# Elements Live – Chemical Element Research Intensity History

> Elements Live – Chemical Element Research Intensity History is a paid API for AI agents from www.elements-live.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-12).

Returns a yearly time-series of RIS and HRI research-intensity scores for a single chemical element, identified by its symbol.

## Facts

- Endpoint: GET https://www.elements-live.com/v1/elements/:symbol/history?utm_source=zero.xyz
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/elements-live-chemical-element-research-intensity-history-95051a90
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_vxs16fXlxjyc_Pnw7XtKn

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 elements-live-chemical-element-research-intensity-history-95051a90
```

Example prompt: Can you pull up the yearly research intensity history for iron (Fe) from Elements Live — I want to see how the RIS and HRI scores have changed over the years?

## When to prefer this

Use this endpoint when you need the historical year-by-year research intensity trend for a specific chemical element (by symbol), and you want RIS/HRI metrics rather than raw paper counts. Prefer this over the topic-based history endpoint when your query is explicitly about a periodic-table element rather than a broader research topic or compound.

## Known failure modes

- Invalid or unrecognized element symbol returns an error or empty result
- Element symbol provided in wrong case or format (e.g. full name instead of symbol) may fail
- Payment failure or insufficient USDC balance blocks the request under x402 protocol
- Rate limiting or quota exhaustion returns a 429 or payment-required error
- Network timeout if the data source is temporarily unavailable

## How this service works

Yearly RIS/HRI research-intensity history for one chemical element.

## Output

A time-series array of yearly data points for the specified chemical element, each containing the year, RIS (Research Intensity Score), and HRI (Hyper Research Intensity) values, allowing trend analysis of how scientific research activity around that element has changed over time.

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object",
     "required": [
      "symbol"
     ],
     "properties": {
      "symbol": {
       "type": "string",
       "description": "Element symbol, e.g. Fe"
      }
     }
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "entity",
      "resolution",
      "labels",
      "metrics",
      "notes",
      "canonical_url"
     ],
     "properties": {
      "notes": {
       "type": "object"
      },
      "entity": {
       "type": "object",
       "required": [
        "type",
        "id",
        "name"
       ],
       "properties": {
        "id": {
         "type": "string"
        },
        "name": {
         "type": "string"
        },
        "type": {
         "type": "string"
        }
       }
      },
      "labels": {
       "type": "array",
       "items": {
        "type": "string"
       }
      },
      "metrics": {
       "type": "object",
       "required": [
        "ris",
        "hri"
       ],
       "properties": {
        "hri": {
         "type": "array"
        },
        "ris": {
         "type": "array"
        }
       }
      },
      "resolution": {
       "type": "string"
      },
      "canonical_url": {
       "type": "string"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/elements-live-chemical-element-research-intensity-history-95051a90/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from www.elements-live.com](https://www.zero.xyz/host/www.elements-live.com/llms.txt)