# AISkills402 — vCard from E-mail Signature Skill File

> AISkills402 — vCard from E-mail Signature Skill File is a paid API for AI agents from api.aiskills402.com, paid per call via x402, $0.03/call, status unknown (last checked 2026-10-23).

Purchases and downloads the 'vCard from E-mail Signature' SKILL.md file, paid once in USDC over x402 on Base, with permanent re-download access.

## Facts

- Endpoint: GET https://api.aiskills402.com/v1/skills/vcard-from-signature/file?utm_source=zero.xyz
- Price: $0.03/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/aiskills402-vcard-from-e-mail-signature-skill-file-048aa4bc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_DZAEKJon3qQHIlRkfaieK

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-vcard-from-e-mail-signature-skill-file-048aa4bc
```

Example prompt: Buy me the 'vCard from E-mail Signature' skill from AISkills402 — pay for it in USDC on Base and give me the SKILL.md file so my agent can start extracting vCards from email signatures.

## When to prefer this

Choose this endpoint when an AI agent needs a tested, ready-to-use SKILL.md instruction file specifically for extracting vCard contact data from email signatures, and is able to execute a one-time USDC micropayment over x402 on Base. Prefer this over building custom parsing logic when you want a curated, versioned skill with permanent re-download rights and no subscription overhead.

## Known failure modes

- Payment not settled on Base — transaction pending or insufficient USDC balance causes 402 or payment failure
- Invalid or malformed x402 payment header — returns authentication/payment error
- Skill slug not found — unlikely for this fixed endpoint but would return 404
- Network timeout reaching api.aiskills402.com — returns connection error
- Re-download token already used or expired — returns unauthorized error on redownload endpoint

## How this service works

vCard from E-mail Signature — Turns the signature block of an e-mail (English, Bulgarian, German or another language) into a vCard 4.0 contact card, answered as the card text only. Follows RFC 6350 where plain models slip - VERSION:4.0 right after BEGIN, FN always present, N with exactly five components, ADR with exactly seven, commas, semicolons and backslashes escaped in text values, phone numbers as tel URIs. What the signature does not say stays out - no invented surname, no guessed country…

## Output

Returns a JSON object containing the SKILL.md file content (UTF-8 encoded), the skill's human-readable name ('vCard from E-mail Signature'), its slug identifier ('vcard-from-signature'), a SHA256 checksum for integrity verification, the semantic version, a blockchain settlement transaction hash confirming USDC payment on Base, and a unique re-download token with URL for future access without repayment.

## 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"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "file": {
   "name": "SKILL.md",
   "content": "<the SKILL.md file>",
   "encoding": "utf-8"
  },
  "name": "vCard from E-mail Signature",
  "skill": "vcard-from-signature",
  "sha256": "<sha256 of SKILL.md>",
  "receipt": {
   "tx": "0x<settlement transaction>",
   "settled": true
  },
  "version": "1.0.0",
  "redownload": {
   "url": "<api>/v1/purchases/<token>",
   "token": "<64 hex chars>"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/aiskills402-vcard-from-e-mail-signature-skill-file-048aa4bc/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)