agent-exec URL Watch / Polling Monitor

x402

agent-exec URL Watch / Polling Monitor is a paid API for AI agents from agent-exec.448c.org, paid per call via x402, $0.0058/call, status unknown (last checked 2026-10-09).

Registers a paid, accountless HTTP polling watch that fires when a URL's response meets a specified condition (status code, body content, or JSON path value).

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 with a UUID watch ID (use it to query GET /watch/{id} for free), current status (active/matched/expired), payment confirmation including payer address and on-chain transaction, polling schedule timestamps, the predicate registered, and — once matched — the matchedAt timestamp and optionally the storage object ID where the result was delivered.

Example use cases

Wait for order fulfillment status

“Watch https://shop.example.com/api/orders/9981 every 60 seconds for up to 30 minutes and alert me when the JSON field 'fulfillment.state' equals 'complete'.”

Detect site recovery after outage

“Start polling https://status.myapp.io/health every 20 seconds for up to 5 minutes and tell me as soon as the HTTP status code changes from what it is right now.”

Trigger on content appearing on a page

“Poll https://conference.example.org/schedule every 120 seconds for up to 2 hours and fire when the response body contains the text 'registration open'.”

Technical details

Endpoint

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

When to prefer

Choose this endpoint when your agent needs to asynchronously monitor an external HTTP resource until a specific condition is met — especially when you want fire-and-forget behavior without maintaining a long-lived connection. It is ideal for event-driven workflows where you don't know exactly when a condition will be true (order status, feature flags, availability, content publication). The accountless, pay-per-use x402 model makes it suitable for agent pipelines that operate without persistent credentials. Prefer it over polling in your own agent loop when you want to offload the polling cost and complexity, or when the polling window may outlast a single agent run.

Side effects

Payment insufficient or invalid — watch not created, HTTP 402 returned
URL is unreachable or returns errors during polling — lastObservation reflects the error state
TTL expires before predicate matches — status transitions to 'expired'
intervalSeconds larger than ttlSeconds — request rejected as invalid
Malformed predicate object with missing required fields — request rejected
jsonPathEquals predicate on a non-JSON response — noted in lastObservation as WATCH_JSONPATH_BODY_NOT_JSON
Network isolation means agent-exec cannot reach internal/private URLs — polling silently fails

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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