Building cool web tools

Ori Tzvielli  • Peerlist

<h3>Tools &amp; APIs for AI agents.</h3><ul><li>Pay on demand with no friction, accounts, API keys, or subscriptions.</li><li>Find a tool, pay on demand per usage, get the result, and continue.</li><li>All interactions are handled with a single HTTP request.</li></ul><h3>How it works:</h3><ol><li>Agent reads metadata: The agent receives an endpoint and an OpenAPI spec along with payment details.</li><li>Sees 402 response: The server returns an HTTP 402 status code with a signed payment requirement in USDC.</li><li>Signs &amp; pays onchain: The agent's wallet broadcasts a USDC microtransaction on the Base network, requiring no human intervention.</li><li>Gets the result: The server verifies the payment header and returns the API response.</li></ol><h3>Available APIs include:</h3><ul><li>CORS Header Checker: Verifies cross-origin permissions for a given URL and origin.</li><li>US CPI Data &amp; Inflation Report: Retrieves official US inflation numbers (CPI) for specific months or historical ranges.</li><li>HTTP Request: Makes real HTTP requests from the cloud and returns status code, headers, and body.</li><li>Bulk DMARC Record Lookup: Checks DMARC email security configuration for multiple domains.</li><li>DNS &amp; WHOIS Lookup: Retrieves all 13 DNS record types and WHOIS registration data for domains.</li><li>Domain Age Checker: Provides registration date, expiration date, age, and time remaining for domains.</li><li>Domain Availability Checker: Checks domain registration status using the RDAP protocol.</li><li>Hacker News Data Fetch: Retrieves Hacker News stories, jobs, polls, and comments by category or date.</li><li>Hashing, HMAC &amp; Checksum Suite: Computes cryptographic hashes, HMAC signatures, and verifies webhook signatures.</li><li>HTTP Status Code Checker: Checks the live status of URLs and detects redirects.</li><li>JSON Suite: Validates, repairs, converts, queries, and diffs JSON data.</li><li>Leetspeak Translator: Converts text to and from leetspeak.</li><li>Mortgage &amp; Loan Amortization Calculator: Calculates monthly payments and loan amortization schedules.</li><li>TCP Port Scanner: Scans host and port ranges to identify open ports and services.</li><li>Bulk QR Code Generator: Creates QR code images from lists of text or URLs.</li><li>SEO Data Extractor: Extracts key SEO fields from a webpage.</li><li>Shopify AI Rank Checker: Checks Shopify product rankings in AI shopping assistants.</li><li>Sitemap URL Extractor: Extracts all URLs from a sitemap.xml file.</li></ul>