Tools
Tools
What an agent can use to get a job done, with prices, limits, setup and data terms read from each provider’s own pages.
Search the web
APIs that return live web results, as links, excerpts or full text.
| Tool | Type | Pricing model | Free tier | Authentication |
|---|---|---|---|---|
| Brave Search API | Hosted API | Prepaid credits, no subscription | $5 in free credits every month | API key in the X-Subscription-Token header |
| Exa | Hosted API | Pay as you go, prepaid credit; no subscription | $10 credit a month, no card | API key; OAuth or keyless for the MCP server |
| Linkup | Hosted API | Pay as you go, prepaid credit balance | $20 credit on sign-up with a professional email, topped up to $20 monthly | API key as Bearer token; x402 payment with USDC needs no account |
| Parallel | Hosted API | Pay as you go, per request | Up to 5,000 requests a month free | API key in x-api-key header; OAuth or no key for the MCP server |
| Perplexity Search API | Hosted API | Prepaid credits; 5.00 USD per 1,000 successful requests (1.00 USD with fast) | Not published | API key as bearer token; OAuth for the remote MCP server |
| SerpApi | Hosted API | Monthly subscription by search count; cancel anytime | 250 searches per month | API key (api_key parameter; Authorization: Bearer header for the MCP server) |
| Tavily | Hosted API | Credits; $0.008 per credit pay as you go, plans down to $0.005 | 1,000 credits a month, no card | API key (bearer); OAuth for the MCP server; keyless for search and extract |
| You.com API | Hosted API | Pay as you go, prepaid credits; keyless pay-per-call by x402 or MPP | $10 credit on sign-up plus $90 after account verification, no card; 100 keyless MCP searches a day | API key in X-API-Key header; OAuth 2.1 for the MCP server; keyless via x402/MPP payment |
Send email
APIs that send, and often receive, email from a domain you own.
| Tool | Type | Pricing model | Free tier | Authentication |
|---|---|---|---|---|
| AgentMail | Hosted API | Monthly or yearly plans (Free, Developer, Startup, Enterprise) with paid add-ons | 3 inboxes, 3,000 emails a month (100 a day), 3 GB storage, no card | API key as bearer token; OAuth for the MCP server |
| Amazon SES | Hosted API | Pay as you go; $0.16 per 1,000 emails on the default Essentials plan, $0.10 à la carte | Up to $200 in AWS Free Tier credits for new AWS customers | AWS IAM credentials (SigV4) for the API; SMTP username and password; OAuth 2.1 or SigV4 for the AWS MCP Server |
| Mailgun | Hosted API | Monthly plans by email volume, with overage per 1,000 emails | Free plan: 100 emails a day, 1 custom sending domain | API key over HTTP basic auth, username api |
| Postmark | Hosted API | Monthly plans by email volume, with a per-1,000 rate above the tier | 100 emails a month, no overages, no card | Server or account API token in a request header; no OAuth |
| Resend | Hosted API | Monthly plans, $20 for 50,000 emails on Pro, overage per 1,000 | 3,000 emails a month, 100 a day | API key; OAuth for the MCP server |
| Twilio SendGrid | Hosted API | Monthly plans by email volume, from $19.95 a month, with overage per extra email | 100 emails a day for 60 days, no card | API key as a Bearer token; API key as SMTP password |
Drive a browser
Tools that let an agent open, click, type into and read real web pages.
| Tool | Type | Pricing model | Free tier | Authentication |
|---|---|---|---|---|
| Anchor Browser | Hosted browser | Usage-based per browser creation, browser hour, proxy GB and AI step; monthly plans with credits | $5 free credits a month, up to 5 concurrent browsers | API key in the anchor-api-key header; OAuth sign-in for the MCP server |
| Browser Use | Hosted browser | Pay as you go, prepaid credits | $1 one-time signup credit | API key in X-Browser-Use-API-Key header; Bearer key for the MCP server |
| Browserbase | Hosted browser | Monthly plan with included browser hours, then per-hour overage | 1 browser hour, 3 concurrent sessions, 15 minutes per session, no card | API key (x-bb-api-key); API key in URL for the hosted MCP server |
| Chrome DevTools MCP | Runs on your machine | Free, open source | Free; no paid plan | None; runs locally |
| Hyperbrowser | Hosted browser | Credits (1,000 credits = $1) from a monthly plan or one-time purchase; browser time billed per hour | 5,000 credits on the Free plan, about 50 browser hours, 1 concurrent session | API key in the x-api-key header; wallet payment (X402) with no account |
| Kernel | Hosted browser | Monthly plan fee plus usage billed per second of browser memory; no charge while a browser is idle | Free plan (named Developer in the docs): $0 a month plus usage, $5 of credits a month, 5 concurrent browsers | API key; OAuth 2.1 for the MCP server |
| Playwright MCP | Runs on your machine | Free, open source | Not applicable; the software is free to run | None; runs locally over stdio |
| Steel | Hosted browser | Usage-based; free Launch plan, $250 a month Scale plan plus usage | $30 one-time credit, valid for 90 days | API key in the steel-api-key header; x402 pay-per-call without a key |
Transcribe audio
Speech in, text out, with speaker labels and word timestamps.
| Tool | Type | Pricing model | Free tier | Authentication |
|---|---|---|---|---|
| Amazon Transcribe | Hosted API | Pay as you go, billed monthly per second of audio | 60 audio minutes a month for the first 12 months | AWS IAM credentials with SigV4-signed requests |
| AssemblyAI | Hosted API | Pay as you go, per hour of audio | $50 in free credits, no card | API key; account sign-in or API key for the MCP server |
| Deepgram | Hosted API | Pay as you go from prepaid credit; Growth plan from $4,000 a year | $200 credit that does not expire, no card | API key in Authorization: Token header; temporary JWT |
| ElevenLabs Scribe | Hosted API | Pay per hour of audio, $0.22 batch and $0.39 realtime | Free plan with 10k credits a month | API key in the xi-api-key header; single-use tokens for client-side use |
| Gladia | Hosted API | Prepaid credit wallet, billed per hour of audio | EUR 50 in credits, one time, valid for one year | API key in the x-gladia-key header |
| Google Cloud Speech-to-Text | Hosted API | Pay as you go per second of audio, with monthly volume tiers per account | 60 minutes a month on the V1 API; the V2 price table lists none | Google Cloud IAM: Application Default Credentials, user credentials or service accounts |
| Groq speech to text | Hosted API | Pay as you go on the Developer tier, billed per hour of audio | Free tier with lower limits (25 MB max file size, 20 requests per minute) | API key sent as a bearer token |
| OpenAI speech to text | Hosted API | Per minute of audio; $0.0045 a minute for gpt-transcribe | Not published | API key sent as a bearer token |
| Speechmatics | Hosted API | Usage-based credits, billed per second at an hourly rate | $100 credit grant, no card | API key as bearer token; temporary JWTs for client-side use |
| whisper.cpp | Runs on your machine | Free, open-source (MIT licence) | Everything is free; no account | None: runs on your machine |
MCP servers and skills
The earlier shelf is still open: 238 live listings, each one passed a daily check before it was shown.