# GET /gas: $0.002 per call

Live network fees on Ethereum, Base, Arbitrum, Optimism, Polygon, BNB, Avalanche, Solana and Bitcoin: slow/standard/fast fee rates, congestion and trend, and the USD cost of a send, token transfer and swap on each, plus the cheapest chain now. Optional ?chains=base,solana.

- **Price:** $0.002 in USDC, the same on Base, Solana, Polygon, Arbitrum. Failed calls are never charged.
- **Free trial:** yes, 20 free calls a day from Claude, Cursor or any MCP client ([set-up](/mcp/setup)).
- **Answers cached for:** 15 s
- **Data sources:** Public RPC nodes (free); mempool.space (free); DexScreener (free); DefiLlama prices (free, fallback)
- **Lane:** Crypto & on-chain ([OpenAPI](/openapi/crypto.json))
- **Live health:** [status page](/status)

## Free sample

See an answer for the demo input first, free (no payment, 10 a minute): [https://aayatai.com/sample/gas](/sample/gas). It is a stored real answer when we have one, otherwise an example marked `"kind": "illustrative"`.

```bash
curl "https://aayatai.com/sample/gas"
```

## 1. See the price (free)

Call it without paying: you get `402 Payment Required` and a `PAYMENT-REQUIRED` header with the exact price and where to pay.

```bash
curl -i "https://aayatai.com/gas?chains=base%2Cethereum%2Csolana"
```

## 2. Pay and call (TypeScript)

```bash
npm install @x402/fetch @x402/evm viem
```

```ts
import { wrapFetchWithPaymentFromConfig } from "@x402/fetch";
import { ExactEvmScheme } from "@x402/evm";
import { privateKeyToAccount } from "viem/accounts";

// A wallet used only by your agent, holding a little USDC on Base.
const account = privateKeyToAccount(process.env.WALLET_PRIVATE_KEY as `0x${string}`);
const pay = wrapFetchWithPaymentFromConfig(fetch, {
  schemes: [{ network: "eip155:8453", client: new ExactEvmScheme(account) }],
});

const res = await pay("https://aayatai.com/gas?chains=base%2Cethereum%2Csolana");
console.log(await res.json());
```

## 3. Or as an MCP tool

```ts
// MCP server: https://aayatai.com/mcp (Streamable HTTP). With the x402 MCP client (see /start):
const result = await client.callTool("gas", {"chains":"base,ethereum,solana"});
```

## Inputs

- `chains` (string): Comma-separated chains (default all): ethereum, base, arbitrum, optimism, polygon, bsc, avalanche, solana, bitcoin.

Bad inputs are rejected with HTTP 400 before any payment is asked for.

## Example answer

```json
{
  "chains": [
    {
      "chain": "base",
      "symbol": "ETH",
      "nativeUsd": 2650,
      "unit": "gwei",
      "baseFee": 0.005,
      "gasPrice": 0.006,
      "speeds": {
        "slow": 0.0051,
        "standard": 0.0061,
        "fast": 0.0072
      },
      "congestion": "low",
      "trend": "steady",
      "costs": {
        "transfer": {
          "native": 1.28e-7,
          "usd": 0.00034
        },
        "tokenTransfer": {
          "native": 3.97e-7,
          "usd": 0.00105
        },
        "swap": {
          "native": 0.0000011,
          "usd": 0.0029
        }
      },
      "note": "Layer-2 costs exclude the small L1 data fee."
    }
  ],
  "cheapest": {
    "swap": {
      "chain": "base",
      "usd": 0.0029
    },
    "transfer": {
      "chain": "base",
      "usd": 0.00034
    }
  },
  "unavailable": [],
  "source": "Public RPC nodes, mempool.space, DexScreener prices",
  "checkedAt": "2026-09-28T12:00:00.000Z"
}
```

## Related

- [GET /token/price](/services/token-price) ($0.005): Live price of any token on Base, Solana, Ethereum, BNB, Arbitrum, Polygon, Optimism or Avalanche from DEX data: USD price, total liquidity, 24h volume, buys/sel
- [GET /token/safety](/services/token-safety) ($0.02): Rug-pull and scam check for any token on Base, Solana, Ethereum, BNB, Arbitrum, Polygon, Optimism or Avalanche.
- [GET /token/report/cached](/services/token-report-cached) ($0.05): Full token report, cached tier (answers up to 15 minutes old, half price): safety (honeypot, taxes, owner powers), holders (concentration, exchange/fund/locked 
- [GET /token/report](/services/token-report) ($0.10): Full token report, live: safety (honeypot, taxes, owner powers), holders (concentration, exchange/fund/locked share), liquidity (depth, locks, pools), price act
- [GET /token/report/deep](/services/token-report-deep) ($0.25): Deep token report: everything in /token/report (safety (honeypot, taxes, owner powers), holders (concentration, exchange/fund/locked share), liquidity (depth, l
- [GET /token/new](/services/token-new) ($0.01): New token launches with real liquidity: tokens whose first DEX pool opened in the last hour (up to 24h) with at least $10k liquidity (adjustable), newest first,
- [GET /token/whales](/services/token-whales) ($0.02): Whale and exchange flows for a token on Base, Ethereum, Arbitrum, Optimism or Polygon, from its latest ~250 transfers: large transfers, deposits/withdrawals per
- [GET /wallet](/services/wallet) ($0.01): Wallet profile on Base, Ethereum or Solana: native balance, token holdings with USD values (top 25), total portfolio value, whether it is a contract, ENS name, 

New here? [Getting started in 60 seconds](/start). All services: [Aayat AI](/).