contix herramientas
REMOTE · API.CONTIX.ES
Free no-auth tools for Spain: validate IBAN, EU VAT check (VIES), Modelo 303 sums, Veri*factu dates.
Available components
Last scanned (1 hour ago)
Scores higher than 85% of remote servers
Reachable. Last reached 17 Oct 2026.
Category Finance and Payments
How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. How we score → Why this is hard to score →
Endpoint Security80
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one. See how to fix → View diagnostics → Partial
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- The HSTS (Strict-Transport-Security) header is present. View diagnostics → Pass
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability69
- AI-judged instruction clarity (excellent).Pass
- Context-footprint check failed: tool/resource definitions use about 1121 tokens (~186/item across 6 items; 6 tools + 0 resources), over budget; trim descriptions and params. See how to fix → Fail
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management53
- Stability observed for 16 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage100
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 100% of tool parameters carry a description.Pass
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 6 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 7 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 17 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 50 to 53. That category is still filling its 30-day observation window: 15 days of observed history at the previous scan, 16 at this one. The score rises as the window fills, whether or not the server changes.
- 15 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 43 to 47. That category is still filling its 30-day observation window: 13 days of observed history at the previous scan, 14 at this one. The score rises as the window fills, whether or not the server changes.
- 12 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 33 to 37. That category is still filling its 30-day observation window: 10 days of observed history at the previous scan, 11 at this one. The score rises as the window fills, whether or not the server changes.
- 10 Oct 26 +2
No change was recorded against any check on this day. Stability & Change Management went from 20 to 30. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 9 at this one. The score rises as the window fills, whether or not the server changes.
- 6 Oct 26 +3
- Schema quality: 692 → 1121 ▼ functional
- MCP protocol: fail → pass ▲ functional
- MCP protocol version: 2025-03-26 → 2025-11-25 functional
- 4 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 7 to 10. That category is still filling its 30-day observation window: 2 days of observed history at the previous scan, 3 at this one. The score rises as the window fills, whether or not the server changes.
- 2 Oct 26 +1
- Stability: unverified → 0.03 ▲ functional
- 1 Oct 26 70
First indexed and scored.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 17 Oct 2026 · Probed https://api.contix.es/api/v1/mcp/herramientas
TLS valid
Negotiated TLS 1.3 with TLS_AES_256_GCM_SHA384 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=api.contix.es | CN=YR2,O=Let's Encrypt,C=US | 31 Aug 2026 | 29 Nov 2026 | RSA 2048 | SHA256-RSA | 6da72d4fedd119a26aa2ef1030b74e6d2ed |
| SANs: api.contix.es | ||||||
| CN=YR2,O=Let's Encrypt,C=US (CA) | CN=Root YR,O=ISRG,C=US | 3 Sept 2025 | 2 Sept 2028 | RSA 2048 | SHA256-RSA | 4ebd24947e24d394802d84a52fd5b319 |
| CN=Root YR,O=ISRG,C=US (CA) | CN=ISRG Root X1,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | RSA 4096 | SHA256-RSA | f24b6d17f9d9ad7cb1c9fea78782699f |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of api.contix.es. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| es. | present | 54404 | 8 | Verified |
| contix.es. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
| Header | Value |
|---|---|
| strict-transport-security | max-age=31536000 |
| content-security-policy | frame-ancestors 'none' |
| x-content-type-options | nosniff |
| x-frame-options | DENY |
| referrer-policy | strict-origin-when-cross-origin |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://api.contix.es/api/v1/mcp/herramientas | Verified | 200 | |
| http (plaintext) | http://api.contix.es/api/v1/mcp/herramientas | HTTPS enforced | 301 | https://api.contix.es/api/v1/mcp/herramientas |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
calculate_modelo_303 Sum the Spanish VAT return (Modelo 303) ~236
Add up the boxes (casillas) of the Spanish quarterly VAT return Modelo 303 with the formulas printed on the official AEAT form: 27, 45, 46, 64, 66, 87, 69 and 71. Input are the tax amounts (cuotas) per box, e.g. {"09": 17430, "29": 9870}. It only sums what it is given: it does not decide which rate or deduction applies and it is not a tax return.
| Name | Type | Req | Description |
|---|---|---|---|
| casillas | object | yes | Box number -> amount. Accepted: 152, 167, 03, 155, 06, 09, 11, 13, 15, 158, 170, 18, 21, 24, 26, 29, 31, 33, 35, 37, 39, 41, 42, 43, 44, 58, 76, 65, 77, 110, 78, 68, 108, 70, 109 |
No output schema declared.
No examples provided.
calculate_vat Calculate VAT (IVA) and IRPF withholding ~242
Compute the taxable base, VAT (IVA) amount, optional recargo de equivalencia and optional IRPF withholding from an amount. By default `importe` is the taxable base (sin IVA). With incluye_iva=true, `importe` is the TOTAL with VAT already included and the base is derived backwards (quitar IVA / reverse VAT). It only applies the rates it is given: it does NOT decide which VAT or IRPF rate applies to a case.
| Name | Type | Req | Description |
|---|---|---|---|
| importe | number|string | yes | Amount: taxable base, or total with VAT if incluye_iva=true |
| incluye_iva | boolean | – | True if `importe` already includes VAT (reverse calculation) |
| irpf | number|string | – | IRPF withholding rate in %, e.g. 15, 19. Default 0 |
| recargo | number|string | – | Recargo de equivalencia rate in %, e.g. 5.2, 1.4, 0.5, 1.75. Default 0 |
| tipo_iva | number|string | yes | VAT rate in %, e.g. 21, 10, 4, 0 |
No output schema declared.
No examples provided.
check_vat_number Check an EU VAT number (VIES) ~116
Look up an EU VAT number in the European Commission's VIES registry. Returns what the registry says: whether the number exists and, where the member state publishes it, the name and address. It draws NO tax conclusion. VIES is often down; that is reported as disponible=false, which is NOT the same as an invalid number.
| Name | Type | Req | Description |
|---|---|---|---|
| numero | string | yes | VAT number, with or without country prefix |
| pais | string | – | ISO country code (e.g. DE); omit when the number carries its prefix |
No output schema declared.
No examples provided.
get_obligation_dates Veri*factu and e-invoicing deadlines (Spain) ~143
Deadlines from the published Spanish rules: Veri*factu (RD 1007/2023, dates of RD-ley 15/2025) and mandatory B2B e-invoicing (RD 238/2026, counted from the ministerial order, provisional while the order is a draft). Information about the rules, not advice.
| Name | Type | Req | Description |
|---|---|---|---|
| factura_a_empresas | boolean | yes | Invoices other businesses or professionals in Spain |
| forma | string | yes | sociedad = company paying Impuesto sobre Sociedades; autonomo = self-employed |
| mas_8_millones | boolean | – | Turnover above 8 million EUR last year |
No output schema declared.
No examples provided.
validate_iban Validate an IBAN ~118
Check whether an IBAN is well formed: country length (SWIFT IBAN registry) and ISO 13616 check digits. For Spanish IBANs also the two account check digits (DC) and the bank (entidad) with its BIC from the Banco de España registry. A 20-digit Spanish account number (CCC) is converted to its IBAN. Pure arithmetic: it does NOT confirm that the account exists or who owns it.
| Name | Type | Req | Description |
|---|---|---|---|
| iban | string | yes | IBAN or 20-digit Spanish account, spaces allowed |
No output schema declared.
No examples provided.
validate_spanish_tax_id Calculate/validate a Spanish DNI, NIE or CIF check character ~172
Two modes in one input. If `valor` is only 1-8 digits, computes the DNI check letter and returns the full 8-digit-plus-letter DNI (digits are left-padded with zeros). If `valor` is a full document, validates its check character: DNI (8 digits + letter), NIE (X/Y/Z + 7 digits + letter) or CIF (entity letter + 7 digits + check digit or letter, with the entity type per Orden EHA/451/2008). Tolerates spaces, dots, dashes and an ES prefix. Pure arithmetic: it does NOT confirm the document exists, is active or belongs to the person who gave it.
| Name | Type | Req | Description |
|---|---|---|---|
| valor | string | yes | 1-8 digits, or a full DNI/NIE/CIF |
No output schema declared.
No examples provided.
How do I install the contix herramientas MCP server?
contix herramientas is a hosted endpoint at https://api.contix.es/api/v1/mcp/herramientas, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
remote · api.contix.es
claude mcp add --transport http es-contix-herramientas 'https://api.contix.es/api/v1/mcp/herramientas'
What is the contix herramientas MCP server?
contix herramientas is an MCP server listed in the public MCP registry as es.contix/herramientas. Free no-auth tools for Spain: validate IBAN, EU VAT check (VIES), Modelo 303 sums, Veri*factu dates. This page covers its hosted endpoint (https://api.contix.es/api/v1/mcp/herramientas).
Is the contix herramientas MCP server safe to use?
contix herramientas scores 80 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.
What tools does the contix herramientas MCP server expose?
contix herramientas exposes 6 tools: calculate_vat, validate_spanish_tax_id, validate_iban, check_vat_number, calculate_modelo_303, get_obligation_dates. Their descriptions and schemas cost roughly 1,027 tokens of context every time the server is loaded.
Does the contix herramientas MCP server require authentication?
No. We connected to contix herramientas without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the contix herramientas MCP server still maintained?
contix herramientas is still listed as active in the MCP registry. We last reached this channel on 17 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.