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feat: add downside rate calculator #321

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36 changes: 36 additions & 0 deletions frontend/src/blend.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -693,6 +693,42 @@ export function projectRates(rs: ReserveStats, addSupply: number, addBorrow: num

// ── User position ─────────────────────────────────────────────────────────────

export interface DownsideScenario {
utilization: number; // 0..1
rates: ProjectedRates;
netApy: number; // leveraged APY, %
hfDecayApr: number; // interest-only HF decay, %/yr
daysToLiquidation: number | null; // null when already liquidatable / invalid
}

/**
* Stress a reserve at a future utilization while reusing the same projectRates
* path as the trade preview. The pool supply is held constant and borrow is
* moved to the requested utilization, matching "util hits X%" scenarios.
*/
export function projectDownsideScenario(
rs: ReserveStats,
targetUtilization: number,
leverage: number,
healthFactor: number,
): DownsideScenario {
const utilization = Math.min(0.9999, Math.max(0, targetUtilization));
const targetBorrow = rs.totalSupply * utilization;
const rates = projectRates(rs, 0, targetBorrow - rs.totalBorrow);
const netApr = rates.netSupplyApr * leverage - rates.netBorrowCost * (leverage - 1);
const netApy = (Math.exp(netApr / 100) - 1) * 100;
const hfDecayApr = rates.interestBorrowApr - rates.interestSupplyApr;

let daysToLiquidation: number | null = null;
if (hfDecayApr <= 0) {
daysToLiquidation = Number.POSITIVE_INFINITY;
} else if (Number.isFinite(healthFactor) && healthFactor > 1) {
daysToLiquidation = Math.log(healthFactor) / (hfDecayApr / 100) * 365;
}

return { utilization, rates, netApy, hfDecayApr, daysToLiquidation };
}

export interface AssetPosition {
asset: AssetInfo;
bTokens: bigint;
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61 changes: 60 additions & 1 deletion frontend/src/views/trade.css
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Original file line number Diff line number Diff line change
Expand Up @@ -324,10 +324,67 @@
/* ── Position card ────────────────────────────────────────────────────────── */
.trade-heroes {
display: grid;
grid-template-columns: repeat(3, 1fr);
grid-template-columns: minmax(0, 0.85fr) minmax(0, 0.85fr) minmax(280px, 1.3fr);
gap: var(--tl-space-3);
margin-bottom: var(--tl-space-4);
}
.trade-apy-stack {
display: flex;
flex-direction: column;
gap: var(--tl-space-2);
min-width: 0;
}
.trade-downside {
background: var(--tl-input-bg);
border: 1px solid var(--tl-border);
border-radius: var(--tl-radius);
padding: 10px 12px;
}
.trade-downside__head {
display: grid;
grid-template-columns: minmax(0, 1fr) 118px;
align-items: center;
gap: var(--tl-space-2);
margin-bottom: var(--tl-space-2);
}
.trade-downside__title {
display: inline-flex;
align-items: center;
gap: var(--tl-space-1);
min-width: 0;
font-size: var(--tl-text-xs);
font-weight: 700;
color: var(--tl-text-2);
}
.trade-downside .tl-input__field {
min-height: 32px;
padding-top: 6px;
padding-bottom: 6px;
font-size: var(--tl-text-xs);
}
.trade-downside__table {
width: 100%;
border-collapse: collapse;
table-layout: fixed;
font-size: 11px;
}
.trade-downside__table th,
.trade-downside__table td {
padding: 5px 4px;
border-top: 1px solid var(--tl-border);
text-align: right;
white-space: nowrap;
}
.trade-downside__table th {
color: var(--tl-text-3);
font-weight: 700;
}
.trade-downside__table th:first-child,
.trade-downside__table td:first-child {
width: 18%;
text-align: left;
color: var(--tl-text-2);
}
.trade-position .trade-hf-well {
background: var(--tl-input-bg);
border: 1px solid var(--tl-border);
Expand Down Expand Up @@ -459,6 +516,8 @@
@media (max-width: 720px) {
.trade-stats { grid-template-columns: repeat(2, 1fr); }
.trade-rates { grid-template-columns: 1fr; }
.trade-heroes { grid-template-columns: 1fr; }
.trade-downside__head { grid-template-columns: 1fr; }
.trade-cols { grid-template-columns: 1fr; }
.trade-pool-menu { left: 0; }
}
100 changes: 94 additions & 6 deletions frontend/src/views/trade.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -37,6 +37,7 @@ import {
fetchPositionEvents,
aggregatePoolAccount,
projectRates,
projectDownsideScenario,
hfForLeverage,
maxLeverageFor,
buildApproveXdr,
Expand Down Expand Up @@ -1017,6 +1018,7 @@ export function tradeScreen(): HTMLElement {
const netApy = agg.netApy;
const effLev = agg.effLeverage;
const cFactor = rs ? rs.cFactor : ts.asset.cFactor;
const downside = rs ? downsideCalculator(rs, accountHF, effLev) : null;

// 3 hero metrics.
const heroes = el("div", { class: "trade-heroes" }, [
Expand All @@ -1026,12 +1028,15 @@ export function tradeScreen(): HTMLElement {
value: `${effLev.toFixed(1)}×`,
tone: effLev > 7 ? "danger" : effLev > 4 ? "warning" : "default",
}),
MetricHero({
label: "Net APY",
value: `${netApy >= 0 ? "+" : ""}${fmt(netApy, 1)}%`,
tone: netApy >= 0 ? "success" : "danger",
sub: "projected",
}),
el("div", { class: "trade-apy-stack" }, [
MetricHero({
label: "Net APY",
value: `${netApy >= 0 ? "+" : ""}${fmt(netApy, 1)}%`,
tone: netApy >= 0 ? "success" : "danger",
sub: "projected",
}),
downside,
].filter(Boolean) as HTMLElement[]),
]);

// Account Health.
Expand Down Expand Up @@ -1141,6 +1146,89 @@ export function tradeScreen(): HTMLElement {
return el("div", {}, [heroes, hfWell, detailRows, timeline, blndRow, actions]);
}

function downsideCalculator(rs: ReserveStats, healthFactor: number, leverage: number): HTMLElement {
const currentUtilPct = rs.totalSupply > 0 ? (rs.totalBorrow / rs.totalSupply) * 100 : 0;
let targetPct = Math.min(99.99, Math.max(currentUtilPct + 1, 97));

const tableBody = el("tbody");
const input = Input({
value: targetPct.toFixed(1),
inputMode: "decimal",
suffix: "%",
title: "Future pool utilization",
onChange: (value) => {
const next = Number.parseFloat(value.replace(/[^\d.]/g, ""));
if (Number.isFinite(next)) targetPct = Math.min(99.99, Math.max(0, next));
renderRows();
},
});

const daysText = (days: number | null) =>
days === null
? "N/A"
: !Number.isFinite(days)
? "Never"
: days > 3650
? ">10y"
: `${Math.max(0, Math.round(days))}d`;

const decayText = (decay: number) =>
decay <= 0 ? "No decay" : `${fmt(decay, 2)}%/yr`;

const row = (label: string, pct: number): HTMLElement => {
const s = projectDownsideScenario(rs, pct / 100, leverage, healthFactor);
return el("tr", {}, [
el("td", {}, [label]),
el("td", { class: "trade-mono" }, [`${fmt(s.utilization * 100, 1)}%`]),
el(
"td",
{ class: `trade-mono ${s.netApy >= 0 ? "trade-tone-up" : "trade-tone-down"}` },
[`${s.netApy >= 0 ? "+" : ""}${fmt(s.netApy, 1)}%`],
),
el("td", { class: `trade-mono ${s.hfDecayApr > 0 ? "trade-tone-warn" : "trade-tone-up"}` }, [
decayText(s.hfDecayApr),
]),
el("td", { class: "trade-mono" }, [daysText(s.daysToLiquidation)]),
]);
};

function renderRows(): void {
const severe = Math.min(99.99, Math.max(targetPct + 1, 99));
tableBody.replaceChildren(
row("Now", currentUtilPct),
row("Input", targetPct),
row("Stress", severe),
);
}

renderRows();

return el("div", { class: "trade-downside" }, [
el("div", { class: "trade-downside__head" }, [
el("span", { class: "trade-downside__title" }, [
"What if rates move against you?",
Tooltip({
text:
"Uses the live Blend rate projection with a future utilization scenario, then estimates HF decay and liquidation time at current leverage.",
}),
]),
input,
]),
el("table", { class: "trade-downside__table" }, [
el("thead", {}, [
el("tr", {}, [
el("th", {}, ["Case"]),
el("th", {}, ["Util"]),
el("th", {}, ["Net APY"]),
el("th", {}, ["HF decay"]),
el("th", {}, ["Liq"]),
]),
]),
tableBody,
]),
]);
}

// ── Close confirmation (inline, replaces position body) ───────────────────
function askClose(pos: AssetPosition): void {
const sym = ts.asset.symbol;
Expand Down