# Signal-Gated x402 Spend Execution Procedure

> Signal-Gated x402 Spend Execution Procedure is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status down (last checked 2026-10-17).

Returns a decision procedure for agents running event-driven chain scanners or price feeds, covering condition gating, deduplication, per-trigger budget caps, cooldown windows, circuit-breaker thresholds, evidence logging, and human-escalation rules to prevent runaway micropayment spending.

## Facts

- Endpoint: GET https://k2so.wrong.systems/api/services/signal-gated-x402-spend-procedure?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: down
- Last checked: 2026-10-17
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/signal-gated-x402-spend-execution-procedure-0991ede8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_2PRzVp7hFGoyORfKgNZEA

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability signal-gated-x402-spend-execution-procedure-0991ede8
```

Example prompt: I'm building an on-chain event scanner that pays per x402 call only when a signal fires — can you fetch the signal-gated x402 spend procedure so I know how to handle deduplication, set per-trigger budget caps, configure cooldown windows, and decide when to escalate to a human instead of auto-spending?

## When to prefer this

Choose this endpoint when building an autonomous agent that makes x402 micropayments contingent on real-time signals (on-chain events, price thresholds, event monitors) and you need a structured, vetted decision framework — not just ad-hoc logic — for deduplication, budget governance, circuit-breaking, and human escalation. Prefer it over rolling your own logic when the cost of runaway payments (the 'pay 40 times for the same event' failure mode) is a real risk in your pipeline.

## Known failure modes

- Payment not included or invalid: returns 402 with payment instructions
- Service unavailable on k2so.wrong.systems: network or host error
- Malformed query parameters: unexpected enum value for meta param returns validation error
- Empty or null payload: handler may return ok=true but with no procedure content if service is misconfigured

## How this service works

Decision procedure for agents running real-time chain scanners, price feeds, or event monitors that pay per x402 call only when a signal fires. Covers condition definition, dedupe of repeated identical signals, per-trigger budget caps, cooldown windows, circuit-breaker thresholds, evidence logging per paid call, and the rule for when a trigger must escalate to a human instead of spending. Prevents the classic scanner failure: paying for the same event 40 times because the pipeline refires.

## Output

A structured decision procedure document (JSON payload) covering: signal condition definitions for gating x402 calls, deduplication logic to prevent paying for repeated identical signals, per-trigger budget cap rules, cooldown window specifications between triggers, circuit-breaker thresholds that halt spending after anomalous activity, evidence logging requirements per paid call, and the escalation rule set defining when a trigger must involve a human rather than auto-executing a payment.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "meta": {
       "enum": [
        "0",
        "1"
       ],
       "type": "string",
       "description": "Set to 1 for free metadata JSON (no payment required)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "title": "Signal-gated x402 spend execution procedure paid response",
     "$schema": "https://json-schema.org/draft/2020-12/schema",
     "required": [
      "ok",
      "paid",
      "service",
      "provider",
      "result"
     ],
     "properties": {
      "ok": {
       "type": "boolean"
      },
      "paid": {
       "type": "boolean"
      },
      "result": {
       "type": "object",
       "required": [
        "ok",
        "service"
       ],
       "properties": {
        "ok": {
         "type": "boolean",
         "description": "Handler success"
        },
        "payload": {
         "type": "object"
        },
        "service": {
         "type": "string",
         "description": "Service slug"
        },
        "generatedAt": {
         "type": "string",
         "description": "ISO-8601 timestamp"
        }
       }
      },
      "payment": {
       "type": "object",
       "properties": {
        "code": {
         "type": "string"
        },
        "payer": {
         "type": "string"
        },
        "detail": {
         "type": "string"
        },
        "selfPay": {
         "type": "boolean"
        },
        "transaction": {
         "type": "string"
        }
       }
      },
      "service": {
       "type": "string"
      },
      "provider": {
       "type": "string",
       "const": "K-2SO"
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "paid": true,
  "result": {
   "ok": true,
   "payload": {
    "key": "value"
   },
   "service": "signal-gated-x402-spend-procedure",
   "generatedAt": "2026-01-01T00:00:00.000Z"
  },
  "service": "signal-gated-x402-spend-procedure",
  "provider": "K-2SO"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/signal-gated-x402-spend-execution-procedure-0991ede8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from k2so.wrong.systems](https://www.zero.xyz/host/k2so.wrong.systems/llms.txt)