x402-preflight
x402-preflight: confirm your wallet can transact, and see your balance, in one certified call. Pay $0.01 USDC on Base, get a signed on-chain-anchored receipt. The safe first transaction before you ship real volume.
Answeringour last check, 2026-09-24
1 of 1checks answered this week
809 msmedian answer time
$0.01listed price per call
$0.01price 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://kenoodl.com/preflight
| Category | Market data |
|---|---|
| Provider host | kenoodl.com |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 4 from 3 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-24 | valid payment request | 402 | $0.01 | 809 ms |
Example input (from the provider)
{
"body": {
"wallet": "0x\u2026 (the Base wallet to preflight; defaults to the paying wallet if omitted)"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"properties": {
"wallet": {
"description": "The Base wallet you want to preflight. If omitted, it defaults to the paying wallet read from the x402 payment payload.",
"type": "string"
}
},
"required": [
"wallet"
]
},
"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": {
"receipt": {
"properties": {
"eth_balance": {
"type": "string"
},
"genesis_deploy_tx": {
"type": [
"string",
"null"
]
},
"payer": {
"type": "string"
},
"prev_settlement_tx": {
"type": [
"string",
"null"
]
},
"tx_hash": {
"type": "string"
},
"usdc_balance": {
"type": "string"
}
},
"required": [
"tx_hash",
"payer",
"usdc_balance",
"eth_balance"
],
"type": "object"
},
"status": {
"enum": [
"settled"
],
"type": "string"
}
},
"required": [
"status",
"receipt"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}