Monitor X/Twitter for changes - pass a search query and (optionally) a cursor from your last check, get back ONLY what's new since then, plus an AI change summary. Cursor-based so an agent never re-reads the same tweets. Brand monitoring, keyword alerts, competitor tracking. ?query=<advanced search>&since=<ISO timestamp or tweet id>. First call (no since) returns a baseline of the latest 20 + a cursor to pass next time.

$0.005/call. Convert Word, Excel, or PowerPoint to PDF via LibreOffice — layout preserved. 1¢ x402 min; remainder auto-credits — relaystation.ai/penny

Official Croatian company registry lookup (Sudski registar, court register, daily open-API snapshot). Query: /v1/eu/entreprise/HR/92803032010 (11-digit OIB; 8- or 9-digit MBS accepted). Returns identity (name, short name, form, seat, VAT id HR+OIB, founding date), status with the running procedure, court, capital, main activity (NKD), published e-mails, LEI group and EU funding blocks. Legal persons only: a sole trader (t.p.) or undecided form returns 404, not billed.

$0.005/extract. Extract the clean article text — title, byline, body — from any public URL. No boilerplate, no nav junk. 1¢ x402 min; remainder auto-credits — relaystation.ai/penny

X/Twitter person lookup for AI agents - send a handle, get an enriched person card: name, role, company, what they work on, topics, seniority guess, and contact routes (emails found on their site/bio, LinkedIn, GitHub, X DM-open flag). Lead gen, recruiting, sales prospecting, cofounder search. Non-LLM facts: followers, account age, posts/week, website. ?username=naval. Free sample: /x/person/example.

Google Maps Nearby Search (Full). Finds places near a latitude/longitude using Google Places supported type filters. Use google-maps/text-search/full for natural-language searches like "wedding planner" or "event planner".

Render PDF pages to PNG or JPEG at 50-300 dpi (for vision models, previews or thumbnails). $0.008 + $0.001 per page (max_pages up to 50, default 10); continue with first_page. Also callable as GET with the same fields as query parameters.

The daily US Treasury par yield curve (Constant Maturity Treasury rates) for every maturity from 1 month to 30 years, in percent. Defaults to the latest published day; pass `?limit=` for more recent days (max 250) and `?year=YYYY`. No ticker needed. Use for the risk-free rate, rate-sensitivity context, and yield-curve inversion in macro-aware analysis. From x402stock

Use when an agent needs b402 preflight. Returns Validate BNB/B402 payment intent freshness, recipient, amount, deadline, fee cap, public BNB balance, and recent activity without custody or payment relay. $0.01.

Crypto Fear & Greed index — the market sentiment gauge (0 = extreme fear, 100 = extreme greed) with today's value, classification, and 7-day trend as JSON. Use for: crypto market sentiment, fear and greed check, contrarian signals, risk-on/risk-off timing, sentiment-driven trading. $0.001 USDC per call.

File hosting: upload a file (text, base64 or copy from a URL) and get a public link that lasts up to 7 days. Images, PDF, text, Markdown, CSV, JSON and audio up to 1 MB. Served safely sandboxed. Also callable as GET with the same fields as query parameters.

Cluster and label: groups up to 500 texts (reviews, tickets, survey answers, search results) into topics with an AI-written label, size, share and examples for each group. Also callable as GET with the same fields as query parameters.

PDF forms: list the fillable fields of any PDF, fill them (text, checkboxes, dropdowns) and optionally flatten, or merge up to 10 PDFs into one. Returns the finished PDF as base64. Also callable as GET with the same fields as query parameters.

Nutrition facts for a whole recipe: give ingredients with household amounts (cups, tbsp, grams, pieces) and servings; returns calories, protein, fat, saturated fat, carbs, fiber, sugar, sodium, cholesterol and potassium per serving and in total, macro split and the USDA match for each ingredient. Also callable as GET with the same fields as query parameters.

Use when an agent needs to identify a company as a legal entity. Returns a resolution against the public legal entity identifier (LEI) registry by LEI, legal name, jurisdiction, registration ID or country, with ranked matches and auditable registry evidence. $0.01.

Agent profile hosting: publish a public profile page and an A2A agent card for your agent at agentrxi.com/agents/<name>, owned by your wallet. Update it any time. Also callable as GET with the same fields as query parameters.

Make office files: an Excel spreadsheet (or CSV) from JSON rows or CSV text, or a Word document from Markdown (headings, bullets, bold, tables). Returns the file as base64, ready to save or attach. Also callable as GET with the same fields as query parameters.

Proof of existence: anchor the SHA-256 of any text, file or URL in the Bitcoin blockchain through OpenTimestamps calendars and get the .ots proof file, so anyone can later verify the data existed at that time. Also callable as GET with the same fields as query parameters.

Edit part of an image: send the image and a mask (white = area to repaint) with a prompt, and get the edited image back. Remove objects, replace backgrounds or add items. Add store=true (+$0.001) to get a 7-day share link instead of the data inline. Also callable as GET with the same fields as query parameters.

Tool plan with cost: breaks a goal into steps and finds the cheapest paid API for each step (this marketplace and the whole x402 directory), with the estimated total cost before you spend anything.