BlockchainQuery

BlockchainQuery is a Model Context Protocol (MCP) server that provides read-only blockchain querying across 63 chains and 7 protocol families. It’s built by PNF and powered by Pocket Network’s decentralized RPC infrastructure. Available as a Claude extension in .mcpb format, it lets AI assistants query live blockchain data directly.

What It Does

BlockchainQuery exposes 37 tools for querying blockchain state:

Balances — native token and ERC-20/SPL token balances
Transactions — transaction details, receipts, and signatures
Blocks — block data by height, hash, or latest
Tokens — ERC-20 metadata, multi-token price lookups
Staking — delegations, rewards, and validator info (Cosmos chains)
Governance — proposals and voting state (Cosmos chains)
Smart contracts — read-only contract calls (eth_call)
Event logs — filtered event log retrieval
Cross-chain — compare balances across multiple EVM chains simultaneously

Supported Chains

BlockchainQuery covers 7 protocol families:

Protocol	Chains	Example Queries
EVM	Ethereum, Polygon, Arbitrum, Base, Optimism, BSC, Avalanche, and many more	Balances, transactions, blocks, logs, contract calls, gas estimation
Solana	Solana mainnet	Account info, balances, transactions, block data, token accounts
Cosmos	Pocket Network, Cosmos Hub, Osmosis, and others	Balances, staking, governance, validators, blocks, transactions
NEAR	NEAR Protocol	Account queries, transactions, blocks, contract views
Radix	Radix mainnet	Balances, network status, consensus state, transactions
Sui	Sui mainnet	Object queries, balances, coin details, transactions
Tron	Tron mainnet	Balances, transactions, blocks

Use list_chains to see all available chains and their chain IDs.

How to Use

As a Claude Extension

BlockchainQuery is available as a .mcpb extension file, following Anthropic’s standard extension installation format. Download the .mcpb file from the GitHub repository and install it using Claude’s extension installer. A listing in Anthropic’s MCP directory is pending.

Once installed, Claude can query blockchain data directly in conversation:

“What’s the ETH balance of vitalik.eth?” “Show me the latest block on Pocket Network” “Compare my token balances across Ethereum, Polygon, and Arbitrum”

As an MCP Server

Developers can integrate BlockchainQuery into any MCP-compatible client:

plaintext

Repository: github.com/pokt-network/blockchain-query-mcp

All 37 tools are annotated with readOnlyHint: true — BlockchainQuery never modifies chain state or submits transactions.

Key Tools

Tool	Description
`list_chains`	List all 63 supported chains
`evm_get_balance`	Native coin balance for any EVM chain
`evm_get_token_info`	ERC-20 metadata (name, symbol, decimals, supply)
`evm_get_transaction`	Transaction details by hash
`evm_get_logs`	Filtered event logs
`evm_call_contract`	Read-only smart contract calls
`compare_balances`	Cross-chain balance comparison
`solana_get_balance`	SOL balance
`cosmos_get_balance`	Native/all token balances on Cosmos chains
`cosmos_get_staking`	Delegation and reward info
`resolve_domain`	ENS and Unstoppable Domains resolution
`convert_units`	Unit conversion (e.g., upokt → POKT, wei → ETH)

Privacy

BlockchainQuery queries only public blockchain data. It does not store queries, results, or user data. All operations are read-only. See the privacy policy for details.

AI Agents — using Pocket as an AI agent data layer
Supported Chains — full chain coverage list
API Portal — the RPC infrastructure powering BlockchainQuery