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name: rpc description: Use when the user needs raw blockchain JSON-RPC access — contract reads (eth_call), native balances, blocks, transactions, logs, gas estimates, or any chain-native RPC method across 40 chains. One endpoint per chain via BlockRun's Tatum-backed gateway, $0.0030 per call, no node, no API key. Prefer blockrun_price / blockrun_dex / the paid tools when they already cover the question. triggers:

• "rpc"
• "json-rpc"
• "eth_call"
• "contract read"
• "raw chain"
• "node access"
• "blockchain rpc"
• "getBalance"
• "block number"
• "transaction receipt"
• "event logs"
• "tatum"

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Multi-chain RPC — every supported chain, one tool

blockrun_rpc POSTs a standard JSON-RPC 2.0 body to /v1/rpc/{network}. Flat $0.0030 per call ($0.002 base + the $0.001 transaction fee). A JSON-RPC batch array charges per element but pays the flat fee only once — $0.002 × n + $0.001, so a batch of 3 costs $0.0070 where three separate calls cost $0.0090. Batch whenever you can. Settlement in USDC via x402. Responses are cached briefly server-side for identical read calls (X-Cache: HIT is free of upstream latency but still billed).

When to use which tool

Question	Tool
"What's ETH trading at?"	blockrun_price (free)
"PEPE/WETH pool liquidity?"	blockrun_dex (free)
"What's this wallet holding?"	blockrun_rpc (labels: no tool since Surf was retired 2026-09-06)
"Call balanceOf(0x...) on this ERC-20"	blockrun_rpc
"Latest block / tx receipt / event logs / gas price"	blockrun_rpc
"Solana account info / slot / signatures"	blockrun_rpc

Networks

EVM (use eth_* methods):

Key	Chain		Key	Chain
ethereum	Ethereum		zksync	zkSync Era
base	Base		berachain	Berachain
arbitrum	Arbitrum One		unichain	Unichain
arbitrum-nova	Arbitrum Nova		monad	Monad
optimism	Optimism		chiliz	Chiliz
polygon	Polygon		moonbeam	Moonbeam
bsc	BNB Smart Chain		aurora	Aurora
avalanche	Avalanche C-Chain		flare	Flare
fantom	Fantom		oasis	Oasis Sapphire
cronos	Cronos		kaia	Kaia (Klaytn)
celo	Celo		sonic	Sonic
gnosis	Gnosis		xdc	XDC Network
abstract	Abstract		hyperevm	HyperEVM
plume	Plume		ronin	Ronin
rootstock	Rootstock (RSK)

Non-EVM (chain-native methods):

Key	Chain	Method family
solana	Solana	getSlot, getBalance, getAccountInfo, getSignaturesForAddress
bitcoin	Bitcoin	getblockchaininfo, getblockcount, getrawtransaction
litecoin / dogecoin / bitcoin-cash / zcash	UTXO chains	Bitcoin-style RPC
near	NEAR	status, query
sui	Sui	sui_getLatestCheckpointSequenceNumber, suix_getBalance
ripple	XRP Ledger	account_info, ledger
polkadot / kusama	Substrate	chain_getHeader, state_getStorage

Unknown-but-wellformed slugs pass through to the Tatum gateway untouched — newly added chains work without an MCP update. A bad slug returns HTTP 400 with the supported list (no charge).

Recipes

ERC-20 balance (eth_call):

blockrun_rpc({
  network: "base",
  method: "eth_call",
  params: [{
    to: "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",   // USDC on Base
    data: "0x70a08231000000000000000000000000<ADDRESS_NO_0x_PADDED_TO_32B>"
  }, "latest"]
})

Native balance: method: "eth_getBalance", params: ["0x...", "latest"] Tx receipt: method: "eth_getTransactionReceipt", params: ["0x<txhash>"] Event logs: method: "eth_getLogs", params: [{ fromBlock, toBlock, address, topics }] — keep ranges small; huge ranges are rejected upstream (no charge). Gas: method: "eth_gasPrice" / eth_estimateGas

Solana token account: network: "solana", method: "getTokenAccountsByOwner", params: ["<owner>", {"mint": "<mint>"}, {"encoding": "jsonParsed"}]

Batch (charged per element, flat fee paid once — 3 calls = $0.0070, vs $0.0090 sent separately):

blockrun_rpc({ network: "ethereum", body: [
  { jsonrpc: "2.0", id: 1, method: "eth_blockNumber" },
  { jsonrpc: "2.0", id: 2, method: "eth_gasPrice" },
  { jsonrpc: "2.0", id: 3, method: "eth_chainId" }
]})

Failure semantics

• Upstream timeout / 5xx → no charge, retry safe.
• Malformed body / bad network → HTTP 400, no charge.
• JSON-RPC-level errors (e.g. revert on eth_call) come back inside result.error — the call is charged (the node did the work).