PayPerByte — per-byte data for AI agents: x402 USDC on Base, EIP-712-attested. No token.
| Endpoint | https://mcp.payperbyte.io/mcp (streamable-http) |
|---|---|
| Registry version | 0.13.0 |
| Now | 15 tools · grade C (71) · pin ts_5898ef5279065de8f6c4a48a96279894 · protocol 2025-06-18 |
| First / last listed | 2026-11-04 02:45 UTC / 2026-11-04 02:45 UTC |
| Grade over time | 2026-11-04: C (71), 15 tools |
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Tools: byte_search_publishers byte_get_publisher byte_get_network_stats byte_check_subscription byte_get_token_balances byte_list_feeds byte_list_my_subscriptions byte_subscription_health byte_unsubscribe byte_subscribe byte_register_publisher byte_publish_data byte_query_fact byte_buy_data byte_verify_payload
byte_search_publishers | Search PayPerByte publishers by topic and sort order. Returns publisher addresses, topics, subscriber counts, message counts, and price-per-KB. params: query, sortBy, limit |
byte_get_publisher | 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). params: address* |
byte_get_network_stats | Get PayPerByte network-wide statistics: total publishers, messages streamed, and total subscriber fees settled in USDC. params: none |
byte_check_subscription | Check if an address is subscribed to a specific publisher on PayPerByte. params: subscriber*, publisher* |
byte_get_token_balances | 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. params: address* |
byte_list_feeds | List all active data feeds in the PayPerByte catalog with topics, price-per-call, and frequency (pricePerKB is a deprecated alias). params: none |
byte_list_my_subscriptions | 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. params: subscriber*, indexerUrl |
byte_subscription_health | 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 subscrib params: publisher*, indexerUrl |
byte_unsubscribe | 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. params: publisher* |
byte_subscribe | 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_K params: publisher*, skipAllowance |
byte_register_publisher | 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. params: stake*, topic*, expectedSize*, maxSize*, frequency*, pricePerKB* |
byte_publish_data | 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. params: subscriber*, data*, maxFee* |
byte_query_fact | 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 params: question*, subscriber_address*, max_byte_cost, topic_filter, min_publisher_pqs, max_response_latency_ms |
byte_buy_data | 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_su params: feed*, body |
byte_verify_payload | 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. An params: data*, expectedHash, txHash, hashMode |
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