Judge0 via Locus x402 — Code Execution

x402

Judge0 via Locus x402 — Code Execution is a paid API for AI agents from judge0.x402.paywithlocus.com, paid per call via x402, $0.006/call, status unknown (last checked 2026-10-10).

Executes source code in a sandboxed environment across 60+ programming languages and returns the program output

Price / call$0.006

Seller volume →—

Success—

StatusUnknown

How this service works

Online code execution — run source code in 60+ programming languages with sandboxed isolation.

Output

Returns a JSON object containing the program's stdout, stderr, execution status (accepted, wrong answer, time limit exceeded, runtime error, etc.), runtime and memory usage metrics, plus payment confirmation details (settled USDC amount) and a request ID for status polling.

Example use cases

Automated coding challenge judge

“Run this C++ solution (language ID 54) against the input '5\n1 2 3 4 5' and check whether the output matches '15' — I need to know if my solution passes the test case.”

Live code snippet in docs pipeline

“Execute this JavaScript snippet (language ID 63) from our documentation to verify it still produces the expected output 'Hello, World!' — flag it if the output doesn't match.”

Python data processing in agent workflow

“Run this Python 3 script (language ID 71) with compiler flag '-O2' and stdin '10 20 30', then return whatever it prints to stdout so I can use the result in the next step.”

Technical details

Endpoint

POSThttps://judge0.x402.paywithlocus.com/judge0/submit-code?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need to execute arbitrary source code in a sandboxed, isolated environment without provisioning your own infrastructure. It is ideal for AI agents that need to validate code correctness, run user-submitted scripts, power online judges for competitive programming, or produce computed results from code within an automated workflow. Supports 60+ languages including Python, JavaScript, C++, Java, and many more. Prefer this over self-hosted runners when you want per-call micropayment billing via x402 and zero infrastructure management.

Side effects

Invalid language_id returns an error or unsupported language response
Source code that exceeds memory_limit results in a memory limit exceeded status
Programs running longer than cpu_time_limit or wall_time_limit return a time limit exceeded status
Compilation errors in statically typed languages (C++, Java) return a compile error status with compiler output
Runtime errors (exceptions, segfaults) return a runtime error status
Malformed JSON body or missing source_code field returns a 400-level error
Insufficient USDC payment or x402 payment failure blocks execution

Input

Schema · Request body

Field	Type	Description
stdin	string
language_id	integer
source_code	string
stack_limit	number
memory_limit	number
cpu_time_limit	number
enable_network	boolean
expected_output	string
wall_time_limit	number
compiler_options	string
command_line_arguments	string
redirect_stderr_to_stdout	boolean

Output

Schema · Response

{
  "type": "json",
  "example": {
    "data": {},
    "payment": {
      "scheme": "exact",
      "settledUsdc": "0.001000",
      "authorizedMaxUsdc": "0.001000"
    },
    "request": {
      "id": "00000000-0000-4000-8000-000000000000",
      "statusUrl": "/requests/00000000-0000-4000-8000-000000000000"
    },
    "success": true
  }
}

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