Call ANY JSON-RPC method on a supported chain: the escape hatch beyond the routed tools (eth_call, eth_estimateGas, eth_getCode, debug_trace*, trace_*). Prefer getTransaction/getLogs/getBlock where they fit. TORPC tier is negotiated per call (contract 2); check _meta.tier.
This is a read/data tool, never a wallet. It REFUSES anything that would change state, on every chain family: transaction broadcast and signing (eth_sendRawTransaction, MEV bundle/private-tx, personal_*/eth_sign*, Solana sendTransaction/requestAirdrop, BTC sendrawtransaction and bumpfee/psbtbumpfee, Sui sui_executeTransactionBlock, XRPL submit, Tron broadcasttransaction/createtransaction/triggersmartcontract, Cosmos broadcast_tx_*); transaction BUILDING, which returns an unsigned transaction rather than sending one (Sui's unsafe_* namespace); node administration and dev-node state (admin_*, miner_*, personal_*, hardhat_*, anvil_*, evm_*, engine_*); any mutating verb (set*, write*, start*, stop*, compact*), which refuses settxfee, debug_setHead and debug_writeBlockProfile; the node-operation half of geth's debug namespace (profilers, chaindb compaction, file-writing traces), which the verb rule cannot reach when the mutating word sits mid-camelCase; bitcoind's node and wallet state controls (invalidateblock, reconsiderblock, preciousblock, pruneblockchain, rescanblockchain, abortrescan, generateblock); and, on dot-namespaced chains, mempool submission and the node's own wallet, multisig and administration families (Filecoin.MpoolPush, Filecoin.WalletExport). Sign and send with your own wallet or signer.
On sui this tool speaks gRPC, not JSON-RPC: a bridged method is answered there, any other is REFUSED rather than sent to Sui's JSON-RPC, which Sui removes in mid-October 2026. describeMethods says which are bridged.
Everything else is FORWARDED: this tool keeps no list of permitted reads, because which methods exist is decided per chain by the endpoint's blockchain schema and what you may call by your tenant. A forwarded read can still come back refused ("Method disabled, reason: restricted by blockchain schema") — that is the authoritative answer. Call listChains for coverage.