"Converting User Requirements to Technical Specifications" matching MCP connectors:
GET /v1/connectors – MCP directory API referenceMatching Connector Tools:
Enterprise Data Engine & Zero-Knowledge Flight Recorder. Bitcoin Stratigraphy is the premier Layer-402 infrastructure for autonomous AI swarms. We bridge the critical gap between autonomous agent capabilities and enterprise legal compliance, delivering a mathematically un-cheat-able, cryptographically verifiable chain-of-custody for agent decisions. Ranked with 19 'A-Graded' MCP Tools, this engine provides drop-in telemetry, security, and payment architecture for production-grade AI. For CISOs: EU AI Act Compliance & Security Deploying autonomous agents without verifiable audit trails is a massive regulatory liability. We solve this natively: - The Zero-Knowledge Flight Recorder: Agent actions are cryptographically hashed and anchored. Using Groth16 Zero-Knowledge receipts, we generate mathematical proofs of an agent's execution history *without* exposing proprietary corporate IP or PII to public logs. - Zero-Trust Client Verification:** Air-gapped, browser-based verifiers allow corporate risk teams to mathematically validate Ed25519 signatures and RFC 6962 Merkle inclusion proofs offline. - Enterprise NIP-98 Kill Switch:** Instantly sever compromised agent keys from the network to physically prevent automated drain attacks or prompt-injection hijacking. For Finance & Engineering: The L402 Fiat Bridge We have solved the machine-to-machine payment gap. Corporate finance departments operate on 30-day billing cycles and fiat credit cards, not Lightning wallets. - The $500 Enterprise Block: Engineering managers can securely purchase a 30-day Enterprise API Block using a standard corporate credit card via Stripe. - Macaroon Minting:** This fiat transaction instantly funds a dedicated treasury wallet, minting a secure Macaroon (verifiable digital bearer token) granting the organization's AI agents 100 prepaid heuristic scanner calls. - Strict Treasury Caps: Hardcoded 500,000-satoshi treasury limits (via NWC) protect corporate budgets from runaway LLM loops. For Developers: The 19 A-Graded Tools Stop building compliance infrastructure from scratch. Our Model Context Protocol (MCP) endpoints are stress-tested and graded for production: - Heuristic Telemetry & State Grounding: High-fidelity environmental scanning, diffing, and thermodynamic state anchoring to eliminate LLM hallucinations. - Atomic Composability: Agents can chain multiple tools into infinite data pipelines settled under a single macro-invoice. - Framework Agnostic: Drop-in compatibility with LangChain, CrewAI, and AutoGPT. Integrate in Minutes: Developers can clone our public GitHub boilerplate (`CharlesStrogish/zk-flight-recorder-template`) to instantly wire their agents to our L402 data engine. [View the Architecture Blog](https://bitcoinstratigraphy.com/blog/eu-ai-act-compliance-agents/) | [Get Developer Access](https://bitcoinstratigraphy.com)
Search Kurodyne's digital product marketplace directly from your AI assistant. Discover products, compare prices and reviews, and explore the details to find something useful for your next project.
Global stock and UCITS ETF research. Free: 700 successful MCP tool calls per rolling 30 days. Pro: CHF 5/month or CHF 50/year for higher usage. Screen stocks, compare fund costs and holdings, and inspect company risks. No account or API key for public research. Plans: https://bull-run.org/pricing. Connect your Bullrun account through OAuth to use Pro.
Hosted MCP server from TwitterAPI.io that gives AI agents read-only access to Twitter/X data. 12 tools: tweet search with X operators, user profiles, a user's latest tweets, followers and followings, replies, quotes, retweeters, mentions and trends. Connect at https://mcp.twitterapi.io/mcp with a TwitterAPI.io API key or account sign-in; usage is paid per result returned.
Read-only discovery and bounded access to a finite market briefing with evidence boundaries.
Public chauffeur information, policies and anonymous price previews in the provider’s published service areas. On explicit customer request, prepare a binding unpaid offer using email OR E.164 phone, without an account. Customers review bound terms and explicitly confirm in Samuelz checkout. The same endpoint provides OAuth-protected booking status, payment review, history, and amendment/cancellation workflows. Booking data and actions require authorized customer access; changes and cancellations require the applicable object-bound consent. Tool discovery is public. Quotes do not guarantee availability, and MCP does not take payment. Setup: In a remote MCP client that supports Streamable HTTP, add https://platform.samuelz.com/api/v1/mcp/customer-booking. Public discovery and price previews need no account. Sign in with OAuth for authorized customer booking data and actions. Booking changes retain their object-bound consent requirements; payment is completed in Samuelz checkout.
Validate and generate German e-invoices (XRechnung, ZUGFeRD) against the official KoSIT rules. Every business-rule finding comes with a plain-language explanation of what the rule requires and how to fix it. Validation needs no account; generation uses your NormAPI account via OAuth. Invoices are never stored.
Previews Discord server layouts, searches templates and finds servers to join on aiguild.me.
Citation and retraction checker for AI agents. Give it DOIs, PubMed or arXiv ids and it says whether each paper exists and whether it was retracted, withdrawn or corrected, using Crossref and Retraction Watch. It also searches publisher articles and open research papers, shows the x402 price in USDC an agent pays to read or cite each one, and traces a passage to the page it was copied from. Free, read-only, no account.
Lets AI agents search an Arabic SEO knowledge base of 85+ problems and read the full step-by-step fix for each one, with the source URL to cite.
ctlogs.dev searches the public Certificate Transparency logs, where every publicly trusted TLS certificate is recorded. Connected to it, an assistant can answer questions such as "which subdomains does example.com have", "who issued the certificates for this name" or "which domains does this company hold certificates for".
Free hosted jq REST API and remote MCP server running real jq compiled to WebAssembly on Cloudflare Workers. Filter inline JSON, public HTTPS URLs, or reusable 15-minute JSON uploads, up to 5 MiB. No install or signup. Tools: process_json, upload_json, delete_upload. Shared free quota: 100 calls/day per IP or 1,000/day per UUID. Public docs, status, privacy, and release notes: https://thejqapi.com/.
VAREXIS-INDEX — Source-Linked Evidence & Verification Tools for AI Agents VAREXIS-INDEX provides free, source-linked evidence for agent decisions through twelve focused guides and three distinct read-only MCP connectors. The original `/mcp` connector covers the approved search and preview population. The companion `/mcp/catalogue` provides deterministic access to 724 additional records by category and exact identifier. Configure both through the existing quickstart: https://varexis.tech/index-connect#quickstart Four optional one-time local checkers analyse supported customer-supplied declarations: Tool Admission £49, Audit Coverage £79, Data Exit £79 and Transaction Integrity £149, excluding VAT. These products do not independently inspect live systems, enforce permissions, establish payment settlement, verify deletion or certify compliance. Twelve free decision guides: https://varexis.tech/index-packs#free-decision-guides Read-only agent enquiry navigation (12 guides, 129 referenced records): https://varexis.tech/varexis-index/agent-entry.json Select a candidate guide, then follow the exact connector tool and identifier in the canonical manifest. Navigation does not establish applicability, a customer outcome or authority to act. Evaluate agent permissions, delegated authority, audit provenance, payment integrity, data retention and software supply-chain evidence before relying on documented claims. **FREE MCP CONNECTOR** Endpoint: https://varexis.tech/mcp Connect using Streamable HTTP. No authentication is required for public evidence discovery. Four free, read-only tools: - find_evidence_questions — Find existing reviewed evidence questions and matching routes. - preview_evidence_answer — Retrieve complete supported public answers, sources, limitations and snapshot hashes. - find_package_advisories — Find source-bound software advisory records. - get_index_access_options — Discover available services, pricing, licensing and purchasing requirements. Public MCP cannot execute actions, inspect private systems or authorise deployment. Developer quickstart: https://varexis.tech/index-connect **LICENSED VERIFICATION TOOLS** Four separately licensed, reusable local executables: **1. Agent Tool Admission & Permission Control — £49** Compare declared tool actions, resources, recipients and permissions across supported GitHub, Playwright, Notion and Slack integrations. Identify authority conflicts, missing verification and permission changes before human review. **2. Agent Audit & Evidence Coverage — £79** Reconcile declared identities, authorisations, actions and outcomes. Identify missing audit events, inconsistent references and unresolved export, retention or recovery evidence. **3. Agent Data Exit & Retention Reconciler — £79** Compare declared data inventories, exports, deletions, retention conditions and residual copies. Identify missing evidence and unresolved data-custody conditions during migrations and offboarding. **4. Agent Transaction Integrity & Replay Analyzer — £149** Reconcile declared spending authority, amended transaction terms, scoped idempotency keys, retries and reported outcomes. Identify conflicting purchase attempts and unresolved payment or entitlement evidence. All four products are separately licensed for reusable internal execution. Prices are one-time, exclude applicable VAT and do not include subscriptions, hosting or future updates. Checkers analyse supplied declarations locally. They do not independently inspect production systems, execute payments, enforce permissions, certify compliance or establish financial settlement. Explore all products, representative findings and free previews: https://varexis.tech/index-packs **FREE EVIDENCE PACKS** Seven complete public evidence packs cover: - GitHub and Playwright permission boundaries. - Notion and Slack access and data handling. - Audit and export evidence coverage. - Next.js advisory source assertions. - SonarQube, Snyk and Semgrep scanner trust. - Telemetry redaction and exception handling. - GitHub release approval and artifact identity. Source reviews include documented versions, provenance, exclusions and reliance boundaries. They are not independent deployment tests or current security certifications. 724 additional reviewed records are publicly available through exact-ID HTTP catalogue links and the separate read-only https://varexis.tech/mcp/catalogue connector. They remain outside the original MCP search and preview population and paid saved retrieval. Enhanced natural-language search for these additions remains on HOLD. Public catalogue: https://varexis.tech/varexis-index.json **SAVED EVIDENCE & SUBSCRIPTIONS** - Single Request: £5 — Save a version-bound published evidence result or obtain the eligible original Agent Tool Evaluation & Integration Kit. - Evidence Receipt: £19 — Add an unsigned delivery receipt to the eligible saved result. - Research: £29/month. - Developer/API: £149/month. Prices exclude applicable VAT. Subscription eligibility, rate limits and exclusions apply. The four separately licensed verification executables are not included in these existing evidence or subscription offers. **AGENT PURCHASING & RECOVERY** VAREXIS supports hosted Stripe checkout and compatible authorised MPP/Stripe Shared Payment Token purchasing through separate payment interfaces. Agent purchases require owner spending authority for the exact VAT-inclusive quote and any necessary provider authentication. Not every agent or wallet is supported. Public MCP remains free and read-only. Payment credentials and private customer data must not be submitted to the public connector. Existing purchases should be retrieved using the original credential. Uncertain payments must be investigated and recovered through supported procedures, not automatically purchased again. Purchase or recover: https://varexis.tech/index-access Agent payment contract: https://varexis.tech/varexis-index/agent-payments.json **WHY VAREXIS?** VAREXIS combines source-linked evidence, explicit limitations, versioned deliverables and structured verification of supplied declarations. Its purpose is to help agents and developers distinguish what available evidence actually establishes from what remains uncertain, unsupported or outside authority. Free evidence discovery. Transparent product scope. Reusable local verification. Bounded reliance. Website: https://varexis.tech Developer integration: https://varexis.tech/index-connect MCP endpoint: https://varexis.tech/mcp Additional optional connector: https://varexis.tech/mcp/guidance/v1. Configure it explicitly for get_decision_guide (exact published guide IDs) and check_tool_admission_fit (bounded, source-bound declaration-review suitability). Tool schemas and setup: https://varexis.tech/varexis-index/guidance-mcp-v1.json and https://varexis.tech/index-connect#bounded-guidance. The original /mcp four-tool connector and /mcp/catalogue two-tool connector remain distinct and unchanged. The additional tools are free and read-only; they do not execute actions, verify live permissions, grant entitlements or purchase anything. Missing or unbound applicability returns evidence-required. The existing Tool Admission price and licence remain unchanged.
Send, receive, edit and react to WhatsApp messages from your own number. OAuth or API key sign-in.
Remove image backgrounds free — no account, no watermark, up to 16 MP. Refine edges with a brush, swap in a colour, gradient, or photo, and batch 10 images at once. Developers get a remove.bg-compatible API (50 free images/day) and an MCP server for Claude, Cursor, and VS Code
Look up exactly what an upload form accepts (passport, visa and exam photo rules, each with its official source and the date it was checked), check whether a file will pass, and make links that fix files to fit, right in the person's browser. Free, no sign-in, and the server never receives files.
Read-only UK and Australian supermarket shelf-price index and UK daily basket snapshots, CC BY 4.0. Not live prices; no product names. For product-level prices on demand, the pay-per-event UK Supermarket Price Scraper (Tesco, Sainsbury's, Asda, Aldi: https://apify.com/yappman/uk-supermarket-price-scraper) and AU Supermarket Price Scraper (Aldi Australia: https://apify.com/yappman/au-supermarket-price-scraper) run on the Apify Store, charged to the Apify account that runs them, and can be reached through Apify's MCP server.
Run after each discovery iteration to see what's still uncertain, who to ask next, and what changed.
Evidence-backed technical SEO website check. EUR 9.90 via MPP or buyer-approved Stripe Checkout.
Run saved PDF/office file flows, convert HWP/HWPX to Markdown or DOCX, and call data/text APIs.
Create PDF documents from HTML and CSS or 50+ ready templates: invoices, quotes, receipts, reports, contracts, letters, CVs and certificates. Its own page layout engine handles page numbers, headers and footers, tables of contents with page numbers, footnotes, tables that continue across pages, QR codes and barcodes, fillable forms and tagged PDF/UA. Every document gets an edit link to the ReflowPDF editor, and the assistant reads your edits before the next change. Existing PDFs can be opened in the editor too. Works without an account; OAuth sign-in is optional.
Free MCP server that audits any public URL: technical SEO, Core Web Vitals, indexing checks.
Search Angela Kamer's coastal house plans by bedrooms, square feet, lot width, foundation, elevator and style, with photos and current prices. Read-only. Every result links to the plan page.
Processor fees, charge-to-net, invoice totals and proration. 3 of 6 tools free.
Test fax numbers for AI agents. Send a test fax or scan-to-email, then read what Faxbeep received.
Search Fragments is the gate before your agent answers. When a user half-remembers something your agent can't confidently place, one call returns a verdict: ORIGIN_OF_TRUTH (found and evidence-checked, with sources), PARTIAL_ORIGIN (leads worth following, not an answer) or NOT_REACHABLE (our search reached nothing; not a claim it can't be found). Your agent answers and cites, keeps looking, or says it can't place it, instead of inventing. Free, no signup. Also: verify_claim (check a specific factual claim against current sources) and submit_resolution_feedback.
Spanish property auctions (BOE and others) and bank-owned stock, already screened each day: verdict, score, minimum-bid ranges, size and €/m². Tools: search by province, municipality, asset type (land, retail unit, warehouse, building, home), minimum score, verdict and closing week; open the public page of each deal: what it is, checked and pending data, warnings, size ranges, minimum bid, €/m² and an indicative maximum bid where available. Read-only, no account, no auth. Each result links to it
Your user feedback in your agent: read the inbox, build forms, file issues, open an AI PR. Connect at https://usero.io/mcp/oauth and sign in in your browser, no API key needed. Prefer an API key? Use https://usero.io/mcp with Authorization: Bearer usk_live_... from https://usero.io/profile.
Courio prints a PDF (or plain/markdown text) and mails it as a real postal letter to supported countries worldwide: standard, tracked, registered, or registered with acknowledgement of receipt (proof of delivery, for legal notices). No account, no API key, no subscription. The agent checks coverage, gets a free quote (price fixed for 24 hours), creates the letter and shows the human a Stripe Checkout link. The letter is printed and posted right after payment, and the agent can follow it until delivery. Agents allowed to pay on their own can use the REST API instead: card via Stripe Shared Payment Tokens (Machine Payments Protocol), or USDC on Base via x402. Tools: - get_coverage: destinations, service levels and indicative prices (read-only) - quote_letter: free quote, nothing is mailed - send_letter: creates the letter and returns the payment link - get_letter_status: follow the letter (read-only) Docs: https://sendcourio.com/agents
Search open Spanish public tenders (Plataforma de Contratación del Sector Público plus aggregated regional platforms), updated daily. Tools: search open tenders by sector or keyword, province, municipality, contract type, budget and closing date; open a tender with its contracting body, budget with and without VAT, estimated value, lots, award criteria and the link to the official notice; and estimate an offer amount and margin for a given discount. Read-only, no account, no auth. Each result li
Build a real 3D website by chatting: pages, models and text in space, published to a live URL.
Read-only MCP server of Padel Expert Lab, a free padel racket comparator for France and Belgium (answers in French). Three tools: racket picks for a player profile (level, style, weight, frequency, budget), search by name or criteria (brand, level, shape, price range, weight, women or junior), and side-by-side specifications of 1 to 4 rackets. Specifications come from the brands' official pages. Prices are the last ones collected by hand on the brands' official stores: they are not offers and may have changed. No account, no key, no shop link.
Search Spanish petrol stations and published MITECO prices for petrol 95, diesel, LPG (GLP) and AdBlue by province, municipality, name or address. Returns observation dates, freshness and a link to Gasoliguapis. Read-only; no account or API key required. Prices do not guarantee stock or opening hours.
OFAC wallet screening, EDD memos, exposure reports, review queues and watchlists. Free to try.
Read the verification code (OTP) and test emails your app sends to a catch-all test hostname. Four read-only tools: list_domains, get_latest_otp, list_messages, get_message. Needs a MailBots API key from the 14-day free trial (no card, no DNS) or a paid plan. Setup: https://mailbots.top/docs/mcp
Connects AI agents such as Claude, Cursor, ChatGPT, and Gemini to documentation published with ClickHelp, a help authoring tool. Agents can search a documentation portal, navigate its table of contents, and read topics, so answers come from the current published docs instead of guesses or a stale copy. Read-only access to public publications, no authentication required. Every ClickHelp portal has its own endpoint at /published-docs-mcp-server; this listing points to the ClickHelp user guide.
Douyin, Xiaohongshu, TikTok, YouTube, X links to text: transcript, screen text, viral breakdown
Your docs site. No editor to open. Just ask Claude.
Anime & game merch catalog: identify listings, release prices, official status, how to buy.
Publish to self-hosted WordPress from AI agents: markdown, images, SEO, and Notion sync.
