GTM engineering agencies in the US
24 agencies in the index offer GTM engineering and serve buyers in the US. Ranked by the evidence on record, the first three are Skydog Ops (New York, US, from $10,000 a month), FullFunnel (Boston, US, from $5,000 a month) and SalesCaptain (London, UK, from $3,500 a month). The deliverable is a system the client keeps, so ask for documentation and access to every workflow and table the agency builds. The largest market in the index; buyers span four main time zones, so send and call windows matter as much as copy. 14 of the 24 publish a monthly minimum, from $2,500 to $10,000, with a median of $5,000. 0 offer pay-per-meeting pricing and 1 offers pay-per-lead; the rest work on a retainer or do not say. Besides GTM engineering, the services most often offered here are cold email, intent data and list building. 24 build on Clay, 11 work inside HubSpot and 0 use their own or undisclosed tools. 8 have a Clutch or G2 rating on file with the date it was read. Before signing, ask for a sample sequence, the definition of a qualified meeting and who owns the domains and data afterward.
| # | Agency | HQ | Stack | From (monthly) | Model | Proof | Badges |
|---|---|---|---|---|---|---|---|
| 1 | Skydog Ops↗ Clay-to-CRM signal ingestion and scoring | New York, US | Clay, HubSpot | $10,000 | Retainer | G25.0 (165) | Clay Native |
| 2 | FullFunnel↗ | Boston, US | Clay, HubSpot | $5,000 | Retainer | G24.7 (72) | Clay Native |
| 3 | SalesCaptain↗ ~$3.5k/mo commonly cited; signal-based outbound | London, UK | Clay, HubSpot | $3,500 | Retainer | Clutch4.7 (22) | Clay NativeEditor's PickTop Outbound Agency Europe 2026 |
| 4 | demandDrive↗ Clay Studio Partner; pairs Clay builds with outsourced SDRs | Waltham, US | Clay, HubSpot | $5,000 | Retainer | G24.6 (69) | Clay NativeSDR Pod |
| 5 | Groflo↗ Forward-deployed SDRs on top of Clay engine; quarterly terms | Miami, US | Clay, Instantly, Smartlead | $6,000 | Retainer | n/a | Clay NativeSDR Pod |
| 6 | Growth Alliance↗ Three principals; programs from $10k/mo, smaller work from $2.5k | Prague, CZ | Clay, HubSpot | $2,500 | Retainer | n/a | Clay Native |
| 7 | OneGTM↗ Done-with-you GTM engineering + advisory | US | Clay, Instantly | $5,000 | Retainer | n/a | Clay Native |
| 8 | RevenueHoop↗ RevOps + outbound campaign design | New York, US | Clay, HubSpot | $5,000 | Retainer | n/a | Clay Native |
| 9 | Workflows.io↗ AI RevOps + ABM sprints; 3-month minimum | New York, US | Clay, HubSpot | $5,000 | Retainer | n/a | Clay Native |
| 10 | Blue Modern Advisory↗ Clay-to-Snowflake reporting; regulated-industry focus | New York, US | Clay | $10,000 | Retainer | n/a | Clay Native |
| 11 | DealDeploy↗ PE deal-sourcing niche; deliverables in client-owned GitHub | New York, US | Clay, Custom | $10,000 | Retainer | n/a | Clay Native |
| 12 | Terra Firma↗ Weekly outbound experiments for early-stage startups | New York, US | Clay | $10,000 | Retainer | n/a | Clay Native |
| 13 | The Kiln↗ Clay-native; reported acquired by 2X | Brooklyn, US | Clay | $10,000 | Retainer | n/a | Clay Native |
| 14 | ColdIQ↗ Clay Elite Studio; remote Europe-based delivery; now also sells a GTM data API | Not published | Clay, Smartlead, Instantly, lemlist, Apollo | Ask | Not published | G22.5 (6) | Clay NativeEditor's Pick |
| 15 | Operatus↗ Salesforce/HubSpot consulting plus Clay enrichment | New York, US | Clay, HubSpot | Ask | Not published | G24.7 (29) | Clay Native |
| 16 | Spring Drive↗ London + New York | London, UK | Clay | Ask | Not published | Clutch4.9 (12) | Clay Native |
| 17 | RevPartners↗ HubSpot Elite + Clay Elite Studio partner; RevOps-led | US | HubSpot, Clay | Ask | Not published | Clutch5.0 (1) | Clay Native |
| 18 | Growth Engine X↗ High-volume cold email; free test campaign; 3-month minimum | New York, US | Clay, Smartlead, Instantly | Ask | Retainer | n/a | Clay NativeVerified Deliverability |
| 19 | Vanderbuild↗ Retainer, project or pay-per-warm-lead | Warsaw, PL | Clay | Ask | Hybrid | n/a | Clay Native |
| 20 | LeadHaste↗ Publisher of several self-ranked listicles | Sofia, BG | Clay, Custom | $2,500 | Retainer | n/a | Clay NativeVerified Deliverability |
| 21 | OpsLiftOff↗ Fractional RevOps with Clay enrichment | Boston, US | Clay, HubSpot | Ask | Not published | n/a | Clay Native |
| 22 | Understory↗ Clay Enterprise Partner; allbound model mixing paid media and outbound | Miami, US | Clay, HubSpot, Instantly | Ask | Not published | n/a | Clay Native |
| 23 | Lead Assassin↗ | Manila, PH | Clay | Ask | Not published | n/a | Clay Native |
| 24 | Zevenue↗ Clay TAM builds plus rep training | Toronto, CA | Clay | Ask | Not published | n/a | Clay NativeTop Outbound Agency Canada 2026 |
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What differs in the US
- Compliance:CAN-SPAM allows B2B cold email without prior consent if it identifies the sender, carries a postal address and honors opt-outs; the TCPA restricts autodialed calls and texts to mobile numbers.
- Budget:14 of the 24 publish a monthly minimum, from $2,500 to $10,000, with a median of $5,000.
Related pages
Questions
- How much does a GTM engineering agency cost?
- 14 of the 24 publish a monthly minimum, from $2,500 to $10,000, with a median of $5,000. Setup fees and minimum terms vary, so ask for both before comparing monthly prices.
- Retainer or pay-per-meeting?
- A retainer buys an agreed scope each month and suits a defined ICP with at least three months of runway. Pay-per-meeting moves the risk to the agency and suits offers with a short sales cycle. On this page, 0 agencies offer pay-per-meeting pricing and 1 pay-per-lead.
- How long until results?
- New sending domains need two to three weeks of warm-up before volume goes out, and list building runs alongside it. Most agencies quote first meetings in weeks four to eight.
- Does the stack matter?
- 24 of the 24 build on Clay and 11 work inside HubSpot. Ask who owns the sending domains, the data and the workflows when the engagement ends; some agencies hand them over and some keep them.