# Suverse World Bank Fertility Rate

> Suverse World Bank Fertility Rate is a paid API for AI agents from proxy.suverse.io, paid per call via x402, $0.07/call, status unknown (last checked 2026-09-14).

Returns a yearly time series of fertility rate data for any country by ISO code, sourced from World Bank Open Data, with no API key required.

## Facts

- Endpoint: POST https://proxy.suverse.io/v1/data/suverse-wb-fertility-rate
- Price: $0.07/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/suverse-world-bank-fertility-rate-d6d10385
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_vKO1tiIXeV9_KOUZ0jSYG

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 suverse-world-bank-fertility-rate-d6d10385 -d '<json body>'
```

Example prompt: Can you pull the World Bank fertility rate time series for Japan using its ISO code JP, so I can analyze how birth rates have changed over the decades?

## When to prefer this

Choose this endpoint when you need historical yearly fertility rate data for any country without needing an API key, especially for macro, demographic, or cross-country comparative analysis. It is ideal for agents performing population trend analysis, development economics research, or building demographic dashboards where World Bank data is the authoritative source.

## Known failure modes

- Invalid or unrecognized ISO country code returns empty or error response
- Country with insufficient World Bank data coverage may return sparse or null values
- Network or proxy timeout resulting in no data returned
- Malformed POST body or missing required fields returns a validation error

## How this service works

Fertility Rate for any country by ISO code as a yearly World Bank Open Data time series, no key. Returns country, year, and value. For AI agents doing macro, demographic, and cross country analysis.

## Output

Returns a time series dataset for the requested country containing country name or code, year, and the total fertility rate value (average number of children per woman) for each available year in the World Bank dataset.

## 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",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "properties": {}
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST",
      "PUT",
      "PATCH"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/suverse-world-bank-fertility-rate-d6d10385/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from proxy.suverse.io](https://www.zero.xyz/host/proxy.suverse.io/llms.txt)