Decode a JWT and verify its signature with the public keys of a JWKS URL (RS256, ES256, EdDSA...) or an HMAC secret, checking expiry, audience and issuer; returns header, claims and the exact reason if invalid. Tokens are not stored.

EU VAT number format validation for all member states (plus Spanish check digit). Does not query VIES.

Spanish tax ID validation (DNI/NIF, NIE and company CIF) with check-digit verification. Computed locally; the ID is not stored.

Turn an iCal/ICS calendar URL (Google Calendar, Outlook, holidays, events...) into JSON: upcoming events with title, start and end, all-day flag, location, description and link over the next N days; text filter.

Atmospheric CO2 concentration measured by NOAA at Mauna Loa: latest monthly ppm, yearly change, comparison with 10 years ago and with NOAA's first record (May 1974), and the recent series. U.S. Government data.

Active tropical cyclones in the Atlantic and eastern/central Pacific from the US National Hurricane Center: name, type (hurricane, storm...), max wind, pressure, position, movement and links to the official advisory and track.

Species information by scientific or common name from Wikidata (CC0): scientific name, rank, taxonomy (kingdom to species), common names in several languages, conservation status and link.

Official Spanish indicators from INE: CPI (annual and monthly change), EPA unemployment rate (total and under 25) and house prices (annual and quarterly change), with recent periods. Without an indicator it returns the latest value of all.

Test a regular expression against a text: every match with position, groups and named groups, plus the result of a substitution if you pass a replacement. Flags i, m, s, x. Time-limited, safe against catastrophic backtracking.

Query a JSON document with JSONPath, including filters and functions ($.items[?(@.price > 10)].name, $..id...): matching values and their paths. Send the JSON in the data field or a URL to fetch it.

Repair broken JSON, typical of LLM output: strips ```json fences, comments and surrounding text, trailing commas, single quotes, unquoted keys, Python True/None and unclosed brackets. Returns the object and clean JSON and, if you pass a JSON Schema, whether it validates and why not.

CitePulse AI v4.0 — Live Server-Side GEO, Schema.org JSON-LD & /llms.txt Readiness Audit ($0.01 USDC on Base).

Email validation: syntax, domain MX records and disposable-domain flag. Sends no email; the address is not stored.

Check whether a crypto address (Bitcoin, Ethereum/EVM, Tron, Solana, Litecoin, Monero...) is on the US OFAC SDN sanctions list: sanctioned person or entity, program (country or regime) and currency. Compliance check before sending or receiving funds.

Runs SEO Optimizer v2 on your page and up to 3 competitor pages and returns a per-check gap table. Not charged if your page blocks us or is unreachable (422, charged:false).

Topic in, deduplicated story clusters out: headline, every outlet URL and first-seen time, from GDELT and publisher RSS. Headlines and links only, no article text. Not charged when nothing matches or sources fail.

Sprite tools: Clean pixel art: find the true pixel grid, downscale to it, snap to a palette, hard alpha. Full schema: https://rengi.dev/v1/sprite-tools/schema

Use when you need image embeddings or text embeddings in one 2048-dimension space for retrieval, RAG, semantic search, clustering, or dedup (Qwen3-VL-Embedding-2B, OpenAI-compatible). Batch up to 256 items per call, served 32 at a time. An x402 call is $0.002 when the request includes images, $0.001 for text-only. USDC on Base. 400 is a bad body, 413 is over 48 MiB, 429 means busy (Retry-After).

GLB optimizer: Shrink a GLB (up to 10 MB) for web or mobile: dedup, join draw calls, gentle simplify, textures to WebP at a max size, meshopt or Draco compression; before/after renders, size report and loader notes for three.js and Unity. Full schema: https://rengi.dev/v1/glb-optimizer/schema

Sprite tools: Pack frames into one atlas (MaxRects) with padding and edge extrusion; TexturePacker JSON and Unity JSON. Full schema: https://rengi.dev/v1/sprite-tools/schema