Crypto ETF Sentinel — Single-call market snapshot for US spot crypto ETFs (Bitcoin, Ethereum, Solana, XRP and more): DB totals, filings by cryptocurrency and form type, regulatory-stage counts, and an as_of ISO timestamp. Use as a cheap heartbeat to decide whether anything changed before drilling into the catalogue.

Kelly-criterion optimal bet fraction and position sizing from a win probability and payoff, or from an edge and odds. Pure computation over your inputs.

Base gas price — Live Base mainnet gas price from JSON-RPC.

$0.003/page. Extract text from a scanned PDF (Tesseract) — make paper searchable data. 1¢ x402 min; remainder auto-credits — relaystation.ai/penny

Pharmacokinetic simulation for one compound: walks the published model at one dose and cadence and returns the modelled serum curve over the requested horizon plus a 60-day washout tail. Deterministic math over published reference data -- not medical advice, not a prescription, and for relay to a human decision-maker rather than autonomous administration.

Node network state: version, subversion, connections — flat $0.001 per call, USDC on Base, no signup.

Fetch one public HTTP(S) URL for research, extraction, or agent workflows. Returns the final URL, upstream status, content type, and decoded content. Private, local, metadata, and reserved destinations are blocked; redirects are revalidated and response size and duration are bounded.

Find 5 ranked location, address, hours, and local-context sources using place terms in the query. Not routing or Maps data.

Cited answer (RAG): a natural-language question is answered by searching the public web, reading the top pages and synthesizing a grounded answer with a list of source URLs. Answer cites only the retrieved sources (anti-hallucination).

$0.005/image. Detect protective equipment — face, hand, head covers — on people in an image. Site-safety audits by API. 1¢ x402 min; remainder auto-credits — relaystation.ai/penny

Fetch a public URL with SSRF protection and clean text extraction.

Text Moderation language: Language identification (ISO 639-1 code, name, confidence) for one text or a batch of up to 50, with a script-based fallback.

BEFORE YOU PAY Messari ($0.10–$0.25+): SKIP_MESSARI (use cheaper Pathmint/Signals), PAY_MESSARI (exact official endpoint + price), or ABORT (spoof/ghost). Two cents. Not Messari data — a gate in front of it.

Product & vehicle recall check against official U.S. databases (CPSC, FDA, NHTSA). Returns a verdict, summary and official links.

$0.005/image. Recognize celebrities in an image (Rekognition) — names with confidence scores. 1¢ x402 min; remainder auto-credits — relaystation.ai/penny

Chinese social platform hot lists (Weibo 微博, Baidu 百度, Zhihu 知乎, Toutiao 今日头条, Douyin 抖音, Bilibili 哔哩哔哩, Kuaishou 快手), ranked, public data. $0.01 USDC per call.

Octodamus — AI oracle for crypto and tokenized NYSE markets. BUY/SELL/HOLD signals, Polymarket edges, Fear & Greed, macro regime. Ed25519 signed.

Pay-per-use browser sessions with crypto. No API keys, no accounts -- just pay and connect via x402 or MPP.

Actionable Base DEX intelligence — newly created pools enriched with token metadata, stablecoin-based liquidity estimates, transparent heuristic risk flags, and a trade/watch/skip signal.

Email-authentication posture for a domain: SPF record and policy, DMARC policy and alignment, DKIM selector presence. Use it to judge whether mail claiming to be from a counterparty can be trusted. Live DNS.