Tokenly

The problem

Approach

The solution

Usage you can link to

// Only real YYYY-MM-DD dates survive a hand-edited link.
const dateField = (search: Record<string, unknown>, key: string) => {
  const value = field(search, key);
  return value && /^\d{4}-\d{2}-\d{2}$/.test(value) && !Number.isNaN(Date.parse(value))
    ? value
    : undefined;
};

export const Route = createFileRoute("/usage")({
  validateSearch: (search) => {
    let from = dateField(search, "from"),
      to = dateField(search, "to");
    if (from && to && from > to) [from, to] = [to, from]; // forgive swapped ranges
    return {
      model: field(search, "model"),
      project: field(search, "project"),
      key: field(search, "key"),
      token: tokenField(search), // "input" | "output" | undefined
      from,
      to,
    };
  },
  component: UsageView,
});

Budgets that forecast instead of report

/** Projected date the limit is reached at the current 7-day burn rate. */
export function projectHit(b: BudgetRule) {
  const spent = budgetSpend(b),
    burn = dailyBurn(b.scope, b.targetId);
  if (spent >= b.amount) return { reached: true, date: LAST_DAY };
  if (burn <= 0) return null;

  const days = Math.ceil((b.amount - spent) / burn);
  const date = shift(LAST_DAY, days);
  return {
    reached: false,
    date,
    // Weekly and daily windows roll, so compare against the window's own end.
    withinPeriod: date <= (b.period === "monthly"
      ? periodEnd("monthly")
      : shift(LAST_DAY, b.period === "weekly" ? 6 : 0)),
  };
}

Payments: credits, bonuses and auto-recharge

export const BONUS_TIERS = [
  { min: 1000, pct: 15 },
  { min: 500, pct: 10 },
  { min: 200, pct: 5 },
];
export const bonusPct = (usd: number) => BONUS_TIERS.find((t) => usd >= t.min)?.pct ?? 0;
export const creditsFor = (usd: number) => Math.round(usd / USD_PER_CREDIT);

topUp(usd: number, methodLabel: string) {
  const base = creditsFor(usd),
    bonus = Math.round((base * bonusPct(usd)) / 100);
  const entries: LedgerEntry[] = [
    { id: `tu_${stamp}`, type: "top-up", description: `Top-up · ${methodLabel}`, amount: base },
  ];
  if (bonus) entries.push({ id: `bn_${stamp}`, type: "bonus", amount: bonus,
    description: `${bonusPct(usd)}% top-up bonus` });
  set({ ...state, balance: state.balance + base + bonus,
        extraLedger: [...state.extraLedger, ...entries] });
},

setAutoRecharge(patch: Partial<AutoRecharge>) {
  // Never charge without a card on file.
  if (patch.enabled && state.methods.length === 0) return;
  set({ ...state, autoRecharge: { ...state.autoRecharge, ...patch } });
},
removeMethod(id: string) {
  const rest = state.methods.filter((m) => m.id !== id);
  // Promote a new default card, and switch auto-recharge off when the last card goes.
  if (rest.length && !rest.some((m) => m.isDefault)) rest[0] = { ...rest[0], isDefault: true };
  const autoRecharge = rest.length ? state.autoRecharge : { ...state.autoRecharge, enabled: false };
  set({ ...state, methods: rest, autoRecharge });
},

Invoices that download on any device

useEffect(() => {
  import("./invoice-pdf").then(async ({ createInvoicePdf }) => {
    const results = await Promise.all(invoices.map(async (invoice) => [invoice.id,
      await createInvoicePdf({ ...invoice, workspace: general.name,
                               status: invoiceStatus[invoice.id] ?? "paid" })]));
    if (active) setPdfs(Object.fromEntries(results));
  }).catch(() => { if (active) setPdfError(true); });
}, [invoiceStatus, general.name, pdfAttempt]);

export async function downloadInvoice(blob: Blob, filename: string) {
  const file = new File([blob], filename, { type: "application/pdf" });
  // Phones: use the share sheet. Desktop: a normal download.
  if (matchMedia("(pointer: coarse)").matches && navigator.canShare?.({ files: [file] })) {
    try { await navigator.share({ files: [file], title: filename }); return; }
    catch (error) { if (error instanceof DOMException && error.name === "AbortError") return; }
  }
  const url = URL.createObjectURL(blob);
  /* …anchor click, then revoke after 30s */
}

One permission model for four roles

export const ROLE_PERMS: Record<Role, Permission[]> = {
  Owner: PERMISSIONS.map((p) => p.id),
  Admin: ["viewUsage", "manageKeys", "manageProjects", "manageLimits",
          "viewBilling", "manageBilling", "manageTeam"],
  Developer: ["viewUsage", "manageKeys", "manageProjects"],
  "Finance viewer": ["viewUsage", "viewBilling"],
};

// <Gate> only disables buttons. guarded() re-checks the role inside each
// store action, so a missed button or a console call can't change data.
export function guarded<T extends ActionMap>(actions: T, perms: PermMap<T>) {
  return Object.fromEntries(Object.entries(actions).map(([name, fn]) => [name,
    (...args: unknown[]) => {
      const perm = perms[name], role = roleOf(state);
      if (perm && !ROLE_PERMS[role].includes(perm)) {
        toast.error(deniedReason(role));
        return undefined;
      }
      return fn(...args);
    }]));
}

export const billingActions = guarded({ topUp, setAutoRecharge, /* … */ },
  { topUp: "manageBilling", setAutoRecharge: "manageBilling" });

Built to survive real use

Outcome

What’s next