Superstables: Find APIs your AI agent can pay for in stablecoins

Hey Product Hunt 👋 Agents are starting to pay for things themselves, through HTTP 402 payment challenges over protocols like x402 and MPP. But finding which services actually accept those payments is still guesswork. Superstables is an index of them: APIs, data feeds, GPU and compute providers, tools, and other agents. • We probe endpoints on a rolling schedule and show whether each one returned a payment challenge at its last check. • You can filter by rail, chain, asset and price. • It’s free with no account. Use the web directory, the JSON API, the MCP server (find_services, get_service, get_stats), or ask in plain English. • There’s also an early preview where an agent buys a test service and the owner approves the payment from their own wallet. It’s testnet only for now. If you run a paid API, you can submit it for listing. I’d love to hear which services you’d want your agent to find.