signal402
Alexa+ ready · MCP over Streamable HTTP

Your agent can pay.
You stay in control.

Signal402 is the non-custodial policy and approval layer between an AI agent, your wallet, and paid x402 resources.

Run the payment demo ↓ Service health
01 No private keys 02 Explicit approval 03 Tamper-evident audit
+Alexa+
POLICY
GUARD
$x402 API
intent
approved
01

Alexa+ payment lab

Run a complete 402 → policy → approval → wallet → settlement flow. The demo uses test data and never moves real funds.

Alexa+ simulator
A
Alexa+

I can purchase the premium climate-risk signal you requested. Signal402 will check it before anything is signed.

›Buy the premium climate-risk signal
DEMO SAFETY Wallet signing and settlement are simulated on a test network. Production mode accepts an externally signed x402 payload and never handles a private key.
02

Seven checks. One safe payment.

Each transition is explicit, validated, and written to a hash-chained audit log.

  1. 01Discover

    Request resource and receive HTTP 402.

  2. 02Validate

    Pin price, payee, network, and timeout.

  3. 03Policy

    Apply budget and trusted-payee rules.

  4. 04Approve

    Ask the human only when required.

  5. 05Sign

    Keep the private key in the wallet.

  6. 06Settle

    Verify, retry, and prevent replay.

  7. 07Audit

    Return receipt and protected result.