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MycелiaSignal Cross-Chain Gas Index
x402
MycелiaSignal Cross-Chain Gas Index is a paid API for AI agents from api.myceliasignal.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-13).
Returns a cryptographically signed (Ed25519) cross-chain gas index aggregating gas price data across multiple blockchain networks.
Price / call$0.05
Success—
StatusUnknown
How this service works
Cross-chain gas index — normalized transaction cost comparison across Ethereum, Base, Arbitrum, Polygon and Solana — Ed25519 signed attestation
Output
Returns a cross-chain gas index value aggregated across multiple blockchain networks, accompanied by an Ed25519 cryptographic signature for on-chain or off-chain verification. The response enables trustless consumption of gas price benchmarks.
Example use cases
Route swaps to lowest-cost chain
“Before I execute this token swap, check the latest cross-chain gas index and tell me which blockchain would cost me the least in transaction fees right now. I want the signed attestation so I can prove the gas prices were current when I made the decision.”
Validate gas oracle data trustlessly
“We're integrating a multi-chain DeFi protocol and need to fetch the current cryptographically signed gas benchmark across all our supported networks. Can you grab the cross-chain gas index with the Ed25519 signature so our smart contract can verify it on-chain?”
Monitor gas spikes across ecosystems
“Set up monitoring for the cross-chain gas index and alert me whenever aggregated fees spike across Ethereum, Arbitrum, and Polygon. I need the signed attestations so I can audit when costs became prohibitive for our users.”
Technical details
Endpoint
GEThttps://api.myceliasignal.com/oracle/gas/indexWhen to prefer
Use this endpoint when you need a cryptographically attested, cross-chain aggregate gas index rather than gas prices for a single chain (e.g. use the sibling Polygon gas endpoint for single-chain). Prefer this when building smart contracts, DeFi protocols, or off-chain systems that require a verifiable, multi-network gas benchmark with Ed25519 signature proofs.
Side effects
- Payment not provided or invalid — 402 Payment Required
- Rate limit exceeded — service unavailable
- Oracle data temporarily unavailable — upstream data source failure
- Invalid or expired Ed25519 signature returned — attestation integrity issue
Input
{
"input": {
"type": "http",
"method": "GET",
"queryParams": {}
}
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
{
"note": "L2 costs reflect execution gas only, not L1 data posting fee. Relative ranking is accurate.",
"type": "cross_chain_gas_index",
"chains": [
{
"rank": 1,
"chain": "optimism",
"chainId": 10,
"txCostUsd": 0.000042,
"baseFeeGwei": 0,
"gasPriceGwei": 0.001,
"nativeSymbol": "ETH",
"nativePriceUsd": 2003.98
},
{
"rank": 2,
"chain": "base",
"chainId": 8453,
"txCostUsd": 0.000253,
"baseFeeGwei": 0.005,
"gasPriceGwei": 0.006,
"nativeSymbol": "ETH",
"nativePriceUsd": 2003.98
},
{
"rank": 3,
"chain": "solana",
"chainId": 0,
"txCostUsd": 0.000408,
"baseFeeGwei": 0,
"gasPriceGwei": 0,
"nativeSymbol": "SOL",
"nativePriceUsd": 81.67
},
{
"rank": 4,
"chain": "arbitrum",
"chainId": 42161,
"txCostUsd": 0.000842,
"baseFeeGwei": 0.02,
"gasPriceGwei": 0.02,
"nativeSymbol": "ETH",
"nativePriceUsd": 2003.98
},
{
"rank": 5,
"chain": "polygon",
"chainId": 137,
"txCostUsd": 0.002357,
"baseFeeGwei": 247.9474,
"gasPriceGwei": 280.5986,
"nativeSymbol": "POL",
"nativePriceUsd": 0.4
},
{
"rank": 6,
"chain": "ethereum",
"chainId": 1,
"txCostUsd": 0.006588,
"baseFeeGwei": 0.164,
"gasPriceGwei": 0.1565,
"nativeSymbol": "ETH",
"nativePriceUsd": 2003.98
}
],
"pubkey": "f4f0e52b5f7b54831f965632bf1ebf72769beda4c4e3d36a593f7729ec812615",
"cheapest": "optimism",
"canonical": "v1|GAS_INDEX|6|optimism|optimism:0.000042,base:0.000253,solana:0.000408,arbitrum:0.000842,polygon:0.002357,ethereum:0.006588|2026-05-29T04:40:06Z",
"costliest": "ethereum",
"signature": "b76b6db51871a1b572e35cab6055152320cb68c6303c6a197da3c24318b53f998673762e0c4797cc318fcbb4f4847ee2a0c56d388de563c699d1f96836b42c07",
"timestamp": "2026-05-29T04:40:06Z",
"chainCount": 6,
"signingScheme": "ed25519"
}Tags
x402
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