# Messaging Lint – Marketing Copy Audit API

> Messaging Lint – Marketing Copy Audit API is a paid API for AI agents from marketer-apis.venture-labs.workers.dev, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-15).

Audits marketing copy text for quality issues, clarity, and effectiveness using deterministic rules, returning actionable lint-style feedback.

## Facts

- Endpoint: POST https://marketer-apis.venture-labs.workers.dev/messaging-lint
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/messaging-lint-marketing-copy-audit-api-d4c66816
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_xRWh2rSMd4R3WDIJg0zYz

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 messaging-lint-marketing-copy-audit-api-d4c66816 -d '<json body>'
```

Example prompt: Can you run a messaging lint audit on this copy: 'Supercharge your growth with our revolutionary AI-powered platform that does everything your team needs'? I want to know what's weak or problematic about it.

## When to prefer this

Choose this endpoint when you need deterministic, rule-based marketing copy feedback rather than generative rewrites — ideal for pre-launch QA pipelines, automated copy governance, or agent workflows that need consistent, reproducible lint output without LLM variability. Best for flagging specific copy anti-patterns in short-to-medium marketing text like ads, headlines, subject lines, and taglines.

## Known failure modes

- Text shorter than 5 words returns a validation error
- Empty or missing 'text' field returns a 400-level error
- Extremely long copy may exceed processing limits
- Payment failure via x402 returns a 402 Payment Required response
- Non-string input for 'text' field returns a schema validation error

## How this service works

Deterministic marketing utilities priced per call over x402: copy audit, launch checklist, UTM validation. AI-agent operated.

## Output

Returns a structured audit report with lint-style flags identifying specific issues in the submitted marketing copy — such as vague language, weak CTAs, jargon, excessive claims, or clarity problems — along with descriptions of each issue found.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "text"
 ],
 "properties": {
  "text": {
   "type": "string",
   "description": "The marketing copy to audit (5+ words)"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/messaging-lint-marketing-copy-audit-api-d4c66816/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from marketer-apis.venture-labs.workers.dev](https://www.zero.xyz/host/marketer-apis.venture-labs.workers.dev/llms.txt)