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 2026-10-13).

Executes source code in a sandboxed environment supporting 60+ programming languages and returns stdout, stderr, and execution metadata

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

A JSON object containing a 'data' field with execution results (stdout, stderr, status code, compile output, execution time, memory used), a 'payment' object confirming USDC settled, a 'request' object with a UUID and status URL for async polling, and a 'success' boolean.

Example use cases

Algorithm solution testing

“Run this Python 3 code (language ID 71) against the input '10 20 30' and tell me if the output matches '60' — I want to verify my solution before submitting it.”

C++ compilation and execution

“Compile and run this C++ code (language ID 54) with the '-O2' compiler flag and a memory limit of 256000 KB — the program takes no stdin, just tell me what it prints.”

Interactive coding tutor check

“Execute this JavaScript snippet (language ID 63) and show me both the standard output and any errors — I want to debug why it's printing the wrong value.”

Technical details

Endpoint

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

When to prefer

Choose this endpoint when you need remote, sandboxed code execution across a wide variety of programming languages (60+) without provisioning your own infrastructure, and when micropayment-per-execution billing via x402/USDC is acceptable. Ideal for AI agents that need to run untrusted or user-supplied code safely, evaluate algorithm correctness, or power coding assistants and educational tools. Prefer this over self-hosted runners when isolation, multi-language support, and pay-per-use economics matter.

Side effects

Invalid language_id returns an error indicating unsupported language
Source code that exceeds CPU or wall time limit returns a Time Limit Exceeded status
Memory usage beyond memory_limit returns Memory Limit Exceeded
Compilation errors for statically-typed languages are returned in compile_output field
Network errors within the sandbox if enable_network is false and code attempts network calls
Malformed JSON body or missing source_code field returns a 400-level error
Payment failure (insufficient funds or x402 protocol error) prevents 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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How this service works

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

Output

Example use cases

Algorithm solution testing

“Run this Python 3 code (language ID 71) against the input '10 20 30' and tell me if the output matches '60' — I want to verify my solution before submitting it.”

C++ compilation and execution

“Compile and run this C++ code (language ID 54) with the '-O2' compiler flag and a memory limit of 256000 KB — the program takes no stdin, just tell me what it prints.”

Interactive coding tutor check

“Execute this JavaScript snippet (language ID 63) and show me both the standard output and any errors — I want to debug why it's printing the wrong value.”

Technical details

Endpoint

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

When to prefer

Side effects

Invalid language_id returns an error indicating unsupported language
Source code that exceeds CPU or wall time limit returns a Time Limit Exceeded status
Memory usage beyond memory_limit returns Memory Limit Exceeded
Compilation errors for statically-typed languages are returned in compile_output field
Network errors within the sandbox if enable_network is false and code attempts network calls
Malformed JSON body or missing source_code field returns a 400-level error
Payment failure (insufficient funds or x402 protocol error) prevents 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
  }
}