You.com Search ficha · OneSource ficha · Stacktree publish ficha
• 2026-10-17. Seventh seller with x402 and MPP in the same 402: x402stock (agents.x402stock.xyz) sends an MPP Tempo challenge (US$0.02, chainId 4217) alongside its x402 v2 402. Its llms.txt points MPP clients to that host. LupaRiel probe 2026-10-17. x402stock ficha · x402stock · llms.txt
• 2026-10-16. Two more x402 sellers also charge via MPP in the same 402: Neynar API (US$0.01, tempo method, chainId 4217, same receiving wallet as its x402 v1) and geo402 (US$0.01, tempo method, plus Tempo inside its x402 accepts). The x402 + MPP pattern reaches 6 sellers: dTelecom, Zumpay, wtsp.dev, ProviderSignal, Neynar, and geo402. LupaRiel probe 2026-10-16. Neynar API ficha · geo402 ficha
• 2026-10-11. Three new x402 APIs also charge via MPP in the same 402: Zumpay Arc Liquidity API and wtsp.dev with the Tempo method (chainId 4217), and ProviderSignal with the Stripe method (card or Link; $0.50, Stripe's card minimum). Same pattern as dTelecom. LupaRiel re-probe 2026-10-11. Zumpay ficha · wtsp.dev ficha · ProviderSignal ficha
• 2026-10. Stripe lists MPP on Solana (USDC) in addition to Tempo (USDC.e); x402 is Base (USDC) only. First MPP-on-Solana entry in the research. Stablecoins are available to businesses in all U.S. states except New York; outside the U.S., on request in 30+ countries. The docs don't date the change (checked 2026-10-10). Stripe docs · Machine payments
• 2026-10-09. Multi-protocol seller example: dTelecom Agent Session Gateway charges for credit purchases via MPP (WWW-Authenticate: Payment challenge, tempo method, chainId 4217) and, on the same gateway, via x402. LupaRiel re-probe 2026-10-09. dTelecom ficha · x402.dtelecom.org/.well-known/x402

Protocol updates with a cited source. They are not catalog rows and do not change the snapshot.

Sample entries

• Anthropic · production · 2026-10-31
• OpenAI · production · 2026-10-31
• Browserbase · production · 2026-10-31

These names come from the research tables (snapshot 2026-10-31). LupaRiel does not invent rows, prices, networks, or statuses. The complete listing stays on the Spanish hub.

MPP comparison table

All 179 entries on this rail with domain, price, network, Rail Readiness Level (RRL) and the status on this rail. Ordered by RRL, then status and name. Same rows as the CSV and JSON downloads.

MPP: name, domain, price, network, RRL and rail status for 179 entries

Name	Domain	Price (table)	Network	RRL	Status
Affiliate.com vía ZeroClick (zeroclick.affiliate.com)	zeroclick.affiliate.com	$0.02 (v1/merchants)	MPP (Tempo)	3	production
agdata (agdata.shveik.dev)	agdata.shveik.dev	$0.024 (youtube-transcript)	MPP (evm, Base)	3	production
Exa	exa.ai	$0.007–$0.015 por búsqueda	Tempo (USDC)	3	production
HubVibe (hubvibe-io.com)	hubvibe-io.com	$0.10 (work/email/verify). Recarga Stripe de $0.50	MPP (Stripe, Tempo y evm)	3	production
JAW.id ENS Reverse Resolver (api.justaname.id)	api.justaname.id	$0.005 (ens/v2/reverse)	MPP (evm, Base)	3	production
Laso Finance (laso.finance)	laso.finance	$0.001 (/auth)	MPP (evm, Base)	3	production
OneSource	api.onesource.io	$0.001 (chain-id)	MPP (Tempo)	3	production
OpenVerbs SEO (seo.openverbs.com)	seo.openverbs.com	$0.03 (search-intent)	MPP (Tempo y evm en Base)	3	production
PreReason (api.prereason.com)	api.prereason.com	$0.05 (api/cross/regime)	MPP (evm, Base)	3	production
SCVD General Store (scvd.store)	scvd.store	$0.001 (spot_check)	MPP (evm, Base)	3	production
StableEnrich (stableenrich.dev)	stableenrich.dev	$0.05 (place-details/full)	MPP (Tempo)	3	production
StableSocial	stablesocial.dev	$0.06 (sc/instagram/user/reels)	MPP nativo	3	production
StableTravel	stabletravel.dev	Por solicitud	MPP nativo	3	production
Stacktree publish (api.stacktr.ee)	agents.stacktr.ee	$0.50 (publish)	MPP (Tempo)	3	production
UnyKorn Genesis402 (twin.unykorn.org)	twin.unykorn.org	$0.003 (price/bitcoin)	MPP (evm, Base)	3	production
WebberSites x402 Data API (api.webbersites.com)	api.webbersites.com	$0.01 (api/a11y/check)	MPP (evm, Base)	3	production
47620 Solana Data API (47620.xyz)	47620.xyz	$0.01 (x/x402/stats)	MPP (Solana)	2	production
AgentFeed	x402.ochinimus.app	$0.001 (api/price)	MPP (Tempo y Solana)	2	production
AgentMail	agentmail.to	$2.00 por buzón creado	Tempo (USDC)	2	production
Allium	allium.so	$0.02 por solicitud	Tempo (USDC)	2	production
Anthropic	anthropic.com	Dinámico según modelo	Tempo (USDC)	2	production
Apex DB	apex-db.org	$0.10 por solicitud / $0.025 por registro	Tempo (USDC)	2	production
Arysphere DAO Proposal Preview (api.arysphere.com)	api.arysphere.com	$0.002 (dao_proposal_preview)	MPP (Tempo)	2	production
Delx Commerce (api.delx.ai)	api.delx.ai	$0.01 (robots-inspect)	MPP (Tempo)	2	production
DNS WHOIS and RDAP Lookup (Pocket Network)	agent.pocket.network	$0.005 por solicitud	MPP (vía Pocket Network, gateway indexado en 402 Index)	2	production
Doma	mpp.doma.xyz	not listed	MPP nativo	2	production
Driftflight (agents.driftflight.com)	agents.driftflight.com	$0.06 (images/generate)	MPP (Tempo)	2	production
Dune	dune.com	Variable	MPP (proxy Tempo)	2	production
ForwardLane (agents.forwardlane.com)	agents.forwardlane.com	$0.02 (api/functions)	MPP (Tempo)	2	production
geo402 (geo402.alogos.xyz)	geo402.alogos.xyz	$0.01 (timezone). $0.02 geocode/IP	MPP (Tempo)	2	production
Losbeto Market Intelligence (api.losbeto.xyz)	api.losbeto.xyz	$0.012 (commodity-price)	MPP (Tempo)	2	production
Modal	modal.com	Variable	MPP nativo	2	production
Neynar API (api.neynar.com)	api.neynar.com	$0.01/consulta	MPP (Tempo)	2	production
Oblique Markets (api.oblique.markets)	api.oblique.markets	$0.002 (base-block-number)	MPP (Tempo)	2	production
OpenAI	openai.com	Dinámico según modelo	Tempo (USDC)	2	production
Pinata IPFS	pinata.cloud	$0.01 por descarga; carga desde $0.01 (dinámico según tamaño, ~$0.10/GB/mes)	MPP (USDC en Tempo)	2	production
PredictLeads (agents.predictleads.com)	agents.predictleads.com	$0.12 (technologies)	MPP (Tempo)	2	production
ProviderSignal	providersignal.com	$0.50–$1.00	MPP (Stripe, tarjeta/Link)	2	production
RecallRadar	recallradar.dev	$0.10 por solicitud	Tempo (USDC)	2	production
Retriever AI (agents.rtrvr.ai)	agents.rtrvr.ai	$0.05 (scrape)	MPP (Tempo)	2	production
RxAtlas	rxatlas.dev	$0.10 por solicitud	Tempo (USDC)	2	production
SchemaSure (schemasure.com)	schemasure.com	$0.06 (v2/extract-image)	MPP (Tempo)	2	production
StablePhone	stablephone.dev	Variable	MPP nativo	2	production
Tanod (tanod.dev)	tanod.dev	$0.001 (v1/fx)	MPP (Tempo)	2	production
Trade and Tariff Data (Pocket Network)	agent.pocket.network	$0.005 por solicitud	MPP (vía Pocket Network, gateway indexado en 402 Index)	2	production
TrialBase DB	trialbase-db.org	$0.10 por solicitud	Tempo (USDC)	2	production
WithZero (agents.withzero.xyz)	agents.withzero.xyz	$0.06 (pipe0/company/search)	MPP (Tempo)	2	production
wtsp.dev	wtsp.dev	$0.004–$0.01	MPP (Tempo)	2	production
x402stock	agents.x402stock.xyz	$0.02 (fear-greed). $0.01–$0.75	MPP (Tempo)	2	production
You.com Search (api.you.com)	api.you.com	$0.01 por MPP (search). $0.005 por x402	MPP (Tempo)	2	production

Show all 179 entries Showing 50 of 179. The CSV and JSON have every row.

Download the comparison

179 MPP entries · name, domain, price, network, rail status and RRL · snapshot 2026-10-31.

• RRL 3 16
• RRL 2 35
• RRL 1 97
• RRL 0 31

CSV · /rieles/mpp.csv JSON · /rieles/mpp.json

160 of 179 list a price and 179 a network in the rail table. Empty = the table does not list it.

License CC BY 4.0. Cite LupaRiel and the snapshot date. RRL methodology.