# 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 CTAs before publishing by scoring quality, flagging risks, and recommending improvements

## Facts

- Endpoint: POST https://nexuseval.vercel.app/api/evaluate/email
- 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-1d49f281
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_YeVZ4UxeB3hIyiV_EUjZT

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-1d49f281 -d '<json body>'
```

Example prompt: Before I send this email campaign, can you run a preflight quality check on it? The headline is 'Unlock 50% Off — Today Only', the copy is 'Our biggest sale of the year is here. Shop now and save big on all products', the CTA is 'Shop Now', it's targeting deal-seeking millennials, and the objective is to drive e-commerce conversions.

## When to prefer this

Choose this endpoint when an AI agent needs a structured, scored quality gate before publishing marketing content — especially email campaigns. It is particularly valuable in automated marketing pipelines where human review is bypassed and a programmatic PASS/FAIL decision with risk flags is needed. Prefer it over generic LLM prompting when you need a consistent numeric score and structured risk output rather than freeform critique.

## Known failure modes

- Missing required fields (copy or headline) returns a validation error
- Copy too short or nonsensical may return low score with vague recommendations
- Ambiguous audience or objective may reduce recommendation specificity
- Network timeout or service unavailability returns a 5xx error
- Payment failure via x402 protocol blocks request from being processed

## How this service works

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

## Output

Returns a numeric quality score (0-100), a PASS or FAIL decision, an array of risk flags identifying potential issues with the copy, and an array of actionable recommendations to improve the marketing material before publishing.

## 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": {
  "score": 82,
  "decision": "PASS",
  "riskFlags": [],
  "recommendations": []
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/nexuseval-marketing-preflight-1d49f281/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)