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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 before publishing by scoring quality, flagging risks, and recommending improvements
Price / call$0.04
Success—
StatusUnknown
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.
Example use cases
Email campaign quality gate
“Before we blast this promotional email, check the quality: headline is 'Your Exclusive Invite Is Here', copy is 'Join our VIP program and get early access to new collections plus member-only discounts', CTA is 'Join Now', audience is existing customers aged 25-40, and objective is loyalty and retention.”
New product launch ad review
“Can you evaluate this product launch ad copy before we publish? Headline: 'Introducing SmartBrewPro — Coffee Reinvented', copy: 'The only coffee maker that learns your taste. Freshly brewed perfection every morning.', CTA: 'Pre-Order Now', target audience is tech-savvy home baristas, and our objective is to drive pre-order conversions.”
SaaS trial sign-up campaign check
“Run a preflight check on our latest SaaS campaign — headline is 'Start Your Free Trial in 60 Seconds', the copy reads 'No credit card needed. Collaborate, automate, and scale with our all-in-one platform.', CTA is 'Try Free', audience is small business owners, and the objective is free trial sign-ups.”
Technical details
Endpoint
POSThttps://nexuseval.vercel.app/api/evaluate/emailWhen to prefer
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.
Side effects
- 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
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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