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Grey Ridge Signals — Base Network Fee Estimator (x402)
x402
Grey Ridge Signals — Base Network Fee Estimator (x402) is a paid API for AI agents from x402-data-api.sigrunner.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-25).
Returns current Base network gas fee estimates (fast/standard/slow tiers) including base fee, priority fee, and ETH transfer cost, paid inline via x402 with no API key required.
Price / call$0.002
Success—
StatusUnknown
How this service works
Pay-per-call market & on-chain data for Base trading agents over x402: live DeFi yields, cross-venue funding rates, token prices, Polymarket and RPC data — plus a pre-trade token-safety gate (GO/HOLD/BLOCK). No account, no API key; agents pay inline in USDC from $0.001/call.
Output
A JSON object with the chain name ('base'), a tiers object containing fast/standard/slow max fee values in gwei, the current base fee in gwei, the current priority fee in gwei, and the estimated ETH cost for a standard transfer.
Example use cases
Gas check before on-chain swap
“Before I execute this swap on Base, what are the current fast, standard, and slow gas fee tiers in gwei? I want to make sure I'm not overpaying.”
Cost estimation for agent transaction
“My agent is about to send a batch of transactions on Base — can you pull the current fee estimates so I can calculate the ETH cost and decide whether to proceed now or wait for lower fees?”
Trading bot pre-flight fee check
“Check the current Base network gas fees for me — I need the base fee, priority fee, and estimated transfer cost in ETH before my trading bot fires off its next order.”
Technical details
Endpoint
GEThttps://x402-data-api.sigrunner.workers.dev/chain/fee-estimate?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an autonomous agent or trading bot needs real-time Base network gas fee data without an API key or account setup, especially when operating in a pay-per-call context using x402/USDC micropayments. Prefer this over Etherscan or Alchemy gas APIs when you want zero-friction, inline payment with no subscription overhead.
Side effects
- Payment not settled (402): x402 payment not included or insufficient USDC
- RPC node unavailable: upstream Base node unreachable, returns 5xx
- Stale data: fee data may lag real-time chain state by a few seconds
- Invalid or missing parameters: non-Base chains not supported
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Output
Schema · Response
{
"type": "json",
"example": {
"chain": "base",
"tiers": {
"fast": {
"max_fee_gwei": 0.02
},
"slow": {
"max_fee_gwei": 0.008
},
"standard": {
"max_fee_gwei": 0.012
}
},
"base_fee_gwei": 0.006,
"priority_fee_gwei": 0.001,
"transfer_cost_eth": {
"standard": 2.5e-7
}
}
}Tags
x402
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