B2B SaaS lead generation is sold by the lead and bought by the opportunity, and the gap between the two is where a SaaS company's marketing budget disappears. A lead is a form fill; an opportunity is a qualified account with a problem the product solves, a budget and a person who can sign, and an agency that reports the first number and is paid on it will produce it. This page sets out the channels that produce opportunities for a SaaS company at each stage, the outbound rules an agency has to work under, the definitions the company has to write before anyone is hired, and the numbers an agency should be measured on. The B2B demand generation services guide on this site covers the agencies that do this work, listed on what they publish.
Write the definitions first: MQL, SQL and the account list
Before any agency is briefed, the company writes what a qualified lead is: the segment, the company size, the role, the trigger, and the handoff rule to sales, and it writes the target account list where one exists. Without those, every agency's leads are qualified by the agency's own definition, which is whatever it can produce. The definitions become the agency's contract terms: paid on sales-qualified opportunities accepted by sales, not on form fills, with the acceptance rule written down. A SaaS company that cannot write its ideal customer profile in a paragraph is not ready to buy lead generation, and the honest agency says so.
The channels, by what they produce
Search captures the buyer already looking: the category terms, the comparison terms, the integration and alternative terms, on pages built to Google's search essentials, linked below, and on paid search where the terms are affordable. Content captures the buyer forming the problem, and it is measured by the accounts it reaches, not the downloads it collects. Outbound, email and calling, reaches the account list directly, and it is where most of the rules live. Partner and review-site listings capture buyers comparing. An agency should say which of these it runs, what each produced for a comparable client in opportunities, and what it costs per accepted opportunity, because the channels are not interchangeable and the cheapest lead is usually the worst.
Outbound: the rules the agency works under, in your name
Outbound email to US businesses is governed by the CAN-SPAM Act, whose compliance guide linked below sets the rules on identification, subject lines, opt-out and physical address, and the sender is liable for an agency's messages sent in its name. Calling has its own rules and state variations. An agency proposing outbound should show its opt-out handling, its list sources, its sending infrastructure and its deliverability record, because a burned domain is a cost the company keeps after the agency leaves. The company should send outbound from a separate domain, own the list, and own the sequences, in writing.
The numbers an agency is measured on, and what to ask before hiring
Opportunities accepted by sales, by channel, per month; pipeline value created and the share that closed within the sales cycle; cost per accepted opportunity; and, for outbound, the reply and meeting rates by sequence. Not MQLs, not form fills, not traffic. Before hiring, ask for those numbers from a comparable SaaS client with permission, ask how the agency defines a qualified opportunity and whether it will be paid on the company's definition, and ask who owns the data, the domain and the sequences at the end. The B2B demand generation services guide on this site is the comparison of agencies that do this work, on what they publish.
Questions people ask about B2B SaaS lead generation
What counts as a lead in B2B SaaS lead generation?
What the company defines before hiring: a qualified account matching the ideal customer profile, with a trigger and a person who can buy, accepted by sales. An agency paid on form fills produces form fills; one paid on accepted opportunities produces those.
Which channel works best for SaaS lead generation?
None best in general: search captures buyers already looking, content reaches accounts forming the problem, outbound reaches a named list, listings catch comparers. An agency should show what each produced for a comparable client in accepted opportunities and the cost per one.
What rules apply to outbound email from an agency?
The CAN-SPAM Act in the US, on identification, subject lines, opt-out and address, and the company is liable for messages sent in its name. Send from a separate domain, own the list and sequences, and check the agency's opt-out handling and deliverability record first.