"Finding MCP servers with high ratings and no API key required" matching MCP tools:

• rotate_key

  BorealHost

  Atomically rotate an API key. Old key is immediately invalidated. Creates a new key with the same name, scopes, and rate limits. The new key is returned once — store it immediately. Requires: API key with write scope. Args: key_id: UUID of the API key to rotate (get from whoami()) Returns: {"api_key": "bh_...", "key_id": "uuid", "prefix": "bh_...", "scopes": ["read", "write"], "message": "Key rotated. Store securely."} Note: The old key stops working immediately. Update BOREALHOST_API_KEY right away.

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• strale_execute

  Strale - 290+ API capabilities for AI agents

  Executes a Strale capability by slug and returns the result. Use this when you need to perform any verification, validation, lookup, or data extraction from the 271-capability registry. Call strale_search first to find the right slug and required input fields. Returns a result object with the capability output, quality score (SQS), latency, price charged, and data provenance. Five free capabilities work without an API key (10/day limit). Paid capabilities debit from the wallet — check strale_balance first for high-value calls.

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• generate_3d_model

  Sats4AI - Bitcoin-Powered AI Tools

  Convert a single photo into a textured 3D GLB model. Uses Seed3D — generates accurate geometry and materials from one image. Async — returns requestId, poll with check_job_status. 350 sats per model. Pay per request with Bitcoin Lightning — no API key or signup needed. Requires create_payment with toolName='generate_3d_model'.

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• strale_ping

  Strale - 290+ API capabilities for AI agents

  Checks that the Strale API is reachable and the MCP server is running. Call this before a series of capability executions to verify connectivity, or when troubleshooting connection issues. Returns server status, version, tool count, capability count, solution count, and a timestamp. No API key required.

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• register

  BorealHost

  Register a new agent account and get an API key. No authentication needed. The returned API key grants read+write access to all BorealHost API endpoints. Store it securely — it cannot be retrieved again. The key is automatically activated for this session — all subsequent tool calls will use it. No extra configuration needed. If no email is provided, a synthetic agent identity is created (agent-{uuid}@api.borealhost.ai). If an email is provided, it links to an existing or new human account. Args: name: Human-readable name for this API key (default: "Agent Key") email: Optional email to link to a human account Returns: {"api_key": "bh_...", "key_id": "uuid", "prefix": "bh_...", "scopes": ["read", "write"], "account_id": "uuid", "message": "Store this API key securely..."} Errors: RATE_LIMITED: Max 5 registrations per IP per hour VALIDATION_ERROR: Invalid email format

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• transcribe_audio

  Sats4AI - Bitcoin-Powered AI Tools

  Transcribe audio to text with timestamps. Uses Mistral Transcription — high-accuracy speech recognition that handles accents, background noise, and overlapping speakers. 13 languages: en, zh, hi, es, ar, fr, pt, ru, de, ja, ko, it, nl. Up to 512 MB / 3 hours per file. Async — returns requestId, poll with check_job_status(jobType='transcription'), then get_job_result. 10 sats/min. Privacy: audio and transcripts are ephemeral — processed, returned, and discarded. Never persisted. Pay per request with Bitcoin Lightning — no API key or signup needed. Requires create_payment with toolName='transcribe_audio'.

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• set_api_key

  BorealHost

  Set your BorealHost API key for this session. Call this if you already have an API key (from a previous registration, checkout completion, or the BorealHost panel). All subsequent tool calls will use this key for authentication. No need to call this after register() — the key is set automatically. Args: api_key: Your BorealHost API key (format: bh_<48 hex chars>) Returns: {"success": true, "message": "API key set for this session", "key_prefix": "bh_..."}

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• register_agent

  Arcology Knowledge Node

  Register as an agent to get an API key for authenticated submissions. Registration is open — no approval required. Returns an API key that authenticates your proposals and tracks your contribution history. IMPORTANT: Save the returned api_key immediately. It is shown only once and cannot be retrieved again. Args: agent_name: A name identifying this agent instance (2-100 chars) model: The model ID (e.g., "claude-opus-4-6", "gpt-4o")

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• authenticate

  AI Agents Overflow

  Authenticate with your saved API key. Read your key from ~/.agents-overflow-key and pass it here. Call this at the START of every session before using any other tools.

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• mcpAccount

  AILANG Parse

  View account info, pricing, entitlements, or list keys. Actions: "status" (default) → tier, quota, usage from /me/entitlements "pricing" → public pricing tiers (no auth required) "keys" → list user's API keys with per-key usage "usage" → alias for "keys" (per-key usage is shown there)

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• discovery_add_payment_method

  Disco

  Attach a Stripe payment method to your Disco account. The payment method must be tokenized via Stripe's API first — card details never touch Disco's servers. Required before purchasing credits or subscribing to a paid plan. To tokenize a card, call Stripe's API directly: POST https://api.stripe.com/v1/payment_methods with the stripe_publishable_key from your account info. Args: payment_method_id: Stripe payment method ID (pm_...) from Stripe's API. api_key: Disco API key (disco_...). Optional if DISCOVERY_API_KEY env var is set.

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• discovery_signup

  Disco

  Create a Disco account and get an API key. Provide an email address to start the signup flow. If email verification is required, returns {"status": "verification_required"} — the user will receive a 6-digit code by email, then call discovery_signup_verify to complete signup and receive the API key. The free tier (10 credits/month, unlimited public runs) is active immediately. No authentication required. Returns 409 if the email is already registered. Args: email: Email address for the new account. name: Display name (optional — defaults to email local part).

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• request_api_key

  Nefesh — Real-Time Human State Awareness for AI

  Request a free Nefesh API key. No existing API key needed for this call. IMPORTANT: You MUST ask the user for their real email address before calling this tool. Do NOT invent, guess, or generate an email address. The user will receive a verification link they must click to activate the key. Without clicking that link, no API key will be issued. Disposable or temporary email services are blocked. Example prompt to the user: "What is your email address? You will receive a verification link to activate your free API key." Flow: call this with the user's real email, then poll check_api_key_status every 10 seconds until status is 'ready'. Free tier: 1,000 calls/month, all signal types, 10 req/min. No credit card.

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• get_guide

  Octodamus Market Intelligence

  Purchase the Build the House trading system guide via x402 on Base. Returns step-by-step x402 payment instructions. After completing the EIP-3009 payment ($29 USDC on Base), the API returns a download_url valid for 30 days. No API key required to purchase.

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• example_plans

  PlanExe

  Returns a curated list of example plans with download links for reports and zip bundles. Use this to preview what PlanExe output looks like before creating your own plan. Especially useful when the user asks what the output looks like before committing to a plan. No API key required.

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• vf_health

  VoiceFlip

  Returns VoiceFlip MCP server health and version metadata. No authentication required. Use this first to verify the server is reachable from your MCP client.

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• workspace_switch

  DialogBrain

  Re-point the active MCP API key to a different workspace. Pass exactly one of `workspace_id` or `slug` (find them via `workspace.list`). Takes effect on the very next tool call — no MCP reconnect, no new API key. Sequential checkpoint: do not parallelize tool calls across a switch — calls already in flight when the switch commits will run against the previous workspace.

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• revoke_api_key

  BorealHost

  Revoke (deactivate) an API key. The key stops working immediately. Requires: API key with write scope. Args: key_id: UUID of the key to revoke (from list_api_keys or whoami) Returns: {"success": true, "message": "API key revoked"} Errors: NOT_FOUND: Key not found or already revoked

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• discovery_login

  Disco

  Get a new API key for an existing Disco account. Sends a 6-digit verification code to the email address. Call discovery_login_verify with the code to receive a new API key. Use this when you need an API key for an account that already exists (e.g. the key was lost or this is a new agent session). Returns 404 if no account exists with this email — use discovery_signup instead. Args: email: Email address of the existing account.

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• colorize_image

  Sats4AI - Bitcoin-Powered AI Tools

  Colorize black-and-white or grayscale photos. DDColor (dual-decoder, ICCV 2023) — vivid, natural colorization. Impossible for text/vision LLMs. 5 sats per image, pay per request with Bitcoin Lightning — no API key or signup needed. Requires create_payment with toolName='colorize_image'.

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