# BYTE Library x402 Gateway — CVE Facts Feed

> BYTE Library x402 Gateway — CVE Facts Feed is a paid API for AI agents from x402.payperbyte.io, paid per call via x402, $0.004883/call, status unknown (last checked 2026-09-13).

Returns cryptographically signed, EIP-712 provenance-stamped CVE (Common Vulnerabilities and Exposures) threat-intelligence facts, paid per-call in USDC via x402 with no API key required.

## Facts

- Endpoint: GET https://x402.payperbyte.io/feeds/cve-facts
- Price: $0.004883/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/byte-library-x402-gateway-cve-facts-feed-38de3130
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Yswkrw_2iVB_vfDEuVyGl

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability byte-library-x402-gateway-cve-facts-feed-38de3130
```

Example prompt: Pull the latest CVE facts from the BYTE Library cve-facts feed — I need the cryptographically signed, provenance-stamped payload so I can verify the data's authenticity before ingesting it into our security pipeline.

## When to prefer this

Choose this endpoint when you need CVE vulnerability data with cryptographic provenance guarantees (EIP-712 attestation) for audit, compliance, or trustless AI pipelines, and you want to pay per call in USDC without managing API keys or subscriptions.

## Known failure modes

- 402 Payment Required — wallet has insufficient USDC balance on Base
- Invalid or malformed x402 payment header — settlement rejected
- Unknown or unsupported CVE query properties — empty or error response
- Network timeout on Base settlement — payment not confirmed in time
- Rate limiting or feed unavailability — service temporarily down

## How this service works

Verified, provenance-first data feeds for AI agents. Every payload is cryptographically signed and EIP-712 PayloadAttestation provenance-stamped — covering crypto markets, DeFi yields, weather, earthquakes, news, code-pulse, threat-intel, and a slashable fact-oracle. Pay per call in USDC over x402 with no API keys — a wallet, not a secret on the box. Settlement is on Base (eip155:8453). Price is per-feed, derived from expected payload size at $0.005000/KB (floor $0.001000).

## Output

A JSON payload containing CVE vulnerability facts, cryptographically signed and stamped with an EIP-712 PayloadAttestation for provenance verification, returned after a USDC micropayment (~$0.004883) settles on Base.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "feed": "cve-facts"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/byte-library-x402-gateway-cve-facts-feed-38de3130/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.payperbyte.io](https://www.zero.xyz/host/x402.payperbyte.io/llms.txt)