Callio is listed for sale at $2,000 USD.

What are Callio's current metrics?

Monthly visitors: Under 1K/mo. Monthly revenue: Pre-revenue.

Callio - Sell Project

Listed March 9, 2026

About Callio

Connect any API with AI Agent under 1 minute

Callio is a unified API gateway for AI agents. Instead of managing auth, rate limits, and keys for every API your agent uses, connect them all through one proxy. Works with Claude Code, Cursor, Antigravity, and any MCP-compatible tool. Browse APIs, generate a single Callio key, and start calling — we handle auth injection, usage tracking, and billing. Free tier included. One key, every API, zero config

Project details

Website: https://www.callio.dev/

Next step: <ol><li data-list="ordered">Launch an "AI Agent Builder" affiliate program: Partner with creators making tutorials on frameworks like AutoGen, CrewAI, and LangChain. Give them a cut of subscriptions when their viewers use Callio to power their agents' tools.</li><li data-list="ordered">Add more API Providers: Continuously add support for new, trending APIs (like Midjourney, specialized datastores, or local LLMs) to become the definitive "App Store for AI Agents.</li><li data-list="ordered">Enterprise Rate Limiting: Expand the Pro tier to allow companies building B2B AI products to white-label Callio's proxy and set unique rate limits for their own end-users.</li><li data-list="ordered">SEO & Content: Publish deep-dive tutorials ranking for high-intent keywords like "How to give an AI agent access to my Email" or "Connect OpenAI to Stripe without code."</li></ol>

For sale

Asking price: $2,000 USD

What's included

Domain name, All related design work, Twitter account, Source code, All related data, Email account

Reason for selling

I am busy with other things and no longer have time to maintain this project.

Project metrics

Average Monthly Visitors: Under 1K/mo

Average Monthly Revenue: Pre-revenue