# NythosX Agent Tools
> Pay-per-call tools for autonomous agents: current gas and fee prices across six chains, and web page to clean Markdown. Paid in USDC via x402 v2.

## Endpoints
- GET /v1/gas?chain=base - $0.002 USDC. Gas tiers (slow, standard, fast) and USD cost of a transfer, USDC transfer or swap.
- GET /v1/gas/compare?tx=usdc_transfer&tier=standard - $0.005 USDC. Cheapest chain for this transaction right now.
- GET /v1/read?url=https://example.com - $0.003 USDC. Clean Markdown from any public web page.
- GET /v1/chains - free. Supported chains and gas units.
- GET /v1/sample?endpoint=gas|compare|read - free. Fixed-input samples.

## Payment
x402 v2, USDC, Base mainnet (eip155:8453). Solana optional. Call a paid endpoint without payment to receive a 402 with PAYMENT-REQUIRED; retry with PAYMENT-SIGNATURE. Failed calls are never charged.

## MCP
https://tools.nythosx.com/mcp - Streamable HTTP, stateless. Tools: get_gas_price, compare_gas_costs, read_url_as_markdown, list_chains.

## Machine files
- /openapi.json
- /api/catalog
- /.well-known/x402
- /.well-known/agent-card.json