# Services from webref.johnaio281.workers.dev on Zero

> webref.johnaio281.workers.dev serves 14 paid API services for AI agents, indexed by Zero. Each is callable per call with payment handled by Zero.

Canonical page: https://www.zero.xyz/host/webref.johnaio281.workers.dev
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/webref.johnaio281.workers.dev/health.json

## Services

- [WebRef Content-Type Advice](https://www.zero.xyz/c/webref-content-type-advice-d2f624d3/llms.txt): $0.003/call via x402. Returns content-type matching and MIME type guidance for HTTP GET, HEAD, or DELETE requests, including appropriate Accept headers and endpoint kind classification
- [WebRef Duration Converter](https://www.zero.xyz/c/webref-duration-converter-a6a8c792/llms.txt): $0.003/call via x402. Converts a numeric duration value between time units (milliseconds, seconds, minutes, hours, days, weeks)
- [WebRef MIME Type Lookup](https://www.zero.xyz/c/webref-mime-type-lookup-03954013/llms.txt): $0.003/call via x402. Looks up MIME type information for a file extension or content-type string, returning canonical type, subtypes, and content-type matching guidance for HTTP responses
- [WebRef HTTP Method Safety & Idempotency Lookup](https://www.zero.xyz/c/webref-http-method-safety-idempotency-lookup-47a13eee/llms.txt): $0.003/call via x402. Returns safety, idempotency, and semantic metadata for a given HTTP request method (GET, HEAD, or DELETE)
- [WebRef Time Describe Instant](https://www.zero.xyz/c/webref-time-describe-instant-bafd104a/llms.txt): $0.003/call via x402. Returns a human-readable description of a specific moment in time, including weekday, business-day status, and timezone context
- [WebRef Time Add Duration](https://www.zero.xyz/c/webref-time-add-duration-15636143/llms.txt): $0.003/call via x402. Adds a specified duration (milliseconds, seconds, minutes, hours, days, or weeks) to a given timestamp and returns the resulting datetime
- [WebRef HTTP Retry Advice](https://www.zero.xyz/c/webref-http-retry-advice-b381ccb2/llms.txt): $0.005/call via x402. Returns retry semantics and client action guidance for a given HTTP status code and request method combination
- [WebRef Business Days Between](https://www.zero.xyz/c/webref-business-days-between-06dc2307/llms.txt): $0.005/call via x402. Calculates the number of business days between two dates, excluding weekends
- [WebRef Time Until](https://www.zero.xyz/c/webref-time-until-5ff71dff/llms.txt): $0.003/call via x402. Calculates the duration or time remaining from one moment to another, returning deadline arithmetic results like how long until a target datetime.
- [WebRef Weekday Lookup](https://www.zero.xyz/c/webref-weekday-lookup-0f334647/llms.txt): $0.003/call via x402. Returns the day-of-week name for a given date, with configurable week-start (Sunday or Monday)
- [WebRef List MIME Types](https://www.zero.xyz/c/webref-list-mime-types-dd607b20/llms.txt): $0.003/call via x402. Returns a searchable list of MIME types with content-type matching details for HTTP request/response handling
- [WebRef HTTP Status Code Lookup](https://www.zero.xyz/c/webref-http-status-code-lookup-778b1750/llms.txt): $0.003/call via x402. Returns HTTP status code details for a given code and HTTP method, including client action guidance, retry semantics, and decision summaries.
- [WebRef HTTP Status for Situation](https://www.zero.xyz/c/webref-http-status-for-situation-d1864d3a/llms.txt): $0.005/call via x402. Returns the appropriate HTTP status code and client action guidance for a given HTTP method and situation
- [WebRef Unix Timestamp Lookup](https://www.zero.xyz/c/webref-unix-timestamp-lookup-881e92f7/llms.txt): $0.003/call via x402. Returns the current Unix timestamp (and optionally parses a date or existing timestamp) for use in deadline arithmetic and time calculations

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

- [Zero catalog index](https://www.zero.xyz/llms.txt)