Analyze a Base Mainnet token contract
Analyze a Base Mainnet token contract: block-pinned owner(), ERC-1967 proxy slots, ERC-20 metadata, code hash, best-effort source match and prior-snapshot comparison when available. Free POST /v1/prepare returns report_id; paid GET /v1/report reads it for 0.02 USDC via x402. Not a security audit.
Answeringour last check, 2026-10-19
1 of 1checks answered this week
740 msmedian answer time
$0.02listed price per call
$0.02price 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
GET https://nbx4.dev/v1/report
| Category | Code and developer |
|---|---|
| Provider host | nbx4.dev |
| Networks | 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 |
|---|---|---|---|---|
| 2026-10-19 | valid payment request | 402 | $0.02 | 740 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"report_id": "nbx4_ad470a5aab2b590648729ab90f295ba76e0390ab2eddad01e360776a64000312"
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"additionalProperties": false,
"properties": {
"report_id": {
"description": "ID of a stored report returned by the free POST /v1/prepare endpoint; this example identifies an existing public sample.",
"pattern": "^nbx4_[0-9a-f]{64}$",
"type": "string"
}
},
"required": [
"report_id"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"description": "Selected envelope fields only; the paid response includes further observations and evidence.",
"properties": {
"address": {
"pattern": "^0x[0-9a-fA-F]{40}$",
"type": "string"
},
"chain_id": {
"const": 8453,
"type": "integer"
},
"code_hash": {
"type": "object"
},
"control": {
"type": "object"
},
"policy_version": {
"type": "string"
},
"report_digest": {
"type": "string"
},
"report_id": {
"pattern": "^nbx4_[0-9a-f]{64}$",
"type": "string"
},
"snapshot_comparison": {
"type": "object"
},
"source_verification": {
"type": "object"
},
"token_metadata": {
"type": "object"
}
},
"required": [
"report_id",
"chain_id",
"address"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}