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This example shows how to build Upsonic LLM agents that can:
  1. Find the official website of a company using the Serper API
  2. Validate whether a given website belongs to that company

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Overview

The Find Company Website example demonstrates how to use Upsonic agents with external APIs to perform intelligent web research. It consists of two main components:
  • Website Finder: Searches for and validates company websites
  • Website Validator: Verifies if a given URL belongs to a specific company
Both agents use the Serper API for web search and HTML parsing for validation, showcasing how Upsonic can integrate with external services for real-world applications.

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Key Features

  • Intelligent Search: Uses Serper API to find company websites
  • Smart Validation: Analyzes website content to verify authenticity
  • Structured Output: Returns validated results with confidence scores
  • Error Handling: Graceful handling of API failures and invalid URLs
  • Domain Filtering: Excludes irrelevant domains (social media, directories)

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Code Structure

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Response Models

class WebsiteResponse(BaseModel):
    company: str
    website: Optional[HttpUrl] = None
    validated: bool = False
    score: float = 0.0
    reason: Optional[str] = None

class ValidationResult(BaseModel):
    company: str
    website: Optional[HttpUrl] = None
    validated: bool = False
    score: float = 0.0
    reason: Optional[str] = None

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Serper API Client

def search_company(query: str) -> dict:
    """Search for the company using Serper API."""
    if not SERPER_API_KEY:
        raise ValueError("Missing SERPER_API_KEY in .env")
    headers = {"X-API-KEY": SERPER_API_KEY, "Content-Type": "application/json"}
    resp = requests.post(SERPER_URL, headers=headers, json={"q": query})
    resp.raise_for_status()
    return resp.json()

def find_company_candidates(company_name: str, top_k: int = 5) -> list[str]:
    """Return top candidate links, skipping known irrelevant domains."""
    results = search_company(company_name)
    raw_links = [r["link"] for r in results.get("organic", []) if "link" in r]

    candidates = []
    for url in raw_links:
        if any(bad in url for bad in BAD_DOMAINS):
            continue
        candidates.append(url)
        if len(candidates) >= top_k:
            break

    return candidates

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HTML Utilities

def fetch(url: str, timeout: int = 10) -> str:
    """Fetch HTML text for a given URL."""
    resp = requests.get(url, headers=DEFAULT_HEADERS, timeout=timeout)
    resp.raise_for_status()
    return resp.text

def extract_text_signals(html: str) -> dict:
    """Extract simple signals: title and h1 tags."""
    soup = BeautifulSoup(html, "lxml")
    title = soup.title.string.strip() if soup.title else ""
    h1s = [h.get_text(" ", strip=True) for h in soup.find_all("h1")]
    return {"title": title, "h1": h1s}

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Complete Implementation

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find_company_website.py

# task_examples/find_company_website/find_company_website.py

import sys
import os
import argparse

# Add the project root to the path for absolute imports
sys.path.append(os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__)))))

from upsonic import Agent, Task
from pydantic import BaseModel, HttpUrl
from typing import Optional

try:
    from serper_client import find_company_candidates
except ImportError:
    from task_examples.find_company_website.serper_client import find_company_candidates
from task_examples.find_company_website.validate_company_website import validate_candidate, ValidationResult


class WebsiteResponse(BaseModel):
    company: str
    website: Optional[HttpUrl] = None
    validated: bool = False
    score: float = 0.0
    reason: Optional[str] = None


def find_company_website(company: str) -> WebsiteResponse:
    """
    Find the official website for a company using Serper search + validation.
    - Validate all candidates and return the one with the highest score.
    """
    try:
        candidates = find_company_candidates(company, top_k=5)

        best_result: Optional[ValidationResult] = None
        for url in candidates:
            result: ValidationResult = validate_candidate(company, url)
            if not best_result or result.score > best_result.score:
                best_result = result

        if best_result:
            return WebsiteResponse(
                company=company,
                website=best_result.website,
                validated=best_result.validated,
                score=best_result.score,
                reason=best_result.reason,
            )

        return WebsiteResponse(company=company, website=None, validated=False, reason="No valid site found")

    except Exception as e:
        return WebsiteResponse(company=company, website=None, validated=False, reason=str(e))


def find_tool(company: str) -> WebsiteResponse:
    """Tool: Find the official website for a company using Serper + validation."""
    return find_company_website(company)


agent = Agent(name="website_finder")

if __name__ == "__main__":
    parser = argparse.ArgumentParser(description="Find a company's official website.")
    parser.add_argument("--company", required=True, help="Company name, e.g. 'Amazon Inc'")
    args = parser.parse_args()

    task = Task(
        description=f"Find the official website of {args.company}",
        tools=[find_tool],
        response_format=WebsiteResponse,
    )

    result = agent.do(task)
    print(result.model_dump_json(indent=2))

​
serper_client.py

# task_examples/find_company_website/serper_client.py

import os
import requests
from dotenv import load_dotenv

load_dotenv()

SERPER_API_KEY = os.getenv("SERPER_API_KEY")
SERPER_URL = "https://google.serper.dev/search"

# Common junk domains we don't want to consider as "official websites"
BAD_DOMAINS = [
    "wikipedia.org",
    "linkedin.com",
    "crunchbase.com",
    "facebook.com",
    "twitter.com",
    "x.com",
    "youtube.com",
    "instagram.com",
    "glassdoor.com",
    "indeed.com",
]


def search_company(query: str) -> dict:
    """Search for the company using Serper API."""
    if not SERPER_API_KEY:
        raise ValueError("Missing SERPER_API_KEY in .env")
    headers = {"X-API-KEY": SERPER_API_KEY, "Content-Type": "application/json"}
    resp = requests.post(SERPER_URL, headers=headers, json={"q": query})
    resp.raise_for_status()
    return resp.json()


def find_company_candidates(company_name: str, top_k: int = 5) -> list[str]:
    """Return top candidate links, skipping known irrelevant domains."""
    results = search_company(company_name)
    raw_links = [r["link"] for r in results.get("organic", []) if "link" in r]

    candidates = []
    for url in raw_links:
        if any(bad in url for bad in BAD_DOMAINS):
            continue
        candidates.append(url)
        if len(candidates) >= top_k:
            break

    return candidates

​
html_utils.py

# task_examples/find_company_website/html_utils.py

import requests
from bs4 import BeautifulSoup


DEFAULT_HEADERS = {
    "User-Agent": "Mozilla/5.0 (compatible; UpsonicExamples/1.0)",
    "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
}

def fetch(url: str, timeout: int = 10) -> str:
    """Fetch HTML text for a given URL."""
    resp = requests.get(url, headers=DEFAULT_HEADERS, timeout=timeout)
    resp.raise_for_status()
    return resp.text


def extract_text_signals(html: str) -> dict:
    """Extract simple signals: title and h1 tags."""
    soup = BeautifulSoup(html, "lxml")
    title = soup.title.string.strip() if soup.title else ""
    h1s = [h.get_text(" ", strip=True) for h in soup.find_all("h1")]
    return {"title": title, "h1": h1s}

​
validate_company_website.py

# task_examples/find_company_website/validate_company_website.py

import argparse
from upsonic import Agent, Task
from pydantic import BaseModel, HttpUrl
from typing import Optional
from urllib.parse import urlparse

try:
    from html_utils import fetch, extract_text_signals
except ImportError:
    from task_examples.find_company_website.html_utils import fetch, extract_text_signals
from bs4 import BeautifulSoup


class ValidationResult(BaseModel):
    company: str
    website: Optional[HttpUrl] = None
    validated: bool = False
    score: float = 0.0
    reason: Optional[str] = None


def validate_candidate(company: str, url: str) -> ValidationResult:
    """
    Validate whether the given URL belongs to the specified company.
    - Strongly prefer domains that contain the brand token.
    - Accept matches in title, h1, or footer text.
    """
    try:
        html = fetch(url, timeout=10)
        signals = extract_text_signals(html)

        company_upper = company.upper()
        brand = company_upper.split()[0] 
        title = signals.get("title", "").upper()
        h1s = " ".join(signals.get("h1", [])).upper()

        # Footer text
        soup = BeautifulSoup(html, "lxml")
        footer = soup.find("footer")
        footer_text = footer.get_text(" ", strip=True).upper() if footer else ""

        domain = urlparse(url).netloc.lower()

        # Strong signal: brand in domain
        if brand.lower() in domain:
            return ValidationResult(company=company, website=url, validated=True, score=0.9, reason="Brand in domain")

        # Full company name in title, h1, or footer
        if company_upper in title or company_upper in h1s or company_upper in footer_text:
            return ValidationResult(company=company, website=url, validated=True, score=0.8, reason="Full name match in title/h1/footer")

        # Brand token in title, h1, or footer
        if brand in title or brand in h1s or brand in footer_text:
            return ValidationResult(company=company, website=url, validated=True, score=0.6, reason="Brand match in title/h1/footer")

        return ValidationResult(company=company, website=url, validated=False, score=0.0, reason="No match in title/h1/footer")
    except Exception as e:
        return ValidationResult(company=company, website=url, validated=False, score=0.0, reason=str(e))


def validate_tool(company: str, url: str) -> ValidationResult:
    """Tool: Validate if the given URL is the official website of the company."""
    return validate_candidate(company, url)


agent = Agent(name="website_validator")

if __name__ == "__main__":
    parser = argparse.ArgumentParser(description="Validate a company website.")
    parser.add_argument("--company", required=True, help="Company name, e.g. 'Amazon Inc'")
    parser.add_argument("--url", required=True, help="Website URL, e.g. 'https://www.amazon.com/'")
    args = parser.parse_args()

    task = Task(
        description=f"Validate if {args.url} belongs to {args.company}",
        tools=[validate_tool],
        response_format=ValidationResult,
    )

    result = agent.do(task)
    print(result.model_dump_json(indent=2))

​
How It Works

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1. Website Discovery Process

  1. Search: Uses Serper API to search for the company name
  2. Filter: Removes irrelevant domains (social media, directories)
  3. Validate: Analyzes each candidate website’s content
  4. Score: Assigns confidence scores based on brand matches
  5. Return: Returns the highest-scoring validated website

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2. Validation Logic

The validation process checks for:
  • Brand in Domain: Highest score (0.9) when company brand appears in URL
  • Full Name Match: High score (0.8) when full company name appears in title/h1/footer
  • Brand Match: Medium score (0.6) when brand token appears in content
  • No Match: Score 0.0 when no relevant content is found

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3. Content Analysis

The system analyzes:
  • Page Title: Company name in HTML title tag
  • H1 Headers: Main headings on the page
  • Footer Text: Company information in footer
  • Domain Name: Brand presence in URL structure

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Usage

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Setup

  1. Install dependencies:
uv sync
  1. Copy .env.example to .env and add your Serper API key:
cp .env.example .env
  1. Edit .env and replace the placeholder with your real key:
SERPER_API_KEY=your_api_key_here
You can get a free API key at https://serper.dev.

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Find a Company Website

uv run python task_examples/find_company_website/find_company_website.py --company "Amazon Inc"
Example output: 
{
  "company": "Amazon Inc",
  "website": "https://www.amazon.com/",
  "validated": true,
  "score": 0.9,
  "reason": "Brand in domain"
}

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Validate a Company Website

uv run python task_examples/find_company_website/validate_company_website.py --company "Amazon Inc" --url "https://www.amazon.com/"
Example output: 
{
  "company": "Amazon Inc",
  "website": "https://www.amazon.com/",
  "validated": true,
  "score": 0.9,
  "reason": "Brand in domain"
}

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Use Cases

  • Business Research: Find official websites for companies
  • Due Diligence: Verify company website authenticity
  • Competitive Analysis: Identify competitor websites
  • Lead Generation: Validate business contact information
  • Brand Monitoring: Track official company web presence

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File Structure

task_examples/find_company_website/
├── find_company_website.py      # Agent: find websites
├── validate_company_website.py  # Agent: validate websites
├── serper_client.py             # Serper API client
├── html_utils.py                # HTML fetch + signals
└── README.md                    # Documentation

# Root directory
.env.example                     # Example env file for API keys (in root)

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Notes

  • Finder: takes a company name, searches with Serper, validates candidates, and returns the best match
  • Validator: checks if a given URL belongs to a company
  • Both use Upsonic agents with external API integration
  • Domain Filtering: Automatically excludes social media and directory sites
  • Confidence Scoring: Provides reliability metrics for validation results

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Repository

View the complete example: Find Company Website Example
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