Roundhouse

nbx4

Analyze a Base Mainnet token contract: block-pinned owner(), ERC-1967 proxy slots, ERC-20 metadata, code hash, best-effort source match and prior-snapshot comparison when available. Free POST /v1/prepare returns report_id; paid GET /v1/report reads it for 0.01 USDC via x402. Not a security audit.

DataLiveeip155:8453Exactvia cdp
https://nbx4.dev/v1/report
BaseSmart-contractToken-metadataProxyOwnership
Calls · 30d
6
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 8 snapshots so far.
$0.16
Verified settled volume
12 settlements proven x402 by their on-chain EIP-3009 marker.
$0.010
Listed price
As published in the catalog. Always read the live 402 before paying.
6
Calls · 30d
Upstream's own call count for this endpoint, not ours.
4
Unique payers · 30d
Last called 2026-10-24 20:32Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x15dBEC18A30457013c6a436FF25F607eF834c46C

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.

Accepts

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

0.01USDC≈ $0.01 USD
on Base · exact scheme

Pay 0.01 USDC on Base to 0x15dB…4c46C. The signed payment is good for 5 minutes.

Paid to
0x15dB…4c46C
USD Coin contract
0x8335…02913
Payment window
5 minutes
As published
10000 smallest units
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x15dBEC18A30457013c6a436FF25F607eF834c46C",
    "amount": "10000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET",
        "queryParams": {
          "report_id": "nbx4_ad470a5aab2b590648729ab90f295ba76e0390ab2eddad01e360776a64000312"
        }
      },
      "output": {
        "type": "json",
        "example": {
          "address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
          "chain_id": 8453,
          "report_id": "nbx4_ad470a5aab2b590648729ab90f295ba76e0390ab2eddad01e360776a64000312"
        }
      }
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "input"
      ],
      "properties": {
        "input": {
          "type": "object",
          "required": [
            "type",
            "method"
          ],
          "properties": {
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "enum": [
                "GET"
              ],
              "type": "string"
            },
            "queryParams": {
              "type": "object",
              "required": [
                "report_id"
              ],
              "properties": {
                "report_id": {
                  "type": "string",
                  "pattern": "^nbx4_[0-9a-f]{64}$",
                  "description": "ID of a stored report returned by the free POST /v1/prepare endpoint; this example identifies an existing public sample."
                }
              },
              "additionalProperties": false
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "type": "object",
              "required": [
                "report_id",
                "chain_id",
                "address"
              ],
              "properties": {
                "address": {
                  "type": "string",
                  "pattern": "^0x[0-9a-fA-F]{40}$"
                },
                "control": {
                  "type": "object"
                },
                "chain_id": {
                  "type": "integer",
                  "const": 8453
                },
                "code_hash": {
                  "type": "object"
                },
                "report_id": {
                  "type": "string",
                  "pattern": "^nbx4_[0-9a-f]{64}$"
                },
                "report_digest": {
                  "type": "string"
                },
                "policy_version": {
                  "type": "string"
                },
                "token_metadata": {
                  "type": "object"
                },
                "snapshot_comparison": {
                  "type": "object"
                },
                "source_verification": {
                  "type": "object"
                }
              },
              "description": "Selected envelope fields only; the paid response includes further observations and evidence."
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-10-24 20:32Z
Last indexed by Roundhouse
2026-10-26 17:20Z
Last enriched (probe, favicon, geo)
2026-10-18 20:15Z
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. 8 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 nbx4 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=nbx4'
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://nbx4.dev/v1/report, 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.