Lumen Pre-Sign Check
Lumen Pre-Sign Check: call before signing any EVM transaction or EIP-712 message. Returns {summary, flags[], verdict} (looks_ok | review | do_not_sign_unless_intended). Flags unlimited approvals, Permit/Permit2, setApprovalForAll, admin calls, zero-price Seaport orders, long deadlines, chain and x402 payTo mismatch. Policy: abort on do_not_sign_unless_intended, escalate review. Informational, no simulation. $0.002, not charged on error.
Answers HTTP 404 without x402 payment termsour last check, 2026-10-11
0 of 1checks answered this week
n/amedian answer time
$0.002listed price per call
n/aprice it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://lumenworks-x402-decoder.onrender.com/v1/tx/explain
| Category | Market data |
|---|---|
| Provider host | lumenworks-x402-decoder.onrender.com |
| Networks | eip155:42220, eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-11 | no x402 terms | 404 | 236 ms |
Example input (from the provider)
{
"body": {
"chainId": 8453,
"transaction": {
"data": "0x095ea7b3000000000000000000000000111111125421ca6dc452d289314280a0f8842a65ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
"to": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"value": "0"
}
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"anyOf": [
{
"required": [
"transaction"
]
},
{
"required": [
"calldata"
]
},
{
"required": [
"typedData"
]
}
],
"properties": {
"calldata": {
"description": "Shortcut: calldata hex when you have no tx object",
"type": "string"
},
"chainId": {
"description": "Chain the wallet is on; used for chain-mismatch checks",
"type": "number"
},
"expected_pay_to": {
"description": "For x402/EIP-3009 payments: the payTo you expect; mismatch is flagged",
"type": "string"
},
"transaction": {
"description": "Unsigned EVM transaction",
"properties": {
"data": {
"description": "Calldata hex (0x\u2026)",
"type": "string"
},
"to": {
"description": "Target contract/address (0x\u2026)",
"type": "string"
},
"value": {
"description": "Native value in wei (decimal string)",
"type": "string"
}
},
"required": [
"data"
],
"type": "object"
},
"typedData": {
"description": "EIP-712 typed data {domain, types, primaryType, message} (Permit, Permit2, EIP-3009, Seaport\u2026)",
"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": {
"calldata": {
"properties": {
"candidates": {
"items": {
"properties": {
"args": {
"items": {
"type": "string"
},
"type": "array"
},
"signature": {
"type": "string"
}
},
"type": "object"
},
"type": "array"
},
"decoded": {
"properties": {
"args": {
"items": {
"type": "string"
},
"type": "array"
},
"signature": {
"type": "string"
}
},
"type": "object"
},
"selector": {
"type": "string"
},
"signaturesFound": {
"type": "number"
},
"source": {
"type": "string"
}
},
"type": "object"
},
"disclaimer": {
"type": "string"
},
"flags": {
"items": {
"properties": {
"code": {
"type": "string"
},
"level": {
"type": "string"
},
"msg": {
"type": "string"
}
},
"type": "object"
},
"type": "array"
},
"kind": {
"type": "string"
},
"risk": {
"type": "string"
},
"summary": {
"items": {
"type": "string"
},
"type": "array"
},
"to": {
"type": "string"
},
"toLabel": {
"type": "string"
},
"valueWei": {
"type": "string"
},
"verdict": {
"type": "string"
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}