TL;DR
- Clay MCP is the best fit when operations should build the enrichment workflow once and let reps invoke it from an assistant.
- Apollo MCP is the strongest choice for a team already using Apollo data and sales engagement. It supports more than search: contacts, lists, sequences and email actions are documented too.
- ContactOut MCP suits targeted people enrichment and contact checking, especially when the input is a LinkedIn profile URL or a known company domain.
- MCP makes the tools accessible to an assistant. It does not make enrichment free or turn every data lookup into a CRM update.
Choose the provider whose data and workflow you want to buy, then use MCP as the interface. For a new multi-provider process, start with Clay. For an existing Apollo team, connecting Apollo is usually the more direct first move.
Quick comparison
| Provider | Useful documented operations | Authentication and access | Best fit | Main non-fit |
|---|---|---|---|---|
| Clay | Find and enrich people/companies; invoke enabled Functions | OAuth into a selected workspace; admins enable functions and rep access | A shared enrichment recipe, provider waterfall and consistent output | Buying it solely to expose one existing provider lookup |
| Apollo | Search, enrichment, saved contact updates, lists, sequences and email actions | Remote OAuth for interactive users; master API key option for headless clients | Existing Apollo data and engagement workflow | Assuming people search includes revealed emails or that every user should have sending tools |
| ContactOut | People/company search, LinkedIn-based enrichment, decision makers and contact checks | API token through its documented OAuth setup | Targeted contact lookup and checking | Assuming its MCP tool list provides a general CRM write interface |
All three have documented provider MCP routes. This comparison does not treat a community wrapper around a REST API as an official vendor server. Capabilities and commercial bases below were reviewed on 30 September 2026; recommendations are editorial, rather than comparative trial results.
Clay MCP
Clay's advantage is the reusable workflow. An operations team can publish a Function that returns the same fields and follows the same provider order each time. Reps invoke that function through their assistant instead of reconstructing a waterfall in chat.
Modern Launch, Growth and Enterprise plans support enabling Functions for MCP and managing credit controls. The Sales Rep role gives MCP-only access without access to the full Clay interface, tables, keys or workflows. Admins can set a default monthly credit limit and individual overrides; reaching the limit blocks further MCP actions. Clay Audiences' additional CRM ownership controls are Enterprise features. Clay MCP settings.
The remote connection runs on behalf of a signed-in user in the selected workspace. Compatible platforms can register an OAuth client through Clay's published process. There is no MCP surcharge: the same work uses workspace credits at the same rate as it does in Clay. Remote connection documentation.
Buying basis: the current Launch pricing selector offers 15,000 monthly Actions at $60 and 2,500 monthly Data Credits at $125, a $185 monthly starting configuration. Its annual starting display is about $167 per month on an annual commitment. Use the monthly configuration for a month-to-month budget. Actions and Data Credits are separate pools. Clay pricing.
Choose Clay when the function should combine company matching, multiple enrichment providers and a consistent result contract. It is less compelling if the entire job is one lookup from a provider you already pay for. Functions also need an output column; enabling a function without an enrichment or output does not create a useful result.
Apollo MCP
Apollo's current MCP documentation includes search, people and company enrichment, saved contact creation and updates, lists, tasks, sequence operations and one-off emails. That makes it a data-and-execution interface for an Apollo team, rather than simply a contact search box.
The practical distinction is between finding a profile and retrieving its contact details. People search returns profile and availability information; enrichment retrieves available email and phone data. The former is listed as not consuming credits, while enrichment and company search or hiring-data retrieval are credit-consuming actions. Creating an Apollo contact and adding it to a list are listed as not consuming credits. Apollo MCP actions.
Interactive clients connect to the remote server through OAuth. That connection follows the authorizing user's permissions. Headless clients can use a master API key, which is a workspace-level credential rather than a limited rep identity. That is a material difference for an unattended integration. Tool availability still follows the workspace's plan and rollout. Apollo MCP connection and permissions.
Buying basis: Apollo charges no additional fee to connect MCP. Its underlying plan and credit pool pay for data and applicable features. Current public pricing describes Free, Basic, Professional and Custom plans, with credits pooled across the team. It does not provide a stable public dollar total for the specific MCP workflow used here, so the budget basis is the team's Apollo subscription plus credit-consuming enrichment, not an assumed historical per-seat price. Apollo pricing.
Choose Apollo when reps already prospect and manage outreach there. Keep search and contact enrichment available for research; expose sending or sequence enrollment only where those actions belong in the job. Creating a contact in Apollo is not evidence that the contact has reached HubSpot or Salesforce: the CRM integration or a separate CRM tool must perform that step.
ContactOut MCP
ContactOut documents people search, profile enrichment, contact information from a LinkedIn URL, decision makers, company information from a domain, email verification and checks for work email, personal email or phone availability. These are distinct operations: asking whether a phone exists is not the same as retrieving a usable phone number.
Its documented server is https://contactout.com/mcp. Setup requires a ContactOut API token through its OAuth login process. The API separates email, phone and search credit accounting, and endpoint access depends on the account. ContactOut API and MCP reference.
Buying basis: ContactOut's public pricing directs Team/API buyers to custom commercial terms. Use that API package and its search, email and phone units as the cost basis. A search-portal or extension headline is not sufficient evidence of an equivalent MCP/API allowance. ContactOut pricing.
Choose ContactOut when a profile URL, company or known email is the starting point and its lookup tools fit the desired fields. It is a narrower choice than Clay for orchestration. Its published MCP list does not establish arbitrary CRM writes or campaign management, even though the wider API reference contains other product endpoints. Use a separate integration for those steps.
Which actions cost money
| Work | Clay basis | Apollo basis | ContactOut basis |
|---|---|---|---|
| Find candidate people | Sourcing does not use Actions; Data Credits depend on the source | People search is listed as no credit charge | Search-credit pool and endpoint terms |
| Enrich a selected person | One Action per enrichment plus applicable Data Credits | Enrichment consumes plan credits | Applicable email/phone/enrichment terms |
| Run AI research | One Action per AI run plus marketplace AI credits or external model billing | Applicable research/enrichment tool and plan | Assistant/model service outside the contact lookup |
| Export/update the CRM | One Action per exported record; selected integration still required | Apollo contact update itself is listed as no credits; CRM delivery is a separate step | Separate CRM integration/tool |
Clay's current usage documentation distinguishes orchestration Actions from marketplace Data Credits. Using your own provider key removes the marketplace credit charge for that provider's work, but the enrichment still uses a Clay Action and the external provider still bills you. Clay Actions and Data Credits.
Avoid revealing a phone number when the task only needs a work email. Avoid repeating enrichment for a contact already in the CRM with a usable current address. Those choices affect the bill more directly than the number of messages exchanged with the assistant.
An assistant-to-CRM example
Suppose a rep asks: “Find up to five RevOps leaders at northstar.example, show their current roles and available work emails, and prepare approved matches for our account in HubSpot. Do not enroll them in outreach.” This is a fictional workflow design.
First, the assistant uses the connected CRM tool to find the existing company by domain and retrieve its record ID. It then asks the selected data provider for candidate people at that company. It echoes the interpreted company and role filters so an unrelated Northstar does not silently enter the result.
Next, it enriches only the selected candidates. The returned record carries the provider, person identifier or profile URL, work email, role and lookup time. Missing work email remains missing. A personal address is not substituted simply to make all five rows look complete.
Finally, the CRM tool looks for existing contacts by the approved email or record ID and prepares a field-level update. New contacts are associated with the existing company. If a write times out, the workflow reads the CRM before trying to create again. It records the final CRM IDs and leaves outreach enrollment untouched.
With Clay, operations can package the enrichment recipe into an enabled Function and return a consistent payload to the CRM step. With Apollo, search and enrichment can be followed by saving contacts to a named Apollo list, then sending the approved records through the selected CRM path. With ContactOut, the lookup result feeds the separate CRM tool. None requires pretending that a data-server response proves the CRM write succeeded.
The signal-based outbound playbook provides the next step: deciding which observed account facts justify outreach and how to use them in a message.
A practical monthly budget
Assume 1,000 selected contacts each month, one profile enrichment each, and work emails found for 900. For a Clay recipe, assume two enrichment steps per contact, one AI summary per contact and 900 CRM exports: 2,000 + 1,000 + 900 = 3,900 Actions. This is within Launch's 15,000 monthly Actions.
Use the documented example rates of 0.5 Data Credits per profile and 0.5 per found email: 1,000 × 0.5 + 900 × 0.5 = 950 Data Credits. Those selected operations fit within the 2,500-credit monthly starting configuration. These are that recipe's rates, not universal prices for every waterfall or phone lookup. Assume the summaries use an external model key and cost $20 monthly; their Actions still count.
The illustrated Clay platform and model budget is therefore $185 + $20 = $205 per month, excluding CRM and assistant subscriptions already held by the team. The subscription buys the available pools; do not add $125 of included Data Credits again to that total.
For Apollo, the same contacts mean people searches plus 1,000 enrichment attempts; an additional company or job-posting research step adds another credit-consuming operation. Keep the plan's actual action rates and allocation as the commercial basis. For ContactOut, budget search operations separately from email or phone retrieval. Counting “1,000 contacts” as one uniform API unit would hide the different work in both cases.
Now add an illustrative operating cost. Review 100 exceptions for two minutes each: 3.33 hours at $50/hour is $166.67. Two monthly maintenance hours add $100. The Clay scenario becomes $471.67 per month, or roughly $0.59 per usable contact if 800 meet the final matching and email standard. Setup is separate: eight hours at $75/hour is $600 once.
If a reusable function saves three minutes of rep work across 1,000 contacts, it saves 50 hours, worth $2,500 at the assumed rate. Against the $471.67 operating scenario, that leaves about $2,028 in monthly value before setup. This is a break-even illustration, not a measured productivity claim. Existing Apollo or ContactOut customers may achieve the same workflow with a smaller incremental platform purchase.
MCP or REST for the job
Use MCP for a seller's interactive request, a small shortlist or a governed function invoked from an assistant. Use a specified API or platform workflow for recurring bulk enrichment where exact batching, retries and outputs matter. The same provider can support both paths.
For an existing Apollo team, start by exposing its search and enrichment workflow. For operations building one approved recipe across providers, choose Clay. For targeted profile and contact checks, choose ContactOut and keep the CRM step explicit. The useful outcome is a matched, usable contact in the right workflow, not the largest tool menu.
FAQ
Does MCP include free contact data?
It does not replace provider pricing. Clay and Apollo document no MCP connection surcharge, but underlying enrichment still uses their commercial units. ContactOut's API package determines its applicable access and credits.
Can these tools update a CRM?
Clay can support configured export workflows; Apollo has saved-record operations and CRM integrations. ContactOut's listed MCP operations focus on data lookup and checking. Define the actual CRM delivery step and retain its returned record ID.
Is Apollo people search enough to get an email?
No. Its current documentation separates profile search from enrichment that retrieves available contact details. Search first, then enrich the candidates you intend to use.
Which should an agency choose?
Clay is attractive for reusable client-specific workflows. Keep each client's provider and CRM connection distinct. Apollo's standard public plans are for internal business use; using its data in external products or sharing it with customers requires separate commercial terms, so that use case has a different pricing basis.
