# 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, returning a quality score, pass/fail decision, risk flags, and recommendations.

## Facts

- Endpoint: POST https://nexuseval.vercel.app/api/evaluate/gtm
- 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-a99261fd
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_OS6ucy5FdPNSjA1wJIqc3

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-a99261fd -d '<json body>'
```

Example prompt: Run a preflight quality check on this email campaign copy — headline is 'Double Your Revenue in 30 Days', CTA is 'Start Free Trial', audience is SaaS founders, objective is lead generation — and tell me whether it passes and what risks or improvements you see.

## When to prefer this

Use this endpoint when an AI agent or automated marketing workflow needs a structured, scored quality gate before publishing any marketing asset — especially when you need a machine-readable PASS/FAIL decision and risk flags rather than open-ended editorial feedback. Prefer this over general LLM critique when you need consistent scoring, risk flag enumeration, and a deterministic publish decision in an autonomous pipeline.

## Known failure modes

- Missing required fields (copy or headline) may cause validation errors or low-confidence scoring
- Extremely short or placeholder copy may yield low scores without meaningful recommendations
- Ambiguous or very broad audience descriptions may reduce recommendation specificity
- Service unavailability returns HTTP 5xx with no score or decision
- Payment failure via x402 protocol prevents evaluation from running

## 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 problematic content or compliance concerns, and an array of actionable recommendations for improving the marketing material.

## 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-a99261fd/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)