# \#question **URL:** https://collective.flashbots.net/tag/question/31.md [Latest](https://collective.flashbots.net/latest.md) · [Categories](https://collective.flashbots.net/categories.md) · [Tags](https://collective.flashbots.net/tags.md) --- ## [Panetière, frequently asked questions](https://collective.flashbots.net/t/panetiere-frequently-asked-questions/5904)
**Author:** [@guayabyte](https://collective.flashbots.net/u/guayabyte)\ **Replies:** 1\ **Last updated:** [September 18, 2026, 11:58am UTC](https://collective.flashbots.net/t/panetiere-frequently-asked-questions/5904 "2026-09-18T11:58:00Z")
What is panetière? Panetière is an anonymous broadcast protocol. In panetière, clients running in a trusted execution environment hold messages they want to publish and servers provide the service through which they c… --- ## [How do arbitrage bots discover AMM pools outside known factory lists?](https://collective.flashbots.net/t/how-do-arbitrage-bots-discover-amm-pools-outside-known-factory-lists/6007)
**Author:** [@Poolbase](https://collective.flashbots.net/u/Poolbase)\ **Replies:** 0\ **Last updated:** [September 10, 2026, 12:45pm UTC](https://collective.flashbots.net/t/how-do-arbitrage-bots-discover-amm-pools-outside-known-factory-lists/6007 "2026-09-10T12:45:21Z")
I’ve been investigating how difficult it is to build a comprehensive list of AMM pools across EVM chains. Factory registries work for known protocols, but they can miss clones, unusual implementations and chain-specific… --- ## [\[L2 MEV\] Are Intent-based Solvers killing Native On-Chain Arbitrage? (A Base Case Study)](https://collective.flashbots.net/t/l2-mev-are-intent-based-solvers-killing-native-on-chain-arbitrage-a-base-case-study/5667)
**Author:** [@GBLIN](https://collective.flashbots.net/u/GBLIN)\ **Replies:** 0\ **Last updated:** [April 22, 2026, 9:11am UTC](https://collective.flashbots.net/t/l2-mev-are-intent-based-solvers-killing-native-on-chain-arbitrage-a-base-case-study/5667 "2026-04-22T09:11:10Z")
Update (August 2026): the vault has since been redeployed. The address below is superseded — the current contract on Base is 0x36C81d7E1966310F305eA637e761Cf77F90852f0. The original post is left untouched; a four-month … --- ## [Can a CEX microstructure signal survive Ethereum execution latency and MEV?](https://collective.flashbots.net/t/can-a-cex-microstructure-signal-survive-ethereum-execution-latency-and-mev/5866)
**Author:** [@amlsl](https://collective.flashbots.net/u/amlsl)\ **Replies:** 0\ **Last updated:** [July 27, 2026, 11:42am UTC](https://collective.flashbots.net/t/can-a-cex-microstructure-signal-survive-ethereum-execution-latency-and-mev/5866 "2026-07-27T11:42:30Z")
Motivation We are investigating a narrow cross-venue market-microstructure question: Can a predictive signal generated from BTC and ETH perpetual trades on a centralized exchange reduce adverse selection when liquidity … --- ## [NonceTooLow error using eth\_sendPrivateTransaction](https://collective.flashbots.net/t/noncetoolow-error-using-eth-sendprivatetransaction/5735)
**Author:** [@JonFr](https://collective.flashbots.net/u/JonFr)\ **Replies:** 0\ **Last updated:** [May 27, 2026, 8:51am UTC](https://collective.flashbots.net/t/noncetoolow-error-using-eth-sendprivatetransaction/5735 "2026-05-27T08:51:12Z")
It looks like a simple problem where I just used the wrong nonce. But that’s not the case. As you can see, the wallet currently only has one transaction with a nonce of 0: https://etherscan.io/address/0x65f3ffef2ee2f9c7… --- ## [Pure Zig Ethereum library -- seeking feedback from searchers](https://collective.flashbots.net/t/pure-zig-ethereum-library-seeking-feedback-from-searchers/5592)
**Author:** [@kookamo](https://collective.flashbots.net/u/kookamo)\ **Replies:** 1\ **Last updated:** [March 8, 2026, 11:32am UTC](https://collective.flashbots.net/t/pure-zig-ethereum-library-seeking-feedback-from-searchers/5592 "2026-03-08T11:32:06Z")
Pure Zig Ethereum library – seeking feedback from searchers We’re building eth.zig, a zero-dependency Ethereum library in Zig. We benchmarked it against Alloy on the operations that sit on the tx construction hot path: … --- ## [From AA Execution Safety to Value Movement Recognition: A Proposal for Safer UX Boundaries](https://collective.flashbots.net/t/from-aa-execution-safety-to-value-movement-recognition-a-proposal-for-safer-ux-boundaries/5580)
**Author:** [@cancan007](https://collective.flashbots.net/u/cancan007)\ **Replies:** 0\ **Last updated:** [February 25, 2026, 8:38am UTC](https://collective.flashbots.net/t/from-aa-execution-safety-to-value-movement-recognition-a-proposal-for-safer-ux-boundaries/5580 "2026-02-25T08:38:05Z")
Hello Flashbots Collective, I’m a builder from Japan working on protocol/AA design and broader value-recognition models in Web3 systems. I’m interested in posting a discussion that connects: intent expression / execu… --- ## [Need Flashbots bundle help for EOA wallet drained by sweeper bot (170k USDT)](https://collective.flashbots.net/t/need-flashbots-bundle-help-for-eoa-wallet-drained-by-sweeper-bot-170k-usdt/5502)
**Author:** [@Signov](https://collective.flashbots.net/u/Signov)\ **Replies:** 1\ **Last updated:** [January 21, 2026, 1:31pm UTC](https://collective.flashbots.net/t/need-flashbots-bundle-help-for-eoa-wallet-drained-by-sweeper-bot-170k-usdt/5502 "2026-01-21T13:31:37Z")
Ethereum mainnet EOA wallet is compromised by a sweeper bot. About 170,000 USDT (official ERC20). No gas; any ETH funding gets drained instantly. I am looking for a Flashbots private bundle execution: ETH funding t… --- ## [The 6.99% without PBS](https://collective.flashbots.net/t/the-6-99-without-pbs/5283)
**Author:** [@wisdom](https://collective.flashbots.net/u/wisdom)\ **Replies:** 3\ **Last updated:** [September 22, 2025, 5:05pm UTC](https://collective.flashbots.net/t/the-6-99-without-pbs/5283 "2025-09-22T17:05:43Z")
i was inspired by @Data\_Always idea on ‘why are blocks built locally?’ I tried my best to answer that, as I’m still wrapping my head around it. did some data analysis too and hope the research helps. my research analysi… --- ## [Interview Study Eth Consensus Layer (call for interviewees)](https://collective.flashbots.net/t/interview-study-eth-consensus-layer-call-for-interviewees/5279)
**Author:** [@steeef](https://collective.flashbots.net/u/steeef)\ **Replies:** 0\ **Last updated:** [September 18, 2025, 4:15pm UTC](https://collective.flashbots.net/t/interview-study-eth-consensus-layer-call-for-interviewees/5279 "2025-09-18T16:15:35Z")
Hi all! I am a researcher at the University of Amsterdam, and I am currently working on a research project that is focused on the Ethereum consensus layer. More specifically, I aim to understand the decision-making proc… --- ## [MEV share order flow ](https://collective.flashbots.net/t/mev-share-order-flow/5249)
**Author:** [@turbobuilder](https://collective.flashbots.net/u/turbobuilder)\ **Replies:** 0\ **Last updated:** [September 9, 2025, 4:39pm UTC](https://collective.flashbots.net/t/mev-share-order-flow/5249 "2025-09-09T16:39:42Z")
Hi, We are a new block builder turbobuilder.xyz and have a PR out to register for MEV share orderflow for a few months Register turbobuilder by turbobuilder · Pull Request #35 · flashbots/dowg · GitHub Is that repo sti… --- ## [Measuring Relay performance(error rate)](https://collective.flashbots.net/t/measuring-relay-performance-error-rate/5173)
**Author:** [@LaraCroft](https://collective.flashbots.net/u/LaraCroft)\ **Replies:** 0\ **Last updated:** [August 12, 2025, 3:15pm UTC](https://collective.flashbots.net/t/measuring-relay-performance-error-rate/5173 "2025-08-12T15:15:15Z")
Hey guys, I’m currently working on a project where I’m trying to measure the performance of a few mainstream relays. So far I’ve been working with 2 relay api data endpoints; payload delivered and blocks delivered but I … --- ## [Sending bundled transactions in one block](https://collective.flashbots.net/t/sending-bundled-transactions-in-one-block/4644)
**Author:** [@CossackHexican](https://collective.flashbots.net/u/CossackHexican)\ **Replies:** 2\ **Last updated:** [May 23, 2025, 2:30pm UTC](https://collective.flashbots.net/t/sending-bundled-transactions-in-one-block/4644 "2025-05-23T14:30:05Z")
Hi! My name is Andrew. I am a software developer and am learning about web3 and Blockchain, specifically for Ethereum based chains. I have a specific issue that I am hoping someone here can help me with… I use PulseC… --- ## [4Bundle tx](https://collective.flashbots.net/t/4bundle-tx/4923)
**Author:** [@belalang](https://collective.flashbots.net/u/belalang)\ **Replies:** 0\ **Last updated:** [May 6, 2025, 6:59am UTC](https://collective.flashbots.net/t/4bundle-tx/4923 "2025-05-06T06:59:54Z")
i’m tryng to put 4 txs into a bundle: Send from a secure wallet ETH to your compromised wallet Call unlock from the compromised wallet Send the unlocked tokens to your secure wallet Send all remaining ETH to your secur… --- ## [Issue with sepolia](https://collective.flashbots.net/t/issue-with-sepolia/4754)
**Author:** [@PavelH](https://collective.flashbots.net/u/PavelH)\ **Replies:** 0\ **Last updated:** [March 10, 2025, 2:11pm UTC](https://collective.flashbots.net/t/issue-with-sepolia/4754 "2025-03-10T14:11:40Z")
Hi guys, I have a problem with sepolia testnet, I can’t send a test transaction, the simulation runs successfully but the transaction is not accepted. I have no idea why this is happening --- ## [Block builder error while sealing block err="not enough funds available"](https://collective.flashbots.net/t/block-builder-error-while-sealing-block-err-not-enough-funds-available/4610)
**Author:** [@kosalayb2](https://collective.flashbots.net/u/kosalayb2)\ **Replies:** 0\ **Last updated:** [January 16, 2025, 4:10pm UTC](https://collective.flashbots.net/t/block-builder-error-while-sealing-block-err-not-enough-funds-available/4610 "2025-01-16T16:10:11Z")
not sure, why I am getting this error in builder logs. I am trying to test a bock builder with Lighthouse in holesky test net. Any help is appreciated. Thanks. --- ## [Permissioned Auctions on Suave with Zero-Knowledge Proofs](https://collective.flashbots.net/t/permissioned-auctions-on-suave-with-zero-knowledge-proofs/4249)
**Author:** [@merkle\_haggard](https://collective.flashbots.net/u/merkle_haggard)\ **Replies:** 1\ **Last updated:** [December 23, 2024, 4:47pm UTC](https://collective.flashbots.net/t/permissioned-auctions-on-suave-with-zero-knowledge-proofs/4249 "2024-12-23T16:47:31Z")
Permissioned Auctions on Suave with Zero-Knowledge Proofs Has anyone integrated ZK verifiers into a SUAPP? An immediate use case for this architecture is privacy-preserving transaction authorization for SUAPP auctions. … --- ## [Flashbots Boost Mainnet Relay - Censor OFAC in 2024?](https://collective.flashbots.net/t/flashbots-boost-mainnet-relay-censor-ofac-in-2024/4213)
**Author:** [@Yonko](https://collective.flashbots.net/u/Yonko)\ **Replies:** 0\ **Last updated:** [December 5, 2024, 4:33am UTC](https://collective.flashbots.net/t/flashbots-boost-mainnet-relay-censor-ofac-in-2024/4213 "2024-12-05T04:33:32Z")
I have a simple question: Does the mainnet relay (https://boost-relay.flashbots.net/) censor OFAC transactions in 2024? If so, can someone point me to the github repo that this logic is stored in? --- ## [Transfer to Titan Builder](https://collective.flashbots.net/t/transfer-to-titan-builder/3365)
**Author:** [@0xDxice](https://collective.flashbots.net/u/0xDxice)\ **Replies:** 3\ **Last updated:** [December 4, 2024, 8:58pm UTC](https://collective.flashbots.net/t/transfer-to-titan-builder/3365 "2024-12-04T20:58:44Z")
Hello guys. Sorry for the extremely noobish question. I’m new here. I’ve seen this transaction: 0xaeda23d41e65e28827fa8ed949bfac9cbc8d43ccf8a3bada2b6e32cb689c9c29 And I can’t seem to grasp why base and priority gas are… --- ## [Flashbot MEV-blocks API Issue](https://collective.flashbots.net/t/flashbot-mev-blocks-api-issue/3987)
**Author:** [@mitsuha](https://collective.flashbots.net/u/mitsuha)\ **Replies:** 1\ **Last updated:** [November 25, 2024, 11:34am UTC](https://collective.flashbots.net/t/flashbot-mev-blocks-api-issue/3987 "2024-11-25T11:34:04Z")
The flashbots API appears to be down. I am getting a 521 server error when I trying to access it. Does anyone know when it will be back up? --- ## [Ethers send bundle failed](https://collective.flashbots.net/t/ethers-send-bundle-failed/3904)
**Author:** [@arespollo](https://collective.flashbots.net/u/arespollo)\ **Replies:** 2\ **Last updated:** [November 5, 2024, 12:45pm UTC](https://collective.flashbots.net/t/ethers-send-bundle-failed/3904 "2024-11-05T12:45:38Z")
I want to send a test tx bundle, but bundleReceipt always is 1, output is ‘Bundle not included’ My Code (use ethers 6): const { ethers } = require("ethers"); const { FlashbotsBundleProvider, } = require("@flashbots/e… --- ## [Will a Bundle with Conditional Logic Be Prioritized in PoS Block Construction?](https://collective.flashbots.net/t/will-a-bundle-with-conditional-logic-be-prioritized-in-pos-block-construction/3923)
**Author:** [@0xDxice](https://collective.flashbots.net/u/0xDxice)\ **Replies:** 0\ **Last updated:** [September 30, 2024, 6:18pm UTC](https://collective.flashbots.net/t/will-a-bundle-with-conditional-logic-be-prioritized-in-pos-block-construction/3923 "2024-09-30T18:18:19Z")
After the transition to Proof of Stake (PoS), bundles are no longer guaranteed to be placed at the start of a block; instead, they can be placed anywhere within the block, and there’s no general method to ensure they are… --- ## [Flashbot RPC for Fantom](https://collective.flashbots.net/t/flashbot-rpc-for-fantom/3862)
**Author:** [@itprocity](https://collective.flashbots.net/u/itprocity)\ **Replies:** 0\ **Last updated:** [September 23, 2024, 8:06pm UTC](https://collective.flashbots.net/t/flashbot-rpc-for-fantom/3862 "2024-09-23T20:06:31Z")
I have a sweeper bot running in my fantom wallet. Please I need Flashbot RPC for fantom so I can rescue my tokens by sending bundled transactions. I don’t if fantom network is supported. Please I need help --- ## [Random error: "mev-share service error"](https://collective.flashbots.net/t/random-error-mev-share-service-error/3857)
**Author:** [@bombellos](https://collective.flashbots.net/u/bombellos)\ **Replies:** 0\ **Last updated:** [September 20, 2024, 11:23am UTC](https://collective.flashbots.net/t/random-error-mev-share-service-error/3857 "2024-09-20T11:23:14Z")
Hey, I started using flashbots recently and from time to time I’m getting the following error from the RPC when trying to submit the bundle. I specified all builders from this list. It’s worth noting that this error appe… --- ## [Post Request to Sepolia Testnet fails when trying to simulate the bundled transaction using flashbotsProvider.simulate()](https://collective.flashbots.net/t/post-request-to-sepolia-testnet-fails-when-trying-to-simulate-the-bundled-transaction-using-flashbotsprovider-simulate/1969)
**Author:** [@krishpatel](https://collective.flashbots.net/u/krishpatel)\ **Replies:** 2\ **Last updated:** [September 18, 2024, 1:01am UTC](https://collective.flashbots.net/t/post-request-to-sepolia-testnet-fails-when-trying-to-simulate-the-bundled-transaction-using-flashbotsprovider-simulate/1969 "2024-09-18T01:01:07Z")
I was practicing sending bundles on "“https://relay-sepolia.flashbots.net” which is sepolia testnet. However, everything I do worked fined, bundles were signed properly and transactions seemed right until I try to simula… --- ## [Sepolia testnet: coinbase.transfer does not work](https://collective.flashbots.net/t/sepolia-testnet-coinbase-transfer-does-not-work/3849)
**Author:** [@akitotoken](https://collective.flashbots.net/u/akitotoken)\ **Replies:** 1\ **Last updated:** [September 17, 2024, 6:46pm UTC](https://collective.flashbots.net/t/sepolia-testnet-coinbase-transfer-does-not-work/3849 "2024-09-17T18:46:42Z")
Hello everyone, we have submitted few transactions to sepolia via mev\_sendBundle, it was like sandwich, but the middle transaction did coinbase.transfer, but it was not lended out of sandwich (first), why? expected 0 1 … --- ## [How Flashbots prioritize the bundles with same nonce?](https://collective.flashbots.net/t/how-flashbots-prioritize-the-bundles-with-same-nonce/3839)
**Author:** [@blockson](https://collective.flashbots.net/u/blockson)\ **Replies:** 0\ **Last updated:** [September 13, 2024, 1:02pm UTC](https://collective.flashbots.net/t/how-flashbots-prioritize-the-bundles-with-same-nonce/3839 "2024-09-13T13:02:18Z")
Im researching the scenario when I have to outrun the hacker, who is draining the compromised pkey. So when its time to make a tx, he send the bundle to Flashbots. But also I send the bundle with the same nonce. Are th… --- ## [The method eth\_callBundle does not exist/is not available](https://collective.flashbots.net/t/the-method-eth-callbundle-does-not-exist-is-not-available/3822)
**Author:** [@zeke](https://collective.flashbots.net/u/zeke)\ **Replies:** 0\ **Last updated:** [September 5, 2024, 1:18am UTC](https://collective.flashbots.net/t/the-method-eth-callbundle-does-not-exist-is-not-available/3822 "2024-09-05T01:18:22Z")
I am trying to implement flashbots when sending transactions and I am getting: the method eth\_callBundle does not exist/is not available. This when I use https://builder0x69.io/ as my relay. When I use https://relay.fla… --- ## [Question: Is it worthwhile to start operating a new relay at this point?](https://collective.flashbots.net/t/question-is-it-worthwhile-to-start-operating-a-new-relay-at-this-point/3807)
**Author:** [@nana](https://collective.flashbots.net/u/nana)\ **Replies:** 3\ **Last updated:** [August 30, 2024, 12:27pm UTC](https://collective.flashbots.net/t/question-is-it-worthwhile-to-start-operating-a-new-relay-at-this-point/3807 "2024-08-30T12:27:02Z")
I’m considering operating a neutral relay, but is it actually worth the effort, or how does the community view this? Flashbots has announced TEE-Boost. There are also discussions about Preconfirmation and PROF. Regardin… --- ## [Block consumer URL is empty. Built block data reporting is essentially disabled](https://collective.flashbots.net/t/block-consumer-url-is-empty-built-block-data-reporting-is-essentially-disabled/3806)
**Author:** [@Kosala](https://collective.flashbots.net/u/Kosala)\ **Replies:** 0\ **Last updated:** [August 29, 2024, 8:02am UTC](https://collective.flashbots.net/t/block-consumer-url-is-empty-built-block-data-reporting-is-essentially-disabled/3806 "2024-08-29T08:02:23Z")
I am getting the above WARN, when I start the flashbots block builder. I am running the latest image of the flashbots builder and lighthouse as the consensus client. Why I am getting this warning ? Am I missing any requi… [Next page](https://collective.flashbots.net/tag/question/31.md?match_all_tags=true&page=1&tags%5B%5D=question)