rpc

Apps & Automation

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, $0.002 per call, no node, no API key. Prefer blockrun_price / blockrun_dex / blockrun_surf when they already cover the question.

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Multi-chain RPC — 40+ chains, one tool

blockrun_rpc POSTs a standard JSON-RPC 2.0 body to /v1/rpc/{network}. Flat $0.002 per call; a JSON-RPC batch array charges per element. 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 labeled as / holding?"	`blockrun_surf`
"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 — 3 calls = $0.006):

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).