cryon
3.4K posts

cryon
@cryonct
do doo da, doo doo doo doo da | prev. community and growth @Talus_labs
london Katılım Şubat 2023
4.1K Takip Edilen1.6K Takipçiler

MPP myths
"MPP only works with Tempo"
No. It's payment method agnostic — works with crypto and fiat, any chain. It's already been extended to Bitcoin Lightning; there's a draft extension for Solana.
"It costs 1.5% to use"
No inherent cost to using MPP. Individual payment methods may charge fees, but that's no different than today. Blockchains have different fees. Fiat methods have different fees.
"It's less open"
MPP launched with 4 payment methods on Day 1: Tempo (stablecoins), Stripe (various payment methods), Visa (cards broadly), and Lightspark (Bitcoin Lightning). Visa and Lightspark were each able to extend MPP in a matter of days. MPP does not have a complicated foundation structure — it's designed to be simple and extensible by anyone. It's also been submitted to the IETF as a web standard.
"It's session based vs. pay-per-request"
MPP supports both. The most basic version is pay-per-request. Sessions (payment channels) are useful when you want many small payments in succession at the speed of APIs, not blockchains. Fewer API round trips also means MPP is faster in practice.
"MPP is specifically designed for Tempo / Stripe"
It's designed to be as simple as possible. No complicated facilitator. No assumptions about specific smart wallet implementations, stablecoins, or chains. It separates secure HTTP communication from the payment rail. That's why Visa and Lightspark could extend it so quickly.

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X402 VS Stripe MPP: 3 Key diferences
Two AI agent payment protocols solving same problem but very different bets.
1. What currencies they support
> x402: Stablecoins only, primarily $USDC. Designed for sub-cent crypto micropayments at internet speed.
> MPP: stablecoins and fiat. Cards, wallets, BNPL. @Visa extended it for card-based payments. @lightspark extended it for Bitcoin Lightning.
2. How a payment actually works
> x402: Agent hits a paywall, server returns 402 with payment details, agent pays in USDC, gets access. Entire flow inside one HTTP request. No human in the loop.
> MPP: Agent requests a service, protocol negotiates payment method and amount, settles in stablecoin or fiat depending on what the merchant accepts.
Also supports sessions, continuous payments for ongoing agent work, not just one-off transactions.
3. The core philosophical difference
> x402 bets that crypto becomes the default payment layer for the open web. The protocol is intentionally simple, open, and chain-agnostic.
> MPP bets that whoever controls the existing payment rails wins. Stripe already processed $1.9 trillion in 2025. MPP is an extension of that infrastructure into the agentic economy.
4. What this actually means
> x402 is the path where crypto wins by becoming invisible infrastructure.
> MPP is the path where traditional finance absorbs crypto and AI agents transact on Stripe's rails like everyone else already does.
The protocol that gets default developer adoption defines how the agentic economy moves money.

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10/ i broke down both protocols side by side. how they work, where they diverge, and what matters depending on what you're building.
cryon.work/articles/x402-…
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9/ three questions that decide which one you use:
do your agents need fiat? MPP has native Stripe support on day one. x402 V2 supports it via facilitators but Stripe's integration is more mature.
high-frequency calls to the same service? MPP Sessions are purpose-built for this. x402 V2 has wallet-based sessions too but MPP's escrow contracts and streaming are further along.
permissionless web3 ecosystem? x402 is cleaner, simpler, and multi-chain out of the box.
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