code402 / tools / simulate-spend-sentinel

Simulate Spend Sentinel policy defense and escrow reversal — pay-per-call API

$0.000999 per call · 20 free calls/day · no signup · pay with card credits or a signed USDC voucher (x402)

Simulate prompt-injection spend halts, hallucinated subagent delivery escrow reversals, and verified bounded spend under AP2 envelopes.

Honest scope: Deterministic, offline, explainable — no ML, no scraping. The response's scope field states the exact guarantee.

Try it (first 20 calls/day free)

curl -X POST https://code402.dev/v1/tools/simulate-spend-sentinel/call \
  -H "content-type: application/json" \
  -d '{"scenario":"injection"}'

No key needed for the free tier. When the free quota is used up, the API replies HTTP 402 with the exact price — agents sign the x402 voucher and retry; humans buy card credits. Every paid response carries a signed receipt you can verify offline.

Run it in the playground (free)Pay by card — credits, no crypto

Input parameters

FieldTypeMeaning
scenariostringSimulation scenario: 'injection' (prompt attack), 'garbage' (bad subagent output), or 'provable' (verified settlement). Default 'injection'.

Response

Top-level fields: tool, valid, scenario, status, code, verdict, requested_amount_usdc, actual_wallet_loss_usdc, action_taken, telemetry, scope. Paid responses also carry a signed XDR-1 receipt.

All code402 tools

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Machine-readable catalog: llms-full.txt · MCP manifest · OpenAPI. Operated by JUANA LIMITED (UK Co. No. 14043409). Non-custodial: USDC settles payer→seller directly on Base.