The Machine-Readable Rights Layer for AI

Your Content.
Your Terms.
Enforced by Code.

Sello is the MIT License for AI content — one <meta name="sello"> tag that tells every AI agent what it can do with your work, and collects automatic USDC micropayments when they comply.

I'm a CreatorI'm an AI Developer
5License types
x402Payment standard
SolanaOn-chain proof
Protocol Flow

How Sello Works

From article to AI payment in three steps. No SDK, no API key, no agreement. Just a tag in your HTML.

01

Add the Tag

Paste one meta tag in your article's <head>. Declares license, price, and your Solana address.

<meta name="sello" content="license:sello-voice| pay:https://server/narrate| price_usdc:0.10| onchain:solana:devnet:...">
02

AI Detects & Pays

Any AI agent that reads your content checks the Sello tag. If it wants to narrate, it triggers an x402 USDC micropayment automatically.

// AI agent flow GET article → parse <meta name="sello"> if (license === "sello-voice") { POST /narrate + x402 USDC payment }
03

Recorded On-Chain

Every usage is logged on Solana devnet as an immutable UsageReceipt. Legal proof of consent. Fire-and-forget.

// Solana PDA ["sello", author, content_hash] → ContentSello account → UsageReceipt account amount_paid: 100000 // $0.10 USDC
For Creators

Define Your
AI Terms

  • ⬡

    One meta tag. Machine-readable license that every AI agent respects.

  • $

    Automatic USDC micropayments via x402 — no invoices, no chasing.

  • ◈

    Immutable proof of authorship on Solana devnet. Legal paper trail.

  • §

    Covered under EU CDSM Art. 4 TDM reservation.

Seal My Content
For AI Developers

Access Licensed
AI-Ready Content

  • ⬡

    Detect Sello tags in any HTML. Instant knowledge of what you can do.

  • $

    Pay-per-use via x402. No contracts, no negotiations, no legal risk.

  • ◈

    Sello Skill works in Claude Code, Codex, Gemini CLI out of the box.

  • §

    Cross-chain: arrive with USDC from any chain via LI.FI bridge.

Setup My Agent
Pre-Defined Licenses

5 Licenses.
Zero Lawyers.

Like Creative Commons, but for AI agents. Machine-readable, on-chain verifiable, micropayment-enabled.

Sello Free

Attribution only. Free for any use.

sello-free

Sello NC

Free for humans. Companies pay.

sello-nc

Sello Voice

Read free. Narration via micropayment.

sello-voice

Sello Pay

All AI use requires payment.

sello-pay

No Train

Use allowed. Training prohibited.

sello-no-train

Live Example

One Tag to Rule Them All

Asilo Digital — 2,700+ articles shielded with one line of HTML.

VERIFIED
SOLANA
<meta name="sello" content="
id:8xK2mN|license:sello-voice|
author:Daniel Patete|publisher:Asilo Digital|
pay:https://sello.dev/api/narrate|
onchain:solana:devnet:2NDZJtmAN44AMtTUBDd56zR2so...|
price_usdc:0.10">
👁

AI reads article

Parses meta tag

⚡

Pays $0.10 USDC

x402 automatic

◈

Receipt on Solana

Immutable proof

Ready to shield
your content?

"Every great work deserves a seat at the AI table —
with terms defined by the creator, not the scraper."

Creator OnboardingAI Developer Tools
Solana Devnet ✓x402 Standard ✓ElevenLabs Voice ✓EU CDSM Art. 4 ✓
@selloprotocol on X/TwitterOpen Source on GitHub