B3 (Brasil Bolsa Balcão)
B3 S.A. - Brasil, Bolsa, Balcão is the Brazilian exchange and financial market infrastructure operator formed by the 2017 merger of BM&FBOVESPA and Cetip, running trading, clearing, central depository, and OTC registration for equities, derivatives, fixed income, and FX. Its public B3 for Developers portal documents 114 B2B REST APIs (OAuth 2.0 client credentials and ROPC) across investor-area, OTC (Balcão), listed-markets, Tesouro Direto, Banco B3, and insurance domains. Real-time market data is distributed through the UMDF multicast feed (FIX/FAST and Binary SBE, L1/L2) via authorized distributors, and end-of-day plus reference data through the UP2DATA file service (TXT/CSV/JSON/XML via client software or cloud). All API and data access is contract-gated for institutions - B3 explicitly offers no self-serve access for individuals.
Real signal across most facets with visible, nameable gaps — the contract exists but is thin, or the portal is good while governance and commercial terms are absent.
API Evangelist profiles B3 (Brasil Bolsa Balcão) the way a machine reads it — 15 machine-readable artifacts across 10 APIs, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — B3 (Brasil Bolsa Balcão) scores 49.7/100 (developing), with a separate agent-readiness read of 58/100 (agent ready). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance.
Kin Score
How this is scored →scored 2026-07-27 · rubric v0.5
How we profile B3 (Brasil Bolsa Balcão)
Each block below is one kind of artifact we hold for B3 (Brasil Bolsa Balcão). For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 10
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
B3 Investor Area (Área do Investidor) APIs
D-1 investor data for authorized fintechs and custodians - investment positions, account transactions, listed-asset buy/sell activity, public offering participation, and provisi...
B3 Tesouro Direto APIs
Treasury Direct platform APIs - the Bonds API serves reference data for Brazilian public bonds (name, maturity, Selic code, platform identifiers), Positions serves investor posi...
B3 OTC (Balcão) APIs
Registration, custody, and consultation APIs for the OTC segment - bank funding instruments (CDB, RDB, LCA, LCI, LF, LIG), credit notes (CCB, CPR, NC), OTC derivatives (swaps, f...
B3 Listed Markets (Listados) APIs
Post-trade APIs for the listed segment - iMercado investment fund registration and equities fee details, CORE risk calculation and simulation, unified client registration, asset...
B3 ISIN API
ISIN issuance and management for financial instruments - B3 is the Brazilian numbering agency - covering ISIN requests, updates, and consultation of instrument identifier records.
Banco B3 APIs
Banco B3 Custody API for operation billing, position reports, and fund quote validation, plus the Settlement API for Pix statement consultation.
B3 Insurance (Seguros) APIs
Insurance-segment registration APIs (V3) covering accepted co-insurance registration, claim registration, document registration, and batch processing return with data-quality fe...
B3 Authentication APIs
OAuth 2.0 token issuance APIs used across the B3 API catalog - Client Credentials flows (plain, plus category_ID, key, or scope parameter variants) and Resource Owner Password C...
B3 Market Data Feed (UMDF)
B3's real-time market data distribution over the Unified Market Data Feed (UMDF) - event-based bid, ask, trade, and statistics data in L1 (top of book) or L2 (full book) depth, ...
B3 UP2DATA
End-of-day and reference data service covering fixed income, equities, currencies, and debentures for mark-to-market, risk, and pricing workflows - standardized files in TXT, CS...
Scroll within the panel for all 10 ·
MCP Servers 1
Model Context Protocol servers expose these APIs directly to AI agents. We profile them because agent-native access is the fastest-growing way this provider's capabilities actually get used.
Model Context Protocol servers that expose these APIs to AI agents.
b3-exchange-mcp.yml
MCP SERVERSecurity Posture 3
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Scopes 1
OAuth scopes are the vocabulary of least-privilege access. Profiling them shows exactly what an integration — or an agent acting on a user's behalf — is allowed to do.
OAuth scopes governing access to this provider's APIs.
Resources
Every other property we hold for B3 (Brasil Bolsa Balcão) — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 4
Portal, sign-up, and the first successful call
Documentation 2
Reference material describing how the API behaves
Agent Surfaces 4
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 5
Pagination, idempotency, versioning, errors, and events
Build 1
SDKs, sample code, and the tooling you integrate with
Access & Security 6
Authentication, authorization, and security posture
Operate 2
Status, limits, changes, and where to get help
Commercial 2
Pricing, plans, and the legal terms of use
Company 2
The organization behind the API
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