NythosX Agent Tools

{
  "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/fee tiers and USD costs for one chain",
      "description": "Slow/standard/fast gas tiers and USD cost of a transfer, USDC transfer and swap, for Base, Ethereum, Arbitrum, Optimism, Polygon or Solana. Updated every 15s. Solana is compute-unit pricing, not gwei-style gas; the other 5 are EVM. Use for one chain's prices; use compare_gas_costs to rank all 6, or estimate_custom_tx_cost for a gas limit/compute budget outside the 3 canned tx types here. x402: 402 first, retry with PAYMENT-SIGNATURE (MCP: _meta[\"x402/payment\"]) \u2014 unpaid/failed 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": "estimate",
      "name": "USD cost of a custom gas limit or compute-unit budget",
      "description": "Prices an arbitrary transaction, not just the 3 canned types get_gas_price/compare_gas_costs cover: pass your own gas limit (EVM chains) or compute-unit budget (Solana) and get its USD cost at a speed tier. Use this for a contract call, NFT mint or any tx whose gas usage you already know or estimated via eth_estimateGas/simulation \u2014 get_gas_price's 3 canned tx types won't fit it. Typical EVM units: 21,000 plain transfer, 50,000-65,000 ERC20 transfer, 100,000-250,000 typical contract call/NFT mint, 150,000-400,000 DEX swap; typical Solana compute units: 200,000 simple transfer, up to 1,400,000 (the per-tx cap) for a complex instruction. Excludes OP-stack L1 data fee (depends on calldata size, not gas limit) \u2014 add a few % for Base/Optimism to be safe. Paid: $0.002 USDC via x402 at GET https://tools.nythosx.com/v1/gas/estimate.",
      "tags": [
        "x402",
        "paid"
      ],
      "examples": [
        "GET https://tools.nythosx.com/v1/gas/estimate?chain=base&units=150000&tier=standard"
      ]
    },
    {
      "id": "price",
      "name": "USD price of a chain's native token, no gas data",
      "description": "Just the native-token USD price (ETH, POL or SOL), sourced from MEXC/Gate.io/Coinbase with the same price feed get_gas_price uses. Use this when you only need the asset price, not fees \u2014 get_gas_price and compare_gas_costs already return nativeUsd alongside gas data, so call this instead only to skip the gas lookup (e.g. valuing a wallet balance, not estimating a transaction). Paid: $0.001 USDC via x402 at GET https://tools.nythosx.com/v1/price.",
      "tags": [
        "x402",
        "paid"
      ],
      "examples": [
        "GET https://tools.nythosx.com/v1/price?chain=base"
      ]
    },
    {
      "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"
      ]
    },
    {
      "id": "status",
      "name": "Check if a URL is reachable before paying to read it",
      "description": "HEAD request following up to five redirects: status code, final URL, content-type, content-length and last-modified \u2014 no page body fetched or charged for content. Use before read_url_as_markdown ($0.003) to confirm a URL resolves and is HTML before paying the bigger fee for extraction. Doesn't check robots.txt (that's enforced on the actual read). Some servers reject HEAD (405/403) even though GET works, so a non-2xx here doesn't guarantee read_url_as_markdown will also fail. Paid: $0.001 USDC via x402 at GET https://tools.nythosx.com/v1/read/status.",
      "tags": [
        "x402",
        "paid"
      ],
      "examples": [
        "GET https://tools.nythosx.com/v1/read/status?url=https%3A%2F%2Fexample.com"
      ]
    }
  ]
}