Blockchain Gas Price Data services

Base gas oracle from Otto's own RPC: current base fee (wei+gwei), legacy gas price, and slow/standard/fast EIP-1559 priority-fee tiers (p25/p50/p90 over the last 20 blocks) with a ready-to-sign maxFeePerGas per tier. Unlike the crowded gas shelf it PUBLISHES the formula, so every tier is reproducible from the response. Flat JSON, refreshed every minute. Base gas oracle, gas price, priority fee, EIP-1559, maxFeePerGas. $0.001 per call.

Use when an agent needs base gas price. Returns Current Base gas price: fetch EIP-1559 latest-block base fee and gas price in wei and gwei from redundant public RPCs, with block freshness metadata for transaction planning. $0.002.

Read-only Base L2 gas conditions computed directly from chain data: current base fee, recent percentiles, realised volatility, congestion state, and an 80% forecast range for a chosen horizon. This is supporting context for timing a transaction, not a trade instruction. Every figure is reproducible from public Base RPC data.

Current gas prices on Ethereum mainnet and Base — base fee, priority fee, and EIP-1559 estimates in Gwei as JSON. No API key required. Use for: gas fee check before transacting, transaction cost estimation, L1 vs L2 fee comparison, onchain timing. $0.001 USDC per call.

Live gas market on any major EVM chain: current gas price, base fee and priority-fee percentiles (p25/p50/p75) in gwei, plus the estimated cost in native token and USD for a plain transfer (21k gas) and a typical DEX swap (200k gas). Lets an agent decide whether a transaction is worth sending right now or should wait for cheaper gas, and budget the fee before signing.

Base gas price check: the current gas price and latest block number; add ?gasLimit=150000 to also get what a transaction that size costs in ETH and USD

Current Base gas prices and a simple-transfer cost estimate for transaction planning.

Convert wei integer strings into gwei for readable gas quotes. Call when you need human-readable gas price from a wei field without an RPC call. Returns gwei float plus original wei string as deterministic JSON for $0.001 USDC via x402 on Base. First-party local math only—no RPC, live market feed, API keys, storage, or mediagen. Advisory only; the caller owns capital, risk, and production controls.

Base Gas Price Staleness: Base Gas Price Staleness checks the age of a caller-supplied gas quote before use from bounded caller-supplied values without an external provider. Call Base Gas Price Staleness before signing, submitting, replacing, or accepting an EVM/Base transaction assembled from caller-owned data. Returns normalized transaction evidence, calculated budget or shape findings, and a fail-closed preflight status for Base Gas Price Staleness as versioned deterministic JSON. Price: $0.…

Compute total gas cost in ether from used gas and price wei. Call when budgeting ETH spend for a planned or observed transaction. Returns gas cost in eth as deterministic JSON for $0.001 USDC via x402 on Base. First-party local math only—no RPC, live market feed, API keys, storage, or mediagen. Advisory only; the caller owns capital, risk, and production controls.

Estimate gas cost in USD given used gas, price, and ETH/USD. Call when operator reports that need approximate dollar gas spend. Returns usd cost estimate (caller supplies eth price) as deterministic JSON for $0.001 USDC via x402 on Base. First-party local math only—no RPC, live market feed, API keys, storage, or mediagen. Advisory only; the caller owns capital, risk, and production controls.

Check a caller-supplied Base gas price and gas limit against an ETH transaction budget with exact Wei arithmetic. Use with a gas quote supplied by the caller to fail closed before signing. Returns estimated fee, budget headroom, and an optional USD estimate for 0.001 USDC via x402 on Base or Solana; no live RPC or custody.

Sum gas + bridge fee + slippage budget into total cost. Call when comparing bridge routes with known component costs. Returns total_cost and components as deterministic JSON for $0.001 USDC via x402 on Base. First-party local math only—no RPC, live market feed, API keys, storage, or mediagen. Advisory only; the caller owns capital, risk, and production controls.

Compute gas_used × gas_price as total gas cost in wei. Call when estimating tx cost from known used gas and price without a node. Returns gas cost wei string as deterministic JSON for $0.001 USDC via x402 on Base. First-party local math only—no RPC, live market feed, API keys, storage, or mediagen. Advisory only; the caller owns capital, risk, and production controls.

Convert gas prices from gwei into wei integer strings for EVM transactions. Call when you hold gas price in gwei and need wei for eth_gasPrice-style fields or tx builders. Returns wei as a decimal integer string plus input gwei as deterministic JSON for $0.001 USDC via x402 on Base. First-party local math only—no RPC, live market feed, API keys, storage, or mediagen. Advisory only; the caller owns capital, risk, and production controls.

SYNTHORA gas-oracle-multi: gas price across 5 chains (ethereum, base, arbitrum, optimism, polygon), each VERIFIED by two independent public RPCs with divergence report — a single RPC can lie or lag; dual-verified is what you time transactions with. Free public RPCs, no key. $0.005 USDC x402 Base.

Base gas price oracle: current gas cost on Base, base fee and priority fee in gwei, at a stated block height. For agents deciding whether to transact now or wait.

Live gas conditions for an EVM chain: current gas price, the latest block's base fee (EIP-1559) and the suggested max priority fee — all in both wei and gwei. Ground truth an agent can't compute. Reads live on-chain data with automatic endpoint fallback.

Base network status and gas price: current block height and gas price (wei and gwei), live from a Base mainnet RPC node. Use it to check Base is moving, time an on-chain action or estimate gas before sending a transaction. Keyless, pay per call. No input needed.

Current Base mainnet gas price (wei/gwei), EIP-1559 base_fee_gwei/priority_fee_gwei, and gas_price_usd.

Current Base mainnet gas price (wei/gwei), EIP-1559 base_fee_gwei/priority_fee_gwei, and gas_price_usd.

Takes what the caller holds and what the seller accepts and works out which combinations can settle the amount. All costs are brought into USD, otherwise no comparison is possible: gas on the source chain plus, where needed, the cost of a swap or a bridge. Routes that require a swap or a bridge are marked explicitly - they often look cheaper on paper and are slower and riskier in practice. Every assumption is named in assumptions; nothing is folded in silently. Limits: gas costs are ORDERS OF MA

Near-real-time pump prices (EUR/L) for French gas stations from the official roulez-eco feed (data.economie.gouv.fr, updated continuously). Query: ?dept=75 (departement code) and/or ?city=Lyon, optional &fuel=gazole|sp95|sp98|e10|e85|gplc to sort cheapest-first and drop stations without that fuel, &limit=10 (1-40). Returns per station: address, lat/lon, per-fuel price with update timestamp, 24/7 automat flag. Cached 10 min.

Live Ethereum mainnet gas pricing from PublicNode RPC: next-block base fee, 25/50/75th-percentile priority tips over the last 5 blocks (slow/std/fast), and a ready-to-sign recommendation (max_fee = 2*base + tip). Query: ?speed=slow|std|fast (default std). All values are decimal gwei, no hex parsing needed. 30s cache.