spec/index.html at main · mppsol/spec · GitHub

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<!DOCTYPE html>
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<title>MPP.sol — Settlement layer connecting Stripe-grade payments to Solana DeFi</title>
<meta name="description" content="mppsol bridges payment intents originating in EVM L1s (Tempo, Arc, Megaeth) to atomic settlement on Solana, with on-chain Receipt PDAs proving the cross-VM flow.">
<meta property="og:title" content="MPP.sol — Settlement layer connecting Stripe-grade payments to Solana DeFi">
<meta property="og:description" content="The connector between Stripe's tradfi merchant distribution and Solana's DeFi yield distribution. On-chain primitives deployed on Solana devnet; cross-VM demo via soltempo coming in v0.2.">
<meta property="og:url" content="https://mppsol.org">
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<div class="container">

<header class="hero">
  <div class="brand">MPP.sol</div>
  <h1>Settlement layer connecting<br>Stripe-grade payments<br>to Solana DeFi.</h1>
  <p class="tag">
    Stripe brings tradfi merchant distribution. Solana brings DeFi yield distribution. <strong>mppsol is the connector</strong> — atomic on-chain settlement for payments originating in EVM contracts.
  </p>
  <div class="cta">
    <a class="btn btn-primary" href="#architecture">Architecture</a>
    <a class="btn btn-secondary" href="https://github.com/mppsol">GitHub</a>
    <a class="btn btn-secondary" href="https://github.com/mppsol/soltempo">soltempo (first consumer)</a>
    <a class="btn btn-secondary" href="spec/wire.md">Spec</a>
  </div>
  <div class="badges">
    <span>2 Anchor programs deployed on Solana devnet</span>
    <span>v0.2 cross-VM demo coming via soltempo</span>
    <span>Apache-2.0</span>
  </div>
</header>

<section id="why">
<h2>Why this exists</h2>
<p>
  <a href="https://docs.stripe.com/payments/machine/mpp">Stripe and Tempo Labs</a> shipped the Machine Payments Protocol — the IETF-draft HTTP <code>402</code> standard for machine payments. The <a href="https://github.com/solana-foundation/mpp-sdk">Solana Foundation</a> shipped <code>@solana/mpp</code> as the official Solana implementation in March 2026, covering Solana-native HTTP-402 flows in five languages.
</p>
<p>
  What neither covers: <strong>payments that originate in EVM contracts and need to settle atomically on Solana with verifiable on-chain receipts</strong>. mppsol fills that gap with on-chain Anchor programs plus a Solidity contract pattern, composed over a real cross-chain bridge (Chainlink CCIP).
</p>
<p>
  The distribution thesis: Stripe owns tradfi merchant distribution; Solana owns DeFi yield distribution. mppsol is the connector. <a href="https://github.com/mppsol/soltempo">soltempo</a> is the first concrete consumer — Solana DeFi yield account for Tempo merchants, demonstrating the thesis end-to-end.
</p>
</section>

<section id="architecture">
<h2>Architecture</h2>
<div class="ascii">   ┌──────────────────────┐
   │  Tempo / Arc / etc.  │   EVM L1 (Reth-based)
   │   Solidity contract  │   emits cross-VM settlement intent
   └──────────┬───────────┘
              │
              ▼
   ┌──────────────────────┐
   │   Chainlink CCIP     │   cross-chain message
   └──────────┬───────────┘
              │
              ▼
   ┌──────────────────────┐
   │   mppsol_cpi         │   atomically receives + settles
   │   (Solana Anchor)    │   emits Receipt PDA bound to origin
   └──────────────────────┘</div>

<div class="grid-2" style="margin-top: 32px;">
  <div class="card">
    <h3>mppsol_session</h3>
    <p>Solana Anchor program for cross-VM session payments. EVM-side payer pre-authorizes a Solana-side spending budget; off-chain debits batched and settled on-chain via Ed25519 voucher verification. <strong>Live on devnet.</strong></p>
  </div>
  <div class="card">
    <h3>mppsol_cpi</h3>
    <p>Solana Anchor program for atomic settlement. Other Solana programs CPI into it to receive cross-VM payment intents and emit Receipt PDAs that bind the settlement to its EVM origin. <strong>Live on devnet.</strong></p>
  </div>
  <div class="card">
    <h3>Tempo Solidity contract</h3>
    <p>Standardized cross-VM settlement intent emitter. Lives on Tempo (or any Reth-based EVM L1). <strong>v0.2 — coming.</strong></p>
  </div>
  <div class="card">
    <h3>CCIP integration</h3>
    <p>Bridge messaging via Chainlink CCIP — the canonical cross-chain rail Tempo activated at mainnet. <strong>v0.2 — coming.</strong></p>
  </div>
</div>
</section>

<section id="relationship">
<h2>Relationship to <code>@solana/mpp</code></h2>
<p>
  <code>@solana/mpp</code> owns Solana-native HTTP-402 payments. mppsol owns cross-VM settlement. They compose for users who need both.
</p>
<table class="status-table">
  <thead>
    <tr><th>Layer</th><th>Owner</th></tr>
  </thead>
  <tbody>
    <tr><td>HTTP 402 wire protocol on Solana</td><td><code>@solana/mpp</code> (Foundation)</td></tr>
    <tr><td>Solana payment session SDK</td><td><code>@solana/mpp</code></td></tr>
    <tr><td><strong>Cross-VM settlement (EVM ↔ Solana)</strong></td><td><strong>mppsol</strong></td></tr>
    <tr><td>Cross-chain messaging</td><td><a href="https://chain.link/cross-chain">Chainlink CCIP</a></td></tr>
  </tbody>
</table>
<p style="margin-top: 18px;">
  mppsol does not depend on <code>@solana/mpp</code> at v0.1 (on-chain Anchor programs only — no npm dependency surface). A v0.2 TS SDK will depend on it (pinned exact version, types wrapped) where the cross-VM flow needs HTTP-402 composition.
</p>
</section>

<section id="status">
<h2>v0.1 status — honest scorecard</h2>
<table class="status-table">
  <thead>
    <tr><th>Capability</th><th>Status</th><th>Notes</th></tr>
  </thead>
  <tbody>
    <tr><td><code>mppsol_session</code> Anchor program</td><td class="ok">✓ on devnet</td><td>PDA escrow, Ed25519 batched settle, Open/Settle/Topup/Revoke/Close lifecycle</td></tr>
    <tr><td><code>mppsol_cpi</code> Anchor program</td><td class="ok">✓ on devnet</td><td>Atomic settlement + Receipt PDA emission</td></tr>
    <tr><td>Anchor tests</td><td class="ok">✓ 12 passing</td><td>Localnet integration suite</td></tr>
    <tr><td>Spec documents</td><td class="pending">⚠ being rewritten</td><td>Currently HTTP-402-era; cross-VM rewrite in progress</td></tr>
    <tr><td>Tempo Solidity contracts</td><td class="pending">⏳ planned v0.2</td><td>Standardized cross-VM intent emitter</td></tr>
    <tr><td>Chainlink CCIP integration</td><td class="pending">⏳ planned v0.2</td><td>Bridge messaging layer</td></tr>
    <tr><td>End-to-end cross-VM demo</td><td class="pending">⏳ planned v0.2</td><td>Via <a href="https://github.com/mppsol/soltempo">soltempo</a></td></tr>
    <tr><td><code>@mppsol/core</code>, <code>/server</code>, <code>/agent</code> npm packages</td><td class="pending">⚠ deprecated</td><td>Use <code>@solana/mpp</code>. Packages remain published at <code>0.1.0-draft.4</code> for existing consumers.</td></tr>
    <tr><td>Mainnet Anchor deployment</td><td class="pending">⏳ pending</td><td>Audit + multisig transition of upgrade authority</td></tr>
  </tbody>
</table>
</section>

<section id="onchain">
<h2>On-chain (Solana devnet)</h2>
<table class="status-table">
  <thead>
    <tr><th>Program</th><th>ID</th></tr>
  </thead>
  <tbody>
    <tr>
      <td><code>mppsol_session</code></td>
      <td><a href="https://explorer.solana.com/address/B7joeuXqPJSCTfUfMacHaWL6eseoDinV7Jxt52gVdfbi?cluster=devnet"><code>B7joeuXq...VdfbI</code></a></td>
    </tr>
    <tr>
      <td><code>mppsol_cpi</code></td>
      <td><a href="https://explorer.solana.com/address/624xoctSeGzq1TAVwZU1xbM9RozAd3xZmjPeFXrAY14j?cluster=devnet"><code>624xocts...AY14j</code></a></td>
    </tr>
    <tr>
      <td><code>test_consumer</code> <span class="tag-pill">test-only</span></td>
      <td><a href="https://explorer.solana.com/address/65ndFCiYYM3tznTg5Te1x8ALfVP7SxFEwvvUeANYy3Ex?cluster=devnet"><code>65ndFCiY...y3Ex</code></a></td>
    </tr>
  </tbody>
</table>
<p style="margin-top: 14px; font-size: 0.9em;">IDLs are uploaded on-chain — fetch via <code>Program.fetchIdl(programId, provider)</code>.</p>
</section>

<section id="repos">
<h2>Repositories</h2>
<table class="status-table">
  <thead>
    <tr><th>Repo</th><th>What it is</th><th>Status</th></tr>
  </thead>
  <tbody>
    <tr>
      <td><a href="https://github.com/mppsol/spec"><code>mppsol/spec</code></a></td>
      <td>This repo — cross-VM settlement spec + landing site at mppsol.org</td>
      <td class="ok">active</td>
    </tr>
    <tr>
      <td><a href="https://github.com/mppsol/cpi"><code>mppsol/cpi</code></a></td>
      <td>Two Anchor programs deployed on devnet</td>
      <td class="ok">active</td>
    </tr>
    <tr>
      <td><a href="https://github.com/mppsol/soltempo"><code>mppsol/soltempo</code></a></td>
      <td>First consumer — Solana DeFi yield account for Tempo merchants</td>
      <td class="ok">scaffolded · v0.1 in build</td>
    </tr>
    <tr>
      <td><a href="https://github.com/mppsol/sdk"><code>mppsol/sdk</code></a></td>
      <td>TS packages — use <code>@solana/mpp</code> instead</td>
      <td class="pending">deprecated</td>
    </tr>
  </tbody>
</table>
</section>

<section id="links">
<h2>Spec docs</h2>
<p style="margin-bottom: 18px; font-size: 0.95em;">
  <em>The v0.1 specs were written for the HTTP-402-on-Solana framing and are being migrated to match the cross-VM positioning. Treat current content as historical reference until the rewrite ships.</em>
</p>
<div class="grid-2">
  <a class="card" href="spec/wire.md"><h3>wire.md</h3><p>HTTP header format, both settlement schemes, Ed25519 signing.</p></a>
  <a class="card" href="spec/session.md"><h3>session.md</h3><p>On-chain session program: PDA layout, instruction set, lifecycle.</p></a>
  <a class="card" href="spec/cpi.md"><h3>cpi.md</h3><p>CPI primitive design + v0.1 implementation notes.</p></a>
  <a class="card" href="spec/settlement.md"><h3>settlement.md</h3><p>Operator guidance: confirmation levels, batching, Token-2022.</p></a>
  <a class="card" href="spec/security.md"><h3>security.md</h3><p>Threat model, replay protection, cluster confusion attacks.</p></a>
</div>
</section>

<footer>
  <p>
    Maintained by <a href="https://github.com/psyto">psyto</a> ·
    Apache-2.0 ·
    <a href="https://github.com/mppsol">github.com/mppsol</a>
  </p>
</footer>

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