URL Shortener API
  
Shorten URLs using hash-based approach. Returns a compact shortened URL. Pay-per-call via x402 (USDC on Base L2) -- no API key, no signup, no rate-limit wall.
Part of the klymax402 marketplace -- 100 x402 micropayment APIs for AI agents, one wallet, USDC on Base.
Quickstart -- MCP
Add to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.):
{
"mcpServers": {
"url-shortener": {
"url": "https://url-shortener.api.klymax402.com/mcp"
}
}
}Quickstart -- HTTP (x402)
curl -X POST "https://url-shortener.api.klymax402.com/api/shorten" \
-H "Content-Type: application/json" \
-d '{"url":"https://example.com"}'
# -> 402 Payment Required, with an x402 payment challenge in the response bodyAny x402-aware client (@x402/fetch, x402-agent-tools, ATXP) handles the 402 -> sign -> retry cycle automatically.
Tools
| Tool | Method | Path | Price | Description | |---|---|---|---|---| | utility_shorten_url | POST | /api/shorten | $0.003 | Shorten a URL and return the shortened version |
utility_shorten_url
Use this when you need to shorten a long URL into a compact link. Accepts any valid URL and returns a shortened URL with the hash code, original URL, and creation timestamp. Do NOT use for domain intelligence — use domain_lookup_intelligence instead. Do NOT use for web scraping — use web_scrape_to_markdown instead. Do NOT use for SEO analysis — use seo_audit_page instead.
Parameters
| Name | Type | Required | Description | |---|---|---|---| | url | string | yes | The URL to shorten | | custom_alias | string | no | Optional custom alias for the short URL (3-20 alphanumeric chars) |
Example agent prompts
- "Shorten a long URL into a compact link"
Payment
- Protocol: x402 -- HTTP-native pay-per-call, no signup, no API key
- Network: Base L2 (
eip155:8453) - Asset: USDC
- Facilitator: Coinbase CDP (primary), PayAI (fallback)
Part of klymax402
100 x402 micropayment APIs for AI agents -- one wallet, USDC on Base, zero signup.
- Catalog: https://klymax402.com/llms.txt
- Full API reference: https://klymax402.com/llms-full.txt
- Live stats: https://klymax402.com/stats
License
MIT
