> For the complete documentation index, see [llms.txt](/llms.txt). [◆ miniwebtool /api](/) [Tools](/tools/) [Docs](/docs/) [Reference](/v1/docs) [Pricing](/#pricing) [Log in](/dashboard/login/) [Start free](/billing/checkout/?plan=free) - [Home](/) - › - [Tools](/tools/) - › - [Webmaster](/tools/#webmaster) - › - CPM Calculator API # CPM Calculator API webmaster 1 credits / call v2026-04-22 Calculate campaign cost, CPM, or impressions from two known advertising metrics. Use this endpoint to add CPM Calculator to your app, site, workflow, or agent without rebuilding formulas, validation, examples, and docs. Prefer the browser version? [Open the CPM Calculator on miniwebtool.com](https://miniwebtool.com/cpm-calculator/). [Start free — get a key →](/billing/checkout/?plan=free) 1,000 credits · no card · 30 seconds What this saves Skip a custom implementation, validation rules, examples, OpenAPI shape, billing checks, and support copy for this utility. Where it fits Product forms, calculator pages, finance content, education flows, support tools, automations, and agent actions. How to evaluate Inspect the required fields, try the hosted playground, then copy cURL, Python, or Node code into your integration. ### Endpoint ```text POST https://api.miniwebtool.com/v1/tools/cpm-calculator/run ``` ### Request body Field Type Req. `solve_for` cost | cpm | impressions `str` — `campaign_cost` `float | None` — `cpm` `float | None` — `impressions` `float | None` — ### Cost & access - 1 credit per successful call. - Starts on: Free. - Max payload: 65536 bytes. - Privacy mode:`hash_only` - Available on: free, starter, pro, business, scale ### Response envelope ```text { "request_id": "01K...", "tool": "cpm-calculator", "tool_version": "2026-04-22", "credits_used": 1, "result": {... } } ``` ### Try it API key * Stored only in this browser tab. Playground test key is prefilled and only works on this page. [Get a live key →](/billing/checkout/?plan=free) solve_for (str) cost cpm impressions cost | cpm | impressions campaign_cost (float | None) cpm (float | None) impressions (float | None) Send request → Response copy body This endpoint starts on Free Your key is valid, but its current plan cannot call`cpm-calculator`. Upgrade to Free or higher to run this tool. [Start Free →](/billing/checkout/?plan=free) [Compare plans](/#pricing) ```text ``` Response headers ```text ``` ### Code examples cURL Python JavaScript PHP Ruby Go Java copy ```text curl -X POST https://api.miniwebtool.com/v1/tools/cpm-calculator/run \ -H 'Authorization: Bearer mwt_live_YOUR_KEY' \ -H 'Content-Type: application/json' \ -d '{"solve_for":"cost","cpm":5,"impressions":100000}' ``` copy ```text import requests resp = requests.post( 'https://api.miniwebtool.com/v1/tools/cpm-calculator/run', headers={'Authorization': 'Bearer mwt_live_YOUR_KEY'}, json={'solve_for': 'cost', 'cpm': 5, 'impressions': 100000}, ) resp.raise_for_status() print(resp.json()) ``` copy ```text const resp = await fetch( 'https://api.miniwebtool.com/v1/tools/cpm-calculator/run', { method: 'POST', headers: { 'Authorization': 'Bearer mwt_live_YOUR_KEY', 'Content-Type': 'application/json', }, body: JSON.stringify({"solve_for":"cost","cpm":5,"impressions":100000}), } ); const data = await resp.json(); console.log(data); ``` copy ```text true, CURLOPT_RETURNTRANSFER => true, CURLOPT_HTTPHEADER => [ 'Authorization: Bearer mwt_live_YOUR_KEY', 'Content-Type: application/json', ], CURLOPT_POSTFIELDS => json_encode([ 'solve_for' => 'cost', 'cpm' => 5, 'impressions' => 100000 ]), ]); $resp = curl_exec($ch); curl_close($ch); print_r(json_decode($resp, true)); ``` copy ```text require 'net/http' require 'json' require 'uri' uri = URI('https://api.miniwebtool.com/v1/tools/cpm-calculator/run') http = Net::HTTP.new(uri.host, uri.port) http.use_ssl = (uri.scheme == 'https') req = Net::HTTP::Post.new(uri) req['Authorization'] = 'Bearer mwt_live_YOUR_KEY' req['Content-Type'] = 'application/json' req.body = { 'solve_for' => 'cost', 'cpm' => 5, 'impressions' => 100000 }.to_json resp = http.request(req) puts JSON.parse(resp.body).inspect ``` copy ```text package main import ( "bytes" "encoding/json" "fmt" "io" "net/http" ) func main() { body, _:= json.Marshal(map[string]interface{}{ "solve_for": "cost", "cpm": 5, "impressions": 100000, }) req, _:= http.NewRequest("POST", "https://api.miniwebtool.com/v1/tools/cpm-calculator/run", bytes.NewReader(body)) req.Header.Set("Authorization", "Bearer mwt_live_YOUR_KEY") req.Header.Set("Content-Type", "application/json") resp, err:= http.DefaultClient.Do(req) if err!= nil { panic(err) } defer resp.Body.Close() out, _:= io.ReadAll(resp.Body) fmt.Println(string(out)) } ``` copy ```text import java.net.URI; import java.net.http.*; var client = HttpClient.newHttpClient(); var req = HttpRequest.newBuilder() .uri(URI.create("https://api.miniwebtool.com/v1/tools/cpm-calculator/run")) .header("Authorization", "Bearer mwt_live_YOUR_KEY") .header("Content-Type", "application/json") .POST(HttpRequest.BodyPublishers.ofString("{\"solve_for\":\"cost\",\"cpm\":5,\"impressions\":100000}")) .build(); var resp = client.send(req, HttpResponse.BodyHandlers.ofString()); System.out.println(resp.body()); ``` ## How to call CPM Calculator - 1 Get an API key [Get an API key](/billing/checkout/?plan=free). Sign up free for a bearer token. 1,000 credits/month, no card. - 2 Assemble the JSON body Required fields:. See the Request body table below for the full schema. - 3 POST to`https://api.miniwebtool.com/v1/tools/cpm-calculator/run` Headers:`Authorization: Bearer `and`Content-Type: application/json`. Copy-paste snippets in 7 languages are under Code examples. - 4 Parse the response Envelope:`{request_id, tool, tool_version, credits_used, result}`. The typed output lives in`result`. ## Frequently asked What does the CPM Calculator API do? ▾ Calculate campaign cost, CPM, or impressions from two known advertising metrics. Use it to add this utility without rebuilding formulas, validation, examples, and documentation. How much does one call to CPM Calculator cost? ▾ 1 credit per successful call. Failed calls (validation errors, 5xx) don't bill. What parameters does the CPM Calculator API require? ▾ Required fields: (none). Full schema at /v1/openapi.json. Is the CPM Calculator API deterministic? ▾ Yes — same input, same output, forever. Tool version 2026-04-22; output shape is stable within a major version. Can an AI agent call the CPM Calculator API? ▾ Yes. Connect to https://api.miniwebtool.com/v1/mcp over the Model Context Protocol. The agent discovers `cpm-calculator` with its JSON Schema automatically, so the model can plan while MiniWebtool handles the exact tool result. What format does the API return? ▾ JSON with a stable envelope: `{request_id, tool, tool_version, credits_used, result}`. Errors are RFC 7807 `application/problem+json`. ## Use from an AI agent Every endpoint on this site is also exposed via the [Model Context Protocol](/docs/#mcp) at`https://api.miniwebtool.com/v1/mcp`. Claude, Cursor, and any MCP-capable agent can discover this tool (`cpm-calculator`) and its JSON Schema automatically — no client codegen. ```text # List tools the agent can call curl -s https://api.miniwebtool.com/v1/mcp \ -H 'Content-Type: application/json' \ -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}' \ | jq '.result.tools[] | select(.name=="cpm-calculator")' ``` ## Related webmaster tools [ CPC Calculator Calculate CPC, CPM, or CTR from two known campaign metrics. ](/tools/cpc-calculator/) [ IP Address to Binary Converter Convert IPv4 or IPv6 addresses to padded binary forms. ](/tools/ip-address-to-binary-converter/) [ JSON String Escape/Unescape Escape or unescape JSON string content deterministically. ](/tools/json-string-escape-unescape/) [ Value of A Visitor Calculator Calculate website visitor value, conversion rate, annualized revenue, and traff… ](/tools/value-of-a-visitor-calculator/) © 2026 miniwebtool. API is a separate product from the consumer site. 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