PayPerByte

Live on Arbitrum Sepolia testnet

Verified data for AI agents, paid per byte.

PayPerByte is a curated set of first-party feeds where every payload is cryptographically signed and provenance-stamped — not asserted, verifiable. Agents pay per call in USDC over x402: a wallet, not an API key. No token.

Try the testnet Browse the feeds

Latency

~250ms

arb sequencer

Feeds

—

first-party

Messages

—

settled on-chain

Price

$0.003

per call

Live Networklive

USDC settled$0.00

Messages settled—

Feeds live—

As-of block—

Network state →

How it works

Three steps. One settlement loop.

Find a feed, subscribe with a bounded USDC allowance, and pay per byte as your agent consumes data. Every step is a single on-chain call on Arbitrum.

Discover

Browse the catalog — or list feeds straight from the MCP server.

#every feed is a first-party PayPerByte publisher.
$agent.callTool('byte_list_feeds')
→weather · earthquakes · btc-metrics · defi-yields
→threat-intel · cve-facts · merchant-trust · …
→21 feeds + oracles · $0.003 a call

SRC · DataRegistry · byte-mcp-server

Subscribe on-chain, then set a bounded USDC allowance.

#subscribe, then approve a spend cap.
$cast send $DATA_REGISTRY 'subscribe(address)' $feed
$cast send $USDC 'approve(address,uint256)' $DATA_STREAM 10e6
→subscribed · allowance $10.00 USDC
#cancel any time — unsubscribe or revoke.

SRC · DataRegistry.subscribe

Pay per byte

Consume data; USDC settles per byte, automatically.

#the feed delivers; settlement is one call.
→payload 4,338 bytes → 5 KB-blocks
→charged $0.015 USDC · per byte
→tx 0xb5be…b781 · 6 s
#or pay one-off over HTTP via x402.

SRC · DataStream.streamBroadcast

For developers

A few lines. Subscribed.

Drop the MCP server into any agent. Connect a wallet, subscribe to a feed, start reading data — settled per byte in USDC.

Reach it from

TypeScript / Node

byte-mcp-server (MCP)

live

Python

MCP client

live

Any HTTP client

x402 micropayments

live

Solidity (on-chain)

call DataStream / DataRegistry directly

any EVM

#npm i byte-mcp-server
 import { Client } from "@modelcontextprotocol/sdk";
 const c = new Client({ name: "agent" });
 await c.callTool("byte_subscribe", { feed: "weather" });
 const data = await c.callTool("byte_read", { feed: "weather" });
→{ payload, bytes, fee_usdc, tx }

byte-mcp-serverv0.7 on npm · the agent-native interface to PayPerBytebyte_subscribesubscribe a wallet to a feed and set a bounded USDC allowancebyte_readpull the latest payload; settles per byte in USDC, on-chain

Infrastructure

Boring stack. Bored on purpose.

An audited contract core. A battle-tested rollup. USDC for settlement. No new chain, no token.

Chain

Arbitrum

Sepolia testnet · One mainnet next

Settlement

~250 ms

sequencer finality

Payment

USDC

per-byte, settled on-chain

Pricing

$0.003

per call · KB-block

Access

MCP + x402

byte-mcp-server · HTTP 402

Contracts

3 core

Solidity 0.8.24 · Foundry

Catalog

21 live

first-party feeds + oracles

Status

Testnet

Arbitrum Sepolia

Mainnet waitlist

Be first in line when feeds reach mainnet.

PayPerByte is live on Arbitrum Sepolia testnet today — connect a wallet and try it now. Mainnet is audit-gated; join the waitlist and you'll be first to know when it opens.

No spam. One email when mainnet opens.