api.x402node.dev
GET https://api.x402node.dev/chain/gas-estimate
Estimates the USD gas cost of a common action (transfer, erc20-transfer, approve, swap, nft-mint) across EVM chains, combining live gas price per chain with the native token price. Lets an agent pick the cheapest chain to execute and budget a transaction. Live aggregated gas + price compute. gas cost estimate, transaction fee usd, cheapest chain to execute, swap gas Accepts payment on Base or Solana — either network works.
Warnings
Unusual seller traffic This seller's paid usage looks manufactured: paid calls to trivial endpoints like ping or uuid, or near-identical payer counts on every endpoint. Its usage counts half.
How to buy
This endpoint takes pay-per-call payments over x402. Call it once without paying to see its live price; any x402 client then pays and retries automatically.
curl -i -X GET "https://api.x402node.dev/chain/gas-estimate"
# HTTP/1.1 402 Payment Required: price, asset and payTo are in the responseRecent checks
| Checked (UTC) | Result | Status | Time | Live price |
|---|---|---|---|---|
| 2026-10-11 08:00 | Valid 402 | 402 | 49 ms | $0.012 |
| 2026-10-11 03:30 | Valid 402 | 402 | 48 ms | $0.012 |
| 2026-10-10 23:15 | Valid 402 | 402 | 266 ms | $0.012 |
| 2026-10-10 17:45 | Valid 402 | 402 | 276 ms | $0.012 |
Receipts
No test purchases yet. Graded test purchases are next on our list; until then every number here comes from unpaid checks.
What a check proves