> ## 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. ## Submitting Feedback If you encounter incorrect, outdated, or confusing documentation on this page, submit feedback: POST https://docs.chainstack.com/feedback ```json { "path": "/docs/mempool-configuration", "feedback": "Description of the issue" } ``` Only submit feedback when you have something specific and actionable to report. # Mempool configurations > Configure mempool access on your Chainstack nodes for pending transaction monitoring, MEV research, and real-time transaction pool data on EVM networks. Mempool configurations vary wildly across different protocols & node client configurations. The table here is a maintained reference of mempool configurations & specifics across all the protocols that Chainstack supports. The table structure: * Protocol — protocol name. * Protocol availability — details of the mempool availability on the protocol level. * Chainstack availability — how to access the protocol's mempool on Chainstack. * Client configuration — the default node client configuration for the mempool as deployed at Chainstack. * Example — a simple curl example. Remember to replace YOUR\_CHAINSTACK\_NODE with your Chainstack node endpoint for that particular protocol. Remember that whatever the default configuration, we can always [customize](/docs/features-availability-across-subscription-plans#node-customization) it for you on a [dedicated node](/docs/dedicated-node) . | Protocol | Protocol availability | Chainstack availability | Client configuration | Example | | --------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | -------------------------------------------------------------------------------------------------- | ----------------------------------------------------------- | ------------------------------------------------------ | | Ethereum | Available to everyone | [Archive](/docs/protocols-modes-and-types) with [Debug and trace APIs](/docs/debug-and-trace-apis) | 4096 pending transactions | [Ethereum txpool\_content](#ethereum-txpool_content) | | Polygon | Available to everyone | [Archive](/docs/protocols-modes-and-types) with [Debug and trace APIs](/docs/debug-and-trace-apis) | 4096 pending transactions | [Polygon txpool\_content](#polygon-txpool_content) | | BNB Smart Chain | Available to everyone | [Archive](/docs/protocols-modes-and-types) with [Debug and trace APIs](/docs/debug-and-trace-apis) | 4096 pending transactions | [BSC txpool\_content](#bsc-txpool_content) | | Base | [Private to Sequencer](https://github.com/base-org/node/issues/78). | N/A | N/A | N/A | | Avalanche | [Available only to validators](https://support.avax.network/en/articles/6158842-nodes-faq). | Not available on Chainstack | N/A | N/A | | TON | External messages are available in mempool | Available | | | | Arbitrum | No mempool. Only [Sequencer FIFO](https://docs.arbitrum.io/learn-more/faq#does-arbitrum-have-a-mempool). | N/A | N/A | N/A | | zkSync Era | Sequencer only | N/A | N/A | N/A | | Polygon zkEVM | Sequencer only | N/A | N/A | N/A | | Optimism | [Private to Sequencer](https://docs.optimism.io/stack/differences#mempool-rules) | N/A | N/A | N/A | | Oasis Saphire | [Confidential mempool](https://oasisprotocol.org/blog/web3-mev-protection) | N/A | N/A | N/A | | NEAR | [No mempool](https://gov.near.org/t/transaction-fee-discussion/58) | N/A | N/A | N/A | | Aurora | [No mempool](https://gov.near.org/t/transaction-fee-discussion/58) | N/A | N/A | N/A | | Solana | [No mempool](https://docs.solana.com/integrations/retrying-transactions) | N/A | N/A | N/A | | Scroll | [Publicly available through Sequencer](https://docs.scroll.io/en/technology/chain/rollup/). | N/A | N/A | N/A | | Ronin | Available to everyone | Not available on Chainstack | N/A | N/A | | Aptos | [Available to everyone](https://aptos.dev/concepts/validator-nodes#mempool) but there is no [transaction stream](https://github.com/aptos-labs/aptos-core/issues/5200) | [Full or archive node deployment](/docs/protocols-modes-and-types) | N/A | N/A | | Gnosis Chain | Available to everyone | On a [dedicated node](/docs/dedicated-node). | Any configuration | [Gnosis txpool\_content](#gnosis-txpool_content) | | Cronos | No mempool. [Only Sequencer FIFO](https://docs.cronos.org/cronos-chain-protocol/cronos-general-faq#if-i-increase-the-gas-price-does-it-help-to-speed-up-my-transaction). | N/A | N/A | N/A | | Filecoin | Available to everyone | [Full node deployment](/docs/protocols-modes-and-types) | 20,000 pending messages | [Filecoin MpoolPending](#filecoin-mpoolpending) | | Sonic | Available to everyone | On a [dedicated node](/docs/dedicated-node) | 4096 pending transactions | `txpool_*` | | Fantom | Available to everyone | On a [dedicated node](/docs/dedicated-node) | 4096 pending transactions | `txpool_*` | | TRON | Available to everyone | On a [dedicated node](/docs/dedicated-node) | 4096 pending transactions | `txpool_*` | | Starknet | Private to Sequencer | N/A | N/A | N/A | | Tezos | Available to everyone | [Full or archive node deployment](/docs/protocols-modes-and-types) | 240 blocks | [Tezos pending\_operations](#tezos-pending_operations) | | Bitcoin | Available to everyone | [Full node deployment](/docs/protocols-modes-and-types) | mempool size: 300 MB mempool tx expiry: 336 hours (14 days) | [Bitcoin getrawmempool](#bitcoin-getrawmempool) | ## Ethereum txpool\_content ```bash Shell theme={"system"} curl -X POST \ -H "Content-Type: application/json" \ --data '{"jsonrpc":"2.0","method":"txpool_content","params":[],"id":1}' \ YOUR_CHAINSTACK_NODE ``` ## Polygon txpool\_content ```bash Shell theme={"system"} curl -X POST \ -H "Content-Type: application/json" \ --data '{"jsonrpc":"2.0","method":"txpool_content","params":[],"id":1}' \ YOUR_CHAINSTACK_NODE ``` ## BSC txpool\_content ```bash Shell theme={"system"} curl -X POST \ -H "Content-Type: application/json" \ --data '{"jsonrpc":"2.0","method":"txpool_content","params":[],"id":1}' \ YOUR_CHAINSTACK_NODE ``` ## Gnosis txpool\_content ```bash Shell theme={"system"} curl -X POST \ -H "Content-Type: application/json" \ --data '{"jsonrpc":"2.0","method":"txpool_content","params":[],"id":1}' \ YOUR_CHAINSTACK_NODE ``` ## Filecoin MpoolPending ```bash Shell theme={"system"} curl -X POST \ -H "Content-Type: application/json" \ --data '{ "jsonrpc": "2.0", "method": "Filecoin.MpoolPending", "params": [null], "id": 1 }' \ YOUR_CHAINSTACK_NODE ``` ## Fantom txpool\_content ```bash Shell theme={"system"} curl -X POST \ -H "Content-Type: application/json" \ --data '{"jsonrpc":"2.0","method":"txpool_content","params":[],"id":1}' \ YOUR_CHAINSTACK_NODE ``` ## Tezos pending\_operations ```bash Shell theme={"system"} curl -X GET "YOUR_CHAINSTACK_NODE/chains/main/mempool/pending_operations" ``` ## Bitcoin getrawmempool ```bash Shell theme={"system"} curl -X POST \ -H "Content-Type: application/json" \ --data '{"jsonrpc": "2.0", "id":"curltest", "method": "getrawmempool", "params": [] }' \ YOUR_CHAINSTACK_NODE ``` Ake Director of Developer Experience @ Chainstack
Talk to me all things Web3
20 years in technology | 8+ years in Web3 full time years experience