Two new x402 APIs for AI agents: composite agent-friendliness score + CSP report-uri live probe (2026-10-03)
Two new x402 APIs for AI agents I just shipped two more paid x402 endpoints in the URL Metadata API catalog. Both are at $0.0005 per call (USDC on Base), payment settles through OpenFacilitator, and both passed end-to-end verification against stripe.com and example.com. 1.
The article introduces two new x402 APIs designed to enhance AI agent functionality by providing insights into domain friendliness and CSP report-uri validation.
What happened
Two new x402 APIs were launched for AI agents. These APIs provide a composite AI-agent friendliness score for a domain and validate CSP report-uri endpoints. Both APIs are priced at $0.0005 per call and use USDC on Base for payment. They have been tested against real domains and offer actionable recommendations for improving domain friendliness and CSP endpoint accessibility.
Why it matters
These APIs are important for AI developers and web security professionals as they help in assessing the friendliness of domains for AI agents and validating CSP endpoints, which are crucial for security and compliance. They streamline the process of evaluating and improving domain configurations.
- The agent-friendliness API offers a single call to evaluate domain friendliness for AI agents.
- The CSP report-uri probe ensures that CSP endpoints are valid and accessible.
- Both APIs are priced affordably and use USDC on Base for payment.
- They are part of a larger x402 API catalog with various endpoints for different purposes.
The bigger picture
The APIs provide practical tools for AI agents to assess and improve domain configurations, ensuring better compatibility and security. They reduce the need for multiple manual checks and streamline the evaluation process.
The introduction of these two x402 APIs provides valuable tools for AI agents to assess domain friendliness and CSP endpoint validity, enhancing their functionality and security.
Technical details
- The agent-friendliness API evaluates 9 AI-relevant surfaces with weighted points.
- The CSP report-uri probe extracts and validates CSP endpoints by POSTing synthetic payloads.
- Both APIs use USDC on Base for payment and settle through OpenFacilitator.
- The APIs are accessible via GET requests to /.well-known/x402 and /llms.txt.
FAQ
What is the purpose of the agent-friendliness API?
The agent-friendliness API provides a composite score for a domain's AI-relevant surfaces, helping AI agents assess domain compatibility and receive actionable recommendations.
How does the CSP report-uri probe work?
The CSP report-uri probe extracts and validates CSP endpoints by POSTing synthetic payloads, checking for reachability, content-type acceptance, and authentication requirements.
What is the cost of using these APIs?
Both APIs are priced at $0.0005 per call and use USDC on Base for payment through OpenFacilitator.
How can I access these APIs?
These APIs are accessible via GET requests to /.well-known/x402 and /llms.txt, with a free first call available.
What are the benefits of using these APIs?
These APIs streamline the evaluation of domain configurations, ensuring better compatibility and security for AI agents, while reducing manual checks.
This summary and analysis were generated with AI from the original article and may contain errors. Read the original for the full story.
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Originally published by Dev.to AI on Oct 4, 2026.
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