# BYTE Library x402 Gateway — x402-pulse Feed

> BYTE Library x402 Gateway — x402-pulse Feed is a paid API for AI agents from x402.payperbyte.io, paid per call via x402, $0.014649/call, status unknown (last checked 2026-09-14).

Returns a cryptographically signed, EIP-712 provenance-stamped x402-pulse data payload covering code activity metrics, paid per-call in USDC via x402 protocol on Base with no API keys required.

## Facts

- Endpoint: GET https://x402.payperbyte.io/feeds/x402-pulse
- Price: $0.014649/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/byte-library-x402-gateway-x402-pulse-feed-78ee3034
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_93O1HeyuAdACAbcXVN1T8

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-x402-pulse-feed-78ee3034
```

Example prompt: Fetch me the latest x402-pulse feed from BYTE Library — I need the cryptographically signed, EIP-712 provenance-stamped payload and I'm paying with USDC via x402 from my wallet on Base.

## When to prefer this

Choose this endpoint when an AI agent needs verifiable, tamper-evident data with cryptographic provenance (EIP-712 attestation) for the x402-pulse (code activity / developer metrics) feed, and prefers wallet-based micropayment over API-key management. Ideal for trustless agent pipelines where data authenticity must be auditable on-chain.

## Known failure modes

- Insufficient USDC balance in wallet — payment rejected, 402 response
- Wallet not configured or invalid address — authentication failure
- Feed temporarily unavailable — 5xx server error
- Malformed x402 payment header — 400 bad request
- Network congestion on Base causing payment settlement delay

## How this service works

Rolling-window metrics for the PayPerByte x402 facilitator: verify/settle counts, per-network/scheme breakdowns, top payers, optional on-chain cross-check.

## Output

A JSON payload containing the x402-pulse feed data, cryptographically signed and EIP-712 PayloadAttestation provenance-stamped, returned after a USDC micropayment (~$0.0146) is settled on Base (eip155:8453). Includes feed name confirmation and the signed data blob.

## Example request

```json
{
 "properties": "code_activity_metrics"
}
```

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/byte-library-x402-gateway-x402-pulse-feed-78ee3034/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)