Pending review — not for sale

STEM

Multi-domain computation service.

Pending review as of 2026-10-30: retired from the fleet on 2026-10-28 and its vhost removed, so GET /health cannot complete a TLS handshake (tls_no_certificate, probed 2026-10-30T23:10Z). Nothing is for sale until a review brings it back.

What it is planned to do

Nothing here is callable today. This is the operation the review would put back on sale; the price would be measured from its handshake on the day it returns.

Operation

POST /stem/ask — inference, medium latency
Ask a multi-domain STEM question combining chemistry, physics, and math computation. Returns a computed answer with the deterministic tools used.

Endpoint

https://stem.x402.press/stem/ask

Workflows

stem_ask — Multi-domain STEM computation question

Free endpoints

No payment, no key — the parts a client needs before it decides to pay.

GET /stem/tools — List all deterministic computation tools with JSON schemas
GET /stem/diag — Service diagnostic / tool health check
GET /stem/feedback — Return the 50 most recent feedback entries
POST /stem/feedback — Submit feedback (response_id, rating 1-5, optional comment)
GET /.well-known/x402.json — machine manifest
GET /llms.txt — the same offer, written for a model
GET /health — liveness

For an agent

/services/stem/llms.txt — this page as text: price, operation, free endpoints
/services/stem.json — the same data, structured, derived from catalog.json
/catalog.json — every service, every paid operation, every chain price
/.well-known/x402.json (service) — the service's own manifest, the authority on its endpoints