# Inkbox AI Content Studio — Correspondence Drafting

> Inkbox AI Content Studio — Correspondence Drafting is a paid API for AI agents from pen-inkbox402.netlify.app, paid per call via x402, $0.3/call, status unknown (last checked 2026-09-14).

Generates AI-drafted correspondence (letters, emails, messages) based on a specified purpose and optional tone

## Facts

- Endpoint: POST https://pen-inkbox402.netlify.app/api/correspondence
- Price: $0.3/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/inkbox-ai-content-studio-correspondence-drafting-e2a1b74e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__sbFl0rHZRmvZMJkzvfim

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 inkbox-ai-content-studio-correspondence-drafting-e2a1b74e -d '<json body>'
```

Example prompt: Draft a formal correspondence for me — the purpose is to request a refund for a damaged product from a supplier, and the tone should be professional but firm.

## When to prefer this

Choose this endpoint when you need to quickly draft structured written correspondence — emails, letters, or messages — with a specific purpose and controllable tone, especially in automated workflows where USDC pay-per-call pricing is acceptable and no persistent account setup is desired.

## Known failure modes

- Missing required 'purpose' field returns a 400 validation error
- Payment not received or insufficient USDC balance causes a 402 Payment Required response
- Vague or ambiguous purpose may result in generic or unhelpful correspondence
- Service unavailability on Netlify hosting returns a 503 error
- Overly long or complex purpose input may result in truncated or incomplete output

## How this service works

Draft, rewrite, translate, and optimize written content. 25 AI-powered endpoints. Pay-per-call with USDC on Base.

## Output

Returns a structured response containing the AI-generated correspondence text tailored to the provided purpose and tone, wrapped in a success boolean and a data object.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "purpose"
 ],
 "properties": {
  "tone": {
   "type": "string"
  },
  "purpose": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "data": {
   "type": "object"
  },
  "success": {
   "type": "boolean"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/inkbox-ai-content-studio-correspondence-drafting-e2a1b74e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from pen-inkbox402.netlify.app](https://www.zero.xyz/host/pen-inkbox402.netlify.app/llms.txt)