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Penny Engine — AI Agent Outcome Guard (Route Plan)
x402
Penny Engine — AI Agent Outcome Guard (Route Plan) is a paid API for AI agents from penny-paid-batch-production.up.railway.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-19).
Validates an AI agent task description and returns a deterministic PASS/FAIL result with a SHA-256 fingerprint via x402 micropayment on Base.
Price / call$0.001
Success—
StatusUnknown
How this service works
Machine-to-machine result validation via x402. One structured call, deterministic PASS or FAIL and SHA-256 fingerprint, $0.001 USDC on Base.
Output
Returns a JSON object with a route plan type (M2M_AGENT_ROUTE_PLAN), execution status (NOT_PERFORMED), a deterministic PASS or FAIL verdict, a SHA-256 fingerprint of the task, and an alternatives array. Costs $0.001 USDC per call settled via x402 on Base.
Example use cases
Gating agentic pipeline on validation
“Before my agent moves to the next step, run an outcome guard check on the task 'extract invoice line items from PDF uploads' and only proceed if it comes back PASS.”
Auditing agent tasks with fingerprints
“I need a SHA-256 fingerprint and a PASS or FAIL verdict for the task 'classify customer sentiment from chat transcripts' — run it through the Penny Engine guard.”
Validating data transformation task
“Check whether the task 'validate JSON records and flag schema violations' is a legitimate, well-formed agent task — I need the route plan verdict and fingerprint for my audit log.”
Technical details
Endpoint
GEThttps://penny-paid-batch-production.up.railway.app/api/route-plan?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a cheap ($0.001 USDC), deterministic, machine-to-machine gate in an agentic pipeline — specifically when you want a PASS/FAIL verdict plus a cryptographic SHA-256 fingerprint for a plain-language task description before committing to downstream execution. Prefer it over heavier LLM-based validators when you need a fast, auditable, reproducible result with a micropayment trail on Base.
Side effects
- Missing or empty 'task' query parameter returns a validation error
- Task string outside 4-160 character range is rejected
- Payment failure via x402 results in 402 Payment Required with no verdict
- Non-GET HTTP method returns method-not-allowed error
- Malformed request body returns schema validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"task": "validate JSON records",
"type": "M2M_AGENT_ROUTE_PLAN",
"execution": "NOT_PERFORMED",
"alternatives": []
}
}Tags
x402
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