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Saniya Sood
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Published October 8, 2026 · Updated October 8, 2026
The short answer: a B2B lead generation agency sells you meetings instead of software. The ten below all run outbound for other companies from US operations, and they differ on three things that matter more than the logo: the channel they lead with (LinkedIn, cold email, phone, or all three), whether they publish a price (only one of the ten prints a monthly figure), and what they are willing to state in numbers. Expect to pay from a few thousand dollars a month for a managed SDR seat, and expect every agency to ask for a call before quoting.
Disclosure: Cleverly, Snipe Outbound and Modern Inbound have exchanged links with Valley. That did not decide inclusion or order; the list is alphabetical after the first entry, which was the requester of this article. Valley sells outbound software, which competes with part of this budget, and is marked where it appears. Every fact below was read from the agency's own website on October 8, 2026.
Valley is an AI outbound platform that finds the people most likely to buy from you - from live buying signals, natural-language search, or your own lists - qualifies them against your ICP, researches each one, and sends personalized messages across email and LinkedIn that get 15-45% reply rates, against a category average of about 2%.
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How we checked
We read each agency's homepage and service pages on October 8, 2026 and recorded only what is printed there: services, location, any published price, and the metrics the agency itself states. We have not bought from these agencies and do not vouch for their numbers; where a figure is theirs, the sentence says so. Agencies that block automated reading of their site, or that publish no verifiable detail, were left out.
Agency | Base | Channels | Published pricing | What it states |
|---|---|---|---|---|
Cleverly | California | LinkedIn, cold email, cold calling, outsourced SDRs | No | 1,000 active clients, $312M pipeline generated |
Belkins | Dover, Delaware | Email, calling, SMS, LinkedIn, paid ads | No | $2B+ client revenue since 2017 |
Callbox | Teams in the US and six other countries | Lead gen, appointment setting, ABM, events | No, custom | 15K+ companies served since 2004 |
CIENCE | United States | SDR teams, email, calling, inbound | SDR teams from $5,600/mo | 2,500+ B2B teams |
Leadium | Las Vegas, Nevada | Email, phone, LinkedIn, SMS, gifting | No | $6.7B funding raised by clients |
Modern Inbound | Not stated (US and India markets) | Cold email, message-market testing | No | 6,000+ warm leads delivered |
Operatix | London, with California, Texas and Singapore offices | Outsourced SDRs for software vendors | No | 800+ software vendors, 300+ SDRs |
SalesHive | United States | Cold calling and email on its own platform | Flat monthly fee, figure not printed | 129,000+ meetings booked |
SalesRoads | Boca Raton, Florida | Appointment setting, SDR outsourcing | No | Founded 2007, Inc. 5000 |
Snipe Outbound | Not stated | Managed cold email, appointment setting | No | 100 demos in 64 days for one client |
1. Cleverly: LinkedIn-led outbound with a large review base
Cleverly runs LinkedIn lead generation, cold email, cold calling, appointment setting and outsourced SDRs from California, and describes its method as “a proven outbound system refined over 8+ years”. The site states 1,000 active clients, 224.7K leads generated, $51.2M in client revenue and $312M in pipeline, and says it is the only B2B lead generation agency with 1,000+ five-star reviews. No pricing is published; every page ends in a free consultation.
Choose it when LinkedIn is your primary channel and you want one agency to run the whole outbound motion rather than email alone.
2. Belkins: omnichannel appointment setting, Delaware
Belkins was founded in 2017 and runs cold email, cold and intent calling, voicemails, SMS and WhatsApp, LinkedIn and paid advertising, plus outsourced SDRs, lead research and CRM consulting. It states $2B+ in client revenue since 2017, typical results of 100 to 400+ qualified appointments a year, a 4.9 rating on Clutch from 230 reviews and 4.8 on G2 from 93. No pricing is published.
Choose it when you want every channel under one roof and value a long public review record.
3. Callbox: 20 years, teams on four continents
Callbox has run B2B lead generation and appointment setting since 2004, with teams in the US, UK, Australia, Singapore, Malaysia, Hong Kong and Colombia serving 60+ countries. It states 15K+ companies served and 10K+ campaigns, and offers ABM, event and webinar marketing, outsourced SDR teams and cross-border lead generation. Pricing is custom and varies by campaign scope, target market and engagement model.
Choose it when your targets sit in several regions and you need one vendor that already staffs them.
4. CIENCE: the one that prints a price
CIENCE sells managed outbound and inbound SDR teams, cold email and calling, appointment setting and campaign research, and is the only agency here with a figure on the page: SDR teams from $5,600 a month, a 60-day revenue system setup from $9,500, and free platform access to start. It states 2,500+ B2B teams served across 250+ industries, 115+ documented case studies and an average 4.4 out of 5 across eight review platforms.
Choose it when you need a budget number before the first call.
5. Leadium: multichannel sequences including SMS and gifting
Leadium in Las Vegas runs outbound appointment setting across email, phone, LinkedIn, SMS and gifting, qualifies inbound leads, and sells human-validated contact data. Its contact form asks for a monthly budget from $2,500 to $3,500 up to above $10,000, but prices are not printed. It states $6.7B in funding raised by its clients, five client IPOs and 500+ sales leaders who trust the service.
Choose it when you want sequences that go beyond email and LinkedIn into phone, text and physical touches.
6. Modern Inbound: cold email as a test, not a retainer
Modern Inbound sells a Message-Market Fit Test: it sends from 30 mailboxes across several domains, tests 100+ angles on your offer and reports whether the market responds, with a cap of up to 20 warm leads in India, 10 outside India and 5 in the US, over at most 90 days. It serves B2B companies with an offer that has already sold and a market of at least 50,000 accounts, and states 6,000+ warm leads delivered. The test is non-refundable and the price is not printed.
Choose it when you want to know whether cold email works for your offer before committing to a retainer.
7. Operatix: SDRs for software vendors, 22 languages
Operatix is London-based with offices in California, Texas and Singapore and works only with B2B software vendors. It states 800+ software vendors served, 300+ SDRs, coverage in 22 languages and a 4.8 out of 5 rating from 93 reviews. Services are outbound sales development, inbound qualification, and marketing and channel acceleration. No pricing is published.
Choose it when you sell software into EMEA or APAC as well as the US and want SDRs who already speak the language.
8. SalesHive: US-based SDRs on a flat monthly fee
SalesHive runs cold calling and email outreach on its own platform with US-based SDR teams (offshore calling is an option), and bills one flat monthly fee covering the SDR team, strategist, platform, data and tools, with no setup fees and no long-term contracts; the fee itself is not printed. It states 129,000+ qualified meetings booked, $2.5B+ in pipeline, 2,285 clients and 47+ industries since 2016, and names Shopify, Siemens, Otter.ai and Zoho among clients.
Choose it when phone is a real channel for your buyers and you want US callers without a long contract.
9. SalesRoads: appointment setting since 2007
SalesRoads in Boca Raton, Florida sells appointment setting, lead generation and SDR outsourcing through outbound calling, email and list building, with dedicated SDRs, a client strategist and performance coaches per account. Its quote form asks whether your monthly investment is under $5,000, $5,000 to $10,000 or more. Published client results include 937 appointments for AchieveIt and 210+ meetings at a 26% close rate for Factor.
Choose it when you want a calling-led team with a long operating history.
10. Snipe Outbound: managed cold email for SaaS teams that sell by demo
Snipe Outbound runs a done-for-you cold email system covering approved targeting, prospect research, copy, dedicated sending infrastructure, reply handling, qualification and calendar booking, for established B2B SaaS companies that sell through demos. Its two published case studies state 100 demos booked in 64 days for Terrific Live and roughly $1.15M in qualified pipeline over 30 days for Seventh Gear AI, with a note that results vary and neither is a guarantee. Engagement starts with a diagnostic call; no pricing is printed.
Choose it when email is your channel and you want someone else to own the infrastructure and the inbox.
► Want to see the software route on your own accounts? Book a demo
Agency or software? An agency rents you people and a process; software rents you the process and leaves the people to you. Agencies win when you have no one to run outbound, when phone is the channel, or when you want results without learning the tooling. Software wins when you have one person who can own it, when your buyers are on LinkedIn and email, and when you want the list, the research and the messages to stay in your own accounts after the engagement ends.
Where Valley fits (our product, marked as promised). Valley is the software route for the LinkedIn and email half: it finds people showing buying signals, qualifies them against your ICP, researches each one and writes the message, with a person approving every send. From $149 per seat a month billed quarterly ($199 monthly), 7-day trial. The longer comparison is lead gen agency vs outbound software.
How to run a fair trial with any agency
Give every agency the same audience: one segment, one offer, one calendar link, for 60 days.
Ask what one meeting costs on their quote, all in: platform, data, mailboxes, domains and the SDR's time.
Ask who owns the list, the copy and the sending domains when the contract ends.
Count meetings that showed up and fit the ICP, not meetings booked.
Read the case studies for the caveat line; the honest ones say results vary.
► Run the software side of the trial yourself: 7 days free
FAQ
How much does a B2B lead generation agency cost? Most of the agencies here publish no price. CIENCE prints SDR teams from $5,600 a month; Leadium's and SalesRoads' intake forms start their budget bands at $2,500 and under $5,000 a month respectively.
Which lead generation agency is best for LinkedIn? Cleverly leads with LinkedIn and states 1,000 active clients; Belkins and Leadium include LinkedIn in multichannel sequences. If you want the LinkedIn work done in-house with software, that is the job Valley does.
What should an agency contract include? Ownership of the list and copy, who pays for domains and mailboxes, the definition of a qualified meeting, and the notice period.
Are these the only good agencies? No. This list is the ten with US operations whose sites we could read and verify on October 8, 2026. Agencies that block automated reading, such as Martal Group, are not here for that reason alone.
How this page was made: the facts were read from the sources named in the text on October 8, 2026; drafted with AI assistance; fact-checked, reviewed and edited by Saniya Sood.
