SYNTHORA usgs_volcano_alerts — agent-tools.cloud

Returns all US volcanoes currently at elevated alert level with observatory, volcano name, color code and alert notice from the USGS HANS public API, keyless. Autonomous aviation, disaster-response, insurance and travel agents consume it for A2A volcanic-hazard monitoring and agent-to-agent risk alerting. Ranking surface: volcano alert API, USGS HANS, volcanic activity, aviation color code, eru...

Paid verification

How it works

No sponsored paid call yet.

Pay this endpoint once from your own wallet (Base USDC, up to $1.00) and we call it and record what came back. Your wallet pays the listed recipient directly; Agent Tools never holds funds. Sponsored checks prove delivery; they do not count as demand.

Quality grade

How grading works

B 57.9 / 100

Availability 20.0 / 20

Endpoint responded (HTTP 402)

Payability 15.0 / 15

✓ Answers a real HTTP 402 challenge
✓ Publishes a /.well-known/x402 descriptor
✓ Payment address on record
✓ Settlement network declared
✓ Price declared

Demand 2.0 / 35

44 distinct payers, 207 USDC transfers in the last 30 days; the wallet is shared by 150 listings, so each is credited 1/150

Performance 8.4 / 10

Last probe answered in 494 ms (full marks at 200 ms or less)

Readiness 12.6 / 15

Agent readiness 84/100

Owner verified 0.0 / 5

Nobody has claimed this listing yet

Endpoint last checked 21 h ago. On-chain activity last read 4 d ago. Availability and on-chain demand are both re-probed daily; the grade updates automatically on the next pass. This grade sets search order and leaderboards; the readiness score below is shown for reference only.

x402 readiness

B · 84/100

Readiness is how fully this listing follows its protocol and how it behaved in our probes over 30 days. For x402 and A2A listings it contributes up to 15 of the 100 quality points; for MCP listings it is shown for reference only. Search order and leaderboards use the separate quality grade (here B, 57.9/100), which weighs availability, payability and on-chain demand. How the two differ

Valid payment requirements	10/10	Payment requirements carry a payee, a mainnet network and a price.
Live 402 challenge	25/25	Paid endpoint answers with an HTTP 402 challenge (494 ms).
x402 version	10/10	Speaks x402 v2.
Signed descriptor	n/a	No x402 standard defines a signed descriptor.
Uptime (30 days)	11.61/15	24/31 probes succeeded over 30 days (77%).
Resource declaration	5/10	Declares 1 paid resource(s).
Verified identity	5/10	Publisher descriptor (/.well-known/x402 or OpenAPI) on record; claim this listing to verify domain control.
Freshness + modern flags	5/5	seen in a source within 7 days; declares x402.
Security declaration	n/a	Payment is the access control for an x402 resource.

Applicable criteria total 85 points, scaled to 100.

Responsiveness: Responsive (494 ms; bands ≤2.5 s, ≤5 s, ≤8 s, slower; penalty only).

Payment evidence: x402_challenge — We sent a request and got a live HTTP 402 challenge. Also: x402_manifest, catalog_listing. Qualifies the payment claim; adds no points.

Measured 2026-11-12.

Nine criteria, the same as the A2A readiness score, read from our daily probe of the paid endpoint, its payment requirements and 30-day probe history. Signed descriptor and security declaration are n/a for x402 (payment is the access control), as is an x402 version we have not observed; the remaining points are scaled to 100. Grades: A>=90, B>=75, C>=60, D>=40, F<40. It also feeds 15 points of the x402 quality grade.

What we measured

Over the last 30 days we probed this API 31 times on 29 days; it answered 24 (77%). Median response 479 ms, 95th percentile 815 ms.

On-chain, 44 distinct wallets paid its payment address 207 times in the last 30 days.

Among the 10,130 reachable x402 APIs in our snapshot of 2026-11-13 01:12 UTC, it is faster than 20% and higher on readiness than 65%.

From agent-tools.cloud's own probes, last checked 2026-11-12. How we measure

Compared with peers

Against 10,130 reachable x402 APIs in our daily snapshot (2026-11-13 01:12 UTC). Display only; it does not change search order.

Readiness: Higher than 65% of peers; This listing 84 · peer median 77
Latency: Faster than 20% of peers; This listing 494 ms · peer median 222 ms

Where it loses the most points, and how to win them back

Resource declaration −5 — Declare each paid resource with its input and output schema.
Now: Declares 1 paid resource(s).
Verified identity −5 — Claim the listing and prove control of its domain.
Now: Publisher descriptor (/.well-known/x402 or OpenAPI) on record; claim this listing to verify domain control.
Uptime (30 days) −3.4 — Stay reachable in our daily probes.
Now: 24/31 probes succeeded over 30 days (77%).

How many agent tools actually work · All statistics

How to call

cURL · x402-fetch / x402-axios will auto-handle 402

curl -sS -i -X GET https://usgs-volcano-alerts.hergertsynthora.com/service  # expect HTTP 402 Payment Required (about $0.001/call)

/.well-known/x402.json

https://usgs-volcano-alerts.hergertsynthora.com/.well-known/x402

Listed in

Directories this entry was found in.

x402scan since 2026-09-13