agent-exec URL Watch – Pay-Per-Use HTTP Polling with Condition Matching

x402

agent-exec URL Watch – Pay-Per-Use HTTP Polling with Condition Matching is a paid API for AI agents from agent-exec.45.67.221.128.sslip.io, paid per call via x402, $0.0058/call, status unknown (last checked 2026-10-02).

Registers a pay-per-use polling watch on a URL that fires when a specified condition (status change, body content, JSON path value, etc.) is met, returning a watch ID for subsequent free status checks.

Price / call$0.0058

Seller volume →—

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 check status for free at GET /watch/{id}), current status (active/matched/expired), payment receipt details, poll schedule timestamps (created, next poll due, TTL expiry), last observation, and — when matched — the timestamp the condition fired and any storage object ID if a storageKey was provided.

Example use cases

Wait for deployment to finish

“Watch https://ci.myapp.io/api/builds/482/status every 20 seconds for up to 15 minutes and tell me when the JSON path 'build.result' equals 'success' — save the matched result under 'build-482-done'.”

Detect a sold-out item restocking

“Poll https://store.example.com/api/products/99/availability every 60 seconds for up to 2 hours, and alert me the moment the response body contains the text 'in_stock'.”

Monitor third-party API for outage recovery

“Watch https://status.paymentprovider.com/api/status every 30 seconds for up to 30 minutes, and let me know as soon as the HTTP status changes from what it is right now — I want to know when they come back online.”

Technical details

Endpoint

POSThttps://agent-exec.45.67.221.128.sslip.io/watch?utm_source=zero.xyz

When to prefer

Choose this endpoint when an AI agent needs to wait for an asynchronous condition on an external HTTP endpoint — such as a deployment completing, a value changing in a JSON API, or text appearing on a page — without blocking or repeatedly calling the endpoint itself. It is especially suited for agent workflows that need to park a task until a remote state changes, pay only for what they use, and require no account setup. Prefer alternatives if you need real-time WebSocket-level latency, if the target URL requires authentication headers on each poll, or if you need to run code rather than observe a URL.

Side effects

Payment insufficient or invalid – watch not created, HTTP 402 returned
URL is unreachable or returns no response during polling – lastObservation reflects error, watch may expire without matching
Predicate misconfigured (e.g. jsonPathEquals with a path that doesn't exist) – watch polls but never matches, expires at TTL
ttlSeconds smaller than intervalSeconds – rejected with validation error
Network-less sandbox cannot reach private/internal URLs – watch polls but always fails
Watch expires (TTL elapsed) without condition firing – status becomes 'expired', no match recorded

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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