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agent-exec Storage Object Replace
x402
agent-exec Storage Object Replace is a paid API for AI agents from agent-exec.448c.org, paid per call via x402, $0.0051/call, status unknown (last checked 2026-10-10).
Replaces the content of an existing storage object in-place, extending or preserving its retention window, with pay-per-use USDC micropayment and no account required.
Price / call$0.0051
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 the storage object's new ID, selected plan, new size in bytes, new expiry timestamp (Unix ms), the previous size and expiry before replacement, the resulting label, and a payment object containing the asset, payer wallet address, amount charged in atomic USDC units, network, and on-chain transaction hash.
Example use cases
Update agent checkpoint state
“My agent has been running and needs to update its saved checkpoint — replace the content at storage ID 'chk-007' with the new JSON state blob using the medium plan, and keep the label 'checkpoint-v2'.”
Renew stored code before expiry
“The code object at ID 'run-456' is about to expire — overwrite it with the same updated source and use the small plan so it gets the longest possible retention window.”
Rename a stored artifact during update
“Replace the content of storage object 'artifact-99' with the new build output, upgrade to the large plan to fit the bigger file, and rename the label to 'build-final'.”
Technical details
Endpoint
POSThttps://agent-exec.448c.org/storage/%7Bid%7D/replace?utm_source=zero.xyzWhen to prefer
Use this endpoint when you already have an existing storage object ID and want to overwrite its content in place, preserving the same ID and optionally extending retention — rather than creating a brand-new object. It is the right choice when an agent needs to update checkpoint state, replace code artifacts, or re-park data under a known identifier without re-registering or signing up for an account.
Side effects
- Plan too small for new body — service auto-selects smallest fitting plan and returns 402 quoting exact required plan
- Invalid or expired object ID — object not found
- Payment failure — insufficient funds or invalid x402 payment header
- Malformed request body — missing or invalid content
- Network or sandbox unavailability — 5xx error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| plan | string | Optional; omitted, misspelled or too small for the new body, you get the smallest plan it fits, and the 402 quotes exactly that. Which plan to buy. Priced as a fresh store, because the content is entirely new. Its byte allowance must cover the NEW body, and its window is compared against what the object already has -- the longer of the two wins, so replacing early never shortens your retention. |
| label | string | Three-way. OMIT it to keep the object's current label (the usual case -- you are re-parking state under a name you already know). Send `?label=name` to rename. Send it empty (`?label=`) to clear it. |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| idrequired | string | |
| planrequired | string | |
| sizerequired | integer | The new content size, in bytes. |
| labelrequired | — | The resulting label -- unchanged, renamed, or cleared, per the `?label=` sent. |
| paymentrequired | object | |
| expiresAtrequired | integer | Unix ms the object is free again, after this replacement. |
| previousSizerequired | integer | The size of the content that was overwritten, in bytes. |
| previousExpiresAtrequired | integer | Unix ms the object would have expired before this replacement. |
Tags
x402
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