agent-exec URL Watch / Polling Monitor

x402

agent-exec URL Watch / Polling Monitor is a paid API for AI agents from agent-exec.448c.net, paid per call via x402, $0.0058/call, status unknown (last checked 2026-10-11).

Registers a pay-per-use HTTP polling watch that fires when a specified condition is met on a remote URL, returning a watch ID and status.

Price / call$0.0058

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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 a watch object containing a UUID watch ID, current status (active/matched/expired), payment details (payer, amount, transaction hash), predicate, interval and TTL settings, creation and expiry timestamps, next scheduled poll time, overdue flag, last observation details, and if a storageKey was given, the ID of the storage object where matched data was delivered.

Example use cases

Wait for deployment to go live

“Keep polling https://myapp.example.com/health every 15 seconds for up to 5 minutes, and tell me when it returns HTTP 200 — store the result under 'deploy-check'.”

Detect price drop on an API

“Watch https://api.shop.com/products/42/price every 60 seconds for 2 hours and fire when the JSON field 'price' equals '19.99'.”

Monitor third-party service recovery

“Poll https://status.thirdparty.com/api every 30 seconds for up to 15 minutes and let me know the moment the body contains the word 'operational'.”

Technical details

Endpoint

POSThttps://agent-exec.448c.net/watch?utm_source=zero.xyz

When to prefer

Choose this endpoint when an AI agent needs to asynchronously wait for a remote HTTP condition to become true without blocking — especially useful for polling deployment readiness, service recovery, or waiting for a third-party API value to change. It is preferable to running a busy-wait loop in code, and uniquely suited when no webhook infrastructure is available on the target system. The pay-per-use, accountless model makes it ideal for ad-hoc agent workflows.

Side effects

Payment insufficient or invalid — HTTP 402 returned, watch not created
URL is not reachable or returns errors — watch stays active until TTL expires without matching
TTL expires before predicate fires — status transitions to 'expired' with no match
Invalid predicate type specified — request rejected with schema validation error
intervalSeconds greater than ttlSeconds — request rejected
JSON path in predicate doesn't exist in response body — condition never matches

Input

Schema · Request body

Field	Type	Description
urlrequired	string	Absolute http(s) URL to poll.
predicaterequired	object	Exactly one of: {type:"statusChanged"} / {type:"statusEquals",status} / {type:"bodyContains",value} / {type:"bodyNotContains",value} / {type:"jsonPathEquals",path,value} / {type:"jsonPathNotEquals",path,value} / {type:"changedFromNow",path?}. `path` is a dotted path into a JSON response body.
storageKey	string	Optional: deliver a matched observation into /storage under this label, on the wallet that paid.
ttlSecondsrequired	integer	Stop after this many seconds if the condition never fires; at least intervalSeconds.
intervalSecondsrequired	integer	Seconds between polls.

Output

Schema · Response

Field	Type	Description
idrequired	string	Keep this: it is how anyone reads the watch back, free, at GET /watch/{id}.
urlrequired	string
statusrequired	string
overduerequired	boolean	true when an active watch has missed its next poll.
paymentrequired	object
baseline	—	changedFromNow's registration-time snapshot, verbatim.
createdAtrequired	integer	Unix ms.
matchedAt	—	Unix ms the condition fired, or null.
predicaterequired	object
storageKey	—
ttlSecondsrequired	integer
lastPolledAt	—
ttlExpiresAtrequired	integer	Unix ms polling stops if the condition never fires.
nextPollDueAtrequired	integer
intervalSecondsrequired	integer
lastObservation	—	The last poll: status, whether it matched, and any WATCH_JSONPATH_BODY_NOT_JSON note.
deliveredObjectId	—	The /storage object a matched storageKey watch was delivered to.

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