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Overview

Understanding the sources covered by News API v3 is crucial for ensuring the comprehensiveness and reliability of your news data analysis. This guide will walk you through the process of checking source coverage using the /source endpoint, including how to handle large numbers of sources efficiently.

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Before you start

Before you begin, ensure you have:
  • An active API key for NewsCatcher News API v3
  • Basic knowledge of making API requests
  • Python or another tool for making HTTP requests (e.g., cURL, Postman, or a programming language with HTTP capabilities)

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Steps

1

Understand key parameters

To make a valid request to the /sources endpoint, use at least one of the following key parameters:
  • lang: The language(s) of the sources.
  • countries: The countries where the news publishers are located.
  • predefined_sources: Predefined top sources per country.
  • source_name: Text to search within source names. You can specify any word, term, phrase, or outlet name.
  • source_url: The domain(s) of the news publication to search for. When specifying this parameter, you can only use include_additional_info as an extra parameter.
To refine your search and obtain addional source info, you can use:
  • include_additional_info: Set to true to get extra details about each source.
  • from_rank and to_rank: Filter sources by their SEO rank.
For detailed descriptions and usage of all parameters, refer to the Sources reference documentation.
2

Construct a query and make an API request

Here’s a Python example demonstrating how to check for sources containing a specific word:
Python
import requests
import json

API_KEY = "YOUR_API_KEY_HERE"
URL = "https://v3-api.newscatcherapi.com/api/sources"
HEADERS = {"x-api-token": API_KEY}

PAYLOAD = {
    "source_name": "sport",
    "include_additional_info": True
}

try:
    response = requests.post(URL, headers=HEADERS, json=PAYLOAD)
    response.raise_for_status()
    data = response.json()
    print(json.dumps(data, indent=2))
except requests.exceptions.RequestException as e:
    print(f"Failed to fetch source information: {e}")
3

Analyze the response

The API response will include information about the requested source(s). Here’s an example response:
JSON
{
  "message": "Maximum sources displayed according to your plan is set to 1000",
  "sources": [
    {
      "name_source": "Sports Illustrated",
      "domain_url": "si.com",
      "logo": null,
      "additional_info": null
    },
    {
      "name_source": "Sportskeeda",
      "domain_url": "sportskeeda.com",
      "logo": null,
      "additional_info": null
    }
    // ... other sources
  ],
  "user_input": {
    "lang": null,
    "countries": null,
    "predefined_sources": null,
    "include_additional_info": true,
    "from_rank": null,
    "to_rank": null,
    "source_name": ["sport"],
    "source_url": null
  }
}
This response shows a list of sources that include “sport” in their names.
Search by source_name does not perform an exact match and returns all sources that contain the specified term anywhere in their names.
4

Check coverage for specific sources

To check coverage for specific sources, you can use the source_url parameter for precise filtering:
Python
PAYLOAD = {
    "source_url": ["si.com", "sportskeeda.com"],
    "include_additional_info": True
}
You can also combine multiple parameters to narrow down your search. For example, to find sports-related sources in English-speaking countries:
Python
PAYLOAD = {
    "source_name": "sport",
    "lang": "en",
    "countries": ["US", "GB", "AU"],
    "include_additional_info": True
}
The response will include information for each covered source that matches your criteria.

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Handling large numbers of sources

When dealing with a large number of sources, you may have them stored in a file (e.g., CSV or JSON). Here’s an approach using asynchronous requests to check which sources are covered by News API v3 and identify those that are not. This implementation uses aiohttp and asyncio libraries for concurrent requests, providing better performance and scalability.
The API key is stored in an environment variable for security purposes. Set your NEWSCATCHER_API_KEY in your environment before running the script.
For example, in a Unix-like terminal (Linux or macOS), you can set it like this: 
export NEWSCATCHER_API_KEY="YOUR_API_KEY_HERE"
On Windows Command Prompt, you can use: 
set NEWSCATCHER_API_KEY="YOUR_API_KEY_HERE"

import aiohttp
import asyncio
import csv
import logging
from typing import List, Dict, Optional
from tqdm.asyncio import tqdm
import os

# Constants
API_KEY: str = os.getenv("NEWSCATCHER_API_KEY")
if not API_KEY:
    raise EnvironmentError("API key not set in environment variables")
URL: str = "https://v3-api.newscatcherapi.com/api/sources"
HEADERS: Dict[str, str] = {"x-api-token": API_KEY}
INPUT_FILE: str = "source_urls.csv"
OUTPUT_FILE: str = "uncovered_sources.csv"
MAX_CONCURRENT_REQUESTS: int = 5  # Set the desired number of concurrent requests
MAX_RETRIES: int = 3  # Number of retries for failed requests
TIMEOUT: int = 30  # Timeout for each request in seconds

# Configure logging
logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s [%(levelname)s] %(message)s",
    handlers=[
 logging.FileHandler("check_sources.log"),  # Log to a file
 logging.StreamHandler(),  # Also log to console
 ],
)


async def fetch_sources(
    session: aiohttp.ClientSession,
    batch: List[str],
    headers: Dict[str, str],
    retries: int = MAX_RETRIES,
) -> Optional[Dict]:
    """Fetch source coverage in a single batch with retry logic."""
 payload: Dict[str, object] = {"source_url": batch, "include_additional_info": True}
    for attempt in range(retries):
        try:
            async with session.post(
 URL, headers=headers, json=payload, timeout=TIMEOUT
 ) as response:
 response.raise_for_status()
 data: Dict = await response.json()
                return data
        except (aiohttp.ClientError, asyncio.TimeoutError) as e:
 logging.error(f"Attempt {attempt + 1}/{retries} failed: {e}")
            await asyncio.sleep(2**attempt)  # Exponential backoff
        except Exception as e:
 logging.error(f"Unexpected error: {e}")
            break
    return None


async def fetch_sources_with_semaphore(
    semaphore: asyncio.Semaphore,
    session: aiohttp.ClientSession,
    batch: List[str],
    headers: Dict[str, str],
) -> Optional[Dict]:
    """Fetch sources with a semaphore to limit the number of concurrent requests."""
    async with semaphore:
        return await fetch_sources(session, batch, headers)


async def check_sources_concurrently(
    source_urls: List[str], batch_size: int = 1000
) -> Dict[str, bool]:
    """Check if sources are covered by the API concurrently."""
 coverage: Dict[str, bool] = {}
 semaphore: asyncio.Semaphore = asyncio.Semaphore(MAX_CONCURRENT_REQUESTS)

    async with aiohttp.ClientSession(
        connector=aiohttp.TCPConnector(limit=MAX_CONCURRENT_REQUESTS)
 ) as session:
 tasks: List[asyncio.Task] = []
 num_batches: int = (
            len(source_urls) + batch_size - 1
 ) // batch_size  # Calculate the number of batches

        # Use tqdm.asyncio for async progress bar
        for i in range(0, len(source_urls), batch_size):
 batch: List[str] = source_urls[i : i + batch_size]
 task: asyncio.Task = fetch_sources_with_semaphore(
 semaphore, session, batch, HEADERS
 )
 tasks.append(task)

        # Use tqdm to visualize the progress of batch processing
 results: List[Optional[Dict]] = await tqdm.gather(
 *tasks, desc="Checking source coverage", unit="batch"
 )

        # Process results
        for i, result in enumerate(results):
            if isinstance(result, Exception):
 logging.error(f"Error processing batch {i+1}: {result}")
                continue
            if result:
                # Mark sources as covered
                for source in result.get("sources", []):
 coverage[source["domain_url"]] = True
                # Mark sources not in the response as uncovered
 batch = source_urls[i * batch_size : (i + 1) * batch_size]
                for url in batch:
                    if url not in coverage:
 coverage[url] = False

 logging.info("Finished checking sources.")
    return coverage


def read_sources_from_csv(file_path: str) -> List[str]:
    """Read source URLs from a CSV file."""
    with open(file_path, "r") as file:
 reader = csv.reader(file)
 sources: List[str] = [
 row[0] for row in reader if row
 ]  # Assuming URLs are in the first column
 logging.info(f"Loaded {len(sources)} sources from {file_path}.")
    return sources


def write_uncovered_sources(uncovered_sources: List[str], file_path: str) -> None:
    """Write uncovered sources to a CSV file."""
    with open(file_path, "w", newline="") as file:
 writer = csv.writer(file)
 writer.writerow(["Uncovered Source URL"])  # Header
        for source in uncovered_sources:
 writer.writerow([source])
 logging.info(f"Uncovered sources written to {file_path}.")


def main() -> None:
    # Read sources from CSV
 source_urls: List[str] = read_sources_from_csv(INPUT_FILE)

    # Check sources coverage concurrently
 coverage: Dict[str, bool] = asyncio.run(check_sources_concurrently(source_urls))

    # Identify uncovered sources
 uncovered_sources: List[str] = [
 url for url, is_covered in coverage.items() if not is_covered
 ]

    # Write uncovered sources to CSV
 write_uncovered_sources(uncovered_sources, OUTPUT_FILE)

 logging.info(f"Total sources: {len(source_urls)}")
 logging.info(f"Covered sources: {len(source_urls) - len(uncovered_sources)}")
 logging.info(f"Uncovered sources: {len(uncovered_sources)}")


if __name__ == "__main__":
 main()
This script does the following:
  1. Reads source URLs from a CSV file.
  2. Asynchronously checks the sources against the API in batches of 1000.
  3. Identifies which sources are not covered by the API.
  4. Writes the uncovered sources to a new CSV file.
To use this script:
  1. Save your list of source URLs in a CSV file named source_urls.csv.
  2. Run the script. It will create a file named uncovered_sources.csv containing the URLs not covered by News API v3.
You can then send the uncovered_sources.csv file to our support team. As News API v3 is a flexible, corporate-level solution, we can manually add the sources you need for your application.
This script assumes that your source URLs are in the first column of the input CSV. Adjust the read_sources_from_csv function if your file has a different structure.

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Best practices

Use the include_additional_info parameter to get insights into source reliability and output volume.
Use source_name for a broader search and the source_url for more precise results.
For large numbers of sources, use the batching method described above to stay within API limits.
Remember that the API may limit the number of sources returned based on your subscription plan.

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See also