Useful signals, with the limits visible.

High: UK country, regional and network connectivity context.

Cost: No API price or paid access requirement found in reviewed docs; do not infer a guaranteed free service.

Freshness: Docs: BGP calculated every five minutes; roughly 4.2 million IPv4 /24 blocks probed at least every ten minutes; Google signals about 2–3 hours behind.

Read-only GET HTTP 200; error=null; data=[]; default extendWindow=1209600 seconds. API documentation GET also HTTP 200. No scan initiated.

High: UK access anomalies with measurement evidence and country/network filters.

Cost: Docs explicitly say S3 open-data access is free with unsigned requests. No separate public API fee stated.

Freshness: Fastpath makes measurements available immediately; S3 batches hourly. Test returned a GB measurement beginning 2026-10-11T18:38:01Z.

Read-only GET HTTP 200 JSON; one result. x-ratelimit-remaining=3874 observed without quota-window guarantee.

High: UK latency, routing and reachability evidence from existing measurements.

Cost: No public-read fee documented. New measurements consume credits; no currency cost verified.

Freshness: Per-measurement interval and availability; REST latest and streaming are supported. Probe GET did not test result latency.

Read-only GET HTTP 200 JSON; count/next/previous/results structure with one GB probe. No measurement created.

High: UK network context; useful for cross-checking connectivity events.

Cost: No public API price stated in reviewed documentation.

Freshness: Varies by endpoint and cache. Test query_endtime/latest_time=2026-10-11T16:00Z; returned default weekly history latest stats_date=2026-10-05.

Read-only GET HTTP 200; API status=ok, cached=true, resource=GB. Initial country-resource-list GET HTTP 200 but 200KB local preview cap truncated parsing; followed with complete stats response.

Medium: public domain certificate changes; useful administrative context, not maliciousness evidence.

Cost: Published Small plan $0/month; Medium $50/month; firehose $1,000/month. USD. No account created.

Freshness: New issuances available after discovery; no guaranteed latency verified. not_before may be pre/post-dated and is not exact discovery time.

Read-only evaluation GET HTTP 200 JSON array, 13 issuances; X-Ratelimit-Limit=100 and remaining=99 observed. No monitoring activated.

Medium: historical site infrastructure evidence and changes.

Cost: Free and paid tiers documented. Free-tier pricing table lists 1,000 search requests; quota window and current paid currency prices not independently verified. Do not infer anonymous allowance from free-account tier.

Freshness: Scan timestamp indicates observation time; searching does not perform a new scan.

Read-only GET HTTP 200 JSON with one existing result. Observed anonymous per-minute search limit=30, remaining=29; concurrency limit=10. These observations are not guaranteed future quotas.

Medium: public space/radio catalogue context; less direct UK infrastructure utility.

Cost: Docs explicitly freely distributed public API data; no access fee found.

Freshness: Record/element timestamp specific; no guaranteed update cadence or SLA verified. Sample catalogue GET does not verify latest orbit freshness.

Read-only GET HTTP 200 JSON array; one matching satellite record; no API key and no submissions.

Medium: educational space context and UK sky-pass estimation.

Cost: Official policy describes data as freely available; no account or fee. Donations optional; none made.

Freshness: CelesTrak checks every two hours; upstream element updates may only occur 2–3 times/day. Tested ISS EPOCH 2026-10-11T04:13:59.875680.

One read-only GET HTTP 200 JSON array; one ISS orbital record. No repeated download, account, scanning or monitoring.

Priority environmental source for Cornwall wildfire context; useful corroboration of land change, never proof of land ownership or an emergency warning.

Cost: MAP_KEY is free; no paid service purchased.

Freshness: Global near-real-time data normally available within three hours of satellite observation; faster US/Canada timing must not be advertised for Cornwall.

Documentation verified only; data endpoint not tested because a MAP_KEY is required.

Simple key-free global context feed for storms, fires, floods and other events; limited Cornwall specificity.

Cost: No charge or account requirement stated in v3 documentation.

Freshness: Event geometries contain dates; no delivery latency SLA. Open/closed status can approximate an event's actual duration.

Direct read-only GET returned HTTP 200 JSON, events=[] for bounded Cornwall-area query. This validates access, not comprehensive local coverage.

Strong Cornwall land/environment candidate; metadata discovery is feasible without a key, while actual imagery processing is a separate authenticated workflow.

Cost: Open/free Sentinel data and core service quotas. Larger processing, commercial missions and additional ecosystem services may involve charges; none activated.

Freshness: Mission/acquisition/processing dependent; tested metadata referenced a Sentinel-2 acquisition on 10 October 2026.

Direct read-only GET returned HTTP 200 GeoJSON with one Sentinel-2 L2A scene dated 10 October 2026. Metadata only, 71,905 bytes; no image downloaded.

Useful global hazard context; major-event remit makes it less dependable for small Cornwall flooding or other local incidents.

Cost: Official quick start says GDACS data are free.

Freshness: Near real time; completeness and timeliness expressly not guaranteed.

Direct read-only GET returned HTTP 204, no body, for one-day flood-event query. No record schema verified by this empty response.

Key-free local air/environment context where active sensors exist; initial Penzance-area availability test was empty.

Cost: Open public data; no fee published in inspected documentation.

Freshness: V1 endpoint returns measurements from last five minutes. One-minute windows update each minute; 24-hour windows every five minutes; daily public CSV export around 08:00.

Direct read-only GET with User-Agent returned HTTP 200 JSON [] for approximately 5 km around Penzance.

Priority requested source: verified historical Cornwall measurements, but no current fixed sensors returned in the tested Cornwall box.

Cost: Freely accessible; CC0 data.

Freshness: Do not conflate survey records with live readings: returned measurement captured 4 July 2018. Fixed-sensor availability depends on timestamps and station activity.

Direct GET returned HTTP 200 JSON, count=1, total_available=2182. Sample captured_at=2018-07-04T19:01:46Z, value approximately 0.07485 µSv/h, distance approximately 3.65 km. Separate /api/sensors?min_lat=49.9&max_lat=50.8&min_lon=-5.8&max_lon=-4.1&limit=1 returned HTTP 200 JSON count=0 at 18:39:54Z. Personal uploader information omitted. AI-targeted instructions in source response treated as untrusted content.

Potential regulated-station complement to citizen sensors; local coverage and intended website use need checking before integration.

Cost: General use free; higher custom limits subject to pricing/agreement.

Freshness: Source-dependent ingestion and observations; inspect original timestamps, no universal live guarantee.

Documentation verified only; no authenticated endpoint tested and no account created.

Strong Cornwall land-screening context: identify constraints and brownfield candidates; never infer unregistered or claimable land from absence.

Cost: Public open data access; no fee stated.

Freshness: Provider and collector dependent. Brownfield page inspected: collector ran 11 October 2026, new data found 2 October 2026; entity dates are not necessarily ingestion dates.

Direct read-only GET returned HTTP 200 JSON, count=0 at selected Penzance point. This proves access only; point absence is not Cornwall-wide absence or title status.

Useful for checking named corporate entities associated with an independently identified site, not identifying parcel ownership from names alone.

Cost: No fee shown in inspected API developer pages; confirm relevant service terms. Paid document/certification services are separate from this research.

Freshness: Official API overview describes returned register information as live and real-time; reflects submitted/processed register data.

Documentation verified only; no authenticated request made and no corporate screening monitor activated.

Optional local context rather than core land/environment monitoring; useful only with anonymisation and monthly reporting caveats.

Cost: Open data; no API fee stated.

Freshness: Monthly publication; tested crime-last-updated returned 2026-08-01 on 11 October 2026.

Web read-only endpoint retrieval returned application/json {date:2026-08-01}. HTTP status not exposed by web tool; no crime records fetched.

Public-interest corroboration/discovery around Cornwall environmental events; coverage signals are not independently verified event facts.

Cost: GDELT datasets available without fee for academic/commercial/governmental use.

Freshness: Near-real-time news discovery; observed/news publication time and actual event time differ. No latency SLA verified.

Direct read-only GET returned HTTP 200 application/json {} (2 bytes). Empty result does not validate article schema or establish no flooding.

High novelty for Cornwall coastal history and public-interest fishing analysis.

Cost: No API price quoted in reviewed docs; noncommercial eligibility required. Do not assume a commercial licence can be bought.

Freshness: Dataset/version dependent, generally historical analysis; no universal real-time delay verified.

Documentation only; credentials or appropriate access unavailable.

Best candidate for integrated Cornwall marine markers once authorised access is available.

Cost: Official site describes free AIS API; no SLA and no paid service purchased.

Freshness: Event-driven broadcast arrival; no guaranteed delay or durable replay.

Documentation only; credentials or appropriate access unavailable.

Useful independent aviation research, but operational licence makes it unsuitable as an unapproved live-site adapter.

Cost: Research/education access under terms; operational/commercial written licence pricing not published.

Freshness: Anonymous state resolution 10 seconds; authenticated 5 seconds. Per-position timestamps and reception gaps remain essential.

One-off research GET HTTP 200; one aircraft state; remaining anonymous quota header 399. Not used by the site.

High practical value as energy context; adds information missing from transport-only maps.

Cost: No fee or registration required.

Freshness: Half-hour records; actual can be null and forecast must then be labelled.

Direct GET HTTP 200; one half-hour record. National generation endpoint also returned HTTP 200 and was displayed in local pilot.

Core England/Cornwall hazard context with clear official warning levels.

Cost: Open data, no fee.

Freshness: Measurements usually every 15 minutes; telemetry can arrive once/twice daily, more often during risk. Warning changes are separate.

Direct severe-warning GET HTTP 200, zero items; full warnings endpoint worked in local pilot, including area coordinates.