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Agent Margin Router – Live EIP-1559 Gas Fees
x402
Agent Margin Router – Live EIP-1559 Gas Fees is a paid API for AI agents from agent-margin-router-production.up.railway.app, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-14).
Returns live EIP-1559 gas fees (slow/standard/fast tiers) and USD transaction costs for common operation types across Base, Ethereum, Arbitrum, Optimism, and Polygon.
Price / call$0.005
Success—
StatusUnknown
How this service works
Agent Margin Router – Gas Fees: Live EIP-1559 gas fees (slow/standard/fast tiers) plus USD cost per transaction type (transfer, ERC-20 transfer, swap, NFT mint) for Base, Ethereum, Arbitrum, Optimism and Polygon. Aggregated from public RPC nodes – no API key. Pay per call with USDC or USDT on Base via x402. 3 free calls per wallet.
Output
Returns current EIP-1559 gas fee tiers (slow, standard, fast in gwei/gas price units) and estimated USD costs for common transaction types — ETH transfer, ERC-20 transfer, swap, and NFT mint — for the requested chain, sourced from live public RPC nodes.
Example use cases
DeFi swap cost check before trade
“Before I execute this swap on Arbitrum, what are the current gas fees — slow, standard, and fast — and roughly how much will the swap cost me in USD right now?”
NFT mint timing on Ethereum
“I'm about to mint an NFT on Ethereum — can you pull the live gas fees and tell me what the USD cost looks like across the slow, standard, and fast tiers so I can decide when to mint?”
Cross-chain gas cost comparison
“Can you get me the current gas fees for Base and Polygon and show me what a standard ERC-20 transfer would cost in USD on each chain?”
Technical details
Endpoint
POSThttps://agent-margin-router-production.up.railway.app/gas-fees?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need real-time, multi-tier EIP-1559 gas estimates with USD cost breakdowns for specific transaction types (transfer, swap, NFT mint) across five major EVM chains — especially useful for agents making cost-aware transaction decisions without needing an API key.
Side effects
- Unsupported chain name returns error — must be one of: base, ethereum, arbitrum, optimism, polygon
- RPC node unavailability may cause stale or missing data
- Cache age too short may result in rate limiting or slower responses
- Payment failure via x402 (insufficient USDC/USDT balance) blocks access after 3 free calls
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| chain | string | base | ethereum | arbitrum | optimism | polygon (default base). |
| max_age_seconds | integer | Max cache age (default 10). |
Tags
x402
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