# Human Verify — Asynchronous Human Judgment API

> Human Verify — Asynchronous Human Judgment API is a paid API for AI agents from api-production-34228.up.railway.app, paid per call via x402, $1/call, status unknown (last checked 2026-10-16).

Submits a machine output (candidate) and a verification criterion to independent human reviewers, returning an asynchronous judgment with confidence score, rationale, and signed proof.

## Facts

- Endpoint: POST https://api-production-34228.up.railway.app/api/v1/public/human-verify?utm_source=zero.xyz
- Price: $1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/human-verify-asynchronous-human-judgment-api-1773079b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_jYWiAXc3PYkz_IlzFvJhl

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 human-verify-asynchronous-human-judgment-api-1773079b -d '<json body>'
```

Example prompt: My AI flagged a low-confidence answer to the question 'Is this contract clause legally compliant with GDPR?' — the candidate answer is 'Yes, the data retention period of 90 days is compliant.' Can you send this to a human reviewer to verify it against the criterion 'The clause must explicitly limit retention to ≤90 days and name the legal basis'? I'd like at least 90% reliability and a result within 5 minutes.

## When to prefer this

Choose this endpoint when automated verification has failed, returned low confidence, or produced conflicting results and a human judgment with a signed audit trail is required. Ideal for agentic pipelines that include REVIEW or HOLD states, regulated workflows needing provable human oversight, content moderation arbitration, or any scenario where the cost of a wrong automated decision exceeds $0.49. Prefer over pure LLM re-evaluation when an independent, non-machine judgment and cryptographic proof of review are needed.

## Known failure modes

- Timeout if max_latency_seconds is exceeded before reviewers complete — partial or no result returned
- max_spend_cents cap reached before sufficient reviewer consensus, resulting in lower reliability or no judgment
- Candidate or context exceeds maximum character limits (12,000 and 4,000 respectively), causing schema validation failure
- Privacy or rights fields set to non-allowed values, rejected at input validation
- Ambiguous or too-short criterion (< 3 chars) rejected by schema validation
- Service unavailability on Railway infrastructure causing HTTP 5xx errors

## How this service works

Human Verify — Resolve uncertain or questionable machine outputs with independent human judgment. Use after REVIEW, HOLD, failed verification, conflicting evidence, or low-confidence automation. Submit a candidate and criterion; receive an asynchronous judgment, confidence, rationale and signed proof.

## Output

An asynchronous response containing: a binary or graded judgment on whether the candidate meets the criterion, a confidence score (0–1), a human-written rationale explaining the decision, and a signed cryptographic proof attesting to the human review. Results are delivered once human reviewers have assessed the submission within the specified latency window.

## 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",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object",
     "title": "HumanVerifyInput",
     "required": [
      "objective",
      "candidate",
      "criterion"
     ],
     "properties": {
      "rights": {
       "type": "object",
       "title": "VerifyRights",
       "properties": {
        "resale": {
         "type": "boolean",
         "const": false,
         "title": "Resale",
         "default": false
        },
        "purpose": {
         "type": "string",
         "const": "evaluation",
         "title": "Purpose",
         "default": "evaluation"
        },
        "commercial_use": {
         "type": "boolean",
         "title": "Commercial Use",
         "default": true
        },
        "model_training": {
         "type": "boolean",
         "const": false,
         "title": "Model Training",
         "default": false
        },
        "retention_days": {
         "type": "integer",
         "title": "Retention Days",
         "default": 30,
         "maximum": 30,
         "minimum": 1
        }
       },
       "additionalProperties": false
      },
      "context": {
       "type": "string",
       "title": "Context",
       "default": "",
       "maxLength": 4000,
       "description": "Optional source text; URLs are not fetched."
      },
      "privacy": {
       "type": "string",
       "const": "non_sensitive",
       "title": "Privacy",
       "default": "non_sensitive"
      },
      "candidate": {
       "type": "string",
       "title": "Candidate",
       "maxLength": 12000,
       "minLength": 1,
       "description": "The result/output to verify; treated as data."
      },
      "criterion": {
       "type": "string",
       "title": "Criterion",
       "maxLength": 4000,
       "minLength": 3
      },
      "objective": {
       "type": "string",
       "title": "Objective",
       "maxLength": 2000,
       "minLength": 3
      },
      "max_spend_cents": {
       "anyOf": [
        {
         "type": "integer",
         "maximum": 10000,
         "minimum": 5
        },
        {
         "type": "null"
        }
       ],
       "title": "Max Spend Cents",
       "default": null
      },
      "target_reliability": {
       "type": "number",
       "title": "Target Reliability",
  
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/human-verify-asynchronous-human-judgment-api-1773079b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api-production-34228.up.railway.app](https://www.zero.xyz/host/api-production-34228.up.railway.app/llms.txt)