Gas & Fee Tracker

“Ethereum gas fees now”, “how much does a swap cost on Base”, “cheapest chain to deploy a smart contract” — gas questions are among the most repeated searches in crypto, and the answers change every block. The Gas & Fee Tracker runs inside ChatGPT and answers them live for the five chains TokenOS builds on: Ethereum, Base, Arbitrum One, Robinhood Chain and Solana. Free, read-only, no account.

gas_now returns every chain side by side: the next base fee, slow / standard / fast priority tiers, the USD cost of a plain transfer, an ERC-20 transfer, a swap, an NFT mint and a contract deployment at the chosen speed, the fee trend over recent blocks or Solana congestion, and which chain is cheapest at this moment — rendered as an inline table with the cheapest row highlighted. estimate_tx_cost prices a single transaction on one chain by type or by explicit gas or compute units, with the suggested maxFee for EVM chains and the base-fee-plus-priority breakdown for Solana. cheapest_chain_to_deploy ranks the chains by the cost of deploying a contract or program of a given bytecode size — EVM gas spent versus Solana's refundable rent deposit — and flags contracts above the 24 KB EIP-170 limit.

Data comes from public JSON-RPC endpoints (eth_feeHistory over the last 20 blocks and eth_gasPrice) and, for Solana, recent prioritization fees sampled from slots touching Jupiter, Raydium, Pump.fun and the Token program; ETH and SOL prices come from Jupiter with a CoinGecko fallback. Results are cached for fifteen seconds and every chain is fetched independently, so one slow RPC never blanks the table. Layer-2 costs show execution gas and tell you to add the small L1 data fee, which depends on calldata size and Ethereum gas at the moment.

The tracker is the natural first step before a deployment or a token launch: pick the chain, then open the TokenOS IDE — every result links to it — to deploy to a testnet and mainnet with your own wallet. Figures are informational estimates based on typical gas and compute units; actual costs depend on the transaction. Try it live below, copy a starter prompt, or add the MCP endpoint to Claude Desktop or Cursor.

• Live fees on Ethereum, Base, Arbitrum, Robinhood Chain and Solana with slow / standard / fast tiers
• USD cost per transfer, ERC-20 transfer, swap, NFT mint and contract deployment
• Cheapest chain to deploy for any bytecode size — EVM gas vs Solana rent
• Public RPC data, 15-second cache, free and read-only