# Email Campaign Specialist – marketing.402box.io

> Email Campaign Specialist – marketing.402box.io is a paid API for AI agents from marketing.402box.io, paid per call via x402, $0.02/call, status down (last checked 2026-09-15).

Designs email sequences, crafts subject lines, segments audiences, and optimizes email campaigns for conversions using an AI agent powered by Gemini Pro

## Facts

- Endpoint: POST https://marketing.402box.io/email_campaign_specialist
- Price: $0.02/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/marketing-402box-io-8d0998d1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ytZ3AC9hclhCOoYYsqGK6

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 marketing-402box-io-8d0998d1 -d '<json body>'
```

Example prompt: Write me a 5-email drip sequence for new trial users of my project management app, ClickFlow — start with a welcome email, then highlight key features over two weeks, and close with a conversion push to upgrade to paid. Include subject lines for each email.

## When to prefer this

Choose this endpoint when you need AI-generated email marketing content — sequences, subject lines, segmentation strategies, or campaign optimization advice — rather than a generic LLM call, because this agent is specialized for email marketing contexts and produces structured, conversion-focused outputs. Prefer it over generic chat endpoints when the task is email-marketing-specific and you want marketing-domain expertise baked in.

## Known failure modes

- Vague or underspecified message prompt leads to generic, non-actionable email copy
- Missing context about product, audience, or goals results in off-target recommendations
- Very long or complex campaign briefs may be truncated or incompletely addressed
- success: false returned if the underlying Gemini Pro agent call fails
- Quota or payment validation errors returning non-200 responses if USDC payment is insufficient

## How this service works

Design email sequences, craft compelling subject lines, segment audiences, and optimize email campaigns for conversions

## Output

Returns a text response from the Gemini Pro AI agent containing the requested email sequence, subject lines, segmentation recommendations, or campaign strategy, along with the agent name, a success flag, and an ISO 8601 timestamp.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "message"
 ],
 "properties": {
  "message": {
   "type": "string",
   "description": "Your prompt/query for the agent"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "data": {
   "type": "object",
   "properties": {
    "response": {
     "type": "string",
     "description": "Agent response from Gemini Pro"
    }
   }
  },
  "agent": {
   "type": "string",
   "description": "Agent name"
  },
  "success": {
   "type": "boolean",
   "description": "Whether the request was successful"
  },
  "timestamp": {
   "type": "string",
   "description": "ISO 8601 timestamp"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/marketing-402box-io-8d0998d1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from marketing.402box.io](https://www.zero.xyz/host/marketing.402box.io/llms.txt)