$ man gas-price
/gas-price(1)
PRICE / CALL
$0.02
USDC · base mainnet · scheme: exact
METHOD
POST
CLUSTER
edgemarketCATEGORY
uncategorized
STATUS
● live
NAME
gas-price — gas price api / eip-1559 fee estimator / base + ethereum + optimism + arbitrum gas tracker / pre-tx cost estimator
synonym alias of gas-now-base — reuses the canonical handler.
SYNOPSIS
POST https://x402.org/v1/gas-price
Content-Type: application/json
X-PAYMENT: <signed-transferWithAuthorization>
{ ... }↳ first call →
402 Payment Required. Sign USDCtransferWithAuthorization, retry with theX-PAYMENT header.DESCRIPTION
Gas price API / EIP-1559 fee estimator / Base + Ethereum + Optimism + Arbitrum gas tracker / pre-tx cost estimator. Reads the chain's latest block, derives base fee, suggests priority fees for safe-low/standard/fast tiers, computes total maxFeePerGas, and converts cost to USD for common tx types.
INPUT — request schema
| property | type | description | req? |
|---|---|---|---|
| chain | string | EVM L1/L2 to read gas from. Default 'base'. enum: base · ethereum · optimism · arbitrum · polygon | optional |
OUTPUT — response shape
| field | type | description |
|---|---|---|
| chain | string | Chain name queried (e.g. base, ethereum, optimism, arbitrum). |
| base_fee_gwei | string | Latest block's base fee per gas in gwei, derived from EIP-1559. |
| priority_fee_gwei | string | Suggested miner tip in gwei for the requested speed tier. |
| total_recommended_gwei | string | Recommended maxFeePerGas in gwei (base fee plus priority fee). |
| block_number | string | Block height the base fee was read from. |
| eth_price_usd | string | ETH spot price in USD used to convert gas cost. |
| cost_usd | string | Estimated total tx cost in USD for a common transaction type. |
| timestamp | string | ISO-8601 UTC time the gas reading was taken. |
EXAMPLES — two ways to call
EXAMPLE 1 · curl
curl -X POST https://x402.org/v1/gas-price \
-H 'Content-Type: application/json' \
-d '{ }'first response =
402 Payment Required with payment requirements; sign + retry with X-PAYMENT.EXAMPLE 2 · mcp
# install once claude mcp add x402 --command "npx x402-deployer-mcp" # then ask Claude Code: # "use the gas-price tool to ..."
MCP server handles payment automatically — your coding agent just calls the tool by name.
METADATA
- tags
- edge-marketgas-priceeip-1559fee-estimatorbase-feepriority-feegas-tracker
- methods
- POST
- cluster
- edgemarket
- price
- $0.02 USDC per call
ADJACENT — other endpoints in edgemarket
| endpoint | description | price |
|---|---|---|
| defi-llama-protocol | DefiLlama protocol lookup — TVL, chain breakdown, current TVL, 24h/7d/30d changes, audits, parent protocol, categories. | $0.02 |
| gas-now-base | Gas oracle / EIP-1559 fee estimator. | $0.02 |
| token-price | Crypto token price API / CoinGecko wrapper. | $0.02 |
| tx-receipt-decode | EVM transaction receipt decoder / log decoder / event log reader / Etherscan tx debug / receipt parser / Basescan tx explainer / tenderly… | $0.02 |
| tx-simulate-swap | Tx simulate swap / pre-trade quote / DEX swap simulator / 1inch + LlamaSwap quote / would-it-succeed check. | $0.02 |
| bridge-rates | Cross-chain bridge rate aggregator. | $0.03 |
| dao-proposal-monitor | Snapshot.org DAO proposal monitor. | $0.03 |
| ens-resolve | ENS resolver / Ethereum Name Service lookup. | $0.03 |
SEE ALSO