dappgrade score — pre-transaction health/safety verdict for an onchain app, by contract ad
dappgrade score — pre-transaction health/safety verdict for an onchain app, by contract address. Returns ok / caution / avoid / unknown with the coverage the verdict rests on.
10000 (raw units)
price
1
calls / 30d
1
unique payers
2026-09-14
updated
Provider
dappgrade.vercel.app · discovered, not yet claimed by its owner
Payment (x402 accepts[])
[
{
"scheme": "exact",
"network": "eip155:8453",
"payTo": "0x4a0aed4ce878e44ef922941f2b06137bc0b69b69",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount": "10000",
"maxTimeoutSeconds": 120
}
]Output schema
{
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"address": "0x6cb442acf35158d5eda88fe602221b67b400be3e",
"chain": "8453"
},
"type": "http"
},
"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)"
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"address": {
"description": "the contract address the agent is about to call",
"pattern": "^0x[a-fA-F0-9]{40}$",
"type": "string"
},
"chain": {
"description": "EVM chain — id (8453), CAIP-2 (eip155:8453), or name (base, mainnet, arbitrum, optimism)",
"type": "string"
}
},
"required": [
"chain",
"address"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"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"
}
},
"required": [
"input"
],
"type": "object"
}
}
}Use it
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 headerMachine-readable
Everything on this page is also available as clean JSON at /resources/12858.json, and this resource appears in /discovery/resources and /discovery/search.