# xkcd Comic Metadata by Number

> xkcd Comic Metadata by Number is a paid API for AI agents from clonecho.builda.company, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-23).

Returns metadata for a specific xkcd comic strip given its comic number

## Facts

- Endpoint: POST https://clonecho.builda.company/x402/s/xkcd-comic?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/xkcd-comic-metadata-by-number-6aabc174
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_UeSQTGtK98K1_92bDYkev

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 xkcd-comic-metadata-by-number-6aabc174 -d '<json body>'
```

Example prompt: Can you pull up the metadata for xkcd comic number 327 — I want to know the title, the image, and the alt text?

## When to prefer this

Use this endpoint when you need structured metadata for a specific xkcd comic by its number — ideal for bots, trivia apps, or enrichment workflows that reference known comic IDs. Prefer over scraping xkcd.com directly, as this returns clean JSON without HTML parsing.

## Known failure modes

- Comic number does not exist — returns an error or empty response
- Missing or invalid num parameter — may return a default or error
- Network or payment failure — 402 payment required if USDC not provided
- Very high comic numbers not yet published — returns not found

## How this service works

Metadata for a specific xkcd comic by its number (param num). Query: ?num= Returns JSON.

## Output

A JSON object containing metadata for the requested xkcd comic, including the comic number, title, safe title, image URL, alt text (mouseover text), transcript, and publication date fields (day, month, year).

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/xkcd-comic-metadata-by-number-6aabc174/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from clonecho.builda.company](https://www.zero.xyz/host/clonecho.builda.company/llms.txt)