Pre-settlement attestation on x402 — demand ahead of supply

Entropy Index shipped pre-settlement attestation on the x402 rail in August 2026: a free stamp agents can read before they pay, with HMAC verification and a published spec. As of the August mall snapshot, attested listings were still scarce — demand ahead of supply.

Why it shipped

Agents quote, size, and send in a loop with a wallet budget. The missing step was a verify-before-pay read — not another sticker score.

Pre-settle answers: is this origin honest about staging, and what am I about to buy?

Mall context

As of an August 2026 snapshot: on the order of 169 attested listings on the largest facilitator catalog. The rail is young. Receipt demand is ahead of supply.

What we will not claim

  • Not “only attested seller on x402.”
  • Not organic GMV without on-chain tx_hash.
  • Not a substitute for diligencing sealed physics — attestation is integrity, not alpha.

Spec and catalog

Attestation spec · x402 catalog · 1,000 endpoints note.

Q&A

What is pre-settlement attestation?
A signed stamp you can fetch before paying — regime context and integrity fields without spending USDC.
Is this a trade signal?
No. Risk context before the transaction — not allocation advice.
Where is the integration guide?
/developers#regime-gate and /.well-known/x402-attestation.json

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