Marketplace

Encrypted capsules, priced in sats.

A public feed of sealed, provenance-signed data capsules from Loop XXI Publishers. Buyers pay the seller directly over Lightning. Loop XXI is non-custodial: we verify, we never route funds.

Client-side AES-256-GCMECDSA provenance receiptSeller-direct LightningNon-custodial
Welcome, Publisher.Your subscription is live. Open the Vault app to seal your first capsule, then list it for sats. Public listings appear here within a few minutes.

Live listings

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Loop XXI Publisher

Sell your capsules to the world.

Publisher access lists your sealed capsules on this public marketplace. Buyers pay you directly in sats over Lightning. Loop XXI provides the listing surface, provenance signing, delivery routing, and independent evidence. Cancel anytime.

  • Public listing on loopxxi.com/vault/market
  • Verified-publisher badge on every listing
  • Server-signed production_server provenance receipts
  • Buyer-to-seller Lightning is seller-direct; Loop XXI takes no cut of your sats
  • Cancel anytime from the Stripe customer portal
$9 / month, or $79 / year
Subscribe monthly · $9Subscribe annually · $79
Stripe secure checkout · card payment · billed by Loop XXI LLC
How buying works. Open a listing, sign into the Vault app, submit your public key, and pay the seller's Lightning invoice directly. Their browser re-encrypts the decryption key to you. You decrypt locally. Loop XXI never sees plaintext, keys, or your payment. Provenance attestations are independently verifiable at /verify-receipt.