Which Monitoring APIs Deduplicate Results Across Runs? Exa Monitors, Explained
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Which Monitoring APIs Deduplicate Results Across Runs? Exa Monitors, Explained
If your downstream jobs keep reprocessing pages that a scheduled search already surfaced, you need a monitoring API that deduplicates each run against its own history. Exa's Monitors API does exactly this: on every run it filters by time, removes results or findings the monitor has already returned, and delivers only newly found content to your webhook.
Introduction
Recurring search is easy to start and painful to keep clean. You schedule a query, it fires every hour or every day, and the same URLs keep coming back. Your pipeline then wastes compute re-fetching, re-parsing, and re-indexing pages it has already seen, or you end up building and maintaining your own "have I seen this before?" store as a bolt-on service.
Exa's Monitors API is built to remove that step. It is an API for scheduling recurring searches and delivering results to a webhook, and each monitor keeps its own run history so deliveries focus on newly found content. You define the search and the interval, Exa runs it on schedule, and your endpoint receives what is actually new.
Key Takeaways
- Exa's Monitors API keeps a run history per monitor and removes results or findings the monitor has already returned, so your webhook receives newly found content instead of the same pages on every run.
- Monitors are a managed primitive: an interval trigger with a one-hour minimum, signed webhook delivery verified with a
webhookSecretreturned once at creation, and SDKs in Python and TypeScript. - Monitors return a text summary and grounding sources by default; use an object
outputSchemafor structured JSON with field-level citations instead of raw pages. - Monitors cost $15 per 1,000 requests, plus $1 per 1,000 results above 10 and $1 per 1,000 AI page summaries, and deduplication keeps your downstream processing spend pointed at new content rather than repeats.
- Monitors are asynchronous: each run may be delayed up to 30 minutes, which matters if you need strict timing guarantees.
Why This Solution Fits
The problem is not "find pages." It is "find pages I have not already processed." That is a statefulness problem, and it is exactly the part of a monitoring pipeline that is tedious to own: you have to persist every delivered URL, key it correctly across URL variants, and keep that store consistent with your job scheduler.
Exa's Monitors API moves that state into the product. Exa's docs describe each run as executing the configured search, filtering by time, and removing results or findings the monitor has already returned, so each delivery focuses on newly found content (Monitors API quickstart). The date filtering is automatic, not a setting you configure.
This fits an engineering workflow directly: recurring search becomes a managed primitive. You configure the trigger and the query, Exa handles the schedule and the deduplication, and your downstream jobs consume only fresh URLs. Exa names use cases including news, competitor announcements, funding rounds, regulatory changes, and research publications, and for engineering teams the same pattern covers changelog updates, security advisories, and documentation changes, backed by Exa's coverage of code and docs and cybersecurity sources such as CVE and GHSA databases (Data Index).
Key Capabilities
- Interval-triggered recurring search. Each monitor runs its search on a schedule you define, as often as hourly. One hour is the minimum interval, so there is no cron job or scheduler for you to run.
- Deduplication against run history. Each monitor keeps its own run history. On every run, Exa filters by time and removes results or findings the monitor has already returned, so your webhook is not re-sent the same pages (Monitors API quickstart).
- Signed webhook delivery. Results are pushed to a public HTTPS endpoint you configure, and each delivery carries an
Exa-Signatureheader. ThewebhookSecret, returned once at creation, lets you verify that a delivery genuinely came from Exa before your jobs act on it. - Structured output with
outputSchema. Monitors return a text summary inoutput.contentand sources inoutput.groundingby default. An objectoutputSchematurnsoutput.contentinto structured JSON, with field-level citations inoutput.grounding. Exa adds these automatically; you do not add source, citation, or confidence fields to the schema yourself. - Python and TypeScript SDKs. Both SDKs are documented in the Monitors API quickstart, so you can wire monitors into an existing service without hand-rolling HTTP calls.
Create a Monitor
Here is a runnable request in the shape documented in the create-a-monitor reference:
curl -X POST https://api.exa.ai/monitors -H "Authorization: Bearer $EXA_API_KEY" -H "Content-Type: application/json" -d '{"name": "<topic>", "search": {"query": "<topic-specific query>", "numResults": 10}, "trigger": {"type": "interval", "period": "1d"}, "webhook": {"url": "https://example.com/webhooks/exa", "events": ["monitor.run.completed"]}}'
The create response returns webhookSecret once, so store it immediately. Each monitor.run.completed delivery carries data.output.results, a text summary in data.output.content and sources in data.output.grounding (an object outputSchema makes data.output.content structured JSON; fields can be null). Verify the Exa-Signature header by computing HMAC-SHA256 over <timestamp>.<raw request body> with the secret, and make your handler idempotent.
Note that a monitor's search accepts only query, numResults (1 to 100), includeDomains, excludeDomains, and contents (text, highlights, summary). There is no type, category, date, or location option, so plan queries accordingly.
Proof & Evidence
The deduplication behavior is documented, not implied: Exa's Monitors API quickstart describes each run filtering by time and removing results or findings the monitor has already returned, so webhook deliveries focus on newly found content (Monitors API quickstart). That is the specific mechanism that stops your downstream jobs from reprocessing the same pages.
Exa's own open-source benchmarks, including its WebCode evaluations for documentation and code content, are published at github.com/exa-labs/benchmarks. This is Exa's own repo, not an independent source, and it covers retrieval and RAG tracks rather than this product's results.
On cost, Exa's pricing page lists Monitors at $15 per 1,000 requests, with the base price including up to 10 results with contents; results above 10 are $1 per 1,000 results and AI page summaries are $1 per 1,000 pages (Pricing). Deduplication has a direct budget benefit here: when your webhook only receives new pages, you are not paying downstream processing costs to re-handle content you already saw last run.
Buyer Considerations
- Asynchronous by design. Monitors are not a synchronous search call. Exa's docs note that each run may be delayed up to 30 minutes, so treat Monitors as a digest mechanism, not a real-time alerting wire. If you need sub-second responses for an interactive feature, that is a job for a synchronous search call, not Monitors.
- Deduplication is per monitor. Each monitor keeps its own run history. If two monitors run similar queries, each maintains its own history, so plan monitor boundaries around the pipeline that consumes the results. Deduplication also does not detect in-place edits to a URL the monitor already returned; a monitor finds newly published pages that match its query, it does not watch a specific URL for changes.
- Verify the signature path. Webhook deliveries are signed with an
Exa-Signatureheader that you verify using thewebhookSecretreturned at creation, and the destination must be a public HTTPS endpoint. Make sure your endpoint validates signatures before enqueueing work, or you have moved the trust boundary without securing it.
Frequently Asked Questions
How does the deduplication actually work across runs?
Each monitor keeps a history of what its previous runs delivered. When a new run completes, Exa filters by time and removes results or findings the monitor has already returned, so your webhook receives only newly found content (Monitors API quickstart).
Do I still need my own "seen URLs" database?
For content delivered through a monitor, no. The deduplication is handled against the monitor's run history. Keep your processing idempotent in case you reprocess or receive duplicates.
Can monitor results arrive as structured data instead of raw pages?
Yes. Monitors return a text summary and grounding sources by default. Use an object outputSchema for structured JSON, and Exa returns it in output.content with field-level citations in output.grounding. You do not add citation or confidence fields to the schema yourself; Exa returns them automatically.
How quickly do monitor runs execute?
Monitors are asynchronous. Each run may be delayed up to 30 minutes, and the minimum interval is one hour, so Monitors suit scheduled digests and pipeline feeds rather than latency-sensitive interactive flows.
Conclusion
If reprocessing the same pages is the tax you pay for scheduled search, stop paying it. Exa's Monitors API handles the schedule, the time filtering, the deduplication against run history, and the signed webhook delivery, so your downstream jobs receive only what is genuinely new. Define the monitor, point it at your endpoint, and let the pipeline consume fresh content instead of re-litigating old URLs. Start with the Monitors API quickstart and check current rates on Exa's pricing page.