{"protocolVersion":"0.3.0","name":"NythosX Agent Tools","description":"Pay-per-call tools for autonomous agents: current gas and fee prices across six chains (Base, Ethereum, Arbitrum, Optimism, Polygon, Solana) and web page to clean Markdown. Paid in USDC via x402 v2 on Base (Solana optional). This A2A endpoint answers free questions: supported chains, current Base gas, and the paid catalog.","url":"https://tools.nythosx.com/a2a","preferredTransport":"JSONRPC","version":"1.0.0","iconUrl":"https://tools.nythosx.com/favicon.svg","documentationUrl":"https://tools.nythosx.com/","provider":{"organization":"NythosX","url":"https://tools.nythosx.com"},"capabilities":{"streaming":false,"pushNotifications":false},"payment":{"protocol":"x402","asset":"USDC","networks":["eip155:8453"],"catalog":"https://tools.nythosx.com/api/catalog","mcp":"https://tools.nythosx.com/mcp"},"defaultInputModes":["text/plain","application/json"],"defaultOutputModes":["application/json","text/plain"],"skills":[{"id":"chains","name":"Supported chains (free)","description":"List supported chains and gas-unit constants. Ask: 'chains' or 'what chains do you support'.","tags":["free","chains"],"examples":["chains","what chains do you support"]},{"id":"gas-base","name":"Current Base gas (free)","description":"Live gas and fee tiers for Base, cached 30 s at the edge. Ask: 'gas base' or 'base gas now'.","tags":["free","gas","base"],"examples":["gas base","base gas now"]},{"id":"gas","name":"Current gas and fee prices for one chain","description":"Current gas and fee prices for Base, Ethereum, Arbitrum, Optimism, Polygon or Solana: slow/standard/fast tiers and the USD cost of a transfer, USDC transfer and swap. Updated every 15 seconds. Paid via x402: the first call returns 402 with payment requirements; retry with a PAYMENT-SIGNATURE header (or, over MCP, with payment in _meta[\"x402/payment\"]) to get the 200 response — failed/unpaid calls are never charged. Paid: $0.002 USDC via x402 at GET https://tools.nythosx.com/v1/gas.","tags":["x402","paid"],"examples":["GET https://tools.nythosx.com/v1/gas?chain=base"]},{"id":"compare","name":"Where is it cheapest to send this transaction right now?","description":"Ranks all 6 supported chains (Base, Ethereum, Arbitrum, Optimism, Polygon, Solana) by USD cost for a transaction type (transfer, USDC transfer or swap) at a speed tier (slow/standard/fast). Returns the ranking, the cheapest chain, and any chains queried in parallel that didn't respond (in failed[]). Paid: $0.005 USDC via x402 at GET https://tools.nythosx.com/v1/gas/compare.","tags":["x402","paid"],"examples":["GET https://tools.nythosx.com/v1/gas/compare?tx=usdc_transfer&tier=standard"]},{"id":"read","name":"Convert any web page into clean, readable Markdown","description":"Fetches a public web page and returns clean Markdown: title, byline, site name, excerpt, word count and article body. Respects robots.txt, blocks private hosts, follows up to five redirects, caps the page at 3 MB. links=true adds outbound links. Not charged on failure: 403 if robots.txt disallows the path, 415 for non-HTML, 422 if no article text extracts, 502 on upstream error. Paid: $0.003 USDC via x402 at GET https://tools.nythosx.com/v1/read.","tags":["x402","paid"],"examples":["GET https://tools.nythosx.com/v1/read?url=https%3A%2F%2Fexample.com&links=false"]}]}