NanoTools

NanoTools

44 pay-per-call APIs for AI agents via the x402 protocol. USDC on Base (eip155:8453). No API keys, no signup - pay per call from any x402 client.

For agents

• llms.txt - machine-readable catalog
• openapi.json - OpenAPI 3.1 spec with per-call prices
• A2A agent card (also at /.well-known/agent-card.json)
• x402 manifest
• MCP server: https://nano.stacknodehost.com/mcp (streamable HTTP)

Try free

/api/sha256-free?text=hello - free preview, no payment, 20 req/day per IP.

All tools (45)

• base64 - Base64 encode or decode.?op=enc|dec&data=... Tolerant to missing padding. ($0.001)
• color-convert - Convert colors between hex, rgb, hsl.?color=#ff0000 or rgb(255,0,0) ($0.001)
• cron-parse - Explain a cron expression: next 3 run times in UTC.?expr=*/5 * * * * ($0.001)
• csv2json - Convert CSV to JSON array.?data=<csv urlencoded>&delim=, ($0.001)
• diff - Unified diff of two texts with changed line count.?a=<text>&b=<text> ($0.001)
• dns - DNS lookup: A, AAAA, MX, TXT, NS, CNAME records for a domain.?name=example.com&type=A ($0.001)
• hash-multi - MD5, SHA-1, SHA-256, SHA-512 in one call.?text=... ($0.001)
• html-entities - Escape or unescape HTML entities.?op=enc|dec&data=<text> ($0.001)
• json - Validate + pretty-print JSON.?data={...} (urlencoded). ($0.001)
• jwt-decode - Decode a JWT header and payload WITHOUT signature verification.?token=<jwt> ($0.001)
• lorem - Lorem ipsum placeholder generator.?paras=3 or?words=50 ($0.001)
• markdown2html - Convert Markdown to HTML (tables, fenced code).?text=<markdown urlencoded> ($0.001)
• password - Secure random password.?len=16&symbols=1 ($0.001)
• qr - QR code generator.?data=<text>&size=256 -> PNG as base64 in JSON. ($0.001)
• random - Cryptographically secure random number.?min=&max= (ints, default 0..100). ($0.001)
• regex - Test a regex against text: matches with groups and positions.?pattern=<re>&text=<text>&fl ($0.001)
• sha256 - SHA-256 and SHA-512 digests for any text (?text=). Deterministic, local, stable JSON. ($0.001)
• slug - URL slug from any text.?text=Hello%20World -> hello-world ($0.001)
• text-stats - Text statistics: words, chars, sentences, reading time.?text=... ($0.001)
• timestamp - Unix timestamp <-> ISO8601 both ways.?ts=1690000000 or?iso=2026-01-01T00:00:00Z ($0.001)
• toml2json - Convert TOML to JSON.?data=<toml urlencoded> ($0.001)
• unit-convert - Convert units: length, weight, volume, data size, temperature.?value=100&from=cm&to=inch ($0.001)
• urlcode - URL encode/decode.?op=enc|dec&data=... ($0.001)
• uuid - Generate UUIDv4 (and optional count?n= up to 100). ($0.001)
• yaml2json - Convert YAML to JSON.?data=<yaml urlencoded> ($0.001)
• fx-rates - ECB reference currency exchange rates.?base=USD&symbols=EUR,GBP or?date=2026-01-15 ($0.002)
• ip-info - IP geolocation and network info: country, city, ASN/org, timezone.?ip=1.2.3.4 ($0.002)
• rss - Parse any RSS or Atom feed into clean JSON items.?url=<feed>&limit=10 ($0.002)
• search - Google web search.?q=query&num=5 returns organic results with title, link, snippet. ($0.002)
• weather - Current weather + 7-day forecast by city name or lat/lon (open-meteo, no key needed).?cit ($0.002)
• readability - Text readability: Flesch score, level, avg sentence length, keyword density, top words.?t ($0.003)
• scrape - Fetch a web page and return clean readable text.?url=https://example.com ($0.003)
• whois - Domain registration data via RDAP: registrar, created/updated/expires, status, nameservers ($0.003)
• robots-audit - Audit robots.txt + sitemap.xml of a site: rules, sitemaps listed, sitemap reachable, URL c ($0.005)
• seo-meta - SEO snapshot of a page: title, description, OG/Twitter meta, h1s, h2 count, canonical, rob ($0.005)
• serp-google - Google SERP: organic results with position, ads count, related searches.?q=&num=5&gl=us ($0.01)
• serp-yandex - Yandex SERP for RU-market keyword research (region by?lr=).?q=&lr=213 ($0.01)
• og-image - Generate an Open Graph image 1200x630 from title/subtitle/theme.?title=&subtitle=&theme=i ($0.015)
• render-text - Render a JS-heavy page in a real browser and return the visible text.?url= ($0.015)
• pdf - Render any page to PDF (A4, print background) via headless Chrome.?url= ($0.02)
• screenshot - Real browser screenshot of any page as PNG (base64), JS rendered.?url=&width=1280&height= ($0.02)
• trends - Google Trends interest over time for a keyword (weekly points, peak).?q=casino&geo=US&tim ($0.02)
• trends-region - Google Trends interest by region/country for a keyword.?q=casino&geo=&time=12-m ($0.02)
• trends-related - Google Trends related queries: top and rising search terms for a keyword.?q=casino&geo=&t ($0.02)
• seo-report - Full SEO audit report of a domain: health score 0-100, prioritized issues list, title/desc ($0.99)

Payment: requests without payment get HTTP 402 with an x402 PAYMENT-REQUIRED header. Facilitator: facilitator.openx402.ai.