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execbox /execute/heavy
x402
execbox /execute/heavy is a paid API for AI agents from execbox.xyz, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-10).
Runs arbitrary source code in an isolated Judge0 sandbox, paid per execution via USDC micropayment on Base.
Price / call$0.01
Success—
StatusUnknown
How this service works
Heavy compute for intensive workloads. 30s CPU timeout, 1GB RAM. Use for recursive algorithms, large memory allocations, or long-running computations.
Output
A JSON object containing: stdout (program output), stderr (error output), exit_code, execution time in seconds, memory used in KB, and a status object with an ID and description (e.g. 'Accepted', 'Runtime Error', 'Time Limit Exceeded') plus the language name and ID.
Example use cases
Example prompt
“Can you run this Python 3 code (language ID 71) in a sandbox for me and show me what it prints? The code is: `print(sum(range(1, 101)))`”
Technical details
Endpoint
POSThttps://execbox.xyz/execute/heavy?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to execute arbitrary code in a secure, isolated sandbox without setting up local infrastructure, and you are comfortable paying $0.01 USDC per execution via the x402 protocol on Base. The /execute/heavy path is suited for more resource-intensive workloads. Prefer this over hosted REPL services when you need programmatic, pay-per-use access with structured JSON output including timing and memory metrics.
Side effects
- Payment not included or invalid — 402 Payment Required returned before execution
- Invalid language_id — Judge0 rejects unknown language identifiers
- Source code exceeds 100,000 character limit — request rejected
- Code attempts network access (sockets/HTTP) — fails silently or with runtime error since network is disabled
- Time limit exceeded — status returns 'Time Limit Exceeded' with no stdout
- Compilation error — stderr contains compiler output, exit_code non-zero, status is 'Compilation Error'
- Runtime error — exit_code non-zero, stderr populated, status is 'Runtime Error'
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| stdin | string | Standard input passed to the program (optional) |
| language_id | number | Judge0 language ID. GET /languages for valid IDs (e.g. 71=Python 3, 63=JavaScript, 50=C, 62=Java) |
| source_code | string | Source code to execute (max 100,000 characters). Network access is disabled — code that opens sockets or makes HTTP requests will fail. |
| compiler_options | string | Compiler flags passed to the compiler (e.g. "-O2 -Wall", "-std=c17"). Must start with "-". Leave empty or omit if unsure. Do NOT put natural language here. |
| command_line_arguments | string | Arguments passed to the compiled binary at runtime (e.g. "--input file.txt"). Leave empty or omit for most use cases. Do NOT put natural language here. |
Output
Schema · Response
{
"type": "json",
"example": {
"time": "18.542",
"memory": 1740,
"status": {
"id": 3,
"description": "Accepted"
},
"stderr": null,
"stdout": "102334155",
"language": {
"id": 50,
"name": "C (GCC 9.2.0)"
},
"exit_code": 0
}
}Tags
x402
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Zero review prompt (fires after every successful call)
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