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Coinbase Prime — Institutional On-Ramp

Coinbase Prime is Coinbase’s institutional prime brokerage — it handles fiat-to-crypto conversion, custody, and direct Base mainnet access for institutional clients. For corporate treasuries and financial institutions that need a regulated on-ramp to USDC before settling through DPX, Prime is the institutional-grade path.

Coinbase Prime + DPX: Prime converts your fiat to USDC, DPX handles the cross-border settlement. Both are compliant, both are Base-native.

Why Coinbase Prime for DPX

Section titled “Why Coinbase Prime for DPX”
CapabilityRelevance to DPX
Fiat→USDC conversionFund your settlement wallet from USD/EUR bank accounts
Direct Base mainnet accessUSDC lands directly in your Base wallet, ready for DPX
SOC 2 Type II / SOC 1Audit-ready custody for regulated institutions
Sub-account structureSeparate settlement wallets per entity or corridor
Prime APIAutomate funding, sweeps, and position management
Coinbase CommerceAccept stablecoin payments from counterparties

Architecture

Section titled “Architecture”
Corporate bank account (USD / EUR)
    │
    │  Wire / ACH / SEPA
    ▼
Coinbase Prime
    │  Fiat → USDC / EURC conversion
    │  Held in Prime custody
    ▼
Prime API → withdraw to Base wallet
    │
    ▼
Your settlement wallet on Base mainnet
    │
    │  DPX Integration API or MCP
    ▼
DPX Settlement Rail
    │  Compliance → Oracle → On-chain
    ▼
Recipient wallet (~30 seconds)

Setting up Coinbase Prime

Section titled “Setting up Coinbase Prime”
  1. Apply at prime.coinbase.com — institutional onboarding, KYB required
  2. Fund your Prime account via wire transfer or ACH (USD) or SEPA (EUR via EURC)
  3. Convert to USDC or EURC — instant within Prime at market rate
  4. Withdraw to Base — Prime supports direct Base mainnet withdrawals; specify your DPX settlement wallet address
  5. Execute settlements via DPX Integration API or MCP

Prime API — automated funding

Section titled “Prime API — automated funding”

For high-frequency or automated settlement flows, use the Prime API to fund your settlement wallet programmatically:

// Withdraw USDC from Prime to your Base settlement wallet
const response = await fetch('https://api.prime.coinbase.com/v1/portfolios/{portfolio_id}/withdraw', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'X-CB-ACCESS-KEY': process.env.PRIME_API_KEY,
    // + PRIME_API_SECRET, PRIME_API_PASSPHRASE signing
  },
  body: JSON.stringify({
    amount:       '1000000.00',
    currency:     'USDC',
    payment_method: {
      type:    'blockchain',
      address: '0xYOUR_DPX_SETTLEMENT_WALLET',
      network: 'base'
    }
  })
});


// Then immediately initiate DPX settlement
const settlement = await fetch('https://integration.untitledfinancial.com/payments/initiate', {
  method: 'POST',
  headers: {
    'Authorization': `Bearer ${process.env.DPX_API_KEY}`,
    'Content-Type':  'application/json'
  },
  body: JSON.stringify({
    amount:          '1000000.00',
    currency:        'USD',
    settlementAsset: 'USDC',
    creditor: {
      lei:           '5493001KJTIIGC8Y1R12',
      walletAddress: '0xRECIPIENT_WALLET'
    }
  })
});

EURC via Coinbase

Section titled “EURC via Coinbase”

For EUR-denominated flows, Coinbase Prime supports EURC on Base. The workflow is identical but uses EURC, eliminating FX exposure on the DPX settlement leg:

  • DPX all-in rate for EURC (EUR-to-EUR): ~1.635% (no FX fee)
  • Versus USDC cross-currency: ~2.035%
  • Versus Fipto / correspondent banking: 2–5%

Custody and compliance

Section titled “Custody and compliance”

Coinbase Prime provides:

  • SOC 2 Type II audited custody
  • FinCEN-registered Money Services Business
  • NYDFS BitLicense holder
  • MiFID II compliant for EU institutional clients
  • Segregated client assets — your USDC is not commingled with Coinbase’s own funds

Combined with DPX’s on-chain compliance stack (VoP, AML oracle, FATF R16), the full flow from fiat to settled cross-border payment is audit-ready at every layer.

Auto-sweep: USDC fee collector

Section titled “Auto-sweep: USDC fee collector”

DPX collects settlement fees in USDC at 0x160e920012fb4BAe2E465c1eD8815c5FD51B5Ce0. If you are running high-volume settlements, configure a Coinbase Prime sweep to automatically repatriate accumulated USDC back to fiat:

// Cron: sweep fee collector balance back to Prime daily
// Prime API: deposit from Base wallet

Further reading

Section titled “Further reading”