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Crypto Signal Change Check (Lightweight Poll)
x402
Crypto Signal Change Check (Lightweight Poll) is a paid API for AI agents from agentdata-api.sander-van-aard.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Polls whether a previously retrieved crypto opportunity signal has changed since a known version, returning change types, live status, and next-check timing — without resending the full payload.
Price / call$0.01
Success—
StatusUnknown
How this service works
Cheap polling for a crypto opportunity you already retrieved: send signal_id plus the known_version you hold and receive whether it changed, the current version, live status (ACTIVE/STALE/INVALIDATED), which change types occurred (score, classification, entry zone, economics, execution blockers, status) and next_check_after — no full signal payload. Built for monitoring an active opportunity over time. Market intelligence only: no execution, no custody, no position sizing. Paid per request.
Output
Returns a changed boolean, the current version number, live status (ACTIVE, STALE, or INVALIDATED), an array of change type labels (e.g. score, classification, entry_zone, economics, execution_blockers, status), and a next_check_after timestamp indicating when to poll again. No full signal payload is included.
Example use cases
Active trade setup monitoring loop
“I'm tracking crypto signal def456 that I fetched earlier at version 3 — can you check if anything has changed, and tell me whether it's still ACTIVE or has been invalidated?”
Entry zone change detection
“Has the entry zone or the opportunity score on signal xyz789 changed since I last saw it at version 12? I don't need the full signal, just what's different and when I should check again.”
Automated signal staleness guard
“Before my agent acts on signal qrs321 at version 5, quickly verify whether its status is still ACTIVE or if any execution blockers have appeared since that version.”
Technical details
Endpoint
POSThttps://agentdata-api.sander-van-aard.workers.dev/crypto/checkWhen to prefer
Choose this endpoint when you have already retrieved a full crypto signal via /crypto/verdict or /crypto/signal and need to efficiently monitor it over time without paying for repeated full-payload fetches. It is strictly cheaper and faster than re-calling the full signal endpoint. Use it in polling loops where bandwidth and cost matter. Do not use it as your first call — you need a valid signal_id and known_version first.
Side effects
- Unknown signal_id returns a not-found error
- Missing required fields (signal_id or known_version) returns a validation error
- Payment not attached or insufficient returns HTTP 402
- Upstream signal system unavailable may return a 503 or timeout
- Stale known_version that predates system history may return an error or force a full re-fetch
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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