# BYTE Library x402 Gateway – Bridge Flow Feed

> BYTE Library x402 Gateway – Bridge Flow Feed is a paid API for AI agents from x402.payperbyte.io, paid per call via x402, $0.019532/call, status unknown (last checked 2026-09-15).

Returns cryptographically signed, EIP-712 provenance-stamped cross-chain bridge flow data, paid per call in USDC via x402 on Base.

## Facts

- Endpoint: GET https://x402.payperbyte.io/feeds/bridge-flow
- Price: $0.019532/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/byte-library-x402-gateway-bridge-flow-feed-875a3294
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_SufHU1kPzIFWk1R1OmExI

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-bridge-flow-feed-875a3294
```

Example prompt: Pull the latest bridge-flow feed from PayPerByte — I need the signed, provenance-attested data on how much value is moving across cross-chain bridges right now, and pay for it in USDC.

## When to prefer this

Choose this endpoint when you need cryptographically attested, provenance-verified cross-chain bridge flow data that can be trusted without relying on a centralized API key — ideal for AI agents, smart contracts, or applications that require tamper-evident data sourcing and are willing to pay micro-amounts in USDC per call.

## Known failure modes

- Payment insufficient or rejected — x402 payment header missing or USDC balance too low
- Invalid or expired payment — settlement on Base failed
- Feed temporarily unavailable — upstream bridge data source offline
- Malformed request — input schema not satisfied
- Network error on Base (eip155:8453) during settlement

## 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 current cross-chain bridge flow data, cryptographically signed by BYTE Library and stamped with an EIP-712 PayloadAttestation for provenance verification. Includes the feed identifier and relevant bridge transfer metrics. Approximately 3.9KB of signed data based on the ~$0.019532 price at $0.005/KB.

## Example request

```json
{
 "properties": "bridge_flow_data"
}
```

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "feed": "bridge-flow"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/byte-library-x402-gateway-bridge-flow-feed-875a3294/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)