# NEXUS Text QA Validator

> NEXUS Text QA Validator is a paid API for AI agents from x402.nexusword.it, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-01).

Checks a text string for quality issues such as duplicate spaces and returns a deterministic pass/fail assessment with a list of detected problems

## Facts

- Endpoint: POST https://x402.nexusword.it/v1/text-qa?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/nexus-text-qa-validator-143d7c93
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_gYoK-OXPSQVZuW_3ngHtu

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 nexus-text-qa-validator-143d7c93 -d '<json body>'
```

Example prompt: Can you check this paragraph for text quality issues like duplicate spaces or formatting problems: 'This is  a sample  sentence with   extra spaces.'

## When to prefer this

Choose this endpoint when you need a lightweight, deterministic, low-cost ($0.02 USDC) text validation pass that returns structured issue lists rather than a generative explanation. It is ideal for automated pipelines where consistency and reproducibility matter more than nuanced editorial feedback, and when you want to check for specific formatting defects like duplicate spaces rather than subjective style improvements.

## Known failure modes

- Missing or empty 'text' field returns an error or empty analysis
- Very long text inputs may hit payload limits
- Payment failure (402) if x402 payment header is missing or invalid USDC amount
- Malformed JSON body returns a 4xx error
- Network timeout on the x402 payment negotiation step

## How this service works

x402-paid deterministic utilities for autonomous agents

## Output

A JSON object with an 'ok' boolean indicating whether the text passed validation, and an 'issues' array listing specific problems found (e.g. 'duplicate spaces'). If ok is true, issues is empty; if false, issues enumerates each detected problem.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "text": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": false,
  "issues": [
   "duplicate spaces"
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/nexus-text-qa-validator-143d7c93/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.nexusword.it](https://www.zero.xyz/host/x402.nexusword.it/llms.txt)