# Services from pennyrail.vercel.app on Zero

> pennyrail.vercel.app serves 415 paid API services for AI agents, indexed by Zero. Each is callable per call with payment handled by Zero.

Canonical page: https://www.zero.xyz/host/pennyrail.vercel.app
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/pennyrail.vercel.app/health.json

## Services

- [PennyRail Web Search](https://www.zero.xyz/c/pennyrail-web-search-96fa539e/llms.txt): $0.02/call via x402. Performs a live web search and returns a grounded answer with cited sources, paid per-query via $0.02 USDC on Base.
- [PennyRail Web Extract to Markdown](https://www.zero.xyz/c/pennyrail-web-extract-to-markdown-032b291b/llms.txt): $0.005/call via x402. Fetches a public URL and returns its main content as clean Markdown, stripping navigation and boilerplate using a browser-backed reader.
- [PennyRail JSON Path Query](https://www.zero.xyz/c/pennyrail-json-path-query-ab00710a/llms.txt): $0.001/call via x402. Extracts a value from a JSON object using dot/bracket path notation (e.g. items[2].name), returning the found status, value, and normalized path deterministically.
- [PennyRail BatchRail Trial](https://www.zero.xyz/c/pennyrail-batchrail-trial-abe3e6a8/llms.txt): $0.05/call via x402. Classifies up to 100 short text items against custom labels in a single low-cost trial batch call for $0.05 USDC.
- [PennyRail x402 Quote Inspector](https://www.zero.xyz/c/pennyrail-x402-quote-inspector-9466df35/llms.txt): $0.002/call via x402. Probes a public HTTP endpoint and decodes its HTTP 402 payment requirements into structured JSON, returning network, asset, amount, pay-to address, and challenge metadata.
- [PennyRail Naive Baseline Forecaster](https://www.zero.xyz/c/pennyrail-naive-baseline-forecaster-b8e86dd5/llms.txt): $0.001/call via x402. Generates mean, naive, and drift baseline time-series forecasts with 95% prediction intervals as a sanity-check floor before using more complex models.
- [PennyRail VIN Decode – Vehicle Identification Number Lookup](https://www.zero.xyz/c/pennyrail-vin-decode-vehicle-identification-number-lookup-03b53554/llms.txt): $0.004/call via x402. Decodes a Vehicle Identification Number (VIN) to return structured vehicle details such as make, model, year, and specifications.
- [PennyRail VIN Decode – Vehicle Specs from VIN](https://www.zero.xyz/c/pennyrail-vin-decode-vehicle-specs-from-vin-ff63a309/llms.txt): $0.004/call via x402. Decodes a Vehicle Identification Number (VIN) to return detailed vehicle specifications and attributes
- [PennyRail OpenAPI Payload Validator](https://www.zero.xyz/c/pennyrail-openapi-payload-validator-2157fdf1/llms.txt): $0.001/call via x402. Validates a JSON request or response body against an OpenAPI 3.x/Swagger 2.x operation schema using deterministic JSON-Schema rules, with no external calls.
- [PennyRail Hacker News Search & Front Page](https://www.zero.xyz/c/pennyrail-hacker-news-search-front-page-f05358bc/llms.txt): $0.005/call via x402. Search Hacker News stories and comments or fetch current front-page results via the Algolia HN index, returning clean JSON with titles, URLs, authors, points, comment counts, and timestamps.
- [PennyRail Word Frequency Analyzer](https://www.zero.xyz/c/pennyrail-word-frequency-analyzer-52f7075a/llms.txt): $0.001/call via x402. Counts and ranks word occurrences in a given text string, returning frequency data for each word
- [PennyRail text-embedding-3-large (Large Text Embedding)](https://www.zero.xyz/c/pennyrail-text-embedding-3-large-large-text-embedding-550414a8/llms.txt): $0.01/call via x402. Generates high-dimensional vector embeddings for input text using OpenAI's text-embedding-3-large model, accessible via micropayment-gated API
- [PennyRail OSV Package Dependency Vulnerability Check](https://www.zero.xyz/c/pennyrail-osv-package-dependency-vulnerability-check-f652254b/llms.txt): $0.004/call via x402. Checks a software package or dependency for known security vulnerabilities using the OSV (Open Source Vulnerabilities) database
- [PennyRail Number Stats – Mean & Median](https://www.zero.xyz/c/pennyrail-number-stats-mean-median-153cbf4d/llms.txt): $0.001/call via x402. Computes descriptive statistics (mean and median) for a provided array of numbers
- [PennyRail Unix Timestamp to ISO 8601 Converter](https://www.zero.xyz/c/pennyrail-unix-timestamp-to-iso-8601-converter-021d31be/llms.txt): $0.001/call via x402. Converts a Unix timestamp (integer) to an ISO 8601 formatted datetime string
- [PennyRail Text – Remove Empty Lines](https://www.zero.xyz/c/pennyrail-text-remove-empty-lines-a2ae7f53/llms.txt): $0.001/call via x402. Removes empty and blank lines from a given text string, returning the cleaned text.
- [PennyRail Email Extractor](https://www.zero.xyz/c/pennyrail-email-extractor-3bc62a3c/llms.txt): $0.001/call via x402. Extracts all email addresses found within an input text string
- [PennyRail OpenAI Token Counter](https://www.zero.xyz/c/pennyrail-openai-token-counter-042de6cc/llms.txt): $0.001/call via x402. Counts the number of OpenAI tokens in a given text input using OpenAI-compatible tokenization
- [EVM Address Label / Known Address Lookup](https://www.zero.xyz/c/evm-address-label-known-address-lookup-993935c1/llms.txt): $0.002/call via x402. Looks up human-readable labels for known EVM blockchain addresses (e.g. exchange names, protocol contracts, wallet tags)
- [PennyRail JWT Decode](https://www.zero.xyz/c/pennyrail-jwt-decode-8914c620/llms.txt): $0.05/call via x402. Decodes a JWT (JSON Web Token) and returns its header, payload, and signature components without verification
- [PennyRail VIN Decoder](https://www.zero.xyz/c/pennyrail-vin-decoder-ae07abef/llms.txt): $0.004/call via x402. Decodes a Vehicle Identification Number (VIN) to return structured vehicle information such as make, model, year, and specifications
- [PennyRail Text Slugify — URL Slug Generator](https://www.zero.xyz/c/pennyrail-text-slugify-url-slug-generator-723aeb98/llms.txt): $0.001/call via x402. Converts a plain-text string into a URL-safe slug by normalizing, lowercasing, and replacing spaces/special characters with hyphens
- [PennyRail URL Decode (decodeURIComponent)](https://www.zero.xyz/c/pennyrail-url-decode-decodeuricomponent-7ea89197/llms.txt): $0.001/call via x402. Decodes a percent-encoded URL string using the decodeURIComponent algorithm, returning the fully decoded string
- [PennyRail Number to Roman Numeral Converter](https://www.zero.xyz/c/pennyrail-number-to-roman-numeral-converter-786665b5/llms.txt): $0.001/call via x402. Converts a numeric integer input into its Roman numeral string representation
- [PennyRail Base64 Decode](https://www.zero.xyz/c/pennyrail-base64-decode-cc483e29/llms.txt): $0.001/call via x402. Decodes a Base64-encoded string back into its original plaintext representation
- [PennyRail Email Extractor](https://www.zero.xyz/c/pennyrail-email-extractor-30afa847/llms.txt): $0.001/call via x402. Extracts all email addresses from a given text string and returns them as structured output
- [PennyRail JWT Inspect](https://www.zero.xyz/c/pennyrail-jwt-inspect-2dd92d12/llms.txt): $0.05/call via x402. Inspects and decodes a JWT token, returning its header, payload, and signature components
- [PennyRail Email Extractor](https://www.zero.xyz/c/pennyrail-email-extractor-d598abea/llms.txt): $0.001/call via x402. Extracts all email addresses found within a given input string
- [PennyRail VIN Decode](https://www.zero.xyz/c/pennyrail-vin-decode-1eed57a7/llms.txt): $0.004/call via x402. Decodes a Vehicle Identification Number (VIN) to return structured vehicle information such as make, model, year, and specifications.
- [PennyRail Word Frequency Counter](https://www.zero.xyz/c/pennyrail-word-frequency-counter-fbc0416d/llms.txt): $0.001/call via x402. Counts the frequency of each word in a given text input, returning word counts as structured data
- [PennyRail Alphabetize Lines](https://www.zero.xyz/c/pennyrail-alphabetize-lines-559022ff/llms.txt): $0.001/call via x402. Sorts lines of text alphabetically, returning them in A-Z order
- [PennyRail npm Package Info Lookup](https://www.zero.xyz/c/pennyrail-npm-package-info-lookup-0471e797/llms.txt): $0.003/call via x402. Fetches the latest metadata for an npm package by name via a paid settlement endpoint
- [PennyRail SHA-256 Text Hashing](https://www.zero.xyz/c/pennyrail-sha-256-text-hashing-c9403a8c/llms.txt): $0.001/call via x402. Computes the SHA-256 cryptographic hash of a given input string, returning the hex digest
- [PennyRail Text Lines Deduplicator](https://www.zero.xyz/c/pennyrail-text-lines-deduplicator-dc9befce/llms.txt): $0.001/call via x402. Removes duplicate lines from a multi-line text string, returning only unique lines
- [PennyRail OSV Package Vulnerability Lookup](https://www.zero.xyz/c/pennyrail-osv-package-vulnerability-lookup-1623942d/llms.txt): $0.004/call via x402. Queries the OSV (Open Source Vulnerabilities) database to return known security vulnerabilities for a given software package
- [PennyRail Integer to Roman Numeral Converter](https://www.zero.xyz/c/pennyrail-integer-to-roman-numeral-converter-e1638a58/llms.txt): $0.001/call via x402. Converts an integer number into its Roman numeral string representation
- [PennyRail Text Lines Deduplication](https://www.zero.xyz/c/pennyrail-text-lines-deduplication-832e1dee/llms.txt): $0.001/call via x402. Removes duplicate lines from a multi-line text string, returning only unique lines
- [PennyRail Text Statistics](https://www.zero.xyz/c/pennyrail-text-statistics-ae0be5d9/llms.txt): $0.001/call via x402. Computes character count, word count, sentence count, and estimated reading time for a given text string
- [PennyRail ROT13 Text Encoder](https://www.zero.xyz/c/pennyrail-rot13-text-encoder-e9cdd496/llms.txt): $0.001/call via x402. Encodes a given input string using the ROT13 Caesar cipher substitution, shifting each alphabetic character by 13 positions
- [PennyRail URL Query String to JSON Converter](https://www.zero.xyz/c/pennyrail-url-query-string-to-json-converter-6ca8fcc3/llms.txt): $0.001/call via x402. Parses a URL or query string and returns its query parameters as a structured JSON object
- [PennyRail Text Slugify](https://www.zero.xyz/c/pennyrail-text-slugify-5c6a27ec/llms.txt): $0.001/call via x402. Converts a text string into a URL-safe slug by removing special characters, lowercasing, and replacing spaces with hyphens
- [PennyRail HTML Entity Encoder](https://www.zero.xyz/c/pennyrail-html-entity-encoder-f1c5f40e/llms.txt): $0.001/call via x402. Encodes a text string into HTML entities, escaping special characters for safe embedding in HTML documents
- [PennyRail JWT Verify HMAC](https://www.zero.xyz/c/pennyrail-jwt-verify-hmac-a26e7c70/llms.txt): $0.05/call via x402. Verifies a JWT token using HMAC signature validation and returns the verification result
- [PennyRail DNS A Record Lookup](https://www.zero.xyz/c/pennyrail-dns-a-record-lookup-4519a7bd/llms.txt): $0.003/call via x402. Performs a DNS A record lookup for a given hostname, returning the resolved IPv4 address(es)
- [PennyRail Email Address Validation](https://www.zero.xyz/c/pennyrail-email-address-validation-5b3af5d5/llms.txt): $0.001/call via x402. Validates whether a given email address is properly formatted and deliverable
- [PennyRail FX Currency Converter](https://www.zero.xyz/c/pennyrail-fx-currency-converter-ae33536d/llms.txt): $0.003/call via x402. Converts an amount from one currency to another using real-time foreign exchange rates
- [PennyRail URL Encoder](https://www.zero.xyz/c/pennyrail-url-encoder-96f31c8a/llms.txt): $0.001/call via x402. URL-encodes a given string, percent-encoding special characters for safe use in URLs
- [PennyRail URL Normalizer](https://www.zero.xyz/c/pennyrail-url-normalizer-b61dda7c/llms.txt): $0.001/call via x402. Normalizes a URL string into a canonical, cleaned form by resolving inconsistencies in formatting, encoding, and structure
- [PennyRail OSV Package Vulnerability Check](https://www.zero.xyz/c/pennyrail-osv-package-vulnerability-check-d9d3af38/llms.txt): $0.004/call via x402. Checks whether a specific package version is vulnerable according to the OSV (Open Source Vulnerabilities) database
- [PennyRail URL Parse / Split URL](https://www.zero.xyz/c/pennyrail-url-parse-split-url-e83bb3b2/llms.txt): $0.001/call via x402. Parses and splits a URL string into its component parts (protocol, host, path, query, etc.)
- [PennyRail Text Lines Deduplicator](https://www.zero.xyz/c/pennyrail-text-lines-deduplicator-9cc66748/llms.txt): $0.001/call via x402. Removes duplicate lines from a multi-line text string, returning only unique lines
- [PennyRail URL Extractor](https://www.zero.xyz/c/pennyrail-url-extractor-435300da/llms.txt): $0.001/call via x402. Extracts and finds all URLs present within a given text string
- [PennyRail Text Cleaner – Remove Empty Lines](https://www.zero.xyz/c/pennyrail-text-cleaner-remove-empty-lines-1de80690/llms.txt): $0.001/call via x402. Strips all empty and blank lines from a given text string, returning a cleaned version with no whitespace-only lines
- [PennyRail DNS A-Record Resolver](https://www.zero.xyz/c/pennyrail-dns-a-record-resolver-43411b92/llms.txt): $0.003/call via x402. Resolves a domain name to its IPv4 address(es) via a paid DNS A-record lookup
- [PennyRail Strip Tracking URL](https://www.zero.xyz/c/pennyrail-strip-tracking-url-11d00671/llms.txt): $0.001/call via x402. Removes tracking parameters from a URL, returning a clean, privacy-preserving version
- [PennyRail OSV Package Lookup](https://www.zero.xyz/c/pennyrail-osv-package-lookup-26bad178/llms.txt): $0.004/call via x402. Looks up known security vulnerabilities for a software package using the OSV (Open Source Vulnerabilities) database
- [PennyRail Text Stats – Character Count](https://www.zero.xyz/c/pennyrail-text-stats-character-count-b253823e/llms.txt): $0.001/call via x402. Counts the number of characters in a given text string and returns the result as a JSON payload
- [PennyRail Text Lowercase Converter](https://www.zero.xyz/c/pennyrail-text-lowercase-converter-2731b5e4/llms.txt): $0.001/call via x402. Converts an input string to all lowercase characters via a paid micro-settlement API endpoint
- [PennyRail Word Frequency Counter](https://www.zero.xyz/c/pennyrail-word-frequency-counter-54c80396/llms.txt): $0.001/call via x402. Counts the frequency of each word in a given text string, returning word occurrence statistics
- [PennyRail Text Normalize Whitespace / Collapse Whitespace](https://www.zero.xyz/c/pennyrail-text-normalize-whitespace-collapse-

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