{"id":"0beba91f-7bcd-471c-9706-661d446abf85","shortId":"EksDDv","kind":"mpp","title":"List all supported programming languages available on the Judge0 sandboxed code execution service.","tagline":"List all supported programming languages available on the Judge0 sandboxed code execution service.","description":"The Judge0 List Languages endpoint returns the full catalog of programming languages supported by the Judge0 online code execution engine, served through the Locus MPP (Micropayment Protocol) gateway. This is a utility endpoint designed to help callers discover valid language IDs before submitting code for execution via the sibling execute-code or submit-code endpoints.\n\nThe endpoint is part of a broader Judge0 service suite that includes synchronous code execution, asynchronous submission with polling, submission retrieval, and status listing. Judge0 itself supports 60+ programming languages with sandboxed isolation. Common language IDs include 71 (Python 3), 63 (JavaScript/Node.js), 54 (C++), and 62 (Java). The list-languages call provides the authoritative mapping of IDs to language names and versions.\n\nPayment is handled via the Tempo method on the MPP protocol. Each call to list-languages costs 5,000 base units of pathUSD (currency address 0x20c000000000000000000000b9537d11c60e8b50), which at 6 decimals equals $0.005 per request. The endpoint accepts POST requests only — HEAD and GET probes return 404, which is expected behavior for this MPP gateway. No request body is required for this particular call.","tags":["code-execution","sandbox","programming-languages"],"capabilities":["list-languages","code-execution-metadata","sandboxed-compute","mpp-tempo-payment","judge0-api"],"categories":["compute"],"synonyms":["Judge0 languages","code execution languages","programming language list","Judge0 API","online compiler languages","sandbox language catalog","supported languages endpoint"],"warnings":["Probe used HEAD/GET which returned 404; the endpoint is POST-only per the OpenAPI spec, so liveness is not directly confirmed","No response schema or example response is documented for list-languages","Currency address 0x20c000000000000000000000b9537d11c60e8b50 is assumed to be pathUSD with 6 decimals based on the Tempo method context; if decimals differ, the stated price of $0.005 would be incorrect"],"endpointUrl":"https://judge0.mpp.paywithlocus.com/judge0/list-languages","protocol":"mpp","transport":"http","auth":{"type":"mpp","details":{"realm":"judge0.mpp.paywithlocus.com","intent":"charge","method":"tempo","service_methods":{"tempo":{"assets":["0x20c000000000000000000000b9537d11c60e8b50"],"intents":["charge"]}}}},"qualityScore":"0.550","qualityRationale":"The OpenAPI spec is well-structured with clear path definitions and payment info for all sibling endpoints, but the list-languages endpoint itself has no response schema or example response. The probe returned 404 because it tried HEAD/GET rather than POST, so liveness is not confirmed but likely. No crawled docs provided useful 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