# Earthquake Intelligence – Significant Events

> Earthquake Intelligence – Significant Events is a paid API for AI agents from earthquakes.use.x402atlas.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-16).

Search USGS seismic events filtered by a significance-score threshold, returning magnitude, provenance, and event metadata for the most notable earthquakes in a rolling time window.

## Facts

- Endpoint: GET https://earthquakes.use.x402atlas.com/significant
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/earthquake-intelligence-significant-events-ba014938
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Gv0i9XmgdL9IeE-qpEXZQ

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability earthquake-intelligence-significant-events-ba014938
```

Example prompt: Show me the most significant earthquakes from the past 30 days — only events with a USGS significance score above 800, and return up to 100 events.

## When to prefer this

Choose this endpoint when you need to surface only the most notable or impactful seismic events by USGS significance score, rather than all earthquakes above a raw magnitude threshold. It is ideal for briefings, research, or monitoring scenarios where event importance (combining magnitude, felt reports, and media attention) matters more than magnitude alone. Use the sibling 'Recent earthquakes' endpoint if you want newest-first results filtered purely by magnitude without a significance score filter.

## Known failure modes

- No events returned if significance threshold is set too high for the time window selected
- Stale flag set to true when a cached snapshot is served instead of a live query
- Query parameter validation errors if days exceeds 365 or min_significance exceeds 2000
- Empty event list for very short time windows with high significance thresholds
- Service unavailable if upstream USGS feed is unreachable

## How this service works

Significant earthquakes — search USGS seismic events above an explicit significance-score threshold, with magnitude and provenance but no danger or probability claim.

## Output

Returns a JSON object containing: the count of matched events, the effective query identity (window start/end, days, significance threshold, limit), a list of normalized seismic events with magnitude and provenance, a staleness flag indicating whether a cached snapshot was served, any warnings, the data source, and the retrieval timestamp.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "days": {
       "type": "integer",
       "default": 30,
       "maximum": 365,
       "minimum": 1,
       "description": "Rolling UTC window in days"
      },
      "limit": {
       "type": "integer",
       "default": 50,
       "maximum": 200,
       "minimum": 1,
       "description": "Maximum normalized events returned"
      },
      "min_significance": {
       "type": "integer",
       "default": 600,
       "maximum": 2000,
       "minimum": 0,
       "description": "Minimum USGS significance score; not a probability or danger rating"
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "operation",
      "schema_version",
      "query",
      "count",
      "events",
      "source",
      "retrieved_at",
      "stale",
      "warnings"
     ],
     "properties": {
      "count": {
       "type": "integer",
       "maximum": 200,
       "minimum": 0,
       "description": "Number of normalized events returned"
      },
      "query": {
       "type": "object",
       "required": [
        "window_start",
        "window_end",
        "days",
        "min_significance",
        "limit"
       ],
       "properties": {
        "days": {
         "type": "integer",
         "maximum": 365,
         "minimum": 1,
         "description": "Applied rolling days"
        },
        "limit": {
         "type": "integer",
         "maximum": 200,
         "minimum": 1,
         "description": "Applied event limit"
        },
        "window_end": {
         "type": "string",
         "format": "date-time",
         "description": "Inclusive UTC end bucket used for source query and cache identity"
        },
        "window_start": {
         "type": "string",
         "format": "date-time",
         "description": "Inclusive UTC start of the effective bucketed window"
        },

… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/earthquake-intelligence-significant-events-ba014938/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from earthquakes.use.x402atlas.com](https://www.zero.xyz/host/earthquakes.use.x402atlas.com/llms.txt)