Sequencer Event Poller

Read the replies, bounces, unsubscribes, meetings booked, interest changes, and LinkedIn replies from your Instantly, Smartlead, HeyReach, and lemlist accounts in one place. Add your own API key for one or more of them, pick a time window, and get one flat row per event: who, which campaign, what happened, when, and the reply text where the vendor returns it. Schedule it daily with Only new events on and each run returns only what changed since the last one. Rows export to CSV or drop into a Clay table, a CRM import, or a reply routing step.

The actor only reads your account. It never creates, edits, pauses, or sends anything in a sequencer, and it never creates a campaign.

Features

• Four sequencers, one row layout. Instantly, Smartlead, HeyReach, and lemlist events land in the same columns, so one table holds every reply across tools.
• Your own API key. Each vendor is read on the key you supply, from your own account. Keys are used for the run only, never stored, and never written to a row or a log.
• Only new events. On a schedule, an event an earlier run returned is skipped and not charged.
• A run summary row, always. One free row per run with counts per vendor and event type and the status of each vendor (ok, partial, error, or skipped), so a refused key or a page limit is visible, not silent.
• Read only by construction. One function sends every request, and it refuses any call that is not a read. The only POST calls are the two search endpoints Instantly and HeyReach expose as POST to list records. The request_log in the run's RUN_SUMMARY record lists the method, endpoint, and status of every call, so you can check it yourself.
• Cost guards. Max pages per query, max events per run, and a max charge per run.

Which vendor reports which event

Event type	Instantly	Smartlead	HeyReach	lemlist
reply (email)	yes, received emails in the primary inbox	yes, campaign statistics		yes
linkedin_reply			yes, inbox conversations whose last message is from the lead	yes
bounce	yes, bounced leads	yes		yes
unsubscribe	yes, unsubscribed leads	yes		yes
meeting_booked	yes, lead interest status			yes
interested	yes			yes
not_interested	yes			yes
out_of_office	yes			yes
connection_accepted				yes
open		yes		yes
click		yes		yes

Instantly reports bounces and unsubscribes as a lead status, not as a dated event, so a bounce's time is the lead's last send and an unsubscribe's time is when the lead record last changed. HeyReach is read for LinkedIn replies only. A blank cell means the vendor's public API gives no read for that event, and the actor does not guess one.

Input

Field	Type	Default	What it does
instantly_api_key	string, secret		Your Instantly API v2 key with a read scope. Instantly API access needs a paid Instantly plan
smartlead_api_key	string, secret		Your Smartlead API key
heyreach_api_key	string, secret		Your HeyReach API key
lemlist_api_key	string, secret		Your lemlist API key
since_hours	integer	24	Look back this many hours, at most 2160 (90 days)
since, until	string		Optional exact window in UTC, for example 2026-10-20T00:00:00Z
event_types	array	reply, linkedin_reply, bounce, unsubscribe, meeting_booked, interested, connection_accepted	Which events to return
only_new	boolean	true	Skip events an earlier run returned (free)
state_key	string		Name for the only new events memory
instantly_campaign_ids, smartlead_campaign_ids, heyreach_campaign_ids, lemlist_campaign_ids	array		Read only these campaigns. Empty: every campaign the key can see (Smartlead drafts are skipped)
max_pages_per_query	integer	20	Pages of 100 records per vendor query
max_events	integer	5000	Event rows per run, oldest first
max_charge_usd	string		Stop before a charge that would pass this amount

With no key at all, the run returns one free run summary row with row_status skipped and a note saying no key was given.

Output

One row per event, plus one run summary row per run. Every row has the same columns.

Field	Type	Example
row_type	string	event or run_summary
event_id	string	lemlist:reply:act_1
vendor	string	lemlist
event_type	string	reply
vendor_event_type	string	emailsReplied
channel	string	email
occurred_at	string	2026-10-20T18:00:00.000Z
lead_email, lead_first_name, lead_last_name, lead_company, lead_linkedin_url	string	lucia@example.com
campaign_id, campaign_name	string	cam_1, EU founders
sender_account	string	the sending mailbox or LinkedIn account, when returned
subject	string	email subject, when returned
message_excerpt	string	first 500 characters of the reply, when returned
sequence_step	integer	2
vendor_record_id	string	the vendor's own record id
is_new	boolean	true with Only new events on
window_start, window_end	string	the window read
vendors_checked, vendors_skipped, event_count, new_event_count, counts_json, vendor_status_json	run summary only	counts and per vendor status
row_status	string	ok, no_change, skipped, partial, or error
error_reason	string	why a summary is not ok
billable_events_json	string	{"event-row":1}, or {} for a free row
checked_at	string	when the row was written

Pricing

Pay per event. You pay for event rows and the run start. The run summary row is free, already delivered events are free, and a run with no key charges only the start.

Event	Free plan	Bronze	Silver	Gold
event-row, one sequencer event	$0.008	$0.0076	$0.0072	$0.0068
apify-actor-start, once per run (one per GB of memory; the default 128 MB is one)	$0.001	$0.001	$0.001	$0.001

Per 1,000 event rows: $8.00 on the free plan, $6.80 on Gold.

Free plan cap: 1.50 USD of evaluation a month, about 188 event rows. Any paid Apify plan removes the cap, and it resets on the 1st. The run stops before a charge that passes your maximum charge per run in Apify or your max_charge_usd.

Mamba Labs pays the platform costs of your run. The vendor API calls run on your own API key and your own vendor account, under that vendor's plan and rate limits. This actor adds no charge from any vendor.

Usage examples

Apify Console or API. Add your keys, set Look back to 24 hours, and schedule the actor daily. Read the dataset with GET https://api.apify.com/v2/datasets/{datasetId}/items.

{
  "lemlist_api_key": "YOUR_LEMLIST_API_KEY",
  "smartlead_api_key": "YOUR_SMARTLEAD_API_KEY",
  "since_hours": 24,
  "event_types": ["reply", "linkedin_reply", "bounce", "meeting_booked"],
  "only_new": true
}

Clay. Run the actor from a Clay HTTP column or the Apify integration and map the flat columns. Every input accepts strings.

MCP. The Mamba Labs MCP server @mambalabsdev/mcp-sequencer-event-poller exposes the tool poll_sequencer_events to Claude and other MCP clients. Vendor keys come from the server environment.

Error handling

Case	What you get
No key given	One free summary row, row_status skipped
A key is refused (HTTP 401 or 403)	That vendor reads error in vendor_status_json; the other vendors still run
The vendor rate limits the run (HTTP 429)	The request waits and retries up to 3 times
A query reaches Max pages per query	The summary row reads partial and names the query
No new events	One free summary row, row_status no_change
The only new events store cannot be opened	Every event in the window is returned, and the summary note says so

Limitations

• The actor reads each vendor's public API as documented on 2026-10-21. A vendor that changes a field name can leave a column empty until the actor is updated.
• Instantly allows about 20 API requests a minute, so the actor waits about 3 seconds between Instantly requests. A large Instantly backfill takes minutes.
• Smartlead reply text, meeting, and interest events are not in its statistics endpoint, so Smartlead rows carry no message text and no meeting or interest events.
• HeyReach connection acceptances are not readable through its public API list endpoints, so they are not returned. lemlist reports them.
• Instantly bounce times are the lead's last send, and unsubscribe times are the lead record's last change; neither is a vendor event time.
• Live runs need your own vendor keys. The actor's tests use saved responses built from each vendor's public API documentation.

Mamba Labs actor suite

Actor	Actor ID
Account Hiring Watch	gRAZA5WBi1r6L0gy7
Agent Accessibility Auditor	anxbRv0lKrpQ1pnua
Agent to Brokerage Resolver	ePRRGLxOGyaVHO4dI
AI Tooling Detector	EwkHhmqiuJgRoVEbE
B2B Reddit Conversation Monitor	SoDryzzsjmY3SsiyG
Bluesky Brand Presence Mapper	eLpxzP4IuXznlFVND
Career Change Signal Engine	vX2Yga1a6wGaXaP14
Company Change Event Feed	oX44rS0fkEJ3rXLWe
Company Contact Details Extractor	4mMncKaJykiq94grz
Company Discovery List Builder	jch0HdaZnpbMqlcGS
Company Firmographic Enricher	YlUtLWjfPpqykmB8g
Company Funding Record	OFS4Mt1gyYNtGfUbE
Company Identity Resolver	lr8fTRAmZCBZmuwwh
Company Social Presence Mapper	4k6CCemkgBDz18m2h
Contact Classifier	0lGSeYJmniXhGANnO
Cookie Consent Audit	TrKyOS0KBoGC35nbr
Domain Deliverability Checker	0tVgxI7A6o9jMlxmc
Domain to LinkedIn URL Resolver	3HtnSaqPHOg1Qg5gx
Ecommerce Platform Profiler	5G2NeYjBbQTjaTn9L
Event Presence Index	WLhMy8fMDgsxdYxv5
Expert Witness Directory	LIpwlgfE3LaQBaXd4
Funding and Press Signal Scanner	FS13X6dhQVgX3XOM6
GitHub Organization Signal Scanner	ahF8RRpv5mzPao5CN
Google Ads Transparency Monitor	1eOwxhBVxzvOXAm4s
Government Contract Award Monitor	zhEtllASykOcx9hJ8
GTM Hiring Signal Scraper	D7O1SA2EqwHGsGr1P
GTM Signals Aggregator	xKdRfnfFNkdMpFuNs
ICP Fit Scorer	W161DT8W4kW55dMFh
Influencer Change Monitor	d2VVgahNL6UmcLkhg
Influencer Finder	tpkedmloIIWtXx6sg
Influencer Lead List Builder	KnmByszcv135yM30G
Influencer Profile Scraper	EqEnklDVMIcB1V499
Influencer Talent Agency Lookup	zCuX4Mgyg6JvXgGzd
Instagram Facebook Brand Presence Mapper	HXh65I0JBjPsunbY8
Integration and Marketplace Presence Mapper	V0guNuvM85Q61f2gj
Job Board Keyword Signal Scanner	4DvqpvhMR74NLcDDY
Job Change Tracker	L8UbEmMJC1XYPSZOb
Job Posting Monitor	QCfICD9kOPiOdj5iI
Legal Entity Resolver	KHFyPCDIx7CyqULYm
Link in Bio Scraper and Newsletter Detector	OorucdheTIgu7RFzK
LinkedIn Company Page Mapper	zOPm6A9JEhUGcIdFW
LinkedIn Post Tracker	oiGLNPuaf5BRaz9K5
Meta Ad Library Monitor	J1GWlSXfSGU3u8Wng
Mobile Phone Waterfall	6OOgPktf7RIa5XCOP
New Hire Finder	cKuc38p4nYHNF3IW8
Outbound Stack Detector	v43UJC8r7qW7cBSTG
Page Finder and Extractor	TpurgcOZbVnknlaiC
People Finder & Email Verifier	LEgloG7tWgQl4o6TD
Person Social Footprint Mapper	jfQXa2zW9FHCJot9K
Pinterest Brand Presence Mapper	d1HvjZfKhgvWsoEwn
Prospect Engine	q9rT6v64nUJdPexOQ
Publishing Frequency Tracker	TbLwaUUATdYb6wp4N
Reddit Brand Presence Mapper	pKQZmDaT70SEb54bZ
Reporting Window Finder	uINxR7a1IW8qUTRUX
Sequencer Lead Push	0Jv27VeWM5tSZQs9x
Team Page People Extractor	j8a9zX0k4mNbvDbWK
Tech Stack Signal Detector	qyd7nNyqFPelQViBx
TikTok Brand Presence Mapper	fco8FvoJcSafbeyd1
Trustpilot Reputation Enricher	3lIqfCt61j4hqE1xz
WCAG Accessibility Audit	P3jBj3FRghKEhX52z
Website Traffic Rank Estimator	GnOFUzlNVIoXgeJjH
Work Email Waterfall	OT6xqTFThC0Rjf7Zj
Workplace Program Detector	Li6pPDhqbdzFz3h7G
X Brand Presence Mapper	oLOgadhHUkNAyDA3w
YouTube Channel Stats Extractor	6hSpD3kd2s2IQ4VSs

MCP servers for the suite are published under the npm scope @mambalabsdev.

Built by Mamba Labs.