# Services from agentshelf.syntexa.ch on Zero

> agentshelf.syntexa.ch serves 1182 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/agentshelf.syntexa.ch
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/agentshelf.syntexa.ch/health.json

## Services

- [AgentShelf Page Audit](https://www.zero.xyz/c/agentshelf-page-audit-2e614edf/llms.txt): $0.01/call via x402. Performs a structured SEO and technical audit of a public URL, returning an overall score (0–100), HTTPS status, meta tags, robots directives, canonical tags, JSON-LD, H1 counts, load hints, and a list of issues.
- [AgentShelf RSS/Atom Feed Parser](https://www.zero.xyz/c/agentshelf-rss-atom-feed-parser-8b86e075/llms.txt): $0.004/call via x402. Fetches and parses an RSS or Atom feed URL into structured items including title, link, published date, and summary (up to 50 items), with SSRF protection.
- [AgentShelf Email Extractor](https://www.zero.xyz/c/agentshelf-email-extractor-1eeadce0/llms.txt): $0.003/call via x402. Extracts de-duplicated public email addresses (up to 100) from a given page URL or raw HTML
- [SHAKE256 Digest Base64URL Encoder](https://www.zero.xyz/c/shake256-digest-base64url-encoder-f6435695/llms.txt): $0.007/call via x402. Computes a SHAKE256 hash of input text with an optional key and returns the digest encoded as base64url
- [SHA-384 Digest Base64 Encoder](https://www.zero.xyz/c/sha-384-digest-base64-encoder-fe9a8297/llms.txt): $0.004/call via x402. Computes the SHA-384 cryptographic hash of a given text string and returns it encoded as base64
- [SHA-256 Base64 Digest (agentshelf.syntexa.ch)](https://www.zero.xyz/c/sha-256-base64-digest-agentshelf-syntexa-ch-7a5f9d15/llms.txt): $0.01/call via x402. Computes a SHA-256 cryptographic hash of input text and returns the digest encoded as a Base64 string, with no network calls or LLM involvement.
- [agentshelf.syntexa.ch URL to Markdown](https://www.zero.xyz/c/agentshelf-syntexa-ch-url-to-markdown-60120d4b/llms.txt): $0.005/call via x402. Fetches the main content of a public HTTP(S) URL and returns it as Markdown along with the page title and final resolved URL, with SSRF protection.
- [Syntexa AgentShelf CSS Selector Extractor](https://www.zero.xyz/c/syntexa-agentshelf-css-selector-extractor-719cfdd3/llms.txt): $0.004/call via x402. Extracts text and attributes from a public webpage or raw HTML using user-specified CSS selectors, with SSRF protection and a node cap.
- [AgentShelf JSON-LD Extractor](https://www.zero.xyz/c/agentshelf-json-ld-extractor-64561a49/llms.txt): $0.004/call via x402. Extracts JSON-LD structured data blocks from a public web page URL or raw HTML content, safely guarded against SSRF.
- [AgentShelf Link Status Checker](https://www.zero.xyz/c/agentshelf-link-status-checker-63d0b784/llms.txt): $0.01/call via x402. Performs HTTP HEAD requests on up to 20 public URLs and returns status codes, SSRF-safe, for $0.01 USDC per call.
- [agentshelf.syntexa.ch Extract Meta Tags](https://www.zero.xyz/c/agentshelf-syntexa-ch-extract-meta-tags-8afd1399/llms.txt): $0.003/call via x402. Extracts all key metadata from a public web page including title, description, canonical URL, robots directives, Open Graph tags, Twitter Card tags, and favicons
- [Syntexa AgentShelf Readability Extractor](https://www.zero.xyz/c/syntexa-agentshelf-readability-extractor-5dd79502/llms.txt): $0.005/call via x402. Fetches a public URL and returns Mozilla Readability-parsed article content as Markdown, plus title, byline, excerpt, and final URL — SSRF-safe, paid via x402.
- [agentshelf.syntexa.ch XPath Meta Description Extractor](https://www.zero.xyz/c/agentshelf-syntexa-ch-xpath-meta-description-extractor-918953f6/llms.txt): $0.002/call via x402. Extracts the content of the HTML meta description tag (meta[name='description']) from a public URL or raw HTML string, SSRF-safe.
- [Phone Number E.164 Normalizer](https://www.zero.xyz/c/phone-number-e-164-normalizer-de49aad3/llms.txt): $0.002/call via x402. Normalizes a phone number string to E.164 international format given a known country region code, with no external network calls.
- [AgentShelf Text Chunker](https://www.zero.xyz/c/agentshelf-text-chunker-2e7d481b/llms.txt): $0.002/call via x402. Splits a text string into overlapping chunks by character count or token count, returning an array of text segments suitable for downstream processing.
- [Syntexa AgentShelf Language Detection](https://www.zero.xyz/c/syntexa-agentshelf-language-detection-075419d6/llms.txt): $0.002/call via x402. Heuristically detects the natural language of a given text string without using an LLM or external network calls.
- [AgentShelf CSS Headings Extractor](https://www.zero.xyz/c/agentshelf-css-headings-extractor-3e850a40/llms.txt): $0.004/call via x402. Extracts all heading text (h1–h6) from a public webpage URL or raw HTML string, returning structured heading data in an SSRF-safe manner.
- [AgentShelf Profile Main Text Extractor](https://www.zero.xyz/c/agentshelf-profile-main-text-extractor-75c97851/llms.txt): $0.007/call via x402. Extracts the main body text from a public web page URL or raw HTML, with SSRF protection
- [agentshelf.syntexa.ch JSON Repair](https://www.zero.xyz/c/agentshelf-syntexa-ch-json-repair-4005a2be/llms.txt): $0.002/call via x402. Deterministically repairs malformed or broken JSON text and returns the fixed JSON along with a list of transforms applied
- [AgentShelf JSONPath Query Evaluator](https://www.zero.xyz/c/agentshelf-jsonpath-query-evaluator-60cf5b2f/llms.txt): $0.002/call via x402. Evaluates a JSONPath expression against a provided JSON value and returns the matching results, with no external network calls.
- [agentshelf.syntexa.ch IP Geolocation](https://www.zero.xyz/c/agentshelf-syntexa-ch-ip-geolocation-69ea78c6/llms.txt): $0.003/call via x402. Looks up geographic location, ASN, and ISP data for a given public IP address
- [AgentShelf CSS Main Text Extractor](https://www.zero.xyz/c/agentshelf-css-main-text-extractor-aacb235a/llms.txt): $0.004/call via x402. Extracts the main body text from a public web page or HTML string using CSS-based heuristics, with SSRF protection.
- [agentshelf.syntexa.ch HTML to Plain Text](https://www.zero.xyz/c/agentshelf-syntexa-ch-html-to-plain-text-279992ae/llms.txt): $0.001/call via x402. Converts an HTML string to plain text by stripping all scripts, styles, and markup tags
- [HTML to Markdown Converter](https://www.zero.xyz/c/html-to-markdown-converter-44b41fbc/llms.txt): $0.002/call via x402. Converts raw HTML content to clean markdown format, with optional base URL for resolving relative links
- [SHA-256 Base64URL Digest](https://www.zero.xyz/c/sha-256-base64url-digest-d11fe681/llms.txt): $0.001/call via x402. Computes a SHA-256 cryptographic hash of input text and returns it encoded as a base64url string, with no network or LLM involvement.
- [agentshelf.syntexa.ch HTML Sanitizer](https://www.zero.xyz/c/agentshelf-syntexa-ch-html-sanitizer-474b411f/llms.txt): $0.003/call via x402. Sanitizes HTML input against an allowlist of safe tags and URLs, stripping dangerous content without any network calls
- [Syntexa AgentShelf Hreflang List Extractor](https://www.zero.xyz/c/syntexa-agentshelf-hreflang-list-extractor-6d79e380/llms.txt): $0.003/call via x402. Extracts all hreflang alternate link elements from a public URL or raw HTML, returning a structured list of language/region alternates.
- [agentshelf.syntexa.ch HMAC-SHA512 Hex](https://www.zero.xyz/c/agentshelf-syntexa-ch-hmac-sha512-hex-cfcbec88/llms.txt): $0.001/call via x402. Computes an HMAC-SHA512 digest of a given text using a caller-supplied secret key, returning the result as a lowercase hex string.
- [HMAC-SHA512 Base64 Signing](https://www.zero.xyz/c/hmac-sha512-base64-signing-f1e7872a/llms.txt): $0.002/call via x402. Computes an HMAC-SHA512 signature of a given text using a caller-supplied key and returns the result encoded as base64.
- [HMAC-SHA384 Base64url Signer](https://www.zero.xyz/c/hmac-sha384-base64url-signer-68d3e65d/llms.txt): $0.01/call via x402. Computes an HMAC-SHA384 digest of text using a caller-supplied key and returns it encoded as base64url
- [HMAC-SHA256 Hex Digest API](https://www.zero.xyz/c/hmac-sha256-hex-digest-api-09890f24/llms.txt): $0.005/call via x402. Computes an HMAC-SHA256 message authentication code over a given text using a caller-supplied key, returning the result as a lowercase hexadecimal string.
- [HMAC-SHA256 Base64URL Signer](https://www.zero.xyz/c/hmac-sha256-base64url-signer-52bf9c6d/llms.txt): $0.007/call via x402. Computes an HMAC-SHA256 message authentication code of input text using a caller-supplied key, returning the result encoded as base64url.
- [HMAC-SHA1 Hex Signer](https://www.zero.xyz/c/hmac-sha1-hex-signer-76c868ac/llms.txt): $0.002/call via x402. Computes an HMAC-SHA1 of a given text using a caller-supplied key and returns the result as a lowercase hex string.
- [AgentShelf CSV to JSON Converter](https://www.zero.xyz/c/agentshelf-csv-to-json-converter-a9139872/llms.txt): $0.002/call via x402. Converts a CSV string into a JSON array of objects, with optional delimiter configuration, at a fixed cost of $0.002 USDC per call.
- [agentshelf.syntexa.ch Unified Diff Text](https://www.zero.xyz/c/agentshelf-syntexa-ch-unified-diff-text-4d2cf033/llms.txt): $0.002/call via x402. Computes a unified diff between two input strings and returns the diff output, with no network calls and a fixed cost of $0.002 USDC.
- [AgentShelf Words Diff](https://www.zero.xyz/c/agentshelf-words-diff-ce845c3f/llms.txt): $0.01/call via x402. Computes a word-level diff between two input strings and returns the differences, with no network dependencies.
- [HMAC-BLAKE2b-512 Base64URL Generator](https://www.zero.xyz/c/hmac-blake2b-512-base64url-generator-0e8eba9b/llms.txt): $0.001/call via x402. Computes an HMAC-BLAKE2b-512 digest of input text using a caller-supplied key and returns the result encoded as base64url
- [AgentShelf CSS Table Cell (td) Extractor](https://www.zero.xyz/c/agentshelf-css-table-cell-td-extractor-8e7a95fb/llms.txt): $0.006/call via x402. Extracts text content from HTML table cells (td elements) in a public webpage or raw HTML using CSS selection, returning the matched cell values.
- [AgentShelf BLAKE2s-256 / Base32 Digest](https://www.zero.xyz/c/agentshelf-blake2s-256-base32-digest-5e30f5c3/llms.txt): $0.002/call via x402. Computes a BLAKE2s-256 cryptographic hash of input text and returns it encoded as a Base32 string, with no network calls or LLM involvement.
- [BLAKE2s-256 Base64 Digest](https://www.zero.xyz/c/blake2s-256-base64-digest-8403e15e/llms.txt): $0.01/call via x402. Computes a BLAKE2s-256 cryptographic hash of input text and returns it encoded as a base64 string
- [BLAKE2s-256 Digest as Base64URL](https://www.zero.xyz/c/blake2s-256-digest-as-base64url-d8798533/llms.txt): $0.001/call via x402. Computes a BLAKE2s-256 cryptographic hash of input text and returns it encoded as base64url, with no network calls or LLM involved.
- [MD5 Digest Encoded as Base32](https://www.zero.xyz/c/md5-digest-encoded-as-base32-797532e0/llms.txt): $0.004/call via x402. Computes the MD5 hash of a given text string and returns it encoded in Base32 format, entirely offline with no network or LLM calls.
- [AgentShelf DNS TXT SPF Lookup](https://www.zero.xyz/c/agentshelf-dns-txt-spf-lookup-a6774c39/llms.txt): $0.002/call via x402. Fetches the SPF TXT record (v=spf1...) from the DNS of a given hostname
- [MD5 Digest Base64 Encoder](https://www.zero.xyz/c/md5-digest-base64-encoder-5aab2dc6/llms.txt): $0.002/call via x402. Computes the MD5 hash of a given text string and returns it encoded as base64, with no network calls or LLM involved.
- [AgentShelf MD5 Hex Digest](https://www.zero.xyz/c/agentshelf-md5-hex-digest-a8e72b4a/llms.txt): $0.001/call via x402. Computes the MD5 hash of a given text string and returns it as a lowercase hexadecimal digest, with no network or LLM calls involved.
- [DKIM Selector3 TXT Record Lookup](https://www.zero.xyz/c/dkim-selector3-txt-record-lookup-f9ac6666/llms.txt): $0.01/call via x402. Retrieves the DKIM TXT record at selector3._domainkey.{hostname} via DNS lookup
- [AgentShelf JSON-LD Course Extractor](https://www.zero.xyz/c/agentshelf-json-ld-course-extractor-412ba0ff/llms.txt): $0.009/call via x402. Extracts JSON-LD @type Course structured data from a public webpage URL or raw HTML, SSRF-safe, for $0.009 USDC per call.
- [RIPEMD-160 Digest Base64 Encoder](https://www.zero.xyz/c/ripemd-160-digest-base64-encoder-7aa24465/llms.txt): $0.004/call via x402. Computes a RIPEMD-160 cryptographic hash of input text and returns the digest encoded as a base64 string
- [RIPEMD-160 Hex Digest](https://www.zero.xyz/c/ripemd-160-hex-digest-0e8114a9/llms.txt): $0.003/call via x402. Computes the RIPEMD-160 cryptographic hash of input text and returns it as a lowercase hexadecimal string
- [DKIM Selector1 TXT Record Lookup](https://www.zero.xyz/c/dkim-selector1-txt-record-lookup-5a042b20/llms.txt): $0.01/call via x402. Fetches the DKIM TXT record at selector1._domainkey.{hostname} via DNS lookup
- [SHA-1 Base32 Digest](https://www.zero.xyz/c/sha-1-base32-digest-55a7051c/llms.txt): $0.008/call via x402. Computes the SHA-1 hash of a given text and returns it encoded as a Base32 string, with no network or LLM involvement.
- [Belgium VAT Checksum Validator](https://www.zero.xyz/c/belgium-vat-checksum-validator-1b2e0a41/llms.txt): $0.009/call via x402. Validates whether a Belgian VAT number has a correct checksum using pure algorithmic verification, without performing any live registry lookup.
- [SHA-1 Base64 Digest](https://www.zero.xyz/c/sha-1-base64-digest-30dc7374/llms.txt): $0.006/call via x402. Computes a SHA-1 hash of input text and returns it encoded as a base64 string, with no network or LLM involvement.
- [AgentShelf DNS TXT DKIM ProtonMail Lookup](https://www.zero.xyz/c/agentshelf-dns-txt-dkim-protonmail-lookup-c849c10d/llms.txt): $0.007/call via x402. Looks up the DKIM TXT DNS record for ProtonMail (protonmail._domainkey) at a given hostname
- [SHA-1 Base64URL Digest](https://www.zero.xyz/c/sha-1-base64url-digest-1c07dfbe/llms.txt): $0.007/call via x402. Computes the SHA-1 hash of an input text string and returns it encoded as a base64url string, with no network or LLM calls involved.
- [AgentShelf DNS AAAA Lookup](https://www.zero.xyz/c/agentshelf-dns-aaaa-lookup-de0fde5f/llms.txt): $0.007/call via x402. Resolves a hostname to its IPv6 (AAAA) addresses via DNS lookup, returning an error if no AAAA records exist.
- [SHA-224 Digest with Base32 Encoding](https://www.zero.xyz/c/sha-224-digest-with-base32-encoding-ad30ea02/llms.txt)

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