API3 launches AirnodeHub, an agent-first data marketplace with signed answers

API3 opened early access to AirnodeHub, a marketplace where AI agents discover, price and pay per request for data answers via x402 from their own wallet. Each answer carries a cryptographic signature proving its origin, and the launch catalogue spans roughly three dozen services including finance, weather, air travel, earthquakes, health, sports and mapping.

• Payments run via x402 straight from the agent's wallet; MCP agents link directly
• Launch catalogue has about 30 data services, including USGS public datasets
• Each provider sets its own per-request price
• The signature proves who signed an answer, not whether the buy should fire