Roundhouse

QuickBuild

Live gas snapshot for Base mainnet (chain 8453) read from public Base RPC: latest block number/time/utilization, base fee, eth_gasPrice, eth_maxPriorityFeePerGas, the last 10 blocks of base fees, slow/standard/fast EIP-1559 fee suggestions (10th/50th/90th percentile tips) in gwei and wei, and the estimated total cost (L2 execution + OP Stack L1 data-fee upper bound) of an ETH transfer, an ERC-20 transfer and a swap in ETH and USD (Chainlink ETH/USD on Base). No params. Cached 4 s. Errors are never charged.

TradingLiveeip155:8453Exactvia facilitator:payAI
https://quickbuild.quynguyenbac.workers.dev/api/base/gas
BaseGasCryptoOnchainEvm
Calls · 30d
2
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 7 snapshots so far.
$0.12
Verified settled volume
14 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0010
Listed price
As published in the catalog. Always read the live 402 before paying.
—
Calls · 30d
Upstream's own call count for this endpoint, not ours.
—
Unique payers · 30d
Never called
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x751a4c3841bE287544C371B4EE09Bd3366AeA7cf

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 required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x751a4c3841bE287544C371B4EE09Bd3366AeA7cf",
      "amount": "1000",
      "scheme": "exact",
      "network": "eip155:8453",
      "mimeType": "application/json",
      "resource": "https://quickbuild.quynguyenbac.workers.dev/api/base/gas",
      "description": "Live gas snapshot for Base mainnet (chain 8453) read from public Base RPC: latest block number/time/utilization, base fee, eth_gasPrice, eth_maxPriorityFeePerGas, the last 10 blocks of base fees, slow/standard/fast EIP-1559 fee suggestions (10th/50th/90th percentile tips) in gwei and wei, and the estimated total cost (L2 execution + OP Stack L1 data-fee upper bound) of an ETH transfer, an ERC-20 transfer and a swap in ETH and USD (Chainlink ETH/USD on Base). No params. Cached 4 s. Errors are never charged.",
      "outputSchema": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {},
          "discoverable": true
        },
        "output": {
          "type": "json",
          "example": {
            "ethUsd": 2433.71,
            "chainId": 8453,
            "network": "base",
            "suggested": {
              "standard": {
                "maxFeePerGasGwei": 0.011,
                "maxPriorityFeePerGasGwei": 0.001
              }
            },
            "baseFeeGwei": 0.005,
            "blockNumber": 52868139,
            "gasPriceGwei": 0.006,
            "estimatedCost": {
              "ethTransfer": {
                "eth": 1.27598e-7,
                "gas": 21000,
                "usd": 0.000311
              },
              "erc20Transfer": {
                "eth": 3.92303e-7,
                "gas": 65000,
                "usd": 0.000955
              }
            },
            "blockTimestamp": "2026-10-20T19:47:05.000Z",
            "blockUtilization": 0.0652,
            "maxPriorityFeeGwei": 0.001
          }
        }
      },
      "maxAmountRequired": "1000",
      "maxTimeoutSeconds": 300
    }
  ],
  "resource": {
    "url": "https://quickbuild.quynguyenbac.workers.dev/api/base/gas",
    "tags": [
      "base",
      "gas",
      "crypto",
      "onchain",
      "evm"
    ],
    "mimeType": "application/json",
    "description": "Live gas snapshot for Base mainnet (chain 8453) read from public Base RPC: latest block number/time/utilization, base fee, eth_gasPrice, eth_maxPriorityFeePerGas, the last 10 blocks of base fees, slow/standard/fast EIP-1559 fee suggestions (10th/50th/90th percentile tips) in gwei and wei, and the estimated total cost (L2 execution + OP Stack L1 data-fee upper bound) of an ETH transfer, an ERC-20 transfer and a swap in ETH and USD (Chainlink ETH/USD on Base). No params. Cached 4 s. Errors are never charged.",
    "serviceName": "QuickBuild"
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {}
        },
        "output": {
          "type": "json",
          "example": {
            "ethUsd": 2433.71,
            "chainId": 8453,
            "network": "base",
            "suggested": {
              "standard": {
                "maxFeePerGasGwei": 0.011,
                "maxPriorityFeePerGasGwei": 0.001
              }
            },
            "baseFeeGwei": 0.005,
            "blockNumber": 52868139,
            "gasPriceGwei": 0.006,
            "estimatedCost": {
              "ethTransfer": {
                "eth": 1.27598e-7,
                "gas": 21000,
                "usd": 0.000311
              },
              "erc20Transfer": {
                "eth": 3.92303e-7,
                "gas": 65000,
                "usd": 0.000955
              }
            },
            "blockTimestamp": "2026-10-20T19:47:05.000Z",
            "blockUtilization": 0.0652,
            "maxPriorityFeeGwei": 0.001
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "required": [],
                "properties": {}
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object",
                "properties": {
                  "ethUsd": {
                    "type": [
                      "number",
                      "null"
                    ]
                  },
                  "chainId": {
                    "type": "integer"
                  },
                  "suggested": {
                    "type": "object",
                    "description": "slow/standard/fast: maxFeePerGas + maxPriorityFeePerGas (gwei and wei)"
                  },
                  "baseFeeGwei": {
                    "type": "number"
                  },
                  "blockNumber": {
                    "type": "integer"
                  },
                  "gasPriceGwei": {
                    "type": "number"
                  },
                  "estimatedCost": {
                    "type": "object",
                    "description": "ethTransfer/erc20Transfer/swap: gas, l1DataFeeWei, totalWei, eth, usd"
                  },
                  "blockTimestamp": {
                    "type": "string"
                  },
                  "blockUtilization": {
                    "type": "number"
                  },
                  "maxPriorityFeeGwei": {
                    "type": "number"
                  }
                }
              }
            }
          }
        }
      }
    }
  },
  "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.

0.001USDC≈ $0.001 USD
on Base · exact scheme

Pay 0.001 USDC on Base to 0x751a…eA7cf. The signed payment is good for 5 minutes.

Paid to
0x751a…eA7cf
USD Coin contract
0x8335…02913
Payment window
5 minutes
As published
1000 smallest units
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x751a4c3841bE287544C371B4EE09Bd3366AeA7cf",
    "amount": "1000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET",
        "queryParams": {}
      },
      "output": {
        "type": "json",
        "example": {
          "ethUsd": 2433.71,
          "chainId": 8453,
          "network": "base",
          "suggested": {
            "standard": {
              "maxFeePerGasGwei": 0.011,
              "maxPriorityFeePerGasGwei": 0.001
            }
          },
          "baseFeeGwei": 0.005,
          "blockNumber": 52868139,
          "gasPriceGwei": 0.006,
          "estimatedCost": {
            "ethTransfer": {
              "eth": 1.27598e-7,
              "gas": 21000,
              "usd": 0.000311
            },
            "erc20Transfer": {
              "eth": 3.92303e-7,
              "gas": 65000,
              "usd": 0.000955
            }
          },
          "blockTimestamp": "2026-10-20T19:47:05.000Z",
          "blockUtilization": 0.0652,
          "maxPriorityFeeGwei": 0.001
        }
      }
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "input"
      ],
      "properties": {
        "input": {
          "type": "object",
          "required": [
            "type",
            "method"
          ],
          "properties": {
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "enum": [
                "GET"
              ],
              "type": "string"
            },
            "queryParams": {
              "type": "object",
              "required": [],
              "properties": {}
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "type": "object",
              "properties": {
                "ethUsd": {
                  "type": [
                    "number",
                    "null"
                  ]
                },
                "chainId": {
                  "type": "integer"
                },
                "suggested": {
                  "type": "object",
                  "description": "slow/standard/fast: maxFeePerGas + maxPriorityFeePerGas (gwei and wei)"
                },
                "baseFeeGwei": {
                  "type": "number"
                },
                "blockNumber": {
                  "type": "integer"
                },
                "gasPriceGwei": {
                  "type": "number"
                },
                "estimatedCost": {
                  "type": "object",
                  "description": "ethTransfer/erc20Transfer/swap: gas, l1DataFeeWei, totalWei, eth, usd"
                },
                "blockTimestamp": {
                  "type": "string"
                },
                "blockUtilization": {
                  "type": "number"
                },
                "maxPriorityFeeGwei": {
                  "type": "number"
                }
              }
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-10-21 13:31Z
Last indexed by Roundhouse
2026-10-23 22:46Z
Last enriched (probe, favicon, geo)
2026-10-21 05:45Z
x402 version
2
Max timeout
300s
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. 7 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 QuickBuild 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=QuickBuild'
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://quickbuild.quynguyenbac.workers.dev/api/base/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. Either pay over x402 (mint a personal key for $0.01 at
GET https://api.roundhouseai.io/v0/test/x402), or ask me for an organization key, which I create at
https://roundhouseai.io/dashboard/connections. If you have neither, ask before going further.

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