Brazil CNPJ company registry
REMOTE · CNPJ-MCP.FLY.DEV
Brazil's open CNPJ registry: filter and count companies by sector, place, size, MEI, partners.
Available components
Last scanned (8 hours ago)
Scores higher than 46% of remote servers
Reachable. Last reached 18 Oct 2026.
Category CRM and Sales
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 Security57
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- Authorisation not fully verified: no authorisation is required to call this server, and 8 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe. See how to fix → View diagnostics → Unverified
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- HSTS check failed: the Strict-Transport-Security header is absent. See how to fix → View diagnostics → Fail
- 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 Usability55
- AI-judged instruction clarity (good).Pass
- Context-footprint check failed: tool/resource definitions use about 1917 tokens (~239/item across 8 items; 8 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 Management27
- Stability observed for 8 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage71
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 0% of tool parameters carry a description.Fail
- Structured output schemas are declared (50% of tools); any adoption earns full credit.Pass
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 8 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 9 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 20 to 23. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 7 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 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.
- 13 Oct 26 +1
- Tool “search_companies” rewrote its description, which is the text the model reads security
- 12 Oct 26 +1
- Stability: unverified → 0.07 ▲ functional
- 10 Oct 26 58
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 18 Oct 2026 · Probed https://cnpj-mcp.fly.dev/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=*.fly.dev | CN=YE1,O=Let's Encrypt,C=US | 21 Aug 2026 | 19 Nov 2026 | ECDSA 256 | ECDSA-SHA384 | 688c4daf5300c51e0a5c1f6837a3a67a868 |
| SANs: *.fly.dev | ||||||
| CN=YE1,O=Let's Encrypt,C=US (CA) | CN=Root YE,O=ISRG,C=US | 3 Sept 2025 | 2 Sept 2028 | ECDSA 384 | ECDSA-SHA384 | 5ddd70dd31f801c85c186a7a04b80afe |
| CN=Root YE,O=ISRG,C=US (CA) | CN=ISRG Root X2,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | ECDSA 384 | ECDSA-SHA384 | 872165fc34b6e5fba8add5b3705fb53a |
| CN=ISRG Root X2,O=Internet Security Research Group,C=US (CA) | CN=ISRG Root X1,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | ECDSA 384 | SHA256-RSA | 6c8f1dc727c7117f7baf853ac980f9cd |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of cnpj-mcp.fly.dev. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| dev. | present | 60074 | 8 | Verified |
| fly.dev. | 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 |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://cnpj-mcp.fly.dev/mcp | Verified | 200 | |
| http (plaintext) | http://cnpj-mcp.fly.dev/mcp | HTTPS enforced | 301 | https://cnpj-mcp.fly.dev/mcp |
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 →
companies_at_address ~90
Establishments registered at one address, by CEP (8 digits), optionally narrowed by street text, number, municipio or uf. Use it to find companies sharing an address.
| Name | Type | Req | Description |
|---|---|---|---|
| cep | – | – | – |
| limit | integer | – | – |
| logradouro_contains | – | – | – |
| municipio | – | – | – |
| numero | – | – | – |
| offset | integer | – | – |
| situacao | – | – | – |
| uf | – | – | – |
| Name | Type | Req | Description |
|---|---|---|---|
| result | array | yes | – |
No examples provided.
count_companies ~509
Count companies or establishments, optionally grouped by one or two fields. Filters (all optional, combined with AND): cnae (CNAE code or prefix, e.g. '4711' or '47', list ok; add include_secondary to also match secondary activities), cnae_secao (letter A-U), uf, municipio (name as in Receita, accents ignored), municipio_codigo, situacao (ativa, baixada, suspensa, inapta, nula), matriz_only, porte (micro = ME, pequeno = EPP, demais, nao_informado), natureza_juridica (code prefix like '2062' or text like 'sociedade limitada'), capital_min/capital_max (BRL), opened_from/opened_to (data_inicio_atividade, YYYY-MM or YYYY-MM-DD), closed_from/closed_to (data da baixa), mei, simples (true/false), name_contains (razao social or nome fantasia), cep, partner_name (a partner's name contains this text). group_by options: uf, municipio, cnae_principal, cnae_divisao, cnae_secao, natureza_juridica, porte, situacao, ano_abertura, mes_abertura, ano_baixa, mes_baixa, mei, simples, matriz_filial, motivo_situacao. unit='estabelecimentos' (default) counts every CNPJ incl. filiais; unit='empresas' counts companies (matriz only). metric='sum_capital' sums declared capital social (BRL, companies only). Examples: MEIs opened per month in a state, active agro companies per municipality, closures by year.
| Name | Type | Req | Description |
|---|---|---|---|
| capital_max | – | – | – |
| capital_min | – | – | – |
| cep | – | – | – |
| closed_from | – | – | – |
| closed_to | – | – | – |
| cnae | – | – | – |
| cnae_secao | – | – | – |
| group_by | – | – | – |
| include_secondary | boolean | – | – |
| limit | integer | – | – |
| matriz_only | boolean | – | – |
| mei | – | – | – |
| metric | string | – | – |
| municipio | – | – | – |
| municipio_codigo | – | – | – |
| name_contains | – | – | – |
| natureza_juridica | – | – | – |
| opened_from | – | – | – |
| opened_to | – | – | – |
| order | string | – | – |
| partner_name | – | – | – |
| porte | – | – | – |
| simples | – | – | – |
| situacao | – | – | – |
| uf | – | – | – |
| unit | string | – | – |
| Name | Type | Req | Description |
|---|---|---|---|
| result | array | yes | – |
No examples provided.
dataset_info ~36
What data is loaded: source, snapshot month, row counts, field meanings and caveats. Call first if unsure what the tools cover.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
get_company ~73
One company by CNPJ (14 digits, with or without punctuation; or the 8-digit root to get the matriz): registration, company data, Simples/MEI, address and contacts, secondary CNAEs, partners (with names), and how many establishments the company has.
| Name | Type | Req | Description |
|---|---|---|---|
| cnpj | string | yes | – |
No output schema declared.
No examples provided.
list_partners ~137
Partners (socios) of one company by CNPJ root or full CNPJ: names, type, role (qualificacao), entry date, age band. CPFs are masked by Receita. faixa_etaria: 1 = 0-12, 2 = 13-20, 3 = 21-30, 4 = 31-40, 5 = 41-50, 6 = 51-60, 7 = 61-70, 8 = 71-80, 9 = over 80, 0 = not applicable.
| Name | Type | Req | Description |
|---|---|---|---|
| cnpj | string | yes | – |
| Name | Type | Req | Description |
|---|---|---|---|
| result | array | yes | – |
No examples provided.
lookup_codes ~93
Look up Receita's code tables by text or code. kind: cnae (activity), natureza_juridica (legal form), municipio, motivo (reason for status), qualificacao (partner role), pais. Use it to find the CNAE code for a sector, or the municipio name Receita uses, before filtering.
| Name | Type | Req | Description |
|---|---|---|---|
| kind | string | yes | – |
| limit | integer | – | – |
| text | string | yes | – |
| Name | Type | Req | Description |
|---|---|---|---|
| result | array | yes | – |
No examples provided.
search_companies ~684
Find companies/establishments matching filters. Filters (all optional, combined with AND): cnae (CNAE code or prefix, e.g. '4711' or '47', list ok; add include_secondary to also match secondary activities), cnae_secao (letter A-U), uf, municipio (name as in Receita, accents ignored), municipio_codigo, situacao (ativa, baixada, suspensa, inapta, nula), matriz_only, porte (micro = ME, pequeno = EPP, demais, nao_informado), natureza_juridica (code prefix like '2062' or text like 'sociedade limitada'), capital_min/capital_max (BRL), opened_from/opened_to (data_inicio_atividade, YYYY-MM or YYYY-MM-DD), closed_from/closed_to (data da baixa), mei, simples (true/false), name_contains (razao social or nome fantasia), cep, partner_name (a partner's name contains this text). Returns up to 100 rows per page, ordered by opening date (newest first) unless order_by is capital_social or razao_social. Use count_companies for 'how many' questions. Set include_contacts to add email, phones, full address and a registry_contact_quality block (0-100 score of how likely the REGISTERED email/phone from Receita is a real direct contact, with the signals behind it; it says nothing about the website) and, when the company's own website was crawled, a separate website_contacts block (WhatsApp, phones, emails, social profiles found on its public pages, each with source_url). A whatsapp_business block appears only when a WhatsApp Business account was found on one of the registered phones (display name, account type, name_match score, checked_at); phones are checked in the background after a query shows them, so a result can appear on a later call, and its absence says nothing about whether the number is on WhatsApp. min_contact_score keeps only companies whose REGISTERED contact (the email and phones on the Receita record, not the website) scores at or above it. Pass an integer 0-100, or a tier name: 'high' = 85, 'medium' = 50, 'low' = 0 (e.g. min_contact_score=50 or 'medium' for medium and hig…
| Name | Type | Req | Description |
|---|---|---|---|
| capital_max | – | – | – |
| capital_min | – | – | – |
| cep | – | – | – |
| closed_from | – | – | – |
| closed_to | – | – | – |
| cnae | – | – | – |
| cnae_secao | – | – | – |
| include_contacts | boolean | – | – |
| include_secondary | boolean | – | – |
| limit | integer | – | – |
| matriz_only | boolean | – | – |
| mei | – | – | – |
| min_contact_score | – | – | – |
| municipio | – | – | – |
| municipio_codigo | – | – | – |
| name_contains | – | – | – |
| natureza_juridica | – | – | – |
| offset | integer | – | – |
| opened_from | – | – | – |
| opened_to | – | – | – |
| order_by | string | – | – |
| partner_name | – | – | – |
| porte | – | – | – |
| simples | – | – | – |
| situacao | – | – | – |
| uf | – | – | – |
No output schema declared.
No examples provided.
search_partners ~128
Find the companies a person or entity is a partner of, by name. Exact (accent-insensitive, case-insensitive) match on the partner name by default; set contains=true for a substring match. Optionally narrow with cpf_middle (the 6 digits Receita publishes, e.g. '240659') because the same name can belong to different people. Returns company name, status and role.
| Name | Type | Req | Description |
|---|---|---|---|
| contains | boolean | – | – |
| cpf_middle | – | – | – |
| limit | integer | – | – |
| name | string | yes | – |
| offset | integer | – | – |
| uf | – | – | – |
No output schema declared.
No examples provided.
How do I install the Brazil CNPJ company registry MCP server?
Brazil CNPJ company registry is a hosted endpoint at https://cnpj-mcp.fly.dev/mcp, 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 · cnpj-mcp.fly.dev
claude mcp add --transport http bnovarini-cnpj-mcp 'https://cnpj-mcp.fly.dev/mcp'
What is the Brazil CNPJ company registry MCP server?
Brazil CNPJ company registry is an MCP server listed in the public MCP registry as io.github.bnovarini/cnpj-mcp. Brazil's open CNPJ registry: filter and count companies by sector, place, size, MEI, partners. This page covers its hosted endpoint (https://cnpj-mcp.fly.dev/mcp).
Is the Brazil CNPJ company registry MCP server safe to use?
Brazil CNPJ company registry scores 62 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 Brazil CNPJ company registry MCP server expose?
Brazil CNPJ company registry exposes 8 tools: dataset_info, search_companies, count_companies, get_company, list_partners, and 3 more. Their descriptions and schemas cost roughly 1,750 tokens of context every time the server is loaded.
Does the Brazil CNPJ company registry MCP server require authentication?
No. We connected to Brazil CNPJ company registry without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the Brazil CNPJ company registry MCP server still maintained?
Brazil CNPJ company registry is still listed as active in the MCP registry. We last reached this channel on 18 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.