# Decision Verifier API

> Decision Verifier API is a paid API for AI agents from decision-verifier-api.johntaylor1online.workers.dev, paid per call via x402, $0.5/call, status unknown (last checked 2026-09-15).

Verifies an autonomous AI agent decision before it is executed, acting as a safety checkpoint

## Facts

- Endpoint: POST https://decision-verifier-api.johntaylor1online.workers.dev/verify
- Price: $0.5/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/decision-verifier-api-773001e3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_V50CWWNCU1bGkqvf3_OfQ

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 decision-verifier-api-773001e3 -d '<json body>'
```

Example prompt: Before you proceed with that autonomous action, can you run it through the decision verifier to make sure it's safe and approved to execute?

## When to prefer this

Choose this endpoint when an AI agent needs a safety gate before executing a high-stakes or irreversible autonomous action. Particularly useful in agentic pipelines where human-in-the-loop oversight is impractical but automated pre-execution verification is required. Best suited for workflows where a $1.50/call cost is acceptable in exchange for a verifiable checkpoint.

## Known failure modes

- Missing required input or output fields returns a validation error
- Malformed decision payload may result in a 400 Bad Request
- Service unavailability returns a 5xx error, blocking the decision pipeline
- Ambiguous or incomplete decision context may produce low-confidence or rejected results
- Payment failure via x402 protocol prevents the call from completing

## How this service works

Verify an autonomous decision before execution

## Output

Returns a verification result indicating whether the proposed autonomous decision is approved or rejected for execution, potentially including a confidence score, risk level, or reasoning about why the action is or is not safe to proceed.

## Request schema (JSON Schema)

```json
{
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input",
  "output"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "body": {},
     "enum": [
      "POST"
     ],
     "type": "string",
     "bodyType": "json"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/decision-verifier-api-773001e3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from decision-verifier-api.johntaylor1online.workers.dev](https://www.zero.xyz/host/decision-verifier-api.johntaylor1online.workers.dev/llms.txt)