Roundhouse

Apex

Vehicle specifications with citations. Every value traces to a named, redistributable public source. Versioned snapshots plus REST and MCP API.

SearchLiveeip155:8453Exactvia cdp
https://api.apex-db.org/v1/apex
AutomotiveVehiclesEmissionsSpecificationsProvenance
Calls · 30d
1→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 5 snapshots so far.
$4.50
Verified settled volume
42 settlements proven x402 by their on-chain EIP-3009 marker.
$0.100
Listed price
As published in the catalog. Always read the live 402 before paying.
1
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-07-29 07:08Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x1Ee42717b1c370dACE197a8850Bf41a932F3b5A8

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": [
    {
      "rail": "x402",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x1Ee42717b1c370dACE197a8850Bf41a932F3b5A8",
      "scheme": "exact",
      "network": "base",
      "mimeType": "application/json",
      "resource": "https://api.apex-db.org/v1/apex",
      "description": "1 search page",
      "maxAmountRequired": "100000",
      "maxTimeoutSeconds": 120
    }
  ],
  "x402Version": 1
}

Accepts

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

0.1USDC≈ $0.1 USD
on Base · exact scheme

Pay 0.1 USDC on Base to 0x1Ee4…3b5A8. The signed payment is good for 5 minutes.

Paid to
0x1Ee4…3b5A8
USD Coin contract
0x8335…02913
Payment window
5 minutes
As published
100000 smallest units
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x1Ee42717b1c370dACE197a8850Bf41a932F3b5A8",
    "amount": "100000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET",
        "queryParams": {
          "brand": "Alfa Romeo",
          "limit": 1,
          "model": "Giulia",
          "model_year": 2022
        }
      },
      "output": {
        "type": "json",
        "example": {
          "data": [
            {
              "id": 7,
              "slug": "alfa-romeo-giulia-2022-2-0l-q4-8at-awd-280-hp-130",
              "brand": "Alfa Romeo",
              "model": "Giulia",
              "power_hp": 280,
              "fuel_type": "gasoline",
              "drive_type": "AWD",
              "model_year": 2022,
              "powertrain": "ICE",
              "co2_combined_g_km": 217
            }
          ],
          "has_more": true,
          "next_cursor": "7"
        }
      }
    },
    "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": {
                "q": {
                  "type": "string",
                  "maxLength": 120,
                  "minLength": 1
                },
                "brand": {
                  "type": "string",
                  "maxLength": 80,
                  "minLength": 1
                },
                "count": {
                  "type": "boolean",
                  "description": "Include the total matching-record count."
                },
                "limit": {
                  "type": "integer",
                  "default": 20,
                  "maximum": 100,
                  "minimum": 1
                },
                "model": {
                  "type": "string",
                  "maxLength": 80,
                  "minLength": 1
                },
                "cursor": {
                  "type": "string",
                  "description": "Opaque keyset cursor from a previous response."
                },
                "market": {
                  "type": "string",
                  "maxLength": 40,
                  "minLength": 2
                },
                "model_year": {
                  "type": "integer",
                  "maximum": 2100,
                  "minimum": 1880
                },
                "powertrain": {
                  "enum": [
                    "ICE",
                    "HEV",
                    "PHEV",
                    "BEV",
                    "MHEV",
                    "REEV",
                    "FCEV"
                  ],
                  "type": "string"
                }
              },
              "additionalProperties": false
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "type": "object",
              "required": [
                "data",
                "has_more",
                "next_cursor"
              ],
              "properties": {
                "data": {
                  "type": "array",
                  "items": {
                    "type": "object",
                    "required": [
                      "id"
                    ],
                    "properties": {
                      "id": {
                        "type": "integer",
                        "minimum": 1
                      },
                      "_provenance": {
                        "type": "object",
                        "additionalProperties": true
                      }
                    },
                    "additionalProperties": true
                  }
                },
                "total": {
                  "type": "integer",
                  "minimum": 0
                },
                "has_more": {
                  "type": "boolean"
                },
                "next_cursor": {
                  "type": [
                    "string",
                    "null"
                  ]
                }
              },
              "additionalProperties": false
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-07-29 07:08Z
Last indexed by Roundhouse
2026-08-28 07:10Z
Last enriched (probe, favicon, geo)
2026-09-10 09:45Z
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. 5 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 Apex 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=Apex'
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://api.apex-db.org/v1/apex, 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.