Add exchangerateapi skill using ExchangeRate-API

skills/exchangerateapi/__init__.py

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+# skills/currency_conversion/__init__.py
+from .exchange_rate_api import ExchangeRateAPISkill
+
+def get_skills(config):
+    return [
+        ExchangeRateAPISkill(api_key=config["api_key"])
+    ]

skills/exchangerateapi/base.py

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+# skills/currency_conversion/base.py
+from intentkit.skills.base_skill import BaseSkill
+
+class CurrencyConversionSkill(BaseSkill):
+    def convert(self, amount: float, from_currency: str, to_currency: str) -> float:
+        raise NotImplementedError("This method must be implemented by subclasses.")

skills/exchangerateapi/exchange_rate_api.py

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+# skills/currency_conversion/exchange_rate_api.py
+import requests
+from .base import CurrencyConversionSkill
+
+class ExchangeRateAPISkill(CurrencyConversionSkill):
+    def __init__(self, api_key: str):
+        self.api_key = api_key
+
+    def convert(self, amount: float, from_currency: str, to_currency: str) -> float:
+        url = f"https://v6.exchangerate-api.com/v6/{self.api_key}/pair/{from_currency}/{to_currency}"
+        response = requests.get(url)
+        data = response.json()
+
+        if response.status_code != 200 or 'conversion_rate' not in data:
+            raise ValueError("Failed to retrieve conversion rate.")
+
+        rate = data['conversion_rate']
+        return amount * rate

skills/exchangerateapi/schema.json

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+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "type": "object",
+  "title": "Currency Conversion Skills",
+  "description": "Convert between any two currencies (e.g., USD to EUR, BTC to NGN) using the ExchangeRate-API.",
+  "x-icon": "https://ai.service.crestal.dev/skills/exchangerateapi/exchangerateapi.png",
+  "x-api-key": "required",
+  "properties": {
+    "enabled": {
+      "type": "boolean",
+      "title": "Enabled",
+      "description": "Whether this skill category is enabled",
+      "default": false
+    },
+    "states": {
+      "type": "object",
+      "properties": {
+        "convert_currency": {
+          "type": "string",
+          "enum": ["disabled", "public", "private"],
+          "x-enum-title": [
+            "Disabled",
+            "Agent Owner + All Users",
+            "Agent Owner Only"
+          ],
+          "description": "Convert one currency to another using real-time exchange rates.",
+          "default": "disabled"
+        }
+      },
+      "description": "Skill states: enable or restrict access to individual conversion tasks."
+    }
+  },
+  "required": ["states", "enabled"]
+}