langchain-apiverve

LangChain integration for APIVerve - Access 310+ utility APIs for AI agents and LLM applications.

Build powerful AI agents with access to validation, conversion, generation, analysis, and lookup APIs.

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Features

• 310+ APIs - Email validation, DNS lookup, IP geolocation, QR codes, currency conversion, and more
• 29 Categories - Data Lookup, News, Domain Data, Data Conversion, Entertainment, and more
• LangChain Native - Works with any LangChain agent or chain
• Type Safe - Full Pydantic schemas for inputs and outputs
• Async Support - Both sync and async API calls
• Flexible - Use individual tools or the "run any" meta-tool

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Installation

pip install langchain-apiverve

Quick Start

from langchain_apiverve import APIVerveToolkit
from langchain_openai import ChatOpenAI
from langchain.agents import create_tool_calling_agent, AgentExecutor
from langchain_core.prompts import ChatPromptTemplate

# Initialize toolkit with your API key
toolkit = APIVerveToolkit(api_key="your-api-key")
# Or set APIVERVE_API_KEY environment variable

# Get tools
tools = toolkit.get_tools()

# Create an agent
llm = ChatOpenAI(model="gpt-4")
prompt = ChatPromptTemplate.from_messages([
    ("system", "You are a helpful assistant with access to various utility APIs."),
    ("human", "{input}"),
    ("placeholder", "{agent_scratchpad}"),
])

agent = create_tool_calling_agent(llm, tools, prompt)
executor = AgentExecutor(agent=agent, tools=tools, verbose=True)

# Use the agent
result = executor.invoke({"input": "Is [email protected] a valid email?"})
print(result["output"])

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Usage Examples

Using Individual Tools

from langchain_apiverve import APIVerveToolkit

toolkit = APIVerveToolkit(api_key="your-api-key")

# Get specific tools
tools = toolkit.get_tools(include_apis=["emailvalidator", "dnslookup"])

# Use a tool directly
email_tool = tools[0]
result = email_tool.invoke({"email": "[email protected]"})
print(result)

Using the "Run Any" Tool

from langchain_apiverve import APIVerveToolkit

toolkit = APIVerveToolkit(api_key="your-api-key")

# Get the flexible run-any tool
run_any = toolkit.get_run_any_tool()

# Call any API dynamically
result = run_any.invoke({
    "api_id": "qrcodegenerator",
    "parameters": {"value": "https://example.com"}
})
print(result)

Filtering Tools by Category

from langchain_apiverve import APIVerveToolkit

toolkit = APIVerveToolkit(api_key="your-api-key")

# Get only validation tools
validation_tools = toolkit.get_tools(categories=["Validation"])

# Get only lookup tools
lookup_tools = toolkit.get_tools(categories=["Lookup"])

Low-Level Client Usage

from langchain_apiverve import APIVerveClient

client = APIVerveClient(api_key="your-api-key")

# Make API calls directly
result = client.call_api("emailvalidator", {"email": "[email protected]"})
print(result)

# Async usage
import asyncio

async def main():
    result = await client.acall_api("dnslookup", {"domain": "example.com"})
    print(result)

asyncio.run(main())

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Available APIs

APIVerve provides 310+ APIs across 29 categories:

Category	APIs	Examples
Data Lookup	15	World Time, Thesaurus, Emoji Lookup
News	1	World News
Domain Data	15	DNS Lookup, WHOIS Lookup, SSL Certificate Checker
Data Conversion	32	Unit Converter, Number to Words, Words to Numbers
Entertainment	24	Chuck Norris Jokes, Historical Events, Random Facts
Weather	8	Air Quality, Marine Weather, Weather
Science	4	Meteorite Landings, Stars Lookup, Periodic Table
Finance	13	Mortgage Calculator, Loan Calculator, Currency Symbols
Transportation	4	Airports Lookup, Airline Lookup, Car Models
Data Generation	32	Baby Name Generator, Random Word, Random User Generator

Browse all APIs →

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API Response Format

All APIVerve APIs return a consistent response format:

{
  "status": "ok",
  "error": null,
  "data": {
    // API-specific response data
  }
}

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Configuration

Environment Variables

Variable	Description
APIVERVE_API_KEY	Your APIVerve API key

Toolkit Options

toolkit = APIVerveToolkit(
    api_key="...",           # API key (or use env var)
    base_url="...",          # Custom API base URL
)

tools = toolkit.get_tools(
    categories=["..."],      # Filter by category
    include_apis=["..."],    # Only include specific APIs
    exclude_apis=["..."],    # Exclude specific APIs
    include_run_any=True,    # Include the "run any" tool
    include_popular=True,    # Include pre-built popular tools
)

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Development

Setup

# Clone the repository
git clone https://github.com/apiverve/langchain-apiverve.git
cd langchain-apiverve

# Install with Poetry
poetry install

# Or with pip
pip install -e ".[dev]"

Running Tests

pytest

Linting

ruff check .
mypy src/

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Resources

Resource	Link
APIVerve Website	apiverve.com
API Documentation	docs.apiverve.com
API Marketplace	apiverve.com/marketplace
LangChain Docs	python.langchain.com
GitHub Issues	github.com/apiverve/langchain-apiverve/issues

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License

MIT License - see LICENSE for details.

Copyright (c) 2025 APIVerve