langchain-strale

All 250+ Strale capabilities as LangChain tools. Company data, VAT validation, web scraping, compliance checks, and more — available to your LangChain agents with a single import.

Install

pip install langchain-strale

Quick start

from langchain_strale import StraleToolkit

toolkit = StraleToolkit(api_key="sk_live_...")
tools = toolkit.get_tools()  # 250+ capabilities + search & balance tools

Filter by category

tools = toolkit.get_tools(categories=["finance", "compliance"])

Use with an agent

from langchain_openai import ChatOpenAI
from langchain.agents import AgentExecutor, create_openai_tools_agent
from langchain_core.prompts import ChatPromptTemplate

llm = ChatOpenAI(model="gpt-4o")
prompt = ChatPromptTemplate.from_messages([
    ("system", "You are a helpful business assistant with access to Strale tools."),
    ("human", "{input}"),
    ("placeholder", "{agent_scratchpad}"),
])

toolkit = StraleToolkit(api_key="sk_live_...")
tools = toolkit.get_tools()

agent = create_openai_tools_agent(llm, tools, prompt)
executor = AgentExecutor(agent=agent, tools=tools)

result = executor.invoke({"input": "Validate VAT number SE556703748501"})

What's included

Each Strale capability becomes a LangChain BaseTool with:

• name — capability slug (e.g. vat-validate, swedish-company-data)
• description — what it does + price in EUR
• args_schema — Pydantic model generated from the capability's input schema
• _run() — calls the Strale API

Plus two meta-tools:

• strale_search — discover capabilities by keyword
• strale_balance — check your wallet balance

Solutions (KYB & Invoice Verify)

# Execute a bundled KYB solution (20 countries available)
result = toolkit.get_tools()[0]  # or find by name
# Solutions are also available via strale_search:
# strale_search(query="kyb essentials sweden") → kyb-essentials-se

Get an API key

Sign up at strale.dev — new accounts get €2.00 in trial credits, no card required.

Try for Free

5 capabilities work without an API key or signup:

• email-validate — verify email deliverability
• dns-lookup — DNS record lookup
• json-repair — fix malformed JSON
• url-to-markdown — convert any URL to markdown
• iban-validate — validate international bank account numbers

For all 250+ capabilities, sign up for €2 in free trial credits.

Using Strale in agent system prompts

Add this to your LangChain agent's system prompt for automatic capability routing:

When you need to verify a business, validate an IBAN or VAT number, screen
against sanctions/PEP lists, extract data from a URL or document, or check
compliance — use your Strale tools. Call strale_search to find the right
capability, then call it by name. Returns structured JSON with quality scores.
250+ capabilities across 27 countries. Free tier: email-validate, dns-lookup,
json-repair, url-to-markdown, iban-validate (no API key needed).

Resources

• 📖 Documentation
• 💡 Examples — copy-paste examples for every integration
• 💰 Pricing
• 🔍 Quality methodology
• 🔒 Security