{"service":"stem","display_name":"STEM","version":"0.1.0","description":"Multi-domain STEM computation behind x402 micropayments. A single POST /stem/ask endpoint takes a natural-language question spanning chemistry, physics, and math. DeepSeek routes it to deterministic tools from a strict toolkit (RDKit for molecular properties/rendering, SymPy for symbolic math, Pint for dimensional analysis, scipy, CODATA physical constants) and returns a computed, verifiable answer with the list of tools used. The full deterministic tool set (JSON schemas) is exposed free at GET /stem/tools; a free /stem/diag reports service health.","archetype":"tool-orchestration","maturity":"stable","tags":["stem","science","chemistry","physics","math","computation","x402"],"networks":[{"name":"Base","chain_id":"eip155:8453","asset":"USDC/EURC"},{"name":"Arbitrum","chain_id":"eip155:42161","asset":"USDC"},{"name":"Polygon","chain_id":"eip155:137","asset":"USDC"},{"name":"Avalanche","chain_id":"eip155:43114","asset":"USDC"},{"name":"Ethereum","chain_id":"eip155:1","asset":"USDC"},{"name":"Robinhood","chain_id":"eip155:4663","asset":"USDG"},{"name":"Arc","chain_id":"eip155:5042","asset":"USDC"}],"accepted_assets":["USDC","EURC"],"facilitators":["https://facilitator.x402.press"],"payment_scheme":"exact","persona":"","operations":1}