### Author:  [@guayabyte](https://collective.flashbots.net/u/guayabyte)
#### Post date: [September 5, 2022, 6:56pm UTC](https://collective.flashbots.net/t/do-you-want-to-run-a-builder/212/1 "2022-09-05T18:56:39Z")
If so, please tell us more here:
>
>
> So, we heard you want to run a builder! Tell us more :)
>
> The \[builder API spec…ification\](https://ethereum.github.io/builder-specs/) is open and every validator can select their own builders. However, there are still open questions that we need to resolve with the humans in the ethereum ecosystem to get a permissionless and fully decentralized design. Following \[the plan\](https://github.com/flashbots/mev-boost/wiki/The-Plan-(tm)) towards proposer/builder separation we are \[researching and prototyping\](https://github.com/flashbots/mev-boost/wiki/Research) solutions for decentralization. Coming next is the addition of independent block builders to the Flashbots relay. You can find the initial \[Relay API specification here\](https://flashbots.notion.site/Relay-API-Spec-5fb0819366954962bc02e81cb33840f5), which outlines how builders can interact with the Flashbots Relay.
>
> Tell us more about who you are, what is your role in the ecosystem, how will you profit from running a builder, how are you going to contribute to answer the \[open questions\](https://github.com/flashbots/mev-boost/wiki/Research#open-questions), in order to get us to the trustless proposer/builder separation. Leave a comment in this issue so we can talk about collaboration.
---
### Author:  [@vishal](https://collective.flashbots.net/u/vishal)
#### Post date: [September 10, 2022, 11:03pm UTC](https://collective.flashbots.net/t/do-you-want-to-run-a-builder/212/2 "2022-09-10T23:03:30Z")
Yes I am interested. I find playing with Ethereum ecosystem very exciting. What software I need to build my own builder ? I see lots of documentation around but I am more of a install the SW , roll up the sleeves and learn.
---
### Author:  [@guayabyte](https://collective.flashbots.net/u/guayabyte)
#### Post date: [September 12, 2022, 2:01pm UTC](https://collective.flashbots.net/t/do-you-want-to-run-a-builder/212/3 "2022-09-12T14:01:28Z")
Hello @vishal. See here: [GitHub - flashbots/boost-geth-builder: Example builder](https://collective.flashbots.net/t/github-flashbots-boost-geth-builder-example-builder/139)
You can ask your questions, if any, in that thread.
---
### Author:  [@vishal](https://collective.flashbots.net/u/vishal)
#### Post date: [September 12, 2022, 11:11pm UTC](https://collective.flashbots.net/t/do-you-want-to-run-a-builder/212/4 "2022-09-12T23:11:23Z")
Thank you.
---
### Author:  [@metachris](https://collective.flashbots.net/u/metachris)
#### Post date: [September 13, 2022, 8:39am UTC](https://collective.flashbots.net/t/do-you-want-to-run-a-builder/212/5 "2022-09-13T08:39:36Z")
In addition to our Goerli relay, **we’ve now also opened block submissions on our [Sepolia relay](https://builder-relay-sepolia.flashbots.net/)** (where our relay delivers about 1 in 5 blocks).
**Sepolia relay block submission endpoints:**
- `getValidators`: [https://builder-relay-sepolia.flashbots.net/relay/v1/builder/validators](https://builder-relay-sepolia.flashbots.net/relay/v1/builder/validators) (GET) - array of proposer preferences for registered validators with assigned duties in the current and next epoch
- `submitBlock`: [https://builder-relay-sepolia.flashbots.net/relay/v1/builder/blocks](https://builder-relay-sepolia.flashbots.net/relay/v1/builder/blocks) (POST)
**Goerli relay block submission endpoints:**
- `getValidators`: [https://builder-relay-goerli.flashbots.net/relay/v1/builder/validators](https://builder-relay-goerli.flashbots.net/relay/v1/builder/validators) (GET) - array of proposer preferences for registered validators with assigned duties in the current and next epoch
- `submitBlock`: [https://builder-relay-goerli.flashbots.net/relay/v1/builder/blocks](https://builder-relay-goerli.flashbots.net/relay/v1/builder/blocks) (POST)
**See also:**
- [Relay API documentation - Block Builder API](https://bit.ly/3BmGZ3T)
* * *
Note: Submissions are currently rate-limited to 60 requests / minute / IP address.
---
### Author:  [@metachris](https://collective.flashbots.net/u/metachris)
#### Post date: [September 13, 2022, 8:40am UTC](https://collective.flashbots.net/t/do-you-want-to-run-a-builder/212/6 "2022-09-13T08:40:53Z")
Btw, the Flashbots mainnet relay will also allow external builder submissions from the get-go (the merge), in the same way as our testnet relays.
---
### Author:  [@metachris](https://collective.flashbots.net/u/metachris)
#### Post date: [September 14, 2022, 9:26am UTC](https://collective.flashbots.net/t/do-you-want-to-run-a-builder/212/7 "2022-09-14T09:26:54Z")
**Mainnet relay block submission endpoints:**
- `getValidators`: [https://boost-relay.flashbots.net/relay/v1/builder/validators](https://boost-relay.flashbots.net/relay/v1/builder/validators) (GET) - array of proposer preferences for registered validators with assigned duties in the current and next epoch
- `submitBlock`: [https://boost-relay.flashbots.net/relay/v1/builder/blocks](https://boost-relay.flashbots.net/relay/v1/builder/blocks) (POST)
---
### Author:  [@grust](https://collective.flashbots.net/u/grust)
#### Post date: [September 27, 2022, 12:57pm UTC](https://collective.flashbots.net/t/do-you-want-to-run-a-builder/212/8 "2022-09-27T12:57:32Z")
This is my start command
But it does not show the execution of the build block
---
### Author:  [@metachris](https://collective.flashbots.net/u/metachris)
#### Post date: [September 27, 2022, 6:55pm UTC](https://collective.flashbots.net/t/do-you-want-to-run-a-builder/212/9 "2022-09-27T18:55:59Z")
Are you triggering the block production? You will need to run the custom Prysm fork from [GitHub - flashbots/prysm: Our custom Prysm fork for boost relay and builder CL. Sends payload attributes for block building on every slot to trigger building.](https://github.com/flashbots/prysm)
---
### Author:  [@grust](https://collective.flashbots.net/u/grust)
#### Post date: [September 28, 2022, 2:16am UTC](https://collective.flashbots.net/t/do-you-want-to-run-a-builder/212/10 "2022-09-28T02:16:12Z")
I ran the flashbot prysm program, but it still did not appear in the build block
This is my start command
---
### Author:  [@mateusz](https://collective.flashbots.net/u/mateusz)
#### Post date: [September 28, 2022, 4:45pm UTC](https://collective.flashbots.net/t/do-you-want-to-run-a-builder/212/11 "2022-09-28T16:45:09Z")
@grust - let’s move to [Issues · flashbots/boost-geth-builder · GitHub](https://github.com/flashbots/boost-geth-builder/issues)
Please attach your logs there!
---
### Author:  [@grust](https://collective.flashbots.net/u/grust)
#### Post date: [September 29, 2022, 12:40am UTC](https://collective.flashbots.net/t/do-you-want-to-run-a-builder/212/12 "2022-09-29T00:40:29Z")
ok，Submitted
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### Author:  [@mateusz](https://collective.flashbots.net/u/mateusz)
#### Post date: [September 30, 2022, 11:52am UTC](https://collective.flashbots.net/t/do-you-want-to-run-a-builder/212/13 "2022-09-30T11:52:45Z")
For reference - [geth builder doesn't seem to work · Issue #29 · flashbots/boost-geth-builder · GitHub](https://github.com/flashbots/boost-geth-builder/issues/29)
---
### Author:  [@apache-monkey](https://collective.flashbots.net/u/apache-monkey)
#### Post date: [December 21, 2022, 5:09pm UTC](https://collective.flashbots.net/t/do-you-want-to-run-a-builder/212/14 "2022-12-21T17:09:02Z")
I am toying around with a builder at the moment. I like to have my blocks / bundles saved into a DB for analyzing the behaviour a bit better than just with the logs…
I can see in the docs that this is supposed to be possible with the builder by using flashbotsextra.IDatabaseService.
however I am not sure what kind of a database am I supposed to deploy and how to configure builder-geth to use it?
any pointers here please?
---
### Author:  [@metachris](https://collective.flashbots.net/u/metachris)
#### Post date: [December 22, 2022, 8:51am UTC](https://collective.flashbots.net/t/do-you-want-to-run-a-builder/212/15 "2022-12-22T08:51:24Z")
You need a Postgres database, and configure the DSN via the `FLASHBOTS_POSTGRES_DSN` environment variable:
- [builder/service.go at 586fbec873e3ec9952f8aa185fa5942b4346efde · flashbots/builder · GitHub](https://github.com/flashbots/builder/blob/586fbec873e3ec9952f8aa185fa5942b4346efde/builder/service.go#L185)
- [builder/database.go at main · flashbots/builder · GitHub](https://github.com/flashbots/builder/blob/main/flashbotsextra/database.go#L44)
You can spin up such a database with Docker like this:
```auto
docker run -d -p 5432:5432 -e POSTGRES_USER=postgres -e POSTGRES_PASSWORD=postgres -e POSTGRES_DB=postgres postgres
```
then you’d set the environment variable like this:
```auto
export FLASHBOTS_POSTGRES_DSN="postgres://postgres:postgres@localhost:5432/postgres?sslmode=disable"
```
---
### Author:  [@apache-monkey](https://collective.flashbots.net/u/apache-monkey)
#### Post date: [December 22, 2022, 7:29pm UTC](https://collective.flashbots.net/t/do-you-want-to-run-a-builder/212/16 "2022-12-22T19:29:06Z")
> [@metachris](#):
>
> ```auto
> export FLASHBOTS_POSTGRES_DSN="postgres://postgres:postgres@localhost:5432/postgres?sslmode=disable"
>
> ```
Thanks a bunch! this is really helpful. I would assume that I`ll have to create the db schema manually? cheers
---
### Author:  [@metachris](https://collective.flashbots.net/u/metachris)
#### Post date: [December 22, 2022, 8:14pm UTC](https://collective.flashbots.net/t/do-you-want-to-run-a-builder/212/17 "2022-12-22T20:14:38Z")
Oh yeah, seems that the schema is not yet in there.
For now, you’d have to reconstruct the two tables (`built_blocks` and `bundles`) based on the [types](https://github.com/flashbots/builder/blob/main/flashbotsextra/database_types.go) and [tests](https://github.com/flashbots/builder/blob/main/flashbotsextra/database_test.go). If you manage to get it done, a PR would be nice! 🙏 ⭐
---
### Author:  [@apache-monkey](https://collective.flashbots.net/u/apache-monkey)
#### Post date: [December 22, 2022, 10:05pm UTC](https://collective.flashbots.net/t/do-you-want-to-run-a-builder/212/18 "2022-12-22T22:05:52Z")
Definitely! Will have to clean up my script first as I am not super experienced with postgres. (understatement) 😬
Btw how exactly will these two tables be populated? Do I need to enable local relay for saving the built blocks? Which process is responsible for saving the incoming bundles into postgres? cheers
---
### Author:  [@laospace](https://collective.flashbots.net/u/laospace)
#### Post date: [May 5, 2023, 1:40pm UTC](https://collective.flashbots.net/t/do-you-want-to-run-a-builder/212/19 "2023-05-05T13:40:59Z")
Tried to run the builder with Postgres and failed.
here is my table creation SQL: [-- based on https://collective.flashbots.net/t/do-you-want-to-run-a-builder/212/ - Pastebin.com](https://pastebin.com/kGBiLVTq)
after start the PG instance and create the tables, running the builder will result in error log:
> pq: operator does not exist: character varying \* numeric
seems the error is caused by this SQL in [flashbotsextra/database.go](https://github.com/flashbots/builder/blob/main/flashbotsextra/database.go#L66):
> fetchPrioBundlesStmt, err := db.PrepareNamed(“select bundle\_hash, param\_signed\_txs, param\_block\_number, param\_timestamp, received\_timestamp, param\_reverting\_tx\_hashes, coinbase\_diff, total\_gas\_used, state\_block\_number, gas\_fees, eth\_sent\_to\_coinbase from bundles where is\_high\_prio = :is\_high\_prio and coinbase\_diff\*1e18/total\_gas\_used \> 1000000000 and param\_block\_number = :param\_block\_number order by coinbase\_diff/total\_gas\_used DESC limit :limit”)
The expression `coinbase_diff*1e18/total_gas_used` is trying to multiply the `coinbase_diff` column, which is of type `VARCHAR` , with a numeric constant (1e18) and then divide by the `total_gas_used` column, which is of type `BIGINT` , hence the error.
_coinbase\_diff_ has to be varchar according to the go struct defined in flashbotsextra/database\_types.go
It seems that the only way to correct this issue is by updating the SQL code for `fetchPrioBundlesStmt`. This makes me wonder if anyone has ever successfully run the code using a PostgresDB, or if I’m doing something wrong here that I’m not aware of?
---
### Author:  [@Kosala](https://collective.flashbots.net/u/Kosala)
#### Post date: [April 12, 2024, 1:20pm UTC](https://collective.flashbots.net/t/do-you-want-to-run-a-builder/212/20 "2024-04-12T13:20:49Z")
Does Flashbots relay charges a fee from external builders when accepting blocks in the mainnet?