# Inkbox AI Correspondence Writer

> Inkbox AI Correspondence Writer is a paid API for AI agents from inkinbox402.netlify.app, paid per call via x402, $0.15/call, status unknown (last checked 2026-09-14).

Drafts AI-generated correspondence (letters, emails, or messages) given a purpose and optional tone

## Facts

- Endpoint: POST https://inkinbox402.netlify.app/api/correspondence
- Price: $0.15/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-correspondence-writer-44f3bcf3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_kTYuEEUb7qrcR0Bsem6RK

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-correspondence-writer-44f3bcf3 -d '<json body>'
```

Example prompt: Draft me a professional correspondence with the purpose of requesting a refund for a defective product, and write it in a polite but firm tone.

## When to prefer this

Choose this endpoint when you need to quickly generate a draft letter, email, or formal message for a specific purpose and want tone control. Best suited for agents automating correspondence workflows where pay-per-call USDC billing on Base is acceptable.

## Known failure modes

- Missing required 'purpose' field returns a 400 validation error
- Payment not included or insufficient USDC triggers a 402 Payment Required response
- Ambiguous or empty purpose may result in generic or low-quality output
- Service unavailable on Netlify hosting returns a 503 error
- Rate limiting or quota exhaustion may return a 429 Too Many Requests error

## 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 JSON object with a success boolean and a data object containing the AI-generated correspondence text tailored to the specified purpose and tone.

## 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-correspondence-writer-44f3bcf3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from inkinbox402.netlify.app](https://www.zero.xyz/host/inkinbox402.netlify.app/llms.txt)