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Open Finance, Nexus and Docs

Financial and tax APIs. For those who build.

Open Finance, reconciliation and tax invoices in simple APIs, with an MCP server for agents and a free plan to get started.

Request accessDocumentation

Itaú

CHECKING_ACCOUNT

synced

currentBalance

R$47,635.27

Credit card

R$ 3,184.40

open statement

Investments

R$ 212,540.00

CDB, 110% of CDI

Transactions

TRANSACTIONS_CREATED
  • PIXPix received+ 1,284.90
  • BOLETOBoleto paid- 612.35
  • TEDTED receivedPENDING+ 9,450.00

Clients and partners

  • Santander
  • Nuvemshop
  • Tray
  • Unisuam
  • Kora Saúde
  • Fiotec
  • NDD
  • Reserva
  • Avocado Pay
  • CF Contabilidade
  • SolarGrid
  • Transfero
  • RioCard Mais
  • WAM Group

Integrate today

One API key, one HTTP call and JSON back. Pick a product and run the example.

curl -X POST "$OPENI_API/v1/connect-sessions" \
  -H "Authorization: Bearer $OPENI_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{ "redirectUrl": "https://app.suaempresa.com.br/callback" }'

# The response includes the connectUrl.
# After connecting, the user returns to:
# https://app.suaempresa.com.br/callback?itemId=...&status=success

Response

Press Run to see the response and the webhooks it triggers.

Simulation using the examples from the documentation.

One platform, three APIs. For teams that would rather read the documentation than book a meeting.

Simple API

REST, JSON and key authentication. Ready-made examples and a Postman collection in the documentation.

Agent-ready

An MCP server and llms.txt on every product, so your agents can read the documentation and operate the API.

Start free

A free plan on all three products and monthly plans from R$ 59.90, with a usage allowance included.

Open Finance. Your users' bank data, by consent.

Accounts, transactions and investments in a single format. Use the hosted widget or build the whole flow through the API.

Explore Open Finance

Select your institution

Your financial institution

  • Itaú
  • Bradesco
  • Santander
  • Nubank
  • Inter

Connect, the connection widget

Institution, credentials and OAuth in a hosted interface. Login data never passes through your application.

POST https://app.yourcompany.com/webhooks/openi

  1. ITEM_CREATED

    Item created, waiting for the user

    200

  2. ITEM_LOGIN_SUCCEEDED

    User authorized at the bank

    200

  3. TRANSACTIONS_CREATED

    New transactions available

    200

Webhooks on every change

Item and transaction events reach your endpoint, with retries and idempotency guidance.

Nexus. Reconciliation that runs on its own.

Ingest data from webhooks, files, Postgres or Open Finance. A rule set matches two datasets and returns each pair with a decision and a score.

Explore Nexus
transacoes_banco_xrule setnotas_erp
  • Pix received 482911,284.90
    MATCH
    NF 104721,284.90
  • TED 771209,450.00
    MATCH
    NF 104669,450.00
  • Boleto 30018612.35
    POSSIBLE
    NF 10459612.35
  • Bank fee18.90
    NO_MATCH
    no pair

Docs. Tax invoices issued by API.

NF-e, NFS-e and NFCom with asynchronous processing, batch download and a webhook for every invoice event.

Explore Docs

Sales NF-e

draft
natureza_operacao
Venda
data_emissao
2024-05-12
nome_emitente
Razao Social Emitente Ltda
uf_emitente
SP
  • POST/v1/invoices/product/sent
  • 200{ "invoiceId": "pi_1234567890", "status": "processing" }
  • webhooksent-product-invoice

One POST to issue

The API validates the data, returns the invoiceId and reports the result by webhook. Cancellation and correction letters in the same API.

Every document

NF-e, NFS-e, NFS-e Nacional and NFCom, issued and received, with single or batch download.

In production. In the numbers of those who already integrated.

Clients running Open Finance, reconciliation and tax invoices on the same APIs as the documentation. Each block opens its case.

See all cases

Start free, subscribe when you grow

Every product has a free plan and monthly plans with an included quota. Above the quota, you pay only for the overage.

  • Free plan on all three products
  • Monthly plans with an included quota
  • Overage billed per unit, at a public price
See plans and pricingRequest access
Open Finance50 active consents
fromR$ 279.90/month
Nexus5,000 events per month
fromR$ 359.90/month
Docs100 invoices per month
fromR$ 59.90/month
“We integrated Open Finance in one sprint. The documentation answers before we need to ask.”
Marina DuarteHead of Engineering, credit fintech
“The reconciliation that took the team two days now runs on its own.”
Rafael AntunesCTO, retail chain

Teams from fintechs, retail and accounting already integrate with Openi.

Request access

Start with the documentation. Request access when you want to test.

Read the endpoints, copy the examples and request credentials to run the calls on your account.

Request accessDocumentation