# Inkbox AI Correspondence Writer

> Inkbox AI Correspondence Writer is a paid API for AI agents from lastink.netlify.app, paid per call via x402, $0.15/call, status unknown (last checked 2026-09-15).

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

## Facts

- Endpoint: POST https://lastink.netlify.app/api/correspondence
- Price: $0.15/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/inkbox-ai-correspondence-writer-5b07af89
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_EeVZL5uktF8VnYmjqKhLi

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-5b07af89 -d '<json body>'
```

Example prompt: Draft a formal correspondence for me — the purpose is to request a refund for a defective product I received last week, and I want the tone to be polite but firm.

## When to prefer this

Use this endpoint when you need to generate structured, purpose-driven correspondence such as emails, letters, or formal messages, especially when tone control is important. Prefer this over generic text generation when the output format is explicitly a piece of correspondence addressed to a recipient.

## 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 very short purpose may produce generic or unhelpful correspondence
- Service unavailability on Netlify hosting may cause 503 errors

## 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-5b07af89/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from lastink.netlify.app](https://www.zero.xyz/host/lastink.netlify.app/llms.txt)