Quick answer
Loomal — Monetize any API in minutes with zero platform fees. It's freemium. Best for monetizing a custom MCP server built for AI agent workflows.
Loomal is a free-to-list, payment-ready API and MCP server marketplace that lets developers start earning from their tools in roughly five minutes. Built for developers who want to expose their APIs or Model Context Protocol (MCP) servers to AI agents and paying users without giving up a cut of revenue, Loomal removes the typical friction of setting up billing infrastructure. The platform uses the open x402 payment protocol to handle per-call micropayments starting at just $0.01 USDC, meaning developers can price each endpoint individually and receive funds directly without a middleman taking a percentage. AI agent builders and automation engineers can browse the open index to discover APIs they need and pay only for the calls they actually make, making it cost-effective for both sides. Loomal is especially valuable for indie developers, small API vendors, and anyone building agentic workflows who wants transparent, composable, and low-overhead monetization without locking into a traditional SaaS billing platform.
Key features
- List any MCP server or API in the open discovery index in about five minutes
- Per-call micropayments starting at $0.01 USDC via the x402 protocol
- Zero platform revenue cut - developers keep 100% of earnings
- Open payment-ready index for AI agents to discover and pay for APIs automatically
Pros & cons
- +No revenue share means developers keep all earnings from their API calls
- +Extremely low entry price per call at $0.01 USDC encourages broad adoption
- +Quick setup allows listing and monetizing an API in approximately five minutes
- −USDC-only payments may not suit developers or buyers who prefer traditional fiat billing
- −As a newer platform the discovery index may have limited listings and traffic initially
Pricing
Free to list APIs and MCP servers
$0.01 per API call (USDC)
Contact for custom arrangements
Who is it for
- →Monetizing a custom MCP server built for AI agent workflows
- →Selling access to a niche data or utility API without building billing from scratch
- →Discovering and paying for third-party APIs inside an autonomous AI agent pipeline
Frequently asked questions
Is Loomal free?
Yes, listing your API or MCP server on Loomal is completely free. Costs only arise when API calls are made, starting at $0.01 USDC per call as set by the endpoint owner.
What is Loomal best used for?
Loomal is best used for developers who want to monetize an API or MCP server quickly without building custom billing infrastructure, and for AI agent builders who need a simple way to discover and pay for APIs on a per-call basis.
What are the best alternatives to Loomal?
Alternatives include RapidAPI for traditional API marketplace listings, Stripe for custom payment integration, and Apify for monetizing web scraping and automation actors. None of these focus specifically on x402 micropayments for AI agent use cases the way Loomal does.
Is Loomal safe to use?
Loomal uses the open x402 payment protocol and USDC stablecoin transactions, which are verifiable on-chain. As with any newer platform, developers should review the documentation, test with small amounts, and follow standard API security practices before scaling.
How much does Loomal cost?
Listing on Loomal is free with no monthly fees and no platform revenue cut. Buyers pay per API call starting at $0.01 USDC, and the price per endpoint is set by the API provider.
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