Pay Guard
Pay Guard: pre-payment allow/warn/block check for x402. Send your planned purchase (domain, max_price_usd, asset/network) plus the 402 challenge (payTo, amount, asset, network, resource). Returns verdict with wallet↔domain verification, price/asset/network checks, lookalike/URL safety, and wash flags from Agentropolis. Deterministic, no LLM.
Not tested: has real-world effectsour last check, 2026-10-18
0 of 0checks answered this week
n/amedian answer time
$0.01listed price per call
n/aprice it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://seenly-pay-guard.vercel.app/api/guard
| Category | Market data |
|---|---|
| Provider host | seenly-pay-guard.vercel.app |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 3 from 3 payers (the provider's figure, not ours) |
Our checks, last 30 days
We never call tools that send, buy, move money or file anything, not even without paying.
Example input (from the provider)
{
"body": {
"asset": "USDC",
"challenge": {
"amount": "30000",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"network": "eip155:8453",
"payTo": "0xeE6239F3E17bEBe5e89F21F29D74D68CAa0d78CE",
"resource": "https://seenly-payload-check.vercel.app/api/check"
},
"domain": "seenly-payload-check.vercel.app",
"max_price_usd": 0.05,
"network": "eip155:8453"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": true,
"properties": {
"amount": {
"type": "string"
},
"asset": {
"default": "USDC",
"type": "string"
},
"challenge": {
"description": "The x402 402 challenge / accept entry the agent received.",
"properties": {
"amount": {
"description": "Atomic USDC units (6 decimals), e.g. \"10000\" = $0.01.",
"type": "string"
},
"asset": {
"type": "string"
},
"network": {
"type": "string"
},
"payTo": {
"type": "string"
},
"resource": {
"description": "HTTPS resource URL from the 402.",
"type": "string"
}
},
"required": [
"payTo",
"amount"
],
"type": "object"
},
"domain": {
"description": "Planned seller domain / host the agent intends to pay.",
"type": "string"
},
"listed_price_usd": {
"description": "Optional expected listed price from the agent\u2019s plan.",
"minimum": 0,
"type": "number"
},
"max_price_usd": {
"description": "Hard cap the agent will not exceed (USD).",
"minimum": 0,
"type": "number"
},
"network": {
"default": "eip155:8453",
"type": "string"
},
"payTo": {
"description": "Shortcut: challenge.payTo at top level.",
"type": "string"
},
"requestKey": {
"maxLength": 128,
"type": "string"
}
},
"required": [
"max_price_usd"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"advice": {
"type": "string"
},
"checks": {
"type": "object"
},
"coverage": {
"type": "object"
},
"reasons": {
"items": {
"type": "string"
},
"type": "array"
},
"verdict": {
"enum": [
"allow",
"warn",
"block"
],
"type": "string"
}
},
"required": [
"verdict",
"reasons",
"checks"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}