# QuantumShield Labs Verifier

> QuantumShield Labs Verifier is a paid API for AI agents from verifier.quantumshieldlabs.dev, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-14).

Classifies agent or automation operations from submitted evidence and returns a deterministic, machine-readable execution receipt indicating verified or unverified completion status.

## Facts

- Endpoint: POST https://verifier.quantumshieldlabs.dev/x402/verify
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quantumshield-labs-verifier-21bea0f6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__OeOgzjNPo-63GpPQrzPP

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 quantumshield-labs-verifier-21bea0f6 -d '<json body>'
```

Example prompt: I need to verify that the data-export operation I just ran (operation ID 'export-2024-06-01') actually completed — here are the evidence items: a file checksum match, a row count confirmation, and a destination write acknowledgment. Those three are the required verifications. Can you submit these to the verifier and get me a machine-readable receipt?

## When to prefer this

Use this endpoint when an AI agent or automation pipeline needs independent, tamper-resistant verification of task completion — especially when downstream decisions depend on confirmed execution rather than self-reported claims. Prefer it over simple logging or self-attestation when auditability, accountability, or multi-party trust is required. It is particularly valuable in agentic workflows where a downstream agent or human must trust that a prior step actually completed with specific outputs.

## Known failure modes

- Insufficient evidence items relative to required_verifications results in a non-verified classification rather than an error
- Missing operation_id may cause receipt to be unattributable
- Malformed evidence_items objects (missing required 'name' field) will likely cause a 400 validation error
- Claimed state unsupported or unrecognized may result in classification failure
- Network or payment failure (x402) returns 402 Payment Required before any verification occurs

## How this service works

Classify an agent or automation operation from bounded evidence and return a deterministic execution receipt. Use when completion claims need independent machine-readable verification. Claims alone never produce VERIFIED_COMPLETE.

## Output

A deterministic execution receipt classifying the operation as VERIFIED_COMPLETE or another state, based on whether the submitted evidence items satisfy the required_verifications. The receipt is machine-readable and independent of the caller's claims alone — claims without sufficient evidence will not produce VERIFIED_COMPLETE.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "error": {},
  "blockers": {
   "type": "array"
  },
  "dependencies": {
   "type": "array"
  },
  "operation_id": {
   "type": "string",
   "description": "Caller-controlled operation identifier"
  },
  "claimed_state": {
   "type": "string",
   "description": "The operation state claimed by the caller"
  },
  "claimed_output": {
   "description": "Optional output claimed by the caller"
  },
  "evidence_items": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "name"
    ],
    "properties": {
     "name": {
      "type": "string"
     },
     "detail": {},
     "result": {},
     "source": {
      "type": "string"
     },
     "description": {
      "type": "string"
     }
    }
   }
  },
  "required_verifications": {
   "type": "array",
   "items": {
    "type": "string"
   },
   "description": "Evidence names required for verified completion"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/quantumshield-labs-verifier-21bea0f6/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from verifier.quantumshieldlabs.dev](https://www.zero.xyz/host/verifier.quantumshieldlabs.dev/llms.txt)