Crypto Microdata for Agents

Name: Crypto Microdata for Agents
Price: 0.001 USDC
Availability: InStock

Base gas oracle for agents sending Base txs: EIP-1559 slow / standard / fast tiers (maxFeePerGas + maxPriorityFeePerGas in gwei and wei hex, from eth_feeHistory 20 blocks p10/p50/p90), base fee, congestion 0-1, recommended_tier, ready-to-sign tx_fields, and est. cost in ETH + USD for your gas_limit (default 21000; use 65000 for an ERC-20 transfer). Cheapest paid call ($0.001).

TradingLiveeip155:8453Exactvia facilitator:payAI

https://kr-x402-mvp.kgy5612.workers.dev/crypto/gas

GasGas-oracleGas-priceeip-1559Fee-estimate

Settlements · 30d

162↓ 73%

No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days.

$0.46

Verified settled volume

161 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

0xe4be4d0bd82d8e68203deff81f79ede0529f2617

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": "0xe4be4d0bd82d8e68203deff81f79ede0529f2617",
      "amount": "1000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 900
    }
  ],
  "catalog": "https://kr-x402-mvp.kgy5612.workers.dev/catalog",
  "openapi": "https://kr-x402-mvp.kgy5612.workers.dev/openapi.json",
  "resource": {
    "url": "https://kr-x402-mvp.kgy5612.workers.dev/crypto/gas",
    "tags": [
      "gas",
      "gas-oracle",
      "gas-price",
      "eip-1559",
      "fee-estimate",
      "maxFeePerGas",
      "onchain",
      "evm",
      "transaction",
      "l2",
      "crypto",
      "base"
    ],
    "mimeType": "application/json",
    "description": "Base gas oracle for agents sending Base txs: EIP-1559 slow / standard / fast tiers (maxFeePerGas + maxPriorityFeePerGas in gwei and wei hex, from eth_feeHistory 20 blocks p10/p50/p90), base fee, congestion 0-1, recommended_tier, ready-to-sign tx_fields, and est. cost in ETH + USD for your gas_limit (default 21000; use 65000 for an ERC-20 transfer). Cheapest paid call ($0.001).",
    "serviceName": "Crypto Microdata for Agents"
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "gas_limit": 21000
          }
        },
        "output": {
          "type": "json",
          "example": {
            "block": 37000000,
            "chain": "base",
            "tiers": {
              "fast": {
                "est_cost_usd": 0.0007,
                "max_fee_gwei": 0.025,
                "max_priority_fee_gwei": 0.01
              },
              "slow": {
                "est_cost_usd": 0.0005,
                "max_fee_gwei": 0.006,
                "max_priority_fee_gwei": 0.001
              },
              "standard": {
                "est_cost_usd": 0.0005,
                "max_fee_gwei": 0.011,
                "max_priority_fee_gwei": 0.001
              }
            },
            "sources": [
              "https://mainnet.base.org"
            ],
            "chain_id": 8453,
            "tx_fields": {
              "gas": "0x5208",
              "type": "0x2",
              "maxFeePerGas": "0xa7d8c0",
              "maxPriorityFeePerGas": "0xf4240"
            },
            "congestion": 0.42,
            "updated_at": "2026-10-29T13:30:00Z",
            "base_fee_gwei": 0.005,
            "gas_price_gwei": 0.006,
            "recommended_tier": "standard",
            "gas_price_wei_hex": "0x5b8d80",
            "est_transfer_cost_eth": 1.26e-7,
            "max_priority_fee_gwei": 0.001,
            "max_priority_fee_wei_hex": "0xf4240"
          }
        }
      },
      "schema": {
        "type": "object",
        "$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",
                "properties": {
                  "gas_limit": {
                    "type": "integer",
                    "maximum": 30000000,
                    "minimum": 21000,
                    "examples": [
                      21000,
                      150000
                    ],
                    "description": "Gas units to price (default 21000)"
                  }
                },
                "additionalProperties": false
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    }
  },
  "how_to_pay": "Sign the accepts[0] USDC EIP-3009 authorization on Base and retry this exact URL with header PAYMENT-SIGNATURE (x402 v2). Same terms are in the PAYMENT-REQUIRED header. Failed calls (4xx/5xx) are never charged.",
  "price_usdc": "0.001000",
  "free_sample": "https://kr-x402-mvp.kgy5612.workers.dev/crypto/base-gas?sample=1",
  "x402Version": 2,
  "input_schema": {
    "type": "object",
    "properties": {
      "gas_limit": {
        "type": "integer",
        "maximum": 30000000,
        "minimum": 21000,
        "examples": [
          21000,
          150000
        ],
        "description": "Gas units to price (default 21000)"
      }
    },
    "additionalProperties": false
  },
  "cheapest_first_call": "https://kr-x402-mvp.kgy5612.workers.dev/crypto/ping ($0.001)"
}

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 0xe4be…f2617. The signed payment is good for 15 minutes.

Paid to: 0xe4be…f2617
USD Coin contract: 0x8335…02913
Payment window: 15 minutes
As published: 1000 smallest units

The catalog’s raw entry

[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0xe4be4d0bd82d8e68203deff81f79ede0529f2617",
    "amount": "1000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 900
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET",
        "queryParams": {
          "gas_limit": 21000
        }
      },
      "output": {
        "type": "json",
        "example": {
          "block": 37000000,
          "chain": "base",
          "tiers": {
            "fast": {
              "est_cost_usd": 0.0007,
              "max_fee_gwei": 0.025,
              "max_priority_fee_gwei": 0.01
            },
            "slow": {
              "est_cost_usd": 0.0005,
              "max_fee_gwei": 0.006,
              "max_priority_fee_gwei": 0.001
            },
            "standard": {
              "est_cost_usd": 0.0005,
              "max_fee_gwei": 0.011,
              "max_priority_fee_gwei": 0.001
            }
          },
          "sources": [
            "https://mainnet.base.org"
          ],
          "chain_id": 8453,
          "tx_fields": {
            "gas": "0x5208",
            "type": "0x2",
            "maxFeePerGas": "0xa7d8c0",
            "maxPriorityFeePerGas": "0xf4240"
          },
          "congestion": 0.42,
          "updated_at": "2026-10-29T13:30:00Z",
          "base_fee_gwei": 0.005,
          "gas_price_gwei": 0.006,
          "recommended_tier": "standard",
          "gas_price_wei_hex": "0x5b8d80",
          "est_transfer_cost_eth": 1.26e-7,
          "max_priority_fee_gwei": 0.001,
          "max_priority_fee_wei_hex": "0xf4240"
        }
      }
    },
    "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",
              "properties": {
                "gas_limit": {
                  "type": "integer",
                  "maximum": 30000000,
                  "minimum": 21000,
                  "examples": [
                    21000,
                    150000
                  ],
                  "description": "Gas units to price (default 21000)"
                }
              },
              "additionalProperties": false
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "type": "object"
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog: 2026-10-30 12:21Z
Last indexed by Roundhouse: 2026-11-11 12:15Z
Last enriched (probe, favicon, geo): 2026-11-01 00:46Z
x402 version: 2
Max timeout: 900s
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

No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days. 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 Crypto Microdata for Agents 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=Crypto%20Microdata%20for%20Agents'
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://kr-x402-mvp.kgy5612.workers.dev/crypto/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.