Giving a SaaS product an MCP server costs three things: the design work to turn an API into a few safe tools, the hosting of the endpoint assistants connect to, and the ongoing care as assistants change. At API to Agents those map to a one-time setup fee from $499 and a monthly hosting plan from $29.99. Prices are in USD and exclude applicable taxes; the setup total depends on the agreed scope. This article explains what sits behind each number so you can compare it honestly with doing the work in-house.
The prices are produced by versioned rules, not by a sales conversation, and every line item is listed on the pricing page. The amounts and examples below were checked against pricing rule version 2026-09-13.v2 on October 11, 2026. The point of this article is the reasoning, not the table.
Who MCP is for
MCP, the Model Context Protocol, lets assistants such as ChatGPT and Claude call tools exposed by your service. It is worth the cost when three things are true:
- Your customers already use assistants. If they ask ChatGPT or Claude to get things done, being reachable from that conversation is a distribution channel, not a technical curiosity.
- Your product has outcomes an assistant can deliver. Search, look up, check status, create a request, place an order. Products whose value is mostly in a visual interface gain less.
- You have an API, documented well enough to build on. It does not need to be perfect; the audit tells you where it stands, and incomplete documentation is a priced line item rather than a blocker.
If those hold, the question becomes what you are paying for.
Cost one: design
The expensive part of an MCP integration is deciding what to expose and how. A customer-facing assistant needs a handful of outcome-shaped tools, each with a description it can act on, a clear read-or-write boundary, and a confirmation step where an action has consequences. Done badly, the assistant picks the wrong tool, leaks a record, or places a duplicate order.
In-house: this is engineering and product time, and it is usually underestimated because the decisions are discovered during the build. Delivery time depends on scope and team experience.
At API to Agents: the Agent Readiness Audit proposes the tools automatically from your documentation, and the setup fee covers our team validating and building them. The base scope is one upstream API, up to three read tools, API-key authentication, and one revision round, for $499. Each additional read tool is $60, each write tool $120, and each guarded tool with a confirmation step adds $200 of safeguards.
Cost two: authentication and documentation
Two scope items change the price more than any other, because they change the work:
- OAuth or OpenID Connect instead of API keys adds $300, because the server must separate authorizing the connection from accessing records and map each call to the right user. A custom authentication scheme is $600.
- Missing or partial documentation adds $300, because we document the API with you before building on it. Documentation available only as HTML pages counts as partial.
In-house, these are the same costs in a different currency: engineering days rather than a line item.
Cost three: hosting and care
For the hosted remote integrations discussed here, the MCP server exposes an HTTPS endpoint with credentials, permission checks, logs, and a dependency on clients that keep changing. MCP also supports local connections over stdio; see the MCP transport specification. Running it is a standing responsibility, which is why the hosting plan is monthly and separate from setup.
In-house: small infrastructure cost, plus the attention of whoever owns it. The risk is that nobody does once the project ends.
At API to Agents: Starter is $29.99 per month for a focused first integration, Growth is $99.99 per month for a larger scope, and billing starts only when the integration is live. The plan covers the endpoint at your subdomain, monitoring, maintenance, and updates as clients change. Compare the options in MCP server hosting: self-hosted, platform, or managed?.
Three illustrative quotes
These are worked examples from the published rules, not customer cases. Raw totals are rounded up to the next $50 step minus $1.
- A documented REST API, API keys, three read tools. Setup $499. The simplest case: a search tool, a lookup tool, and a status tool.
- The same API with two write tools and one guarded action. Raw $499 + $240 + $200 = $939, rounded to $949. Typical for "find, add to cart, place order with confirmation".
- An OAuth-protected GraphQL API with four read tools and one write tool. Raw $499 + $60 + $120 + $300 = $979, rounded to $999.
Anything above $3,999, more than two upstream systems, private hosting, or Enterprise plans are scoped with our team rather than quoted automatically.
What the fee buys that a price list cannot show
- A fixed quote with a promise. If the paid technical review finds a material undocumented difference, we offer an adjusted scope or a full refund before implementation begins.
- A human-validated roadmap within 72 hours of payment, published to your dashboard before any build starts.
- Boundaries by design. Read, write, and guarded tools with confirmations; permission checks on reads; idempotent writes; honest errors. These are the parts that make the integration safe to leave running.
- One server for compatible MCP clients, tested individually. The same endpoint can support ChatGPT, Claude, and other compatible MCP clients. We validate the target clients individually: transport, authentication, protocol versions, and optional features must match. The MCP compatibility specification explains why protocol and extension support must be checked.
How to decide quickly
Run the audit. It costs nothing, asks for no credentials, and returns the proposed tools and an itemized quote in about two minutes. If the quote is lower than the engineering time you would spend, you have your answer. If it is higher, you have a precise list of what the work involves, which is worth having before you start in-house.