56 services carry this tag in their source record. Tags come from the provider, not from us — a tag is a claim about what the service does, not proof that it does it well.
French SIRET (14-digit business establishment number) Luhn checksum validation. Note: the rare La Poste SIREN exception to the standard rule is not applied.
US ABA bank routing number (9-digit) checksum validation.
ISIN (ISO 6166 security identifier) Luhn checksum validation.
ISBN-10 or ISBN-13 checksum validation (auto-detected by length).
IMEI (15-digit mobile device identifier) Luhn checksum validation.
EAN-8 or EAN-13 barcode checksum validation (auto-detected by length).
Luhn checksum validation for digit strings for $0.001 USDC. Call when you need this bounded result without an API key or subscription. Returns machine-readable JSON via x402 on Base or Solana. Limitation: results cover o...
ISBN-10/ISBN-13 checksum validation for $0.001 USDC. Call when you need this bounded result without an API key or subscription. Returns machine-readable JSON via x402 on Base or Solana. Limitation: results cover only the...
Check whether an isolated cart can reach checkout and expose blockers without payment. It never logs in, creates an order or finalizes checkout.
Text hashes: SHA-256, SHA-1, SHA-512 and SHA-384 hex digests of the exact text you send (UTF-8), plus its byte length. Deduplication keys, integrity checks and fingerprints. $0.01 per call.
IBAN validation: mod-97 checksum, country, expected length, bank/branch code split and a formatted version. Payment-form validation without a banking API. $0.01 per check.
Payment card number check: Luhn checksum, card brand from the prefix (Visa, Mastercard, Amex, Discover, JCB, Diners, UnionPay), length validity and masked form. Nothing is stored. Form validation for checkout flows. $0.0...
Checksums of a file at a URL (up to 5 MB): SHA-256, SHA-1 and MD5-free SHA-384 hex digests, the SRI string (sha384-…), byte size, content type, last-modified and ETag, plus the final URL after redirects. Verify downloads...
SHA-256, SHA-384, SHA-512 or SHA-1 of any text in one GET, without an LLM or a local tool: pass text and get the digest as hex or base64. curl: GET /hash?text=hello (algo sha256|sha384|sha512|sha1, default sha256; encodi...
Cheap structural IBAN validation: ISO 13616 checksum + per-country structure/length. Returns valid plus, on rejection, a granular error_type (invalid_checksum, invalid_length, invalid_structure, invalid_country), the cou...
Paid content hash + integrity ledger (cycle 217, x402 $0.01) - GET ?text=<STRING> OR ?data=<BASE64> OR ?sample=1|2|3 OR POST application/json {text|data}. Computes every digest an AI agent needs BEFORE it trusts a downlo...
Paid x402 seller catalog-integrity audit (cycle 185, x402 $0.001) - audits an x402 seller's OWN paid-route catalog for the defects that mechanically suppress demand. GET with no params audits THIS seller live against its...
Paid SMTP credential-leak probe (cycle 158, x402 $0.0005) - actively probes each MX host on ports [25, 465, 587] for credential-handling vulnerabilities. Per-port: opens TCP, reads banner, sends EHLO, captures AUTH mecha...
Paid x402 payment receipt parser + on-chain tx verifier (cycle 151, x402 $0.001) - accepts a server-returned X-PAYMENT-RESPONSE base64 (the canonical x402 settlement receipt) OR a raw transaction hash (0x + 64 hex) which...
Paid CSP x Subresource-Integrity (SRI) verifier (cycle 150, x402 $0.001) - fetches URL HTML, extracts every external <script src=> + <link rel=stylesheet href=>, fetches each asset (200KB cap), computes sha256 + sha384,...
Paid llms.txt multi-target drift monitor (cycle 149, x402 $0.001) - up to 20 domains in parallel via ThreadPoolExecutor; per_host H1 + first-5-URLs + sha256 fingerprint; compares to /tmp/llms_txt_monitor_state.json to de...
Paid Content-Encoding integrity + compression-bomb detector (cycle 141, x402 $0.001) - fetches URL 3x: no Accept-Encoding baseline + Accept-Encoding: gzip + Accept-Encoding: br, gzip; records raw bytes + Content-Length +...
Paid CSP inline-fidelity validator (cycle 130, x402 $0.001) - fetches target URL, parses CSP, extracts every inline <script>/<style> block + event handler, computes sha256 of each, reports per-block {hash_in_csp, nonce_i...
Paid TLS server-cert trust chain inspection (cycle 126, x402 $0.001) - opens TLS via ssl.create_default_context, pulls full DER chain via get_verified_chain(), parses each cert (subject/issuer/not_before/not_after/key_ty...