> ## Documentation Index
> Fetch the complete documentation index at: https://docs.chainstack.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Arc methods

> Complete reference of Arc JSON-RPC methods supported on Chainstack, with per-method availability for the eth, debug, trace, txpool, net, web3, and arc namespaces.

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](/docs/request-units#evm-methods-affected-by-block-age).

See also [interactive Arc API call examples](/reference/arc-getting-started).

Arc is an EVM-compatible layer 1 from Circle. It pairs the [Reth](https://github.com/paradigmxyz/reth) execution client with [Malachite](https://github.com/circlefin/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](https://github.com/circlefin/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.

## Arc namespace

Arc adds a custom `arc_*` namespace on top of the standard Reth surface:

* [`arc_getVersion`](/reference/arc-getversion) — returns the execution layer build information: `git_version`, `git_commit`, `git_short_hash`, and `cargo_version`.
* [`arc_getCertificate`](/reference/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.

<Note>
  `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.
</Note>

## 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](https://github.com/circlefin/arc-node) RPC middleware describes the intent as preventing a request that "would leak pending transaction data". See [What gives you mempool access](/docs/mempool-configuration#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.

## 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.

## 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](/docs/using-eth_getstorageat-instead-of-debug_storagerangeat-on-reth).

## Method availability

<Note>
  `eth_createAccessList` needs an explicit `gas` value in the call object. Without one it returns `-32000 intrinsic gas too high`.
</Note>

| Method | Availability | Comment |
| - | - | - |
| arc\_getCertificate | <Icon icon="square-check" iconType="solid" /> | |
| arc\_getVersion | <Icon icon="square-check" iconType="solid" /> | |
| debug\_accountRange | <Icon icon="xmark" iconType="solid" /> | registered but returns `null` on Reth |
| debug\_chaindbProperty | <Icon icon="xmark" iconType="solid" /> | returns `-32601` |
| debug\_codeByHash | <Icon icon="xmark" iconType="solid" /> | registered but returns `null` on Reth |
| debug\_dumpBlock | <Icon icon="xmark" iconType="solid" /> | returns `-32601` |
| debug\_getAccessibleState | <Icon icon="xmark" iconType="solid" /> | returns `-32601` |
| debug\_getBadBlocks | <Icon icon="square-check" iconType="solid" /> | returns an empty array |
| debug\_getModifiedAccountsByHash | <Icon icon="xmark" iconType="solid" /> | registered but returns `null` on Reth |
| debug\_getModifiedAccountsByNumber | <Icon icon="xmark" iconType="solid" /> | registered but returns `null` on Reth |
| debug\_getRawBlock | <Icon icon="square-check" iconType="solid" /> | |
| debug\_getRawHeader | <Icon icon="square-check" iconType="solid" /> | |
| debug\_getRawReceipts | <Icon icon="square-check" iconType="solid" /> | |
| debug\_getRawTransaction | <Icon icon="square-check" iconType="solid" /> | |
| debug\_getTrieFlushInterval | <Icon icon="xmark" iconType="solid" /> | not implemented by Reth |
| debug\_intermediateRoots | <Icon icon="xmark" iconType="solid" /> | registered but returns `null` on Reth |
| debug\_preimage | <Icon icon="xmark" iconType="solid" /> | registered but returns `null` on Reth |
| debug\_printBlock | <Icon icon="xmark" iconType="solid" /> | registered but returns `null` on Reth |
| debug\_storageRangeAt | <Icon icon="xmark" iconType="solid" /> | registered but returns `null` on Reth |
| debug\_traceBadBlock | <Icon icon="xmark" iconType="solid" /> | registered but returns `null` on Reth |
| debug\_traceBlockByHash | <Icon icon="square-check" iconType="solid" /> | |
| debug\_traceBlockByNumber | <Icon icon="square-check" iconType="solid" /> | |
| debug\_traceCall | <Icon icon="square-check" iconType="solid" /> | |
| debug\_traceTransaction | <Icon icon="square-check" iconType="solid" /> | |
| eth\_accounts | <Icon icon="square-check" iconType="solid" /> | returns an empty array — no unlocked accounts on a hosted node |
| eth\_blobBaseFee | <Icon icon="square-check" iconType="solid" /> | |
| eth\_blockNumber | <Icon icon="square-check" iconType="solid" /> | |
| eth\_call | <Icon icon="square-check" iconType="solid" /> | |
| eth\_chainId | <Icon icon="square-check" iconType="solid" /> | |
| eth\_coinbase | <Icon icon="xmark" iconType="solid" /> | not implemented by Reth — returns `-32603 unimplemented` |
| eth\_createAccessList | <Icon icon="square-check" iconType="solid" /> | pass an explicit `gas` value, otherwise it returns `-32000 intrinsic gas too high` |
| eth\_estimateGas | <Icon icon="square-check" iconType="solid" /> | |
| eth\_feeHistory | <Icon icon="square-check" iconType="solid" /> | |
| eth\_gasPrice | <Icon icon="square-check" iconType="solid" /> | |
| eth\_getAccount | <Icon icon="square-check" iconType="solid" /> | |
| eth\_getBalance | <Icon icon="square-check" iconType="solid" /> | |
| eth\_getBlockByHash | <Icon icon="square-check" iconType="solid" /> | |
| eth\_getBlockByNumber | <Icon icon="square-check" iconType="solid" /> | |
| eth\_getBlockReceipts | <Icon icon="square-check" iconType="solid" /> | |
| eth\_getBlockTransactionCountByHash | <Icon icon="square-check" iconType="solid" /> | |
| eth\_getBlockTransactionCountByNumber | <Icon icon="square-check" iconType="solid" /> | |
| eth\_getCode | <Icon icon="square-check" iconType="solid" /> | |
| eth\_getFilterChanges | <Icon icon="square-check" iconType="solid" /> | |
| eth\_getFilterLogs | <Icon icon="square-check" iconType="solid" /> | |
| eth\_getHeaderByHash | <Icon icon="square-check" iconType="solid" /> | |
| eth\_getHeaderByNumber | <Icon icon="square-check" iconType="solid" /> | |
| eth\_getLogs | <Icon icon="square-check" iconType="solid" /> | |
| eth\_getProof | <Icon icon="square-check" iconType="solid" /> | |
| eth\_getRawTransactionByHash | <Icon icon="square-check" iconType="solid" /> | |
| eth\_getStorageAt | <Icon icon="square-check" iconType="solid" /> | |
| eth\_getTransactionByBlockHashAndIndex | <Icon icon="square-check" iconType="solid" /> | |
| eth\_getTransactionByBlockNumberAndIndex | <Icon icon="square-check" iconType="solid" /> | |
| eth\_getTransactionByHash | <Icon icon="square-check" iconType="solid" /> | |
| eth\_getTransactionBySenderAndNonce | <Icon icon="xmark" iconType="solid" /> | Arc returns `null` — it reads the pool, which Arc does not expose |
| eth\_getTransactionCount | <Icon icon="square-check" iconType="solid" /> | |
| eth\_getTransactionReceipt | <Icon icon="square-check" iconType="solid" /> | |
| eth\_getUncleByBlockHashAndIndex | <Icon icon="square-check" iconType="solid" /> | always null — Arc has no uncles (BFT consensus) |
| eth\_getUncleByBlockNumberAndIndex | <Icon icon="square-check" iconType="solid" /> | always null — Arc has no uncles (BFT consensus) |
| eth\_getUncleCountByBlockHash | <Icon icon="square-check" iconType="solid" /> | |
| eth\_getUncleCountByBlockNumber | <Icon icon="square-check" iconType="solid" /> | |
| eth\_hashrate | <Icon icon="square-check" iconType="solid" /> | always `0x0` |
| eth\_maxPriorityFeePerGas | <Icon icon="square-check" iconType="solid" /> | |
| eth\_mining | <Icon icon="xmark" iconType="solid" /> | not implemented by Reth — returns `-32603 unimplemented` |
| eth\_newBlockFilter | <Icon icon="square-check" iconType="solid" /> | |
| eth\_newFilter | <Icon icon="square-check" iconType="solid" /> | |
| eth\_newPendingTransactionFilter | <Icon icon="xmark" iconType="solid" /> | pending-transaction visibility is disabled on Arc |
| eth\_protocolVersion | <Icon icon="square-check" iconType="solid" /> | |
| eth\_sendRawTransaction | <Icon icon="square-check" iconType="solid" /> | |
| eth\_sendRawTransactionSync | <Icon icon="square-check" iconType="solid" /> | |
| eth\_simulateV1 | <Icon icon="square-check" iconType="solid" /> | |
| eth\_subscribe | <Icon icon="square-check" iconType="solid" /> | WSS. `newHeads` and `logs` only — `newPendingTransactions` returns `-32001` |
| eth\_syncing | <Icon icon="square-check" iconType="solid" /> | |
| eth\_uninstallFilter | <Icon icon="square-check" iconType="solid" /> | |
| eth\_unsubscribe | <Icon icon="square-check" iconType="solid" /> | WSS |
| net\_listening | <Icon icon="square-check" iconType="solid" /> | |
| net\_peerCount | <Icon icon="square-check" iconType="solid" /> | |
| net\_version | <Icon icon="square-check" iconType="solid" /> | |
| rpc\_modules | <Icon icon="square-check" iconType="solid" /> | |
| trace\_block | <Icon icon="square-check" iconType="solid" /> | |
| trace\_call | <Icon icon="square-check" iconType="solid" /> | |
| trace\_callMany | <Icon icon="square-check" iconType="solid" /> | |
| trace\_filter | <Icon icon="square-check" iconType="solid" /> | |
| trace\_get | <Icon icon="square-check" iconType="solid" /> | |
| trace\_rawTransaction | <Icon icon="square-check" iconType="solid" /> | |
| trace\_replayBlockTransactions | <Icon icon="square-check" iconType="solid" /> | |
| trace\_replayTransaction | <Icon icon="square-check" iconType="solid" /> | |
| trace\_transaction | <Icon icon="square-check" iconType="solid" /> | |
| txpool\_content | <Icon icon="xmark" iconType="solid" /> | not available on Global Nodes and Trader Nodes — see [What gives you mempool access](/docs/mempool-configuration#what-gives-you-mempool-access) |
| txpool\_contentFrom | <Icon icon="xmark" iconType="solid" /> | not available on Global Nodes and Trader Nodes |
| txpool\_inspect | <Icon icon="xmark" iconType="solid" /> | not available on Global Nodes and Trader Nodes |
| txpool\_status | <Icon icon="square-check" iconType="solid" /> | |
| web3\_clientVersion | <Icon icon="square-check" iconType="solid" /> | |
| web3\_sha3 | <Icon icon="square-check" iconType="solid" /> | |