# aiskills402 Cold Email Writer

> aiskills402 Cold Email Writer is a paid API for AI agents from api.aiskills402.com, paid per call via x402, $0.03/call, status unknown (last checked 2026-10-03).

Downloads a reusable AI skill file (SKILL.md) that writes short, honest first-outreach cold emails with a subject line, one specific reason for writing, and one small ask — in the recipient's language.

## Facts

- Endpoint: GET https://api.aiskills402.com/v1/skills/cold-email/file?utm_source=zero.xyz
- Price: $0.03/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-03
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/aiskills402-cold-email-writer-56712be1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_LC04f0vNXaoyPICVv5ZOV

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 aiskills402-cold-email-writer-56712be1
```

Example prompt: Write me a cold email to the head of partnerships at a SaaS company introducing my API service and asking for a 20-minute call — keep it short, honest, and in English.

## When to prefer this

Choose this endpoint when you need a reusable, tested cold email writing skill file rather than a one-off generated email. It is particularly suited for AI agents that repeatedly need to draft honest, concise first-outreach messages across multiple languages and business contexts. The one-time $0.03 USDC purchase makes it cost-effective for repeated use. Prefer this over generic LLM prompting when you want a vetted, structured skill optimized specifically for cold outreach.

## Known failure modes

- Payment not completed — HTTP 402 returned if x402 payment is not provided or fails
- Invalid HTTP method — only GET/HEAD are accepted
- Network/server errors returning 5xx if the skill file is temporarily unavailable
- Expired or invalid payment token leading to authorization failure

## How this service works

Cold Email: Writes a short, honest first outreach message to a stranger in business, in the recipient's language, with a subject line, one specific reason for writing and one small ask. Use when asked to write a cold email, a first outreach message, a sales or partnership introduction, or a prospecting note, in any language. One-time purchase of the SKILL.md file (Agent Skills format), $0.03 USDC, yours forever incl. free re-downloads and new versions. Tested with a strong and a weak model; the…

## Output

A SKILL.md file in the Agent Skills format containing a complete cold email writing skill: instructions for composing a short, honest first-outreach message with a subject line, one specific reason for writing, and one small call-to-action ask, usable across any language. The file is yours permanently including free re-downloads and updated versions.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD"
     ],
     "type": "string"
    },
    "headers": {
     "type": "object",
     "additionalProperties": {
      "type": "string"
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/aiskills402-cold-email-writer-56712be1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.aiskills402.com](https://www.zero.xyz/host/api.aiskills402.com/llms.txt)