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ChainScope Fee Estimator
x402
ChainScope Fee Estimator is a paid API for AI agents from chainsscope.duckdns.org, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Estimates current transaction fees (gas prices) for a specified blockchain network, returning fast, standard, and slow fee tiers in the appropriate unit.
Price / call$0.01
Success—
StatusUnknown
How this service works
Current network fee conditions -- gas price (ETH/Base/Arbitrum/Optimism/Polygon), sat/vB fee tiers (Bitcoin), or recent prioritization fees (Solana) -- useful for an agent about to construct a transaction itself.
Output
A JSON object containing fee estimates broken down into fast, standard, and slow tiers (some may be null if unavailable), the unit the fees are expressed in (e.g. 'gwei' for Ethereum), and the chain identifier confirming which network was queried.
Example use cases
Pre-transaction fee check for DeFi
“Before I submit this Ethereum swap, what are the current gas fee tiers — fast, standard, and slow — so I can pick the right one without overpaying?”
Multi-chain fee comparison for routing
“I need to send a transaction and I'm deciding between Ethereum and Base — can you pull the current fee estimates for both chains so I know which is cheaper right now?”
Automated fee monitoring for a payment bot
“My bot is about to batch-submit transactions on Ethereum — can you check the current gas price tiers and tell me if the standard fee is below 10 gwei before we proceed?”
Technical details
Endpoint
POSThttps://chainsscope.duckdns.org/tools/fee-estimateWhen to prefer
Use this endpoint when you need a consistent, multi-chain fee estimation interface across Ethereum, Base, Bitcoin, and Solana without building separate integrations for each network. Prefer it when your agent needs to make fee-aware decisions (e.g. choosing fast vs. slow tier) before submitting a transaction, or when routing transactions across chains based on current fee levels.
Side effects
- Unsupported chain identifier returns an error or null fee fields
- Network congestion or RPC downtime may return null for one or more fee tiers
- Missing or malformed chain parameter causes a 400-level error
- Fees may be stale if the underlying node data is delayed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| chain | string |
Output
Schema · Response
{
"type": "json",
"example": {
"fast": null,
"slow": null,
"unit": "gwei",
"chain": "ethereum",
"standard": "5"
}
}Tags
x402
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