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Agent-Exec Code Execution Sandbox
x402
Agent-Exec Code Execution Sandbox is a paid API for AI agents from agent-exec.45.67.221.128.sslip.io, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Executes Python 3 or Node.js code in an isolated, network-less sandbox and returns stdout, stderr, and exit code as JSON
Price / call$0.001
Success—
StatusUnknown
How this service works
Accountless, pay-per-use code execution for software agents: submit source code, get stdout, stderr and exit code back from an isolated, network-less sandbox. No account, no API key -- possession of valid payment is sufficient.
Output
A JSON object containing three fields: stdout (the standard output produced by the script), stderr (any error messages or warnings), and exit code (integer indicating success or failure — 0 for success, non-zero for errors)
Example use cases
Quick Python math computation
“Calculate the first 50 Fibonacci numbers using this Python script and give me the output: `a,b=0,1
for _ in range(50): print(a); a,b=b,a+b`”
Node.js JSON transformation script
“Run this Node.js code in a sandbox and return what it prints: `const data={scores:[88,92,75,100]}; console.log(JSON.stringify({avg: data.scores.reduce((a,b)=>a+b)/data.scores.length}))`”
Validate algorithm logic output
“Execute this Python 3 code in a safe sandbox and tell me what gets printed and whether it exits cleanly: `def is_prime(n): return all(n%i!=0 for i in range(2,int(n**0.5)+1)); print([x for x in range(2,30) if is_prime(x)])`”
Technical details
Endpoint
POSThttps://agent-exec.45.67.221.128.sslip.io/executeWhen to prefer
Choose this endpoint when you need to run a small Python 3 or Node.js code snippet in a fully isolated, network-less environment with no account setup required and pay-per-use pricing via x402. Ideal for agents that need on-demand computation, algorithm testing, or data transformation without provisioning any infrastructure. Prefer over cloud function services when you need instant, no-registration, micro-priced execution.
Side effects
- Script syntax error returns non-zero exit code with stderr containing the traceback
- Network calls inside the sandbox fail because it is network-less — any HTTP request or socket use will error
- Execution timeout if script runs too long
- Unsupported language identifier results in error
- Payment failure over x402 returns 402 response before code is run
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| files | object | Extra files seeded alongside the entry file, as relative-path -> content. |
| stdin | string | Written to the payload's stdin, then stdin is closed. |
| limits | object | Per-request resource budget. Every field is optional; an omitted field takes its documented default. A field outside [minimum, maximum] is rejected outright, never clamped. |
| sourcerequired | string | Program source, written to the runtime's entry file. |
| runtimerequired | string | Must be one of the allowlisted runtimes named here -- this enum (and x-runtimes) is the free way to learn the set. An unsupported value is refused only AFTER a payment attempt, as RUNTIME_UNSUPPORTED, not before. |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| errorrequired | — | Null when `outcome` is "completed". |
| stderrrequired | string | |
| stdoutrequired | string | |
| outcomerequired | string | |
| paymentrequired | object | The payer is surfaced because it is this service's notion of identity (build.md: the wallet is the account) -- per-payer rate limits and standing are built on it. |
| receiptrequired | object | Cryptographically binds this exact payment to this exact request and this exact output (src/receipts/receipt.ts) -- so the caller can recompute `requestDigest`/`outputDigest` itself without trusting this service's parsing, rather than a mere echo of what was already charged. |
| exitCoderequired | — | |
| truncatedrequired | object | |
| durationMsrequired | number |
Tags
x402
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