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EVM Gas Fee Snapshot API
x402
EVM Gas Fee Snapshot API is a paid API for AI agents from evm-gas.apitoll.cloud, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Returns real-time EIP-1559 gas fee tiers (slow/standard/fast), current base fee, latest block, and median block fullness for 17 EVM-compatible chains via direct RPC eth_feeHistory sampling.
Price / call$0.001
Success—
StatusUnknown
How this service works
Multi-chain EVM gas price oracle for AI agents — 17 chains (Ethereum, Base, Arbitrum, Optimism, Polygon, BNB, Avalanche…). One x402 call returns slow/standard/fast EIP-1559 tiers as DROP-IN maxFeePerGas + maxPriorityFeePerGas in wei (plug straight into a viem/ethers tx, no conversion, exact even on sub-gwei L2s), plus base fee, head block, and fullness, from a live eth_feeHistory call. Pass ?chain= to switch chains.
Output
Returns a JSON object with the chain name, CAIP-2 identifier, current base fee in gwei, latest block number, gas model type (eip1559/mostly-legacy/non-standard), slow/standard/fast priority fee tiers (p10/p50/p90), median block fullness percentage, number of blocks sampled, and a human-readable gas note with a timestamp.
Example use cases
Example prompt
“What are the slow, standard, and fast gas fee tiers on Arbitrum right now — sample the last 10 blocks?”
Technical details
Endpoint
GEThttps://evm-gas.apitoll.cloud/v1/evm/gasWhen to prefer
Choose this endpoint when you need real-time, multi-tier EIP-1559 gas fee data across any of 17 EVM chains with a single lightweight GET call. Ideal for AI agents doing cross-chain transaction scheduling, fee estimation before submitting a transaction, or monitoring network congestion. Prefer over on-chain RPC calls when you don't maintain your own node infrastructure or need pre-computed percentile tiers.
Side effects
- Invalid or unsupported chain name returns 400 with validation error
- blocks parameter out of range (>50 or <1) is clamped or rejected
- RPC node unavailable for a specific chain may return 503 or timeout
- Payment not provided or invalid x402 token returns 402 Payment Required
- Malformed query parameters return schema validation error
Input
{
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"chain": "ethereum",
"blocks": 5
}
}
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
{
"caip2": "eip155:1",
"chain": "ethereum",
"stats": {
"ts": "2026-06-10T04:34:07.424Z",
"blocks_sampled": 5,
"median_fullness_pct": 54.03
},
"tiers": {
"fast": {
"max_fee_gwei": 0.2895,
"max_priority_gwei": 0.1
},
"slow": {
"max_fee_gwei": 0.1899,
"max_priority_gwei": 0.0004
},
"standard": {
"max_fee_gwei": 0.1906,
"max_priority_gwei": 0.0011
}
},
"gas_model": "eip1559",
"chain_name": "Ethereum mainnet",
"block_number": 25284684,
"base_fee_gwei": 0.1263
}Schema · Response
{
"type": "json",
"example": {
"caip2": "eip155:1",
"chain": "ethereum",
"stats": {
"ts": "2026-05-28T15:42:30.000Z",
"blocks_sampled": 20,
"median_fullness_pct": 45.5
},
"tiers": {
"fast": {
"maxFeePerGas": "14831000000",
"max_fee_gwei": 14.831,
"max_priority_gwei": 2.2,
"maxPriorityFeePerGas": "2200000000"
},
"slow": {
"maxFeePerGas": "12631000000",
"max_fee_gwei": 12.631,
"max_priority_gwei": 0.001,
"maxPriorityFeePerGas": "1000000"
},
"standard": {
"maxFeePerGas": "13731000000",
"max_fee_gwei": 13.731,
"max_priority_gwei": 1.1,
"maxPriorityFeePerGas": "1100000000"
}
},
"gas_model": "eip1559",
"chain_name": "Ethereum mainnet",
"base_fee_wei": "8421000000",
"block_number": 21403217,
"base_fee_gwei": 8.421
}
}Tags
x402
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