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nbx4 Contract Observations Report Fetch
x402
nbx4 Contract Observations Report Fetch is a paid API for AI agents from nbx4.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-11-01).
Retrieves a block-pinned, immutable smart contract observation report for a given report ID across 16 EVM mainnets
Price / call$0.01
Success—
StatusUnknown
How this service works
Preliminary, limited EVM mechanism evidence from a block-pinned snapshot: matched source syntax, proxy and token state, and optional V2 pool observations. Unknowns remain unknown; not a security audit or sellability verdict.
Output
Returns a JSON object containing the report ID, report digest (SHA-256 hex), block hash, block number, chain ID, contract address, policy version, and a findings object with block-pinned contract observations and explicit unknowns. The full paid report includes preliminary findings and unknowns not visible in the free envelope.
Example use cases
Audit token contract at pinned block
“Fetch the contract observation report nbx4_v3_0d0d93c231b6e7e2eb022eda3edc3abdf7fda8b3eb84bae630fd8320a042dbc0 and tell me what the findings say about the contract's proxy slots and owner at that block.”
Verify report digest for integrity check
“I need to confirm the report digest for nbx4_v3_0d0d93c231b6e7e2eb022eda3edc3abdf7fda8b3eb84bae630fd8320a042dbc0 — can you retrieve the full report and give me the reportDigest so I can verify it hasn't been tampered with?”
Cross-chain contract state review
“Retrieve the previously prepared nbx4 block-pinned report nbx4_v3_0d0d93c231b6e7e2eb022eda3edc3abdf7fda8b3eb84bae630fd8320a042dbc0 and summarize the chain ID, block number, and any unknowns listed in the findings.”
Technical details
Endpoint
GEThttps://nbx4.dev/v3/report?utm_source=zero.xyzWhen to prefer
Use this endpoint when you have already obtained a report ID from POST /v3/prepare and need to retrieve the immutable, block-pinned findings for a specific EVM smart contract. Prefer this over re-running a full analysis when you need a reproducible, auditable snapshot tied to a specific block hash across any of the 16 supported EVM mainnets.
Side effects
- Invalid or malformed report_id (does not match ^nbx4_v3_[0-9a-f]{64}$) returns a 400 error
- Report ID not found or not yet prepared returns a 404 error
- Payment not received or x402 payment flow incomplete returns a 402 Payment Required
- Network or upstream RPC failure on the relevant EVM chain returns a 503 or timeout
- Rate limiting may apply for rapid successive reads
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"reportId": "nbx4_v3_9846634448486c5bf601313396b111fdbae6fd3586d4ba088fd598f04bca7a09",
"reportDigest": "9846634448486c5bf601313396b111fdbae6fd3586d4ba088fd598f04bca7a09"
}
}Tags
x402
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