Gate H3C · Ephemeral callback
Returning Tonalli authorization result…
Looking for the active, challenge-bound x402eCash session.
No payment, transaction, settlement, broadcast, or resource unlock occurs in this callback.
Static browser experiment
x402eCash · WebMCP Challenge
Gate H3C — Tonalli Authorization Bridge
Validate the live requirement, return control to the agent, then let the page own the human decision and short-lived Tonalli authorization rendezvous.
No XEC payment occurs in Gate H3C. Tonalli signs an authorization-only proof. No transaction, PAYMENT-SIGNATURE, settlement, broadcast, or protected resource unlock occurs.
WebMCP
HTTP 402
100 XEC
Human approval
Tonalli handoff
Wallet confirmation
Authorization proof
Cryptographic verification
STOP
First invoke get_paid_xec_resource. It validates the 100 XEC requirement, creates an ephemeral page-owned approval session, and returns approval_required immediately. The human can decide afterward. Invoke get_x402_authorization_result to read the current approval or authorization state.
Human checkpoint
Payment approval required
The resource tool has already returned. This page-owned decision does not sign or send a payment; approval only authorizes opening Tonalli for a separate authorization-only confirmation.
- Amount
- Network
- Asset
- Destination
- Experimental
Awaiting a human decision. No default is selected.
Ephemeral in-memory state
Tonalli authorization rendezvous
Reloading this page destroys the session. No proof or decision is written to browser storage, analytics, or a server.
- State
- idle
- Challenge
Not created- Expires
- Not scheduled
Live browser events
AGENT ECONOMY TRACE
- Waiting for WebMCP capability check…
Runtime events stay in this page only. They are not persisted or sent to analytics.
Gate contract
One short tool call. One page-owned decision. Then stop.
The first tool makes one uncached resource request, validates the H2B requirement, installs the H3A approval session, and returns without waiting for a click. The second read-only tool reports the page-owned ephemeral state.
Live contract
The resource tool accepts only the exact reviewed 100 XEC HTTP 402 requirement and returns approval_required without holding the WebMCP invocation open.
Human + wallet boundary
A later explicit click creates the 32-byte challenge and opens Tonalli in an isolated auxiliary context. No challenge or handoff exists before approval.
Verify + stop
The original page binds the callback to the live requirement, rebuilds the exact signed message, verifies the recoverable secp256k1 signature and payer address, then stops without payment.
Project boundary: x402eCash remains the static public laboratory and evidence portal. x402-XEC remains the separate protocol implementation. This experiment does not turn the portal into a payment backend.