Decixa builds a verified API directory for AI agents
Koki Uchiyama introduces Decixa, an MCP-compatible service that probes and ranks x402-enabled APIs so AI agents can autonomously discover and select reliable endpoints without hardcoded configurations.
Score breakdown
Developers building AI agents that need to call external APIs can use Decixa's MCP integration or `resolve` endpoint to replace brittle hardcoded endpoints with dynamically ranked, verified API options.
- 01Decixa was built by koki uchiyama and is described as a discovery and ranking layer for x402-enabled APIs.
- 02Over 20,000 x402 endpoints were collected and probed; only 3,800+ returned a valid 402 payment response and are indexed as verified live.
- 03Decixa ranks APIs by capability, cost, latency, and trust score so agents can make autonomous decisions without human input.
Koki Uchiyama draws a direct parallel between the early web's information chaos and the current state of AI agent API discovery. Just as Yahoo's manual directory couldn't scale and Google solved the quality problem with PageRank, the x402 API ecosystem has a similar gap: thousands of endpoints exist, but agents can't evaluate them, so developers resort to hardcoding a single endpoint and hoping it works. Decixa is presented as the infrastructure layer meant to close that gap.
Of the 20,000+ endpoints collected, only 3,800+ passed verification and are surfaced to agents.
The service operates on two levels simultaneously: a directory layer that collects every x402 endpoint it can find, and a quality layer that probes each one to verify it actually returns a valid 402 payment response and tracks uptime over time. Of the 20,000+ endpoints collected, only 3,800+ passed verification and are surfaced to agents. When an agent queries Decixa with an intent — such as "extract social media posts by keyword" — it receives a ranked list of APIs with capability, cost, latency, and trust score metadata, giving the agent everything it needs to make an autonomous decision.
Developers can integrate Decixa into Claude Code or other agent frameworks with a single command (`npx decixa-mcp`), or call the `resolve` endpoint directly via a `curl` POST request. The post notes that the x402 ecosystem is still young and the quality problem will intensify as the number of endpoints grows, framing Decixa's current work as foundational infrastructure built while the ecosystem is still small enough to probe completely.
Key facts
- 01Decixa was built by koki uchiyama and is described as a discovery and ranking layer for x402-enabled APIs.
- 02Over 20,000 x402 endpoints were collected and probed; only 3,800+ returned a valid 402 payment response and are indexed as verified live.
- 03Decixa ranks APIs by capability, cost, latency, and trust score so agents can make autonomous decisions without human input.
- 04Agents can integrate Decixa via `npx decixa-mcp` for use in Claude Code or similar environments.
- 05A `resolve` endpoint accepts a natural-language intent via POST and returns a ranked list of matching APIs.
- 06The post frames hardcoding a single API endpoint as the current 'Yahoo era' of AI agent API discovery.
- 07x402 is described as a payment protocol that allows AI agents to call and pay for APIs autonomously without human intervention.