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markt.halowerk.com Ethereum Gas Price Estimator
x402
markt.halowerk.com Ethereum Gas Price Estimator is a paid API for AI agents from markt.halowerk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).
Returns current Ethereum gas fee estimates including base fee, recommended bid in gwei, and USD cost, using eth_feeHistory over the last 10 blocks with 25/50/75 percentile rewards.
Price / call$0.003
Success—
StatusUnknown
How this service works
Reads eth_feeHistory over the last ten blocks with reward percentiles 25, 50 and 75, and falls back to eth_gasPrice when a node does not serve fee history. base_fee_gwei is the base fee of the next block, not of the last one, because that is the fee a transaction sent now will actually pay. recommended_gwei is a bid, not an observation: priority at the median plus a base fee doubled to survive several full blocks, and the rule is stated in recommended_rule. cost_usd converts that into dollars fo
Output
Returns base_fee_gwei (the base fee of the next block, not the last), recommended_gwei (a computed bid based on median priority fee plus doubled base fee for block survival), recommended_rule (the formula used), and cost_usd (the recommended bid converted to US dollars). Falls back to eth_gasPrice if the node does not support fee history.
Example use cases
Pre-trade gas cost check
“Before I submit this ETH swap, tell me the current recommended gas bid in gwei and how much it'll cost in dollars so I can decide if it's worth it right now.”
Automated DeFi bot gate
“Check the current Ethereum base fee and recommended gas price — if the cost in USD is under $2, go ahead and trigger my liquidity rebalance transaction.”
Gas fee monitoring alert
“What's the Ethereum base fee for the next block right now, and what's the recommended gwei bid I should use to make sure my transaction goes through within a few blocks?”
Technical details
Endpoint
POSThttps://markt.halowerk.com/gasWhen to prefer
Choose this endpoint when you need a ready-to-use recommended gas bid for Ethereum transactions, including USD cost conversion, rather than raw node data. It abstracts away EIP-1559 complexity (base fee + priority fee logic) and handles node fallback automatically. Prefer over raw RPC calls when you need a single actionable number rather than raw fee history arrays.
Side effects
- Node does not support eth_feeHistory — falls back to eth_gasPrice automatically
- RPC node unreachable or rate-limited — returns error
- Stale block data if node is behind — may produce outdated estimates
- USD conversion may lag if price feed is delayed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| chain | string | Chain to measure. ethereum or base. |
| action | string | Which transaction the cost estimate is for: transfer, erc20 or swap. |
Tags
x402
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