X402 SANDBOX PILOT · NO FUNDS REQUIRED

Put one policy decision
before `pay_and_call`.

Keep the wallet, amount cap, confirmation and settlement path exactly where they are. Agent Reserve adds one upstream check for owner mandate, recipient status, required evidence and remaining budget.

Run the preflightCopy the adapter
Reference adapter only. No affiliation, endorsement or production integration is claimed.
LIVE POLICY PREFLIGHTPUBLIC ENDPOINT
NO PAYMENT EXECUTED
AGENT INTENTPurchase a data serviceOwner mandate · 100 per request · 250 remaining today

Calls the live stateless endpoint. The request is not stored; Agent Reserve holds no funds, accesses no wallet and executes no payment.

ONE OPTIONAL HOOK

Inspection stays first.
Payment stays last.

01 · EXISTINGInspect endpoint

Discover the price and target before any irreversible action.

→
02 · ADDAuthority gateway

Apply owner-controlled policy and issue a single-use protected handoff only on eligible.

→
03 · EXISTINGConfirm and pay

Only an eligible request may reach the wallet's existing controls.

DROP-IN REFERENCE

A small adapter, not a replacement payment stack.

The example uses ARP's public stateless MCP endpoint and the 2026-07-28 transport headers. It never receives a key, signs a transaction or calls the payment rail.

eligibleContinue to the wallet's existing confirmation path
escalatePause and ask the owner for an explicit decision
blockStop before any payment rail is invoked
timeout / malformedFail closed; do not call the payment tool
REFERENCE ADAPTER · JAVASCRIPT
async function authorizeX402(request) {
  const response = await fetch("https://agent-reserve-protocol.super-myna-7255.chatgpt.site/api/mcp", {
    method: "POST",
    headers: {
      "content-type": "application/json",
      "mcp-protocol-version": "2026-07-28",
      "mcp-method": "tools/call",
      "mcp-name": "evaluate_agent_spend_request"
    },
    body: JSON.stringify({
      jsonrpc: "2.0",
      id: crypto.randomUUID(),
      method: "tools/call",
      params: {
        name: "evaluate_agent_spend_request",
        arguments: request
      }
    })
  });

  if (!response.ok) throw new Error("authorization unavailable");
  const rpc = await response.json();
  if (!rpc.result?.structuredContent) throw new Error("invalid receipt");
  return rpc.result.structuredContent;
}

const receipt = await authorizeX402({
  mandateValid: true,
  vendorStatus: "trusted",
  receiptStatus: "pass",
  amount: 48,
  perRequestLimit: 100,
  dailyRemaining: 250
});

if (receipt.decision !== "eligible") {
  throw new Error("stop before payment");
}

// Only now continue to the wallet's existing confirmation path.
return pay_and_call(targetUrl);

ACCEPTANCE TEST

One receipt is enough to evaluate fit.

✓ Synthetic values only✓ Existing amount caps remain authoritative✓ Existing confirmation remains authoritative✓ No wallet or key access✓ No mainnet request✓ Fail closed on any invalid response

Success means the adapter returns a valid decision receipt and the downstream payment path advances only on eligible. It does not mean security certification, production readiness or customer demand.

PUBLIC SANDBOX

Test the policy boundary without moving money.

Authority gatewayMCP endpoint ↗Decision vectors ↗
Zero customers · Zero production integrations · No independent security certification