dappgrade
The autonomous stack for every app and agent.
TradingLiveeip155:8453Exactvia wellknown:dappgrade.vercel.app
DefiSecurityRiskOnchainDappPre-transaction
Calls · 30d
1↓ 53%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 32 snapshots so far.
$0.07
Verified settled volume
7 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.
—
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
0x4a0aed4ce878e44ef922941f2b06137bc0b69b69The 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": "0x4a0aed4ce878e44ef922941f2b06137bc0b69b69",
"amount": "10000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 120
}
],
"resource": {
"url": "https://dappgrade.vercel.app/v1/score",
"tags": [
"defi",
"security",
"risk",
"onchain",
"dapp",
"pre-transaction"
],
"mimeType": "application/json",
"description": "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.",
"serviceName": "dappgrade"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"chain": "8453",
"address": "0x6cb442acf35158d5eda88fe602221b67b400be3e"
}
},
"output": {
"type": "json",
"example": {
"tier": 0,
"flags": [],
"score": 87,
"reasons": [
{
"code": "COVERAGE_BELOW_TARGET",
"detail": "coverage 65% < 80%"
},
{
"code": "TIER_0_ONLY",
"detail": "tier-0 static checks cannot clear a dApp (§2.3)"
},
{
"code": "CHECK_FAILED",
"check": "trust.headers",
"detail": "present: HSTS"
}
],
"verdict": "caution",
"coverage": 0.65,
"freshness": {
"stale": false,
"checked_at": "2026-08-17T09:47:12Z",
"age_seconds": 25140
},
"verdict_reason": "coverage 65% < 80%; tier-0 static checks cannot clear a dApp (§2.3)"
}
}
},
"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": [
"chain",
"address"
],
"properties": {
"chain": {
"type": "string",
"description": "EVM chain — id (8453), CAIP-2 (eip155:8453), or name (base, mainnet, arbitrum, optimism)"
},
"address": {
"type": "string",
"pattern": "^0x[a-fA-F0-9]{40}$",
"description": "the contract address the agent is about to call"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"properties": {
"tier": {
"type": [
"integer",
"null"
]
},
"flags": {
"type": "array",
"items": {
"type": "string"
}
},
"score": {
"type": [
"integer",
"null"
]
},
"reasons": {
"type": "array",
"items": {
"type": "object",
"properties": {
"code": {
"type": "string"
},
"flag": {
"type": "string",
"description": "on CRITICAL_FLAG"
},
"check": {
"type": "string",
"description": "on CHECK_FAILED"
},
"detail": {
"type": "string"
}
}
},
"description": "stable machine-readable causes behind the verdict; see /v1/methodology → reason_codes"
},
"verdict": {
"enum": [
"ok",
"caution",
"avoid",
"unknown"
],
"type": "string",
"description": "decision-shaped: ok = proceed, caution = hold, avoid = abort, unknown = not rated (never read as safe)"
},
"coverage": {
"type": "number",
"description": "0..1 fraction of the rubric that actually ran; meaningless to read score without it"
},
"freshness": {
"type": [
"object",
"null"
],
"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."
},
"verdict_reason": {
"type": "string",
"description": "prose; wording not stable — branch on reasons[].code"
}
}
}
}
}
}
}
}
},
"x402Version": 2
}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≈ $0.01 USD
on Base · exact scheme
Pay 0.01 USDC on Base to 0x4a0a…69b69. The signed payment is good for 2 minutes.
- Paid to
- 0x4a0a…69b69
- USD Coin contract
- 0x8335…02913
- Payment window
- 2 minutes
- As published
- 10000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x4a0aed4ce878e44ef922941f2b06137bc0b69b69",
"amount": "10000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 120
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"chain": "8453",
"address": "0x6cb442acf35158d5eda88fe602221b67b400be3e"
}
},
"output": {
"type": "json",
"example": {
"tier": 0,
"flags": [],
"score": 87,
"reasons": [
{
"code": "COVERAGE_BELOW_TARGET",
"detail": "coverage 65% < 80%"
},
{
"code": "TIER_0_ONLY",
"detail": "tier-0 static checks cannot clear a dApp (§2.3)"
},
{
"code": "CHECK_FAILED",
"check": "trust.headers",
"detail": "present: HSTS"
}
],
"verdict": "caution",
"coverage": 0.65,
"freshness": {
"stale": false,
"checked_at": "2026-08-17T09:47:12Z",
"age_seconds": 25140
},
"verdict_reason": "coverage 65% < 80%; tier-0 static checks cannot clear a dApp (§2.3)"
}
}
},
"schema": {
"type": "object",
"$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": [
"chain",
"address"
],
"properties": {
"chain": {
"type": "string",
"description": "EVM chain — id (8453), CAIP-2 (eip155:8453), or name (base, mainnet, arbitrum, optimism)"
},
"address": {
"type": "string",
"pattern": "^0x[a-fA-F0-9]{40}$",
"description": "the contract address the agent is about to call"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"properties": {
"tier": {
"type": [
"integer",
"null"
]
},
"flags": {
"type": "array",
"items": {
"type": "string"
}
},
"score": {
"type": [
"integer",
"null"
]
},
"reasons": {
"type": "array",
"items": {
"type": "object",
"properties": {
"code": {
"type": "string"
},
"flag": {
"type": "string",
"description": "on CRITICAL_FLAG"
},
"check": {
"type": "string",
"description": "on CHECK_FAILED"
},
"detail": {
"type": "string"
}
}
},
"description": "stable machine-readable causes behind the verdict; see /v1/methodology → reason_codes"
},
"verdict": {
"enum": [
"ok",
"caution",
"avoid",
"unknown"
],
"type": "string",
"description": "decision-shaped: ok = proceed, caution = hold, avoid = abort, unknown = not rated (never read as safe)"
},
"coverage": {
"type": "number",
"description": "0..1 fraction of the rubric that actually ran; meaningless to read score without it"
},
"freshness": {
"type": [
"object",
"null"
],
"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."
},
"verdict_reason": {
"type": "string",
"description": "prose; wording not stable — branch on reasons[].code"
}
}
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- —
- Last indexed by Roundhouse
- 2026-09-19 02:45Z
- Last enriched (probe, favicon, geo)
- 2026-09-19 03:15Z
- x402 version
- 2
- Max timeout
- 120s
- Liveness probe
- HTTP 402
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. 32 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.
Show the promptHide the prompt
Using Roundhouse, look up the x402 service dappgrade 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=dappgrade' 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://dappgrade.vercel.app/v1/score, 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.