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Quack AI Q402 Agent Trust Check
x402
Quack AI Q402 Agent Trust Check is a paid API for AI agents from q402.quackai.ai, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-10).
Looks up the trust profile and on-chain reputation of an EVM wallet address, returning risk flags, ERC-8004 identity registration status, and recent transaction activity.
Price / call$0.02
Success—
StatusUnknown
How this service works
Q402 is a gasless payment protocol for EVM chains. Your users pay zero gas. You sponsor it, invisibly and instantly.
Output
Returns a JSON object containing: the wallet address, payment timestamp, a receipt ID, the USDC price charged, ERC-8004 identity registration status and registration list from BSC and Base, recent on-chain transaction activity bucket (e.g. 10-49 txns in last 900 blocks), whether recent activity was detected, and an array of risk flags each with a flag name, evidence string, and severity level. Reputation field may be null if no reputation data is available.
Example use cases
Pre-payment wallet risk screening
“Before I release payment to 0xAb5801a7D398351b8bE11C439e05C5B3259aeC9B, can you check their trust profile — specifically any risk flags and whether they're registered with ERC-8004 identity on Base or BSC?”
Agent-to-agent trust verification
“My AI agent is about to interact with another agent at wallet 0x3C44CdDdB6a900fa2b585dd299e03d12FA4293BC — can you pull their Q402 trust score and tell me if they've been active on-chain recently?”
New user onboarding identity check
“A new user wants to join our platform with wallet 0x90F79bf6EB2c4f870365E785982E1f101E93b906 — can you check if they have an ERC-8004 identity registered and flag any risk signals so I know whether to trust them?”
Technical details
Endpoint
GEThttps://q402.quackai.ai/api/x402/agent-trust/%7Baddress%7DWhen to prefer
Choose this endpoint when you need a fast, pay-per-call trust and identity check for any EVM wallet address, especially when you need ERC-8004 identity registry status combined with on-chain activity signals and risk flags in a single response. Prefer this over building your own on-chain queries when you want a pre-packaged risk assessment without managing RPC connections or gas costs.
Side effects
- Invalid or malformed EVM address returns an error
- Address with no on-chain history may return empty activity and null reputation
- ERC-8004 registry query failure on BSC or Base returns partial data
- Payment failure or insufficient USDC balance prevents the call from completing
- Network RPC downtime may cause on-chain activity lookup to fail
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Output
Schema · Response
{
"type": "json",
"example": {
"paidAt": "2026-08-19T05:00:00.000Z",
"address": "0x70997970C51812dc3A010C7d01b50e0d17dc79C8",
"erc8004": {
"source": "ERC-8004 IdentityRegistry — BSC (0x8004A169FB4a3325136EB29fA0ceB6D2e539a432) and Base queried",
"isRegistered": false,
"registrations": []
},
"receipt": "atx_a3b4c5d6e7f8a9b0c1d2e3f4",
"priceUsdc": 0.02,
"riskFlags": [
{
"flag": "no_8004_identity",
"evidence": "ERC-8004 IdentityRegistry queried on BSC (0x8004A169FB4a3325136EB29fA0ceB6D2e539a432) and Base — balanceOf returned 0",
"severity": "low"
}
],
"reputation": null,
"onChainActivity": {
"source": "Base mainnet eth_getTransactionCount (public RPC; scan window 900 blocks ≈ 30 min)",
"txCountBucket": "10-49",
"recentActivityDetected": true,
"recentActivityWindowBlocks": 900
}
}
}Tags
x402
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