Verify an x402 purchase before an AI agent signs
Verify an x402 purchase before an AI agent signs. Validate the live HTTP 402 challenge, Base network, USDC asset, quoted price, recipient, price ceiling, buyer funding, optional gas reserve, and destination hazards, then receive a machine-readable safe-to-sign, fund, review, or reject decision. No account or API key.
Not tested: has real-world effectsour last check, 2026-09-24
0 of 0checks answered this week
n/amedian answer time
$0.01listed price per call
n/aprice it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://anywaypossible.com/api/payment-guard
| Category | Market data |
|---|---|
| Provider host | anywaypossible.com |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 3 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
We never call tools that send, buy, move money or file anything, not even without paying.
Example input (from the provider)
{
"body": {
"expectedPayTo": "0x2222222222222222222222222222222222222222",
"maxAmountUsdc": "0.10",
"minGasReserveEth": "0",
"payerAddress": "0x1111111111111111111111111111111111111111",
"serviceUrl": "https://example.com/api/report"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"properties": {
"expectedPayTo": {
"pattern": "^0x[a-fA-F0-9]{40}$",
"type": "string"
},
"maxAmountUsdc": {
"pattern": "^[0-9]+(\\.[0-9]{1,6})?$",
"type": "string"
},
"minGasReserveEth": {
"pattern": "^[0-9]+(\\.[0-9]{1,18})?$",
"type": "string"
},
"payerAddress": {
"pattern": "^0x[a-fA-F0-9]{40}$",
"type": "string"
},
"serviceUrl": {
"format": "uri",
"type": "string"
}
},
"required": [
"payerAddress",
"serviceUrl",
"maxAmountUsdc"
],
"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": {
"alerts": {
"items": {
"type": "string"
},
"type": "array"
},
"asset": {
"type": "string"
},
"checks": {
"items": {
"type": "object"
},
"type": "array"
},
"decision": {
"type": "string"
},
"network": {
"type": "string"
},
"quotedAmountUsdc": {
"type": "string"
},
"quotedPayTo": {
"type": "string"
},
"recommendedAction": {
"type": "string"
},
"riskLevel": {
"type": "string"
},
"safeToSign": {
"type": "boolean"
}
},
"required": [
"decision",
"safeToSign",
"riskLevel",
"quotedAmountUsdc",
"quotedPayTo",
"network",
"asset",
"checks",
"alerts",
"recommendedAction"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}