# NanoTools > 44 pay-per-call tools for AI agents via x402 protocol. USDC on Base (eip155:8453). No API keys. ## Tools at $0.001 per call - [base64](https://nano.stacknodehost.com/api/base64): Base64 encode or decode. ?op=enc|dec&data=... Tolerant to missing padding. - [color-convert](https://nano.stacknodehost.com/api/color-convert): Convert colors between hex, rgb, hsl. ?color=#ff0000 or rgb(255,0,0) - [cron-parse](https://nano.stacknodehost.com/api/cron-parse): Explain a cron expression: next 3 run times in UTC. ?expr=*/5 * * * * - [csv2json](https://nano.stacknodehost.com/api/csv2json): Convert CSV to JSON array. ?data=&delim=, - [diff](https://nano.stacknodehost.com/api/diff): Unified diff of two texts with changed line count. ?a=&b= - [dns](https://nano.stacknodehost.com/api/dns): DNS lookup: A, AAAA, MX, TXT, NS, CNAME records for a domain. ?name=example.com&type=A - [hash-multi](https://nano.stacknodehost.com/api/hash-multi): MD5, SHA-1, SHA-256, SHA-512 in one call. ?text=... - [html-entities](https://nano.stacknodehost.com/api/html-entities): Escape or unescape HTML entities. ?op=enc|dec&data= - [json](https://nano.stacknodehost.com/api/json): Validate + pretty-print JSON. ?data={...} (urlencoded). - [jwt-decode](https://nano.stacknodehost.com/api/jwt-decode): Decode a JWT header and payload WITHOUT signature verification. ?token= - [lorem](https://nano.stacknodehost.com/api/lorem): Lorem ipsum placeholder generator. ?paras=3 or ?words=50 - [markdown2html](https://nano.stacknodehost.com/api/markdown2html): Convert Markdown to HTML (tables, fenced code). ?text= - [password](https://nano.stacknodehost.com/api/password): Secure random password. ?len=16&symbols=1 - [qr](https://nano.stacknodehost.com/api/qr): QR code generator. ?data=&size=256 -> PNG as base64 in JSON. - [random](https://nano.stacknodehost.com/api/random): Cryptographically secure random number. ?min=&max= (ints, default 0..100). - [regex](https://nano.stacknodehost.com/api/regex): Test a regex against text: matches with groups and positions. ?pattern=&text=&flags=i - [sha256](https://nano.stacknodehost.com/api/sha256): SHA-256 and SHA-512 digests for any text (?text=). Deterministic, local, stable JSON. - [slug](https://nano.stacknodehost.com/api/slug): URL slug from any text. ?text=Hello%20World -> hello-world - [text-stats](https://nano.stacknodehost.com/api/text-stats): Text statistics: words, chars, sentences, reading time. ?text=... - [timestamp](https://nano.stacknodehost.com/api/timestamp): Unix timestamp <-> ISO8601 both ways. ?ts=1690000000 or ?iso=2026-01-01T00:00:00Z - [toml2json](https://nano.stacknodehost.com/api/toml2json): Convert TOML to JSON. ?data= - [unit-convert](https://nano.stacknodehost.com/api/unit-convert): Convert units: length, weight, volume, data size, temperature. ?value=100&from=cm&to=inch - [urlcode](https://nano.stacknodehost.com/api/urlcode): URL encode/decode. ?op=enc|dec&data=... - [uuid](https://nano.stacknodehost.com/api/uuid): Generate UUIDv4 (and optional count ?n= up to 100). - [yaml2json](https://nano.stacknodehost.com/api/yaml2json): Convert YAML to JSON. ?data= ## Tools at $0.002 per call - [fx-rates](https://nano.stacknodehost.com/api/fx-rates): ECB reference currency exchange rates. ?base=USD&symbols=EUR,GBP or ?date=2026-01-15 - [ip-info](https://nano.stacknodehost.com/api/ip-info): IP geolocation and network info: country, city, ASN/org, timezone. ?ip=1.2.3.4 - [rss](https://nano.stacknodehost.com/api/rss): Parse any RSS or Atom feed into clean JSON items. ?url=&limit=10 - [search](https://nano.stacknodehost.com/api/search): Google web search. ?q=query&num=5 returns organic results with title, link, snippet. - [weather](https://nano.stacknodehost.com/api/weather): Current weather + 7-day forecast by city name or lat/lon (open-meteo, no key needed). ?city=Moscow ## Tools at $0.003 per call - [readability](https://nano.stacknodehost.com/api/readability): Text readability: Flesch score, level, avg sentence length, keyword density, top words. ?text=&keyword= - [scrape](https://nano.stacknodehost.com/api/scrape): Fetch a web page and return clean readable text. ?url=https://example.com - [whois](https://nano.stacknodehost.com/api/whois): Domain registration data via RDAP: registrar, created/updated/expires, status, nameservers. ?domain=example.com ## Tools at $0.005 per call - [robots-audit](https://nano.stacknodehost.com/api/robots-audit): Audit robots.txt + sitemap.xml of a site: rules, sitemaps listed, sitemap reachable, URL counts. ?url= - [seo-meta](https://nano.stacknodehost.com/api/seo-meta): SEO snapshot of a page: title, description, OG/Twitter meta, h1s, h2 count, canonical, robots meta, lang, word count. ?url= ## Tools at $0.010 per call - [serp-google](https://nano.stacknodehost.com/api/serp-google): Google SERP: organic results with position, ads count, related searches. ?q=&num=5&gl=us - [serp-yandex](https://nano.stacknodehost.com/api/serp-yandex): Yandex SERP for RU-market keyword research (region by ?lr=). ?q=&lr=213 ## Tools at $0.015 per call - [og-image](https://nano.stacknodehost.com/api/og-image): Generate an Open Graph image 1200x630 from title/subtitle/theme. ?title=&subtitle=&theme=indigo|dark|green|red|blue - [render-text](https://nano.stacknodehost.com/api/render-text): Render a JS-heavy page in a real browser and return the visible text. ?url= ## Tools at $0.020 per call - [pdf](https://nano.stacknodehost.com/api/pdf): Render any page to PDF (A4, print background) via headless Chrome. ?url= - [screenshot](https://nano.stacknodehost.com/api/screenshot): Real browser screenshot of any page as PNG (base64), JS rendered. ?url=&width=1280&height=800&full=0|1 - [trends](https://nano.stacknodehost.com/api/trends): Google Trends interest over time for a keyword (weekly points, peak). ?q=casino&geo=US&time=12-m|5-y - [trends-region](https://nano.stacknodehost.com/api/trends-region): Google Trends interest by region/country for a keyword. ?q=casino&geo=&time=12-m - [trends-related](https://nano.stacknodehost.com/api/trends-related): Google Trends related queries: top and rising search terms for a keyword. ?q=casino&geo=&time=12-m ## Free trial (no payment) - GET /api/sha256-free?text=... - free SHA-256/SHA-512 preview, 20 req/day per IP. Try it to see response format, then use paid tools. ## Payment Requests without payment get HTTP 402 with x402 Payment-Required header. Pay via any x402 client (PAYMENT-SIGNATURE header). Machine manifest: /.well-known/x402 OpenAPI: /openapi.json . A2A agent card: /.well-known/agent.json