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Chainstack plans to deprecate Trader Nodes on December 1, 2026. We recommend moving your workloads to Global Nodes before then, as described in Trader Node deprecation.
Our pricing is simple: 1 RU per full request, 2 RUs per archive. For which EVM methods are full vs archive, see Request units — EVM methods affected by block age. See also interactive Arc API call examples. Arc is an EVM-compatible layer 1 from Circle. It pairs the Reth execution client with Malachite BFT consensus, and it uses USDC for gas. Chainstack serves Arc Mainnet (chain ID 5042) and Arc Testnet (chain ID 5042002). Both networks run the same arc-node software, which is what enforces the restrictions described on this page. The availability below applies to Arc Mainnet and Arc Testnet on Global Nodes.

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Arc namespace

Arc adds a custom arc_* namespace on top of the standard Reth surface:
  • arc_getVersion — returns the execution layer build information: git_version, git_commit, git_short_hash, and cargo_version.
  • arc_getCertificate — takes a block height and returns the consensus commit certificate for that height: the round, the block hash, and the validator signatures. This is the finality proof for a block.
rpc_modules does not list arc in its response, because the namespace is registered outside the standard module registry. The methods work regardless — do not use rpc_modules to decide whether they are available.

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Pending transactions are not available

Arc disables pending-transaction visibility. Both eth_newPendingTransactionFilter and eth_subscribe("newPendingTransactions") return -32001, with Pending transaction filters are not allowed and Subscriptions to pending transactions are not allowed respectively. Two more methods are blocked for the same reason, and these return null rather than an error, so they fail quietly:
  • eth_getBlockByNumber("pending") — other block tags work normally.
  • eth_getTransactionBySenderAndNonce — it answers from the pool.
All of this is enforced by Arc’s own node software rather than by Chainstack. The arc-node RPC middleware describes the intent as preventing a request that “would leak pending transaction data”. See What gives you mempool access for how this compares with the other EVM chains. txpool_status works, so you can read the pool’s pending and queued transaction counts. txpool_content, txpool_contentFrom, and txpool_inspect return -32601, because Global Nodes and Trader Nodes do not serve them on any EVM chain.

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Block time and archive billing

Arc produces a block roughly every 0.5 seconds. The standard EVM rule — 127 or more blocks behind the tip bills as archive — therefore covers only about a minute of history, against roughly 25 minutes on Ethereum. On Arc, expect most historical queries to bill as archive.

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Legacy debug methods

Reth registers a number of Geth-era debug_* methods but returns null for them rather than an error. They are marked as unavailable below, because a null response carries no data. Use debug_traceTransaction, debug_traceBlockByNumber, debug_traceBlockByHash, and debug_traceCall instead, or eth_getStorageAt in place of debug_storageRangeAt — see Using eth_getStorageAt instead of debug_storageRangeAt on Reth.

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Method availability

eth_createAccessList needs an explicit gas value in the call object. Without one it returns -32000 intrinsic gas too high.
Last modified on October 16, 2026