Mark a transaction message for monitoring
A simple reaction can turn a transaction follow-up into a prepared monitoring step, without writing another instruction.
Trigger
Message Reaction Added
Triggered when a reaction is added to a message in Slack. Supports optional filtering by channel and emoji name.
Action
Subscribe Transaction Hash
Tool to subscribe to transaction state change events of an ethereum transaction hash. use after establishing a blocknative websocket connection to prepare the subscription message.
Why this helps
Adding another written follow-up creates friction when a quick signal would be easier to use consistently.
- Use a reaction as a low-effort monitoring cue.
- Prepare a subscription for a hash in the reacted-to message.
- Make transaction follow-up easier to remember.
Setup
Build it in a few focused steps.
- 1Connect Slack and Blocknative to Notis once in the portal.
- 2Create an automation in the portal or ask Notis conversationally.
- 3Describe in one plain-language instruction which reaction should mean prepare a subscription for a transaction hash in the message.
- 4Select the Slack reaction added trigger and choose a run-report channel.
- 5Test by adding the selected reaction to a real message containing a transaction hash.
Questions about this workflow
What happens if the message has no transaction hash?
The instruction should have Notis skip the subscription preparation when no hash is present.
Does reacting start a live websocket connection?
No. The action prepares subscription details; a websocket connection is required for live updates.
When this happens · Trigger
Do this · Action
Supported Triggers and Actions
Notis builds workflows that link Slack to Blocknative. A trigger fires from one place; an action lands in another.
Slack triggers
Blocknative actions
Recurring trigger
Notis starts this workflow on a schedule, such as daily, weekly, or during business hours.
Configure Mempool Filters
Tool to configure filters and abi decoding for ethereum mempool transactions. use after establishing a blocknative websocket connection to set up event filters and decoding.
Webhook trigger
Notis starts this workflow when an external tool or custom backend sends an HTTP request.
Get Gas Price Distribution
Tool to retrieve the current mempool gas price distribution breakdown. use when analyzing gas price trends or preparing fee strategies.
New Channel Created Trigger
Triggered when a new channel is created in Slack.
Get Gas Oracles
Tool to retrieve metadata on supported gas oracles per chain. use when you need to dynamically discover all available on-chain gas estimation oracles across networks.
Channel Message Received
Triggered when a message is posted in a Slack channel (public, private, or multi-party IM). Does NOT match direct messages.
Get Gas Prices
Tool to fetch gas price estimates for specific inclusion probabilities. use when you need gas price ranges for the next block or next ~10 seconds.
Direct Message Received
Triggered when a new direct message (DM) is sent to a user in Slack. Catches all DMs across all DM channels.
Get Supported Chains
Tool to retrieve supported chains metadata. use when discovering available networks for blocknative gas services.
Message Reaction Added
Triggered when a reaction is added to a message in Slack. Supports optional filtering by channel and emoji name.
Get Base Fee Estimates
Tool to get real-time predictions for base fee and blob base fee for the next 5 blocks. use when you need both 99% and 50% confidence estimates for upcoming blocks.
Message Reaction Removed
Triggered when a reaction is removed from a message in Slack. Supports optional filtering by channel and emoji name.
Subscribe Multichain
Tool to generate websocket subscription details for events across multiple chains. use when preparing to track a transaction hash or account address across chains via blocknative multichain sdk.
Reaction Added Trigger
DEPRECATED: use `SLACK_MESSAGE_REACTION_ADDED` instead. Triggered when a reaction is added to a message in Slack.
Subscribe Transaction Hash
Tool to subscribe to transaction state change events of an ethereum transaction hash. use after establishing a blocknative websocket connection to prepare the subscription message.
Connect any two apps with Notis in the middle.
Slack and Blocknative, or any other combination from 1,000+ integrations.
When this happens · Trigger
Do this · Action
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