MCP server liveNo signup to testOpen brokerage APIs.No platform fees.
Built for fintechs, wealth platforms, and AI agents.
US & non-US accountsEquities, options, cryptoWallet routingMCP for agentsPublic sandboxUS & non-US accountsEquities, options, cryptoWallet routingMCP for agentsPublic sandboxThree audiences. One regulated stack.
Build across brokerage, options, crypto, and wallet APIs with one auth layer, one SDK, and one audit trail.
Trusted Infrastructure for Fintechs and broker‑dealers building the next generation of investing experiences.
FINRA-registered BD
SEC-registered RIA
Clearing & Custody
KYC/CIP/AML
What slows fintechs down — and what we do instead
The friction points that show up when fintechs evaluate brokerage infrastructure. Each row is observable in the category; the right column is what BuildMarkets ships today.
Platform fee
$0
Platform fee
Tiered platform fees, often $1k+/month for higher tiers or asset classes
Onboarding deposit
$0
Deposit
Good-faith deposits or signed agreements before sandbox access
Sandbox access
Public demo, no signup
Signup form, sales call, or signed agreement typical
Non-US customer onboarding
First-class W-8BEN, foreign tax ID, passport-based KYC
High manual — review rates, country gating, US-centric KYC vendors
Pricing visibility
Fully published
Tier-based or sales-led; full schedule behind a contract
Agentic execution
Scoped, revocable mandate with its own agent identity and immutable audit
Borrowed API key plus disclaimer; no per-agent identity or scoped delegation
Developer experience for AI
API + MCP server + Skills bundle for coding agents
API docs and Postman coding — agent integration is on the developer
Four APIs. One auth. One stack.
Equities and ETFs
Brokerage
Account opening, funding, balances, positions, statements.
POST /v1/accounts
Same auth as Brokerage
Options
Approval workflows, eligibility, disclosures, order entry, risk controls.
POST /v1/options/orders
Bakkt custody · shared KYC
Crypto access
Transactions, custody, liquidity, reporting, compliance workflows.
POST /v1/crypto/orders
Multi-asset routing
Wallet investing
Wallet-to-brokerage, wallet-to-crypto, scheduled recurring investments.
POST /v1/wallet/route
One token, not four integrations
Same auth. Same SDK. Same audit trail.
One Bearer token covers all four APIs. One webhook contract. One compliance record.
Read the docsAI-native, both ways
One MCP server. Two surfaces. Build-time integration in your IDE, runtime execution under a trader-granted mandate.
Scaffolds your integration
Executes trader's instructions
Scaffolds your integration
Executes trader's instructions
Trader-Granted Mandate
Accounts
Actions
Limits
Revocable
Immutable audit trailA grant of execution, not discretion.
Agents act only within a trader-granted mandate that can be revoked at any time.
Trader-granted mandate
The trader sets accounts, actions, and limits. Each agent has its own identity and cannot act outside the mandate.
Stays self-directed
The trader makes the investment decision before activating the agent. Standard KYC/CIP, suitability, and Reg BI obligations still apply.
Evidenced & auditable
Every action ties back to the trader's mandate and instruction, with a preserved record for supervision and examination.
Hard bounds & kill switch
Notional limits, velocity caps, and instant revocation keep the trader in control.
The full AI-native developer surface
Three surfaces, one regulated stack. Each surface serves a distinct moment in the developer journey — and together, they cover every way an engineer or AI agent will touch Buildmarkets.
MCP server
Runtime · For AI Agents
One MCP server reachable by Claude, Cursor, Codex, and any MCP client. The build-time and runtime surface from the section above, in one endpoint.
How the MCP works
bm CLI
Operations · For Developers and CI
Traditional terminal CLI in the AWS / Stripe / gh mold. Full API surface plus the wedge commands — webhooks tail, dev sandbox reset, logs tail, migrate from alpaca.
CLI Documentation
Skills bundle
Build-time · For Coding Agents
Open-standard SKILL.md bundle for Claude Code, Cursor, Codex CLI, and Gemini CLI. Loads when developers ask their coding agent to scaffold a Buildmarkets integration.
Skills DocumentationUnder 10 minutes. No sales call.
The whole onboarding flow is on the page itself.
1. Get a sandbox key
Email only. Key emailed instantly. No company profile, no credit card, no sales call.
2. Open an account
One POST opens a sandbox brokerage account. CIP runs async with webhook completion.
3. Place an order
Market buy for a fractional share in the same auth context. Four lines of curl.
$0 platform. Pass-through costs only.
BuildMarkets has no platform fee, no minimum, no contract gate. You pay only the third-party costs that exist whether you use us or not — execution, regulatory, custody — and we publish them all.
Pass-through costs
Not BuildMarkets charges
$0
Platform fee
SEC schedule
SEC Section 31 fee
$0
Sandbox access
FINRA schedule
FINRA TAF
$0
Account opening
OCC schedule
OCC clearing fees (optional)
$0
Per-account monthly fee
As consumed
SIP/market data subscriptions
$0
API call charges
At cost
Crypto network fees
ACH/wire/IRA custody
Bank schedules
We make our margin on a defined revenue share with TAPP Engine Securities, LLC.
All third-party schedules are published or referenced in your dashboard.
Capabilities by API
Same auth, same SDK, same audit trail across all four. Pick the surface you need; the rest is one call away.
Brokerage
Equities & ETFs
Account opening
Individual, joint, IRA, custodial. Async CIP. Non-US accounts native.
Funding
ACH, wire, journal. Same-day where eligible.
Orders
Market, limit, stop, Day & GTC. Fractional by notional or quantity.
Positions & statements
Real-time P&L, lot-level cost basis. 1099s automated.
Options
Listed options
Approval workflow
Tier 1-4 with OCC delivery and BD review queue.
Eligibility & buying power
Real-time margin requirement before order entry.
Multi-leg orders
Spreads, straddles, condors, calendars. Atomic execution.
Positions & risk
Greeks, mark-to-market, assignment monitoring, expiration handling.
Crypto
Bakkt-backed custody
Order types
Market and limit. Best-execution routing through Bakkt liquidity.
Qualified custody
Segregated, insured, audited. No on-chain key management for you.
Transfers
External withdrawals where supported. AML screening per BSA.
Reporting & tax
Lot-level cost basis, 1099-B / 1099-DA where required.
Wallet
Multi-asset routing
Routing rules
Per-user profiles. Split inbound dollars across brokerage, options, crypto.
Recurring
Scheduled investments across asset classes. Pause, resume, modify in-flight.
Idempotency & reconciliation
Partner-supplied keys, full reconciliation reports for finance teams.
Place an order
in 4 lines
A market buy for a fractional share, in the same auth
context as account creation.
Compliance & regulatory posture
Build Markets, LLC is the developer infrastructure subsidiary of TAPP Engine, Inc. Brokerage is provided by TAPP Engine Securities, LLC, member SIPC; advisory by TE Advisors, LLC. SEC-registered RIA.
FINRA / SIPC
TAPP Engine Securities, LLC is a member of FINRA and SIPC.
SEC registration
TE Advisors, LLC is an SEC-registered investment adviser.
Data & privacy
SOC 2 Type II certified. GLBA-compliant data handling.
Build on a regulated stack
in minutes
Sandbox is public. Pricing is published.
No sales call required.