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PayPerByte Package Verdict Oracle
x402
PayPerByte Package Verdict Oracle is a paid API for AI agents from x402.payperbyte.io, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-15).
Returns a cryptographically attested ALLOW/WARN/BLOCK security verdict for an npm or PyPI package, with EIP-712 provenance signing.
Price / call$0.1
Success—
StatusUnknown
How this service works
Signed ALLOW/WARN/BLOCK on installing a package@version: OSV.dev malicious-corpus + typosquat distance + registry signals. Verify before you install.
Output
A JSON object containing: a verdict field (ALLOW, WARN, or BLOCK), a numeric security score (0-100), an array of reasons citing signals from OSV.dev, typosquat detection, registry metadata, and known-bad lists, a pinned resolved version, and an EIP-712 attestation object with the signer address, signature, payload hash, and BYTE Library domain info (Arbitrum Sepolia chainId 421614) proving who signed the exact answer bytes.
Example use cases
Pre-install dependency safety check
“Before I install 'colors' from npm, can you check whether it's safe or if there have been any known malicious releases or supply chain issues?”
CI pipeline package screening
“Screen the PyPI package 'cryptography' version 41.0.3 for me — I need an ALLOW, WARN, or BLOCK verdict with a signed receipt before my build pipeline proceeds.”
Typosquat detection for suspicious package
“I found a package called 'reacts' on npm — can you check if it's a typosquat or otherwise malicious? Give me the full verdict with attestation.”
Technical details
Endpoint
POSThttps://x402.payperbyte.io/feeds/pkg-verdictWhen to prefer
Use this endpoint when you need a cryptographically attested, tamper-evident security verdict for a specific npm or PyPI package before installation, publishing, or deployment — especially in agentic pipelines where you need an on-chain-anchored EIP-712 signature to prove provenance. Prefer this over generic vulnerability databases when you need a single ALLOW/WARN/BLOCK decision signal with signed accountability, or when screening for typosquats alongside CVE data. Not suited for bulk dependency audits (single package per call) or ecosystems beyond npm and PyPI.
Side effects
- Package not found in the specified ecosystem — registry lookup fails
- Invalid or non-existent version string — version resolution fails
- Unsupported ecosystem value (only npm and pypi accepted)
- Package name exceeds 214-character limit
- Payment not received or x402 payment header invalid — 402 response returned
- Attestation signer address cannot be recovered — signature malformed
- Network timeout contacting upstream registries or OSV.dev
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| package | string | Package name (npm scoped names like @scope/name allowed; PyPI names are PEP-503-normalized for matching). |
| version | string | Exact version to judge. Omitted => the registry's latest is resolved and pinned into answer.query.version. |
| ecosystem | string | Package ecosystem. |
Output
Schema · Response
{
"type": "json",
"example": {
"_note": "Illustrative response shape — not a live answer. ALLOW/WARN/BLOCK is a screening signal. The embedded EIP-712 receipt (domain chainId 421614 = Arbitrum Sepolia, a frozen signing namespace, not a settlement rail) proves who signed the exact answer bytes — not that the verdict is correct.",
"answer": {
"v": "pkg-verdict/v1",
"query": {
"package": "left-pad",
"version": null,
"ecosystem": "npm",
"version_requested": null
},
"score": 96,
"reasons": [
"illustrative — real answers cite the pv-v1 OSV.dev / typosquat / registry / known-bad signals judged"
],
"verdict": "ALLOW",
"methodology": "pv-v1"
},
"attestation": {
"domain": {
"name": "BYTE Library",
"chainId": 421614,
"version": "1"
},
"signer": "0x…",
"signature": "0x…",
"payloadHash": "0x…"
}
}
}Tags
x402
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