# B3 (Brasil Bolsa Balcão)

**Canonical:** https://apis.io/providers/b3-exchange/  
**Website:** https://www.b3.com.br/en_us/  
**APIs profiled:** 10

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.

## Kin Score — 44.6 / 100 (developing)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 44.6).

| Facet | Score |
|---|---|
| Discoverability | 72.2 |
| Contract Quality | 28.2 |
| Governance | 30.3 |
| Contract Governance | 30.3 |
| Operational Transparency | 26.3 |
| Developer Ergonomics | 63.7 |
| Commercial Clarity | 27.6 |
| Access Clarity | 27.6 |

Regulatory layer — **Securities & Market Data**: 68.3 (matched via tags).

## Agent readiness — 31.0 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | documented |
| OpenAPI Examples | no |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | derived |
| Well Known Catalog | no |
| Consent Identity | yes |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Unknown — onboarding: unknown, pricing: unknown, trial: no (confidence: low).

## APIs (10)

- **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...

## MCP servers (1)

- **B3 (Brasil Bolsa Balcão) MCP Server**

## Security (3)

- **B3 Exchange Authentication** — oauth2 · 3 schemes
- **B3 Exchange Domain Security** — TLSv1.3 · HSTS · DNSSEC · DMARC
- **B3 Exchange Vulnerability Disclosure** — security.txt · contact published

## Tags

Financial, Market Data, Stocks, Trading, Exchange, Derivatives, Fixed Income, Real-Time, Reference Data, Brazil

---

Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/b3-exchange/). Scores are computed from the provider's own public artifacts under a published rubric.