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NexusEval Marketing Preflight
x402
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 against quality criteria before publishing, returning a pass/fail score with risk flags and recommendations.
Price / call$0.04
Success—
StatusUnknown
How this service works
x402-native pre-publish Marketing Quality Gateway for autonomous AI agents.
Output
A JSON object containing a numeric quality score (0–100), a pass/fail decision string, an array of risk flags identifying potential issues with the content, and an array of actionable recommendations for improving the marketing material before publishing.
Example use cases
Email campaign subject line review
“I'm about to send an email blast — can you evaluate this before I hit send? Headline is 'Your Q4 Revenue Is Slipping Away', copy is 'Most sales teams miss quota because their pipeline data is stale. Fix that in 10 minutes.', CTA is 'See How It Works', audience is VP of Sales at mid-market companies, and the objective is driving demo bookings.”
Paid ad copy preflight check
“Run a quality preflight on my new Google ad — headline is 'Save 40% on Business Insurance Today', copy is 'Compare top-rated providers in minutes. No broker needed. Get covered instantly.', CTA is 'Get My Quote', audience is small business owners, and the objective is quote form completions.”
SaaS landing page readiness assessment
“Check if my startup's landing page copy is ready to go live — the headline is 'The Easiest Way to Manage Remote Teams', the copy is 'Sync tasks, track hours, and pay contractors in one place — no spreadsheets required', the CTA is 'Try Free for 14 Days', the target audience is founders of remote-first startups, and the goal is free trial signups.”
Technical details
Endpoint
POSThttps://nexuseval.vercel.app/api/evaluate/landingWhen to prefer
Use this endpoint when an AI agent needs a structured, scored pre-publish gate for marketing content — especially in automated campaign pipelines where human review is skipped. Prefer this over generic LLM prompting when you need a consistent numeric score, explicit risk flags, and a deterministic PASS/FAIL decision you can branch on in a workflow. Ideal for agents orchestrating multi-step marketing automation where content quality must be verified before committing budget or sending to audiences.
Side effects
- Missing required fields (copy, headline, etc.) may result in incomplete evaluation
- Vague or empty objective field could reduce scoring accuracy
- Very long copy inputs may exceed processing limits
- Network timeout if the evaluation service is temporarily unavailable
- Score near decision boundary (e.g. 75-80) may produce inconsistent pass/fail outcomes
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| cta | string | Primary call to action |
| copy | string | Marketing copy or campaign material to evaluate |
| audience | string | Target audience |
| headline | string | Headline, subject line or core message |
| objective | string | Primary marketing objective |
Output
Schema · Response
{
"type": "json",
"example": {
"score": 82,
"decision": "PASS",
"riskFlags": [],
"recommendations": []
}
}Tags
x402
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