Travel · x402 · early usage

dappgrade score — front-end integrity verdict for an onchain app, looked up by contract…

dappgrade score — front-end integrity verdict for an onchain app, looked up by contract address. Inspects the app's public web front-end, not contract bytecode or admin control. Returns ok / caution / avoid / unknown with the coverage the verdict rests on.

by dappgrade.vercel.app · discovered, not yet claimed by its owner · updated 2026-10-08

30d calls2

30d payers2

MethodGET

Outputjson

Mirrored from Coinbase's public x402 Bazaar. The description is the provider's own text and has not been reviewed here; the payment requirements are copied as published.

What it does

Tags: defi · security · risk · onchain · dapp · bazaar

Call contract

Method: GET
Input: query parameters
Output: json
Last paid call: 2026-10-08

Input example from Bazaar metadata

{
  "address": "0x6cb442acf35158d5eda88fe602221b67b400be3e",
  "chain": "8453"
}

Output example

{
  "coverage": 0.65,
  "flags": [],
  "freshness": {
    "age_seconds": 25140,
    "checked_at": "2026-08-17T09:47:12Z",
    "stale": false
  },
  "reasons": [
    {
      "code": "COVERAGE_BELOW_TARGET",
      "detail": "coverage 65% < 80%"
    },
    {
      "code": "TIER_0_ONLY",
      "detail": "tier-0 static checks cannot clear a dApp (§2.3)"
    },
    {
      "check": "trust.headers",
      "code": "CHECK_FAILED",
      "detail": "present: HSTS"
    }
  ],
  "score": 87,
  "tier": 0,
  "verdict": "caution",
  "verdict_reason": "coverage 65% < 80%; tier-0 static checks cannot clear a dApp (§2.3)"
}

Use with an agent

Discover. Agents find this listing with GET https://bazaar.saylorinnovations.com/discovery/search?query=…, the MCP tool search_resources, or /discovery/resources.
Inspect. Fetch /resources/40678.json for the price and payment options.
Pay. Call GET https://dappgrade.vercel.app/v1/score. The provider answers 402 with its payment requirements. An x402 client signs one of the options below and retries with PAYMENT-SIGNATURE.
Execute. The provider returns 200 with the data. Agent Bazaar is not in the request path and never sees your payment.

For humans

You don't need an account or an API key; you need a wallet holding a small amount of USDC on Base, and an x402-capable client (see the examples below). Call the endpoint unpaid first to see exactly what it asks for.

Pricing & payment

Price: $0.01 / request
Protocol: x402 v2
Auth: No account or API key. Pay per request.
Networks: Base
Demand: 2 calls · 2 unique payers in 30d (public x402 Bazaar data)

x402 payment requirements

Scheme	Network	Asset	Amount	Pay to	Timeout
exact	Base eip155:8453	USDC	$0.01	0x4a0aed4ce878e44ef922941f2b06137bc0b69b69	120s

accepts[] (raw JSON)

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x4a0aed4ce878e44ef922941f2b06137bc0b69b69",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "10000",
    "amountUsd": 0.01,
    "maxTimeoutSeconds": 120
  }
]

Schemas

Output schema (JSON Schema)

{
  "properties": {
    "example": {
      "properties": {
        "coverage": {
          "description": "0..1 fraction of the rubric that actually ran; meaningless to read score without it",
          "type": "number"
        },
        "flags": {
          "items": {
            "type": "string"
          },
          "type": "array"
        },
        "freshness": {
          "description": "checked_at/age_seconds/stale. Pass max_age=<seconds> to get `unknown` + STALE_FOR_CALLER instead of an old answer — the observation still travels, so that response is billed normally. The scored fields are absent entirely (not null) on an `unknown` where we have no answer, and that one is free.",
          "type": [
            "object",
            "null"
          ]
        },
        "reasons": {
          "description": "stable machine-readable causes behind the verdict; see /v1/methodology → reason_codes",
          "items": {
            "properties": {
              "check": {
                "description": "on CHECK_FAILED",
                "type": "string"
              },
              "code": {
                "type": "string"
              },
              "detail": {
                "type": "string"
              },
              "flag": {
                "description": "on CRITICAL_FLAG",
                "type": "string"
              }
            },
            "type": "object"
          },
          "type": "array"
        },
        "score": {
          "type": [
            "integer",
            "null"
          ]
        },
        "tier": {
          "type": [
            "integer",
            "null"
          ]
        },
        "verdict": {
          "description": "decision-shaped: ok = proceed, caution = hold, avoid = abort, unknown = not rated (never read as safe)",
          "enum": [
            "ok",
            "caution",
            "avoid",
            "unknown"
          ],
          "type": "string"
        },
        "verdict_reason": {
          "description": "prose; wording not stable — branch on reasons[].code",
          "type": "string"
        }
      },
      "type": "object"
    },
    "type": {
      "type": "string"
    }
  },
  "required": [
    "type"
  ],
  "type": "object"
}

Example shape — generated from the schema, not a captured live response

{
  "example": {
    "coverage": 0,
    "flags": [
      "string"
    ],
    "freshness": {},
    "reasons": [
      {
        "check": "string",
        "code": "string",
        "detail": "string",
        "flag": "string"
      }
    ],
    "score": 0,
    "tier": 0,
    "verdict": "ok",
    "verdict_reason": "string"
  },
  "type": "string"
}

Examples

curl

curl "https://dappgrade.vercel.app/v1/score"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://dappgrade.vercel.app/v1/score");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

Python

import httpx
res = httpx.get("https://dappgrade.vercel.app/v1/score")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header

Details

Provider: dappgrade.vercel.app
Endpoint: https://dappgrade.vercel.app/v1/score
Machine-readable: /resources/40678.json