Byte Protocol MCP server

• byte_buy_datawrite actionFree

  Buy a single data packet from any PayPerByte feed via the x402 payment gateway. No subscription, no allowance, no prior on-chain setup — pay-per-call USDC settlement. The MCP server signs an EIP-3009 transferWithAuthorization on behalf of the wallet whose PRIVATE_KEY is configured, the x402 facilitator submits the tx, and the data comes back inline with the on-chain settlement tx hash. Use byte_subscribe instead if you want a continuous stream of broadcasts from a publisher. The catalog of available feed slugs lives at https://x402.payperbyte.io/feeds (free GET). GET data feeds (weather, earthquakes, …) need only `feed`; the 10 POST oracles — runtime-eol, threat-intel, address-reputation, pkg-verdict, sanctions-screen, reasoning-verdict, merchant-screen, positioning-snapshot, cctp-attestation-latency, regime-signal — additionally require a JSON `body` (the query) — supplying `body` switches this call to POST. Requires PRIVATE_KEY env var on the MCP server and USDC on the configured wallet. NOTE: paid feeds settle REAL USDC on Base mainnet (eip155:8453) — the exact price is quoted in the 402 challenge and listed per feed at https://x402.payperbyte.io/feeds — the signed EIP-712 attestation over the exact response bytes proves delivery, not that a verdict itself is correct. Use a dedicated wallet holding only what you intend to spend.

• byte_check_subscriptionFree

  Check if an address is subscribed to a specific publisher on PayPerByte.

• byte_get_network_statsFree

  Get PayPerByte network-wide statistics: total publishers, messages streamed, and total subscriber fees settled in USDC.

• byte_get_publisherFree

  Get on-chain info for a specific PayPerByte publisher: status, subscriber and message counts, USDC revenue, and the registered schema (size bounds, cadence, price-per-KB).

• byte_get_token_balancesFree

  Get USDC and ETH balances for an address on Arbitrum Sepolia (the on-chain testnet layer — MockUSDC settles subscriptions and fact-oracle queries there). Does NOT show the Base-mainnet USDC balance that byte_buy_data spends.

• byte_list_feedsFree

  List all active data feeds in the PayPerByte catalog with topics, price-per-call, and frequency (pricePerKB is a deprecated alias).

• byte_list_my_subscriptionsFree

  List every active subscription for a given wallet address. Each entry has the publisher address, topic, status, when you subscribed, messages received in 7/30 days, USDC spent in 7/30 days, and the timestamp of the last message received. Use this to see what you're currently paying for and decide whether to unsubscribe.

• byte_publish_datawrite actionFree

  Publish data to a subscriber via the PayPerByte DataStream contract. Hashes the payload, records size on-chain, and settles the fee in USDC. Requires PRIVATE_KEY.

• byte_query_factFree

  Query a PayPerByte fact-oracle publisher for a signed answer with citations. Posts the question to a registered fact-oracle publisher (topic='fact-oracle'), waits for the on-chain BroadcastStreamed response, and returns the answer plus structured citation URLs. The signed receipt proves which publisher produced the answer (provenance + tamper-evidence), NOT that the answer is correct — ground your output in the cited sources, not in a truth guarantee. Availability: this requires a registered fact-oracle publisher actively broadcasting; if none is live the call returns a timeout rather than an answer.

• byte_register_publisherFree

  Register as a data publisher on PayPerByte. Registers a schema and the publisher on-chain. Requires PRIVATE_KEY. PayPerByte v1 publishers are first-party and unstaked — leave stake at '0'; a non-zero USDC stake is approved to DataRegistry first if you choose to post one.

• byte_search_publishersFree

  Search PayPerByte publishers by topic and sort order. Returns publisher addresses, topics, subscriber counts, message counts, and price-per-KB.

• byte_subscribeFree

  Subscribe to a PayPerByte publisher's data feed. By default also sets USDC allowance to DataStreamLib to type(uint256).max so the subscription doesn't silently lose payments when allowance depletes (the contract's allowance-skip path emits DataStreamed with amount=0 on transferFrom failure rather than reverting). Pass skipAllowance: true to opt out and set a finite cap manually. Requires PRIVATE_KEY.

• byte_subscription_healthFree

  Get the content-drift signal for a publisher. Compares their last 7 days of publishing activity (cadence, message count) against their 23-day baseline (days 8-30). Returns 'stable' (steady publishing), 'moderate' (20-50% cadence shift or 24-48h silence), 'significant' (>50% shift or >48h silence), or 'unknown' (new publisher, insufficient baseline). Use this to detect when a publisher you subscribe to has pivoted content or gone dormant.

• byte_unsubscribeFree

  Unsubscribe from a publisher's data feed. Takes effect next block: no more billing, no more data flow. Reversible — you can resubscribe later via byte_subscribe. Use this when a publisher has pivoted content (check with byte_subscription_health first) or when you simply don't want the feed anymore. Requires PRIVATE_KEY for the connected wallet.

• byte_verify_payloadFree

  Verify-before-act: confirm a data payload an agent is about to act on actually matches what the publisher cryptographically attested to on-chain. Recomputes keccak256 of the received bytes and compares it to the on-chain EIP-712 PayloadAttestation hash. ALWAYS call this on BYTE-sourced data before acting on it; if verified=false the bytes were tampered/corrupted in transit and MUST NOT be used. Anchor the check with EITHER expectedHash (an on-chain payloadHash you already hold, e.g. from byte_query_fact / byte_buy_data) OR txHash (the settlement tx — also recovers the attestation signer and confirms it is the named publisher). Read-only; no wallet or payment required.

• Code scan13 source files scanned25/25
• Live reliabilityremote reachable in 794ms20/20
• Tool poisoning15 tool descriptions checked15/15
• Auth qualityopen endpoint exposes 2 write-action tools with no auth3/15
• Maintenancelast push 7 days ago15/15
• Maintainer identityregistry namespace matches repository owner6/10

Byte Protocol: common questions

Is Byte Protocol MCP server safe?

Mostly: it is graded B (84/100). Read the Byte Protocol safety report

How do I install Byte Protocol?

It runs remotely at mcp.payperbyte.io. Add it to Claude Code, Claude Desktop or Cursor with the snippets above, or call it through the mcp.market gateway without installing anything.

Does Byte Protocol need an API key?

Yes. The registry entry asks for PRIVATE_KEY.

Is Byte Protocol maintained?

The last commit was 8 days ago (2026-09-13). The latest release is v0.13.0.

Is Byte Protocol up?

100% of our last 6 checks got an answer. We check remote servers about four times a day.