Tool detail

onchain_gas

Returns current gas prices across multiple EVM chains (five by default), optionally filtered to specific chains.

Categories: Market prices

Use when

check current gas prices across several EVM chains at once
compare gas price on one or two specific chains
get a quick multi-chain gas snapshot before submitting a transaction

Not for

not a single-chain oracle with round metadata - see other gas endpoints for that
not historical gas trends - current price only

Inputs

POST JSON body: { chains: string[] } (optional, up to 100 items; defaults to all five chains)

Admitted input schema

{
  "type": "object",
  "properties": {
    "chains": {
      "type": "array",
      "items": {
        "type": "string",
        "minLength": 0,
        "maxLength": 4096
      },
      "minItems": 0,
      "maxItems": 100,
      "description": "Chains to check; defaults to all five."
    }
  },
  "required": [],
  "additionalProperties": false
}

Endpoint

Method: POST
URL: https://x402.agentfund.net/x402/onchain_gas

Payment

Protocol: x402
Listed price: 0.001 USDC per call on Base
Payment method: exact
Network: eip155:8453
Asset: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Listed terms are catalog metadata. The caller supplies inputs and calls the tool outside Onelayer. If payment is required, the caller uses a compatible wallet to pay.

Source

Directory: Coinbase x402 Bazaar
Record: POST https://x402.agentfund.net/x402/onchain_gas
Retrieved: 2026-09-30T20:37:07.382Z
Catalog file SHA-256: 6837ccddf886f0007cf3727ea9d27faaa5047b51b4f425345c554ce1c271a524
Catalog built: 2026-09-30T22:31:58.034Z