agent-exec Sandboxed Code Execution

x402

agent-exec Sandboxed Code Execution is a paid API for AI agents from agent-exec.448c.org, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-10).

Executes Python or Node.js source code in an isolated, network-less sandbox and returns stdout, stderr, and exit code — pay-per-use via x402, no account required.

Price / call$0.001

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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

Returns an outcome field ('completed', 'timeout', or 'error'), captured stdout, captured stderr, exit code, execution duration in milliseconds, truncation flags, a structured error object (null on success), payment details (payer wallet, amount, network, transaction hash), and a signed receipt with tier, price, resource limits, and an output digest for auditability.

Example use cases

Agent-driven data transformation script

“Execute this Python 3 snippet that reads a JSON blob from stdin, transforms it, and prints the result — pass this JSON as stdin: {"values": [1, 3, 5, 7]} and the script is: `import json, sys; d=json.load(sys.stdin); print(sum(d['values']))`”

On-the-fly algorithm verification

“Run this Node.js snippet and tell me the output — I want to verify my binary search implementation: `function bs(arr,t){let l=0,r=arr.length-1;while(l<=r){let m=Math.floor((l+r)/2);if(arr[m]===t)return m;arr[m]<t?l=m+1:r=m-1;}return -1;} console.log(bs([1,3,5,7,9],7));`”

Automated test case runner for agent pipeline

“Run this Python 3 unit test script in a sandboxed environment and tell me whether it passes — the source is: `import unittest; class T(unittest.TestCase): def test_add(self): self.assertEqual(1+1,2) unittest.main()`”

Technical details

Endpoint

POSThttps://agent-exec.448c.org/execute?utm_source=zero.xyz

When to prefer

Choose this endpoint when an AI agent needs to execute untrusted or dynamically generated code snippets without managing accounts, API keys, or infrastructure. It is ideal for pay-per-use one-off computations, agent pipelines that need on-demand scripting capability, or when the caller holds a USDC wallet (x402) and wants frictionless access. Prefer it over managed cloud functions when there is no persistent state needed and the network-isolated sandbox is a feature rather than a limitation. Not suitable for code that requires internet access, persistent disk storage, or runtimes beyond python3 and node.

Side effects

SANDBOX_TIMEOUT — code ran too long; no refund
EXECUTION_MEMORY_LIMIT_EXCEEDED — script exceeded RAM budget
RUNTIME_UNSUPPORTED — runtime enum value not allowlisted; charged after payment attempt
REQUEST_MALFORMED — missing required fields source or runtime
PAYMENT_INVALID / PAYMENT_AMOUNT_INSUFFICIENT — x402 payment missing or underfunded
PAYER_RATE_LIMITED / PAYER_CONCURRENCY_LIMITED — too many requests from the same wallet
SERVICE_BUSY / SANDBOX_UNAVAILABLE — backend capacity issue; retry
EXECUTION_OUTPUT_LIMIT_EXCEEDED — stdout/stderr too large
PAYMENT_REPLAYED — same payment token submitted twice

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

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