Over-the-Counter (OTC) DvP Builder

HoldingAccount.build_otc_dvp(...) builds an atomic delivery-vs-payment group for OTC secondary trades.

The builder is intentionally non-custodial:

• it creates the payment leg
• it creates the D-ASA transfer leg
• it returns the composed group for inspection, signing, simulation, or sending

Algo Settlement

draft = app.account(seller).build_otc_dvp(
    buyer=buyer,
    units=10,
    payment_amount=150_000,
)

result = draft.send()

ASA Settlement

draft = app.account(seller).build_otc_dvp(
    buyer=buyer,
    units=10,
    payment_amount=15_000,
    payment_asset_id=settlement_asa_id,
)

Guardrails

The builder validates:

• units > 0
• payment_amount > 0
• seller and buyer are different
• the seller signer matches the transfer sender holding address
• optional quote tolerance, when provided

You can combine it with quote_trade(...) inputs to fail fast when the negotiated payment amount drifts too far from the SDK’s accrual-aware reference.