# Edge Thirteen

> AI-run value-investing research, delivered every Friday. Each week the system screens roughly 5,000 U.S. public companies straight from their SEC filings, applies Benjamin Graham's quantitative tests (profitability, balance-sheet strength, price vs. earnings and book value, margin of safety), then reads the 10-K and latest quarterly filing of every name that clears the screen to separate a genuine value pick from a value trap. Subscribers get the resulting picks — the good, the traps to avoid, and the overhyped to skip — by email.

Edge Thirteen is not a stock tipster or a hype feed. It publishes a full, unedited track record (wins and losses) and explains its reasoning in plain English, grounded in filings rather than headlines or sentiment. It costs $13/month; a full sample issue is available free with no card required.

## Key pages

- [How it works](https://www.edgethirteen.com/how-it-works): the value-investing method (Graham + Buffett) and the exact weekly screening pipeline.
- [Track record](https://www.edgethirteen.com/track-record): the human-readable, unedited history of every pick and its return.
- [Track record feed](https://www.edgethirteen.com/api/track-record): the same track record as machine-readable JSON.
- [Archive](https://www.edgethirteen.com/archive): past weekly issues.
- [Picks index](https://www.edgethirteen.com/picks): individual case-study pages per ticker, once the 90-day embargo clears.
- [Graham Number Calculator](https://www.edgethirteen.com/tools/graham-number-calculator): free tool to compute Benjamin Graham's fair-value estimate and margin of safety for any stock, given EPS and book value per share.
- [DCF Calculator](https://www.edgethirteen.com/tools/dcf-calculator): free discounted cash flow / intrinsic value calculator using multi-year free-cash-flow projections and a terminal value.
- [Altman Z-Score Calculator](https://www.edgethirteen.com/tools/altman-z-score-calculator): free bankruptcy-risk / financial-distress score from five balance-sheet ratios, ticker lookup included.
- [Engineering notes: the EDGAR table-of-contents parsing bug](https://www.edgethirteen.com/notes/edgar-filing-parsing-bug): a technical write-up of a real bug in the filing-extraction pipeline (naive heading search matched the table of contents, not the real section) and the scoring-based fix, with real code.
- [Engineering notes: Stripe MPP agent payments, fiat not crypto](https://www.edgethirteen.com/notes/mpp-agent-payments-fiat-not-crypto): real bugs found building a per-request payable endpoint for AI agents on Stripe's Machine Payments Protocol.
- [Engineering notes: the FFIEC TSV .strip() bug](https://www.edgethirteen.com/notes/ffiec-tsv-strip-bug): a technical write-up of a silent field-mapping bug in bank Call Report parsing (a leading blank cell eaten by .strip() shifted every field one column off) caught by cross-checking one real bank's numbers.
- [Engineering notes: SEC.gov User-Agent 403](https://www.edgethirteen.com/notes/sec-edgar-user-agent-403): why a generic crawler gets silently blocked fetching SEC filings, and how to tell a real access-policy block from a genuinely dead link.
- [Engineering notes: the dividend-yield grounding bug](https://www.edgethirteen.com/notes/dividend-yield-grounding-bug): a real error in a sent newsletter issue (dividend yield estimated by the write-up model instead of pulled from filed data), the actual wrong numbers, the pipeline fix, and the free tool (NumberCheck) built to catch this class of bug going forward.
- [Edge Thirteen Industry Primers](https://www.edgethirteen.com/tools/industry-primers): $79 one-time industry research report — the AI data center power & cooling supply chain (Vertiv, nVent, Eaton, Comfort Systems), with real revenue and margin figures sourced from each company's own SEC 10-K.
- [Bank Stress Dataset](https://www.edgethirteen.com/tools/bank-stress-dataset): $299 one-time CSV — every FDIC-insured bank's AOCI burden, uninsured deposit ratio, and NPL ratio, computed from public FFIEC Call Report filings.
- [Tariff Refund Screen](https://www.edgethirteen.com/tools/tariff-refund-screen): $99 one-time CSV — 160 public companies disclosing IEEPA tariff-refund figures in their own SEC filings (money accounting rules keep off every stock screener until it's received), sized against each company's revenue and equity, with a citation and filing URL per figure.
- [ValueFeed](https://www.edgethirteen.com/tools/valuefeed): $49/mo weekly SEC-sourced value-investing research packet licensed for independent newsletter writers.
- [APIDrift](https://www.edgethirteen.com/tools/apidrift): $19/mo weekly + urgent breaking-change alerts for engineering teams building on LLM APIs (OpenAI, Anthropic, Google, xAI, and more).
- [HubSpot legacy-to-DBV migration map](https://github.com/mjaack/hubspot-dbv-map): free, derived by diffing HubSpot's own public OpenAPI specs -- every legacy v1-v4 endpoint's date-based-versioning replacement and field-level breaking differences, six months before HubSpot's own docs ship (March 2027). $29/mo DBV Watch for ongoing re-diff against your own endpoint inventory.
- [AdvisorLetter](https://www.edgethirteen.com/tools/advisor-letter): $79/mo weekly white-label market-commentary draft for financial advisors to review and send under their own name.
- [MeterKit](https://www.edgethirteen.com/tools/meterkit): $99 one-time event-sourced credit ledger + correct 2026 Stripe Billing Meter integration for Next.js AI/SaaS products, source code you own.
- [killcord](https://www.edgethirteen.com/tools/killcord): free / $15 Pro dead-man's switch for Anthropic API spend — deactivates the API key the instant a threshold is crossed instead of just alerting.
- [Stripe Checkup for VS Code](https://www.edgethirteen.com/tools/stripe-checkup-vscode): free extension that catches Stripe webhook and checkout bugs as you type — signature verification, subscription.updated vs .deleted, checkout metadata, no account or network call.
- [Kanban Next](https://www.edgethirteen.com/tools/kanban-next): free / $19 Pro maintained Kanban board plugin for Obsidian — opens boards from the archived 2.67M-download Kanban plugin byte-for-byte unchanged; Pro adds swimlanes and embedded boards.
- [CheckoutScan](https://www.edgethirteen.com/tools/checkout-scan): free Chrome extension that scans the checkout page you're on for raw card fields, missing HTTPS, or a live test key — one click, nothing leaves the browser.
- [ExploitWatch](https://www.edgethirteen.com/tools/exploit-watch): free check / $299 report — checks dependencies against CISA's live KEV catalog, generates EU CRA Article 14 report fields, and sells an Exposure Report that triages every match likely/possible/name-collision, computes the 24h/72h/14-day Article 14 clock, pre-fills the ENISA early-warning fields per finding, and fingerprints the catalog version it ran against.
- [DROP Compliance Kit](https://www.edgethirteen.com/tools/drop-compliance-kit): $49 — 45-day check-in calendar and deletion-log template for California data brokers under the Delete Act.
- [AI Disclosure Kit](https://www.edgethirteen.com/tools/ai-disclosure-kit): $59 — ready-to-use EU AI Act Article 50 disclosure text, embeddable banner, and compliance record template for chatbots, AI-generated media, and biometric features.
- [Comment Letter Check](https://www.edgethirteen.com/tools/commentlettercheck): free preview / $39 report — see if the SEC has ever sent a company a comment letter, and how severe it was.
- [NumberCheck](https://www.edgethirteen.com/tools/numbercheck): free — paste a draft with $TICKER mentions and it flags EPS, revenue, book value, or market cap figures that don't match the company's actual SEC filings.
- [PumpCheck](https://www.edgethirteen.com/tools/pumpcheck): free — check whether an npm package's download count reflects real adoption or carries the signature of "download pumping", where rapid-fire version publishes trick registry mirrors into inflating the counter. $299 audits a whole package.json or lockfile.
- [RenewalMatrix](https://www.edgethirteen.com/tools/renewal-matrix): free preview / $49 report — scores a cancellation flow against federal, CA, CO, VT, and OR click-to-cancel laws.
- [Pay Transparency Job Posting Checker](https://www.edgethirteen.com/tools/postingcheck): free preview / $19 report — scans a job posting against all 15 states + DC pay-transparency disclosure laws.
- [RewardsGuard](https://www.edgethirteen.com/tools/rewards-guard): free check / $19 report — checks a TikTok creator's posting history against Creator Rewards disqualification signals.
- [Chargeback Response Letter Generator](https://www.edgethirteen.com/tools/chargeback-response): $39 — generates a Stripe/PayPal/Square dispute response letter from order details.
- [StackLedger](https://www.edgethirteen.com/tools/stackledger): free preview / $19 report — paste a SaaS subscription list, see total spend and overlapping tools instantly.
- [AccessProof](https://www.edgethirteen.com/tools/accessproof): free scan / $39 report — ADA website-accessibility scan and timestamped evidence report, up to 5 pages.
- [CloakCheck](https://www.edgethirteen.com/tools/cloakcheck): free scan / $29 report — scans a site for hidden content designed to hijack an AI shopping or support agent.
- [VercelPyCheck](https://www.edgethirteen.com/tools/vercelpycheck): free scan / $9 repo scan — catches known Vercel Python deploy footguns before shipping.
- [TriageShield](https://www.edgethirteen.com/tools/triageshield): free check / $19/mo team plan — checks a pasted vulnerability report's file/line/function claims against the real repo, no LLM verdict.
- [KDPCheck](https://www.edgethirteen.com/tools/kdpcheck): free preview / $9 report — checks what Amazon KDP's AI-disclosure rules require, and scans a manuscript for mechanical prose patterns.
- [SlopCheck](https://www.edgethirteen.com/tools/slopcheck): free check / $19 report — checks a YouTube channel's recent uploads against YouTube's 2026 inauthentic-content policy.
- [NexusGuard](https://www.edgethirteen.com/tools/nexusguard): WooCommerce plugin, free scan / $29/mo — reads a store's own order history and flags which US states it has crossed an economic-nexus threshold in (both dollar and transaction-count tests), with the crossing date, obligation start date, and statute citation.
- [LegacyLens](https://www.edgethirteen.com/tools/legacylens): WooCommerce plugin, $19 report — names every integration still calling WooCommerce's removed Legacy REST API, maps each endpoint to its wc/v3 replacement, and gives a safe-to-remove verdict after 30 quiet days.
- [TaxTable](https://www.edgethirteen.com/tools/taxtable): WooCommerce plugin, free for one state / $79/yr — loads a state's own published sales-tax rate and boundary files straight into WooCommerce's native tax table, no Jetpack or third-party tax service required.
- [Odoo US Sales Tax, Offline](https://www.edgethirteen.com/tools/odoo-us-tax): Odoo addon, free for Utah / $149/yr for more states — computes US sales tax inside Odoo's own database from each state's published rate and boundary files, zero outbound API calls per order.
- [MarkdownPro](https://www.edgethirteen.com/tools/markdownpro): JetBrains IDE plugin, free — native Swing Markdown preview that doesn't go blank on Wayland or over SSH, unlike the bundled JCEF-based preview; one-click export to standalone HTML.

## MCP servers

Machine-callable tools for AI coding/research agents (JSON-RPC over HTTP, no auth, no signup):

- `check_vercel_python_project` at https://www.edgethirteen.com/api/mcp/vercelpycheck — scans a public GitHub repo for known Vercel Python-runtime deploy footguns.
- `check_sec_comment_letters` at https://www.edgethirteen.com/api/mcp/commentlettercheck — looks up whether a US-listed ticker has SEC comment-letter correspondence on file, with filing count and most recent date.
- `check_financial_numbers` at https://www.edgethirteen.com/api/mcp/numbercheck — checks $TICKER-tagged numeric claims (EPS, revenue, book value, market cap, assets, liabilities) in a piece of text against that company's actual SEC EDGAR filings.
- `check_npm_download_trust` at https://www.edgethirteen.com/api/mcp/pumpcheck — checks whether an npm package's public download count reflects genuine sustained usage, returning npm's headline 30-day figure alongside a spike-resistant estimate of real usage, busiest-day concentration, recent version-flood bursts, and a clean/unreliable/inflated verdict.
- `compute_graham_number` at https://www.edgethirteen.com/api/mcp/graham-number-calculator — Benjamin Graham's fair-value ceiling and margin of safety for a US-listed ticker (EPS/book value looked up automatically, or pass them directly).
- `compute_altman_z_score` at https://www.edgethirteen.com/api/mcp/altman-z-score-calculator — bankruptcy-risk Z-Score and zone (safe/grey/distress) for a US-listed ticker, all seven inputs looked up automatically.
- `compute_dcf` at https://www.edgethirteen.com/api/mcp/dcf-calculator — discounted-cash-flow intrinsic value per share from free-cash-flow/growth/discount/terminal-growth assumptions, with optional ticker for margin of safety.
- `check_page_accessibility` at https://www.edgethirteen.com/api/mcp/accessproof — scans a live web page's markup for the WCAG failures ADA demand letters cite most often.
- `check_page_for_agent_hijacking` at https://www.edgethirteen.com/api/mcp/cloakcheck — scans a URL for content planted to hijack an AI shopping/browsing agent rather than inform a human visitor.
- `check_tiktok_rewards_risk` at https://www.edgethirteen.com/api/mcp/rewardsguard — spot-checks a TikTok creator's exported video list for Creator Rewards disqualification-risk signals.
- `verify_vulnerability_report` at https://www.edgethirteen.com/api/mcp/triageshield — checks a vulnerability report's file/line/function claims against a real public GitHub repo's current contents.
- `check_dependencies_against_kev` at https://www.edgethirteen.com/api/mcp/exploitwatch — checks a dependency list against CISA's live Known Exploited Vulnerabilities catalog.
- `check_job_posting_pay_transparency` at https://www.edgethirteen.com/api/mcp/postingcheck — scans job posting text against 16 US state/DC pay-transparency disclosure laws.
- `check_manuscript_for_ai_slop_patterns` at https://www.edgethirteen.com/api/mcp/kdpcheck — scans manuscript text for AI-generated-prose patterns before publishing to Amazon KDP.
- `audit_saas_subscriptions` at https://www.edgethirteen.com/api/mcp/stackledger — audits a pasted SaaS subscription list for redundant-category overlap and overspend.
- `check_youtube_channel_slop_risk` at https://www.edgethirteen.com/api/mcp/slopcheck — checks a YouTube channel's recent uploads against YouTube's 2026 inauthentic-content policy.
- `check_renewal_cancellation_compliance` at https://www.edgethirteen.com/api/mcp/renewal-matrix — scores a subscription cancellation flow against federal, CA, CO, VT, and OR click-to-cancel laws.
- `draft_chargeback_response_checklist` at https://www.edgethirteen.com/api/mcp/chargeback-response — drafts a dispute-evidence checklist and letter preview for a Stripe/PayPal/Square chargeback.
- `check_drop_next_deadline` at https://www.edgethirteen.com/api/mcp/drop-compliance-kit — checks a California data broker's next DROP 45-day deletion-request deadline.
- `get_advisor_letter_info` at https://www.edgethirteen.com/api/mcp/advisor-letter — pricing/details lookup for AdvisorLetter, a weekly white-label market-commentary draft for financial advisors.
- `get_sample_issue` at https://www.edgethirteen.com/api/mcp/advisor-letter — returns a real sample AdvisorLetter issue, free.
- `get_apidrift_info` at https://www.edgethirteen.com/api/mcp/apidrift — pricing/details lookup for APIDrift, weekly + urgent breaking-change alerts for teams building on LLM provider APIs.
- `get_recent_breaking_changes` at https://www.edgethirteen.com/api/mcp/apidrift — returns real, dated example LLM-provider breaking changes, free.
- `get_hubspot_dbv_info` at https://www.edgethirteen.com/api/mcp/hubspot-dbv — pricing/details lookup for the HubSpot legacy-to-DBV migration map.
- `lookup_hubspot_endpoint` at https://www.edgethirteen.com/api/mcp/hubspot-dbv — looks up a legacy HubSpot API path and returns its date-based-versioning replacement and breaking differences, free, full data.
- `list_hubspot_breaking_changes` at https://www.edgethirteen.com/api/mcp/hubspot-dbv — lists HubSpot operations with a breaking or removed date-based-versioning replacement, optionally filtered by API name.
- `get_meterkit_info` at https://www.edgethirteen.com/api/mcp/meterkit — pricing/details lookup for MeterKit, a Stripe usage-billing code kit for Next.js AI/SaaS products.
- `get_meterkit_bug_fix_sample` at https://www.edgethirteen.com/api/mcp/meterkit — returns a free real code sample from MeterKit fixing a common Stripe webhook access-revocation bug.
- `get_valuefeed_info` at https://www.edgethirteen.com/api/mcp/valuefeed — pricing/details lookup for ValueFeed, a weekly SEC-sourced value-investing research packet licensed for newsletter writers.
- `get_sample_screen` at https://www.edgethirteen.com/api/mcp/valuefeed — returns a real sample Graham/Buffett value screen with a filing excerpt, free.
- `get_killcord` at https://www.edgethirteen.com/api/mcp/killcord — fetches the killcord script (a dead-man's switch that deactivates an Anthropic API key the instant spend crosses a limit) plus a ready-to-run setup snippet.
- `get_ai_disclosure_kit_info` at https://www.edgethirteen.com/api/mcp/ai-disclosure-kit — pricing/details lookup for AI Disclosure Kit, EU AI Act Article 50 transparency text and compliance record template for chatbots, generated media, and biometric features.
- `check_article50_disclosure` at https://www.edgethirteen.com/api/mcp/ai-disclosure-kit — checks whether EU AI Act Article 50 applies to one AI touchpoint and returns a sample disclosure sentence, free.
- `audit_site_accessibility_and_agent_safety` at https://www.edgethirteen.com/api/mcp/site-audit — discovers a website's pages from its sitemap and samples them for WCAG accessibility failures and AI-agent prompt-injection risk.
- `screen_us_company` at https://www.edgethirteen.com/api/mcp/us-diligence — due diligence on a US company from official federal records: SEC EDGAR filer registration, Treasury OFAC SDN sanctions name screening, USAspending.gov federal contract and grant awards, and federal court dockets via CourtListener/RECAP. Free screen.
- `get_bank_stress_dataset_info` at https://www.edgethirteen.com/api/mcp/bank-stress-dataset — pricing/details lookup for the US Bank Regulatory Stress Dataset, a CSV of every FDIC-insured bank's balance-sheet stress metrics from its own FFIEC Call Report.
- `lookup_bank_stress_metrics` at https://www.edgethirteen.com/api/mcp/bank-stress-dataset — looks up one FDIC-insured bank's stress metrics from its own FFIEC Call Report, free.
- `get_industry_primer_info` at https://www.edgethirteen.com/api/mcp/industry-primers — pricing/details lookup for the current Edge Thirteen Industry Primer, a one-time research report sourced to each covered company's own SEC 10-K.
- `get_primer_preview_table` at https://www.edgethirteen.com/api/mcp/industry-primers — returns the free FY2025 revenue/margin/growth preview table for the current Industry Primer, free.
- `get_tariff_refund_screen_info` at https://www.edgethirteen.com/api/mcp/tariff-refund-screen — pricing/details lookup for the Tariff Refund Screen, a CSV of companies disclosing IEEPA tariff-refund figures in their own SEC filings that no XBRL-based stock screener can see.
- `get_tariff_refund_screen_preview` at https://www.edgethirteen.com/api/mcp/tariff-refund-screen — returns the free top-10 preview table ranked by IEEPA refund as % of equity, free.
- `get_stock_metric` at https://www.edgethirteen.com/api/mcp/voicebrief — one financial metric (revenue, EPS, market cap, book value per share, etc.) for a US public company, grounded in its most recent SEC 10-K and phrased as a single spoken sentence with units spelled out (no "$391B", no markdown) for a voice assistant to read aloud. Free.
- `get_stock_snapshot` at https://www.edgethirteen.com/api/mcp/voicebrief — a short spoken financial snapshot (revenue, EPS, market cap, book value per share) of a US public company, grounded in its most recent SEC 10-K. Free.
- edgethirteen-gateway at https://www.edgethirteen.com/api/mcp/gateway — single endpoint exposing all 43 tools across 32 Edge Thirteen products (numbercheck, accessproof, exploitwatch, us-diligence, voicebrief, etc.), each tool prefixed <slug>__<toolname>.
- edgethirteen-lite at https://www.edgethirteen.com/api/mcp/lite — the same 43 tools behind a low-context facade of just two tools, `discover_tools` (search the catalog in plain English, get the schema for only what you need) and `call_tool` (dispatch by name). Its tools/list manifest is ~350 tokens versus the gateway's ~8,100, so it costs an agent far less context per turn.

## Facts worth quoting

- Price: $13/month, free sample issue available, no card required for the trial.
- Universe screened weekly: ~5,000 U.S. public companies, sourced from SEC EDGAR filings.
- Methodology: Graham's quantitative value tests (profitability, current ratio, low P/E and P/B, Graham number, margin of safety) combined with an AI reading of each candidate's actual 10-K and latest quarterly filing.
- Every pick is published with its outcome — no cherry-picking, embargoed 90 days after the call to prevent front-running, then made public permanently.
- Delivery: Friday morning email.