Roundhouse

EVM Gas Price

Keyronne — things I

TradingLiveeip155:8453Exactvia cdp
https://keyronne.com/api/chain-gas
BlockchainGasFeesEvmeip1559
Calls · 30d
2↓ 46%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 30 snapshots so far.
$2.52
Verified settled volume
915 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0030
Listed price
As published in the catalog. Always read the live 402 before paying.
2
Calls · 30d
Upstream's own call count for this endpoint, not ours.
2
Unique payers · 30d
Last called 2026-09-08 08:25Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0xB86F95EF5FA904318Ea9Df3b59AdCe099b478fC4

The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.

Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Provider

The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.

Live 402 challenge

Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.

{
  "error": "PAYMENT-SIGNATURE header is required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xB86F95EF5FA904318Ea9Df3b59AdCe099b478fC4",
      "amount": "3000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 60
    }
  ],
  "resource": {
    "url": "https://keyronne.com/api/chain-gas",
    "tags": [
      "blockchain",
      "gas",
      "fees",
      "evm",
      "eip1559"
    ],
    "mimeType": "application/json",
    "description": "Current gas price and EIP-1559 fee suggestions (base fee, priority tip, suggested max fee) on Ethereum, Base, Arbitrum, Optimism, Polygon, or BNB Chain, in gwei. Public JSON-RPC, no API keys. POST a JSON body like: {\"chain\":\"ethereum\"}",
    "serviceName": "EVM Gas Price"
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "body": {
            "chain": "ethereum"
          },
          "type": "http",
          "method": "POST",
          "bodyType": "json"
        },
        "output": {
          "type": "json",
          "example": {
            "chain": "ethereum",
            "baseFeeGwei": "11.8",
            "blockNumber": 20500000,
            "gasPriceGwei": "12.4",
            "priorityFeeGwei": "0.5",
            "suggestedMaxFeeGwei": "24.1",
            "suggestedPriorityFeeGwei": "0.5"
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "properties": {
              "body": {
                "type": "object",
                "required": [
                  "chain"
                ],
                "properties": {
                  "chain": {
                    "enum": [
                      "ethereum",
                      "base",
                      "arbitrum",
                      "optimism",
                      "polygon",
                      "bsc"
                    ],
                    "type": "string"
                  }
                }
              },
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "POST"
                ],
                "type": "string"
              },
              "bodyType": {
                "enum": [
                  "json"
                ],
                "type": "string"
              }
            }
          },
          "output": {
            "type": "object",
            "properties": {
              "chain": {
                "type": "string"
              },
              "baseFeeGwei": {
                "type": "string"
              },
              "gasPriceGwei": {
                "type": "string"
              },
              "priorityFeeGwei": {
                "type": "string"
              },
              "suggestedMaxFeeGwei": {
                "type": "string"
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2
}

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.

0.003USDC≈ $0.003 USD
on Base · exact scheme

Pay 0.003 USDC on Base to 0xB86F…78fC4. The signed payment is good for 1 minute.

Paid to
0xB86F…78fC4
USD Coin contract
0x8335…02913
Payment window
1 minute
As published
3000 smallest units
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0xB86F95EF5FA904318Ea9Df3b59AdCe099b478fC4",
    "amount": "3000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 60
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "chain": "ethereum"
        },
        "type": "http",
        "method": "POST",
        "bodyType": "json"
      },
      "output": {
        "type": "json",
        "example": {
          "chain": "ethereum",
          "baseFeeGwei": "11.8",
          "blockNumber": 20500000,
          "gasPriceGwei": "12.4",
          "priorityFeeGwei": "0.5",
          "suggestedMaxFeeGwei": "24.1",
          "suggestedPriorityFeeGwei": "0.5"
        }
      }
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "input"
      ],
      "properties": {
        "input": {
          "type": "object",
          "properties": {
            "body": {
              "type": "object",
              "required": [
                "chain"
              ],
              "properties": {
                "chain": {
                  "enum": [
                    "ethereum",
                    "base",
                    "arbitrum",
                    "optimism",
                    "polygon",
                    "bsc"
                  ],
                  "type": "string"
                }
              }
            },
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "enum": [
                "POST"
              ],
              "type": "string"
            },
            "bodyType": {
              "enum": [
                "json"
              ],
              "type": "string"
            }
          }
        },
        "output": {
          "type": "object",
          "properties": {
            "chain": {
              "type": "string"
            },
            "baseFeeGwei": {
              "type": "string"
            },
            "gasPriceGwei": {
              "type": "string"
            },
            "priorityFeeGwei": {
              "type": "string"
            },
            "suggestedMaxFeeGwei": {
              "type": "string"
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-09-08 08:25Z
Last indexed by Roundhouse
2026-09-24 10:40Z
Last enriched (probe, favicon, geo)
2026-09-14 10:45Z
x402 version
2
Max timeout
60s
Liveness probe
HTTP 402
Report

Hand this page to an agent

Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.

GET api.roundhouseai.io/v0/endpoints

This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 30 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.

Open skill.md
Show the prompt
Using Roundhouse, look up the x402 service EVM Gas Price and tell me whether it is
worth paying: what a call costs, whether the endpoint answered when last probed, and what
its payment record actually shows.

curl -s 'https://api.roundhouseai.io/v0/endpoints?q=EVM%20Gas%20Price'
curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>'

Then call it: read the price from the live 402 at https://keyronne.com/api/chain-gas, never from
a cached figure, and pay with an x402 client.

The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except
/v0/unified* and /v0/endpoints. Mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402,
or use an organization key from https://roundhouseai.io/dashboard/team.

If you do not have Roundhouse tools or skills installed, read
https://roundhouseai.io/skill.md first — it is the whole procedure.