# NexusEval Marketing Preflight

> NexusEval Marketing Preflight is a paid API for AI agents from nexuseval.vercel.app, paid per call via x402, $0.04/call, status unknown (last checked 2026-09-14).

Evaluates marketing copy, headlines, and campaigns before publication, returning a quality score, risk flags, and actionable recommendations.

## Facts

- Endpoint: POST https://nexuseval.vercel.app/api/evaluate
- Price: $0.04/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/nexuseval-marketing-preflight-c633ebe6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8RdWM6r9owkpwC245gxMC

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 nexuseval-marketing-preflight-c633ebe6 -d '<json body>'
```

Example prompt: Can you run a preflight check on this email campaign copy — headline is 'Unlock 50% Off Today Only', the copy is [paste text], the CTA is 'Shop Now', my audience is millennials interested in sustainable fashion, and my objective is driving conversions?

## When to prefer this

Choose this endpoint when an AI agent needs an automated pre-publish quality gate for marketing content — especially in agentic workflows where copy is generated and must be validated before distribution. It is purpose-built for marketing evaluation (not generic text analysis), returning structured scores and risk flags rather than freeform critique, making it easy to integrate into approval pipelines.

## Known failure modes

- Missing required fields (copy or headline) may return a validation error
- Extremely long copy may cause timeouts or truncation
- Ambiguous or empty objective/audience may produce lower-confidence scores
- Network or payment failure via x402 protocol returns a 402 status before evaluation occurs

## How this service works

x402-native pre-publish Marketing Quality Gateway for autonomous AI agents.

## Output

Returns a JSON object with an overallScore (integer, e.g. 82), a breakdown object with sub-scores across quality dimensions, a riskFlags array listing any problematic language or compliance concerns, and a recommendations array with actionable improvements to the copy.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "cta": {
   "type": "string",
   "description": "Primary call to action"
  },
  "copy": {
   "type": "string",
   "description": "Marketing copy or campaign material to evaluate"
  },
  "audience": {
   "type": "string",
   "description": "Target audience"
  },
  "headline": {
   "type": "string",
   "description": "Headline, subject line or core message"
  },
  "objective": {
   "type": "string",
   "description": "Primary marketing objective"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "breakdown": {},
  "riskFlags": [],
  "overallScore": 82,
  "recommendations": []
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/nexuseval-marketing-preflight-c633ebe6/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from nexuseval.vercel.app](https://www.zero.xyz/host/nexuseval.vercel.app/llms.txt)