Fr Legal Kit

French legal helpers for agents: e-invoice, L441-10, SIRET/IBAN. $0.01 USDC x402

Quick Install

Automated & IDE Setup

Copy the AI prompt to install this server into Claude Code, Cursor, or another agent — or use 1-click editor setup below.

Add to Cursor Add to VS Code

Manual Client & Custom JSON ConfigExpand JSON ▾

Client Config & Setup

Choose your client or environment

Target File:~/Library/Application Support/Claude/claude_desktop_config.json

claude_desktop_config.json

{
  "mcpServers": {
    "fr-legal-kit": {
      "command": "npx",
      "args": [
        "-y",
        "fr-legal-kit"
      ]
    }
  }
}

💡 Paste the JSON block into your client's configuration file under mcpServers, then restart the application.

Documentation Overview

fr-legal-kit

x402 API for AI agents. Offline French legal helpers. $0.01 USDC on Base per call. No INSEE, no scrape, no PDP.

Live: https://fr-legal-kit.monnet-yanis1.workers.dev

MCP registry: io.github.CartonPliant/fr-legal-kit
x402scan: https://www.x402scan.com/server/edab7902-3c37-4463-97ef-fa115c225b8d
AgentCash: npx agentcash add https://fr-legal-kit.monnet-yanis1.workers.dev

Routes

POST	What
`/v1/einvoice-who`	Who must receive e-invoices since 1 Sep 2026 vs emit (GE/ETI 2026, PME/micro 2027)
`/v1/late-penalties`	L441-10 C. com. interest (BCE MRO +10 pts, H2-2026 default 2.40%) + 40 € (D.441-5)
`/v1/due-date`	Invoice date + net days; next open day skipping L.3133-1 holidays 2026–2027
`/v1/holidays`	Metropolitan public holidays (11 in 2026, Easter Monday 6 Apr)
`/v1/payment-term-max`	Agreed-term ceiling: 60 days after invoice, or 45 days EOM if stipulated (L441-10 I)
`/v1/tva-rate`	Indicative VAT 20 / 10 / 5.5 / 2.1
`/v1/mention-fields`	Checklist of L441-9 / 293 B / L441-10 mention field ids
`/v1/vat-key`	FR intra-community VAT id from SIREN (CGI 286 ter formula, not VIES)
`/v1/penalty-text`	Collable L441-10 + D.441-5 mention strings (12,40 % + 40 €)
`/v1/franchise-293b`	2026 293 B thresholds (37 500 / 85 000 €) + statutory mention
`/v1/dunning-steps`	Relance calendar J+1 / J+8 / J+15 after due date (usage; L441-10 sans rappel)
`/v1/open-days`	Inclusive open-day count between two dates (skip weekend + L.3133-1)
`/v1/invoice-numbering`	L441-9 chronological sequence: next number + no-gap rules
`/v1/amount-words`	French amount in words (12,40 → douze euros et quarante centimes)
`/v1/alsace-holidays`	Alsace-Moselle extras (Good Friday + St Stephen) + combined calendar
`/v1/due-date-eom`	45 jours fin de mois (L441-10 I): month-end+45 and +45-then-EOM
`/v1/ht-ttc`	HT ↔ TTC at CGI rates 20 / 10 / 5.5 / 2.1 / 0
`/v1/days-late`	Calendar days from due_date to as_of (input for late-penalties)
`/v1/siren-from-siret`	SIRET → SIREN + NIC + checksums + VAT key (no INSEE)
`/v1/quote-validity`	Devis validity calendar (default 30 days, usage not L441-9)
`/v1/ape-naf`	APE/NAF rev.2 format (4 digits + letter, e.g. 62.01Z). No INSEE
`/v1/postcode-fr`	5-digit postcode → department (2A/2B, 97x, Alsace-Moselle flag)
`/v1/legal-form`	Extra invoice mentions by form (EI/micro vs SAS/SARL capital+RCS)
`/v1/iban-fr`	FR IBAN 27 chars: bank / branch / account / RIB key + ISO checksum
`/v1/credit-note`	Avoir: next AV- number + CGI 289 mention of original invoice (L441-9, no reuse)
`/v1/phone-fr`	FR phone format (ARCEP): 10 digits / +33 → E.164 + invoice mention. No lookup
`/v1/capital-social`	Share-capital mention (SAS au capital de 1 000,00 €). EI/micro: none
`/v1/rcs-mention`	RCS + greffe city + SIREN (`RCS Pau 404 833 048`). Format, not a Kbis
`/v1/invoice-currency`	EUR legal tender; foreign ccy OK, VAT in euros. No FX
`/v1/escompte`	L441-10 early-payment discount mention, or « Pas d'escompte… »
`/v1/acompte`	Down-payment invoice: AC- number, 30% default, remaining TTC (CGI 289)
`/v1/date-fr`	Invoice date JJ/MM/AAAA + weekday (L441-9 emission date format)
`/v1/payment-means`	Means of payment mention (virement / chèque / CB / …) L441-9
`/v1/interest-start`	L441-10: interest starts the calendar day after the due date
`/v1/siege-social`	Siège social mention: street + CP + city (L441-9, not a Kbis)
`/v1/net-a-payer`	Invoice footer HT/TVA/TTC + « Net à payer : 1 200,00 € »
`/v1/doc-title`	CGI 289 title: Facture / Avoir / acompte / note d'honoraires / Devis
`/v1/autoliquidation`	Reverse-charge VAT mention (CGI 283 / BTP 283-2 nonies / import)
`/v1/eori`	FR EORI = FR + SIREN (format only, no customs lookup)
`/v1/duplicata`	Copy of an invoice: same number, stamped DUPLICATA (not a new invoice)
`/v1/rm-mention`	Artisan RM + city + SIREN (`RM Pau 404 833 048`). Format, not a D1
`/v1/buyer`	L441-9 client identification: name + optional SIRET/SIREN + city
`/v1/unit`	Line unit of measure (heure / jour / forfait / …) + optional qty
`/v1/cgv`	L441-6 CGV mention (« Nos conditions générales de vente s'appliquent. »)
`/v1/reserve-propriete`	Retention-of-title clause (L.624-16) until full payment. Goods only
`/v1/garantie-legale`	Consumer legal warranty 2 years from delivery (C. conso L.217-3)
`/v1/mediateur`	Consumer mediator mention (C. conso L.612-1). B2C only
`/v1/delivery`	Date of supply vs invoice date (CGI 289 / 242 nonies A)
`/v1/line`	L441-9 invoice line: designation + qty/unit + unit price HT
`/v1/page`	Multi-page invoice footer: Page X/Y
`/v1/retractation`	14-day consumer withdrawal (L.221-18). B2C distance/off-premises
`/v1/conservation`	Keep the invoice 10 years (L123-22) / 6 years tax (LPF L102 B)
`/v1/prescription`	Payment action: 5 years B2B (L110-4) or 2 years B2C (L.218-2)
`/v1/garantie-commerciale`	Commercial warranty (L.217-21), distinct from the 2-year legal one
`/v1/export`	VAT exemption: CGI 262 extra-EU or 262 ter I intra-EU
`/v1/proforma`	Pro forma header — not an invoice (CGI 289)
`/v1/jours-francs`	Jours francs (CPC 642): start day out, weekend/holiday rolls
`/v1/clause-penale`	Contractual penalty clause (C. civ. 1231-5), not L441-10
`/v1/periode`	Billing period from/to for continuous services (CGI 289)
`/v1/autofacturation`	Self-billing stamp (CGI 289), optional seller name
`/v1/rgpd`	Invoice data footer: RGPD 6.1.b/c + 10-year keep
`/v1/langue`	French language mention (Toubon B2C / tax-control B2B)
`/v1/commande`	Purchase-order number (+ optional date) on the invoice
`/v1/debours`	Disbursements out of the VAT base (CGI 267)
`/v1/arrhes`	Arrhes (C. civ. 1590), distinct from acompte — seller returns double
`/v1/prorata`	Calendar prorata of a monthly HT over from/to
`/v1/check-siret`	SIRET/SIREN checksum only
`/v1/check-iban`	IBAN ISO 13616 checksum only
`POST /mcp`	MCP JSON-RPC: `tools/list` free, `tools/call` $0.01

See /llms.txt on the host. Isolated SKU — not Devis d’abord, not Fiche Pleine, not Ibis.

Related paid API: fr-invoice-mentions (mention blocks, $0.02).

Read the full README →View source on GitHub →

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Frequently Asked Questions about Fr Legal Kit

Add the following block to your claude_desktop_config.json under mcpServers: "mcpServers": { "fr-legal-kit": { "command": "npx", "args": ["-y", "fr-legal-kit"] } }

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Technical Specs & Signals

CategoryFinance & Fintech

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