Storage Costs

Understanding storage costs helps you budget effectively and avoid service interruptions. This guide covers the SDK APIs for calculating costs, funding your account, and querying account state.

Storage operates on a pay-per-epoch model where you deposit USDFC tokens and set allowances that control how much the storage service can spend.

Pricing Components

Component	Cost	Notes
Storage	$2.50/TiB/month	Minimum $0.06/month per data set (~24.567 GiB threshold)
Sybil Fee	0.1 USDFC (one-time)	Per new data set creation; prevents state-growth spam
CDN Egress	$14/TiB downloaded	1 USDFC top-up ≈ 71.5 GiB of downloads
CDN Setup	1 USDFC (one-time)	Per data set; reusing existing data sets incurs no cost

Pricing Logic:

Storage < 24.567 GiB: Minimum $0.06/month applies
Storage ≥ 24.567 GiB: Actual cost (bytes / TiB) × $2.50/month
CDN data sets require 1 USDFC setup on first creation only
CDN egress credits can be topped up anytime

Real-World Cost Examples

These examples use plain arithmetic for clarity. For programmatic cost calculation, use getUploadCosts() — see Querying Upload Costs below.

Example 1: NFT Collection (10,000 × 5 KiB ≈ 48.82 MiB)

// 48.82 MiB less than 24.567 GiB threshold
// Price is $0.06/month
const 
const PRICE_PER_MONTH: 0.06
PRICE_PER_MONTH = 0.06;
const 
const months: 24
months = 24;
const 
const PRICE_FOR_24_MONTHS: number
PRICE_FOR_24_MONTHS = 
const PRICE_PER_MONTH: 0.06
PRICE_PER_MONTH * 24; // 1.44 USDFC

Duration	Total Cost
1 month	0.06 USDFC
24 months	1.44 USDFC

Example 2: User Content Platform with CDN

Storage: 1,000 users × 100 MiB ≈ 100,000 MiB
Traffic: 1,000 users × 100 MiB/month ≈ 100,000 MiB/month egress

const 
const STORAGE_PRICE_PER_TIB_PER_MONTH: 2.5
STORAGE_PRICE_PER_TIB_PER_MONTH = 2.5; // $2.50/TiB/month
const 
const CDN_EGRESS_PRICE_PER_TIB: 14
CDN_EGRESS_PRICE_PER_TIB = 14; // $14/TiB downloaded
const 
const storageMiB: 100000
storageMiB = 100_000;
const 
const egressMiB: 100000
egressMiB = 100_000;

// Storage: 100,000 MiB ≈ 0.0953 TiB
const 
const storageTiB: number
storageTiB = 
const storageMiB: 100000
storageMiB / 1024 / 1024;

// Egress: 100,000 MiB ≈ 0.0953 TiB
const 
const egressTiB: number
egressTiB = 
const egressMiB: 100000
egressMiB / 1024 / 1024;

// Storage cost per month: 0.0953 TiB × $2.50 ≈ $0.238/month
const 
const storageCostPerMonth: number
storageCostPerMonth = 
const storageTiB: number
storageTiB * 
const STORAGE_PRICE_PER_TIB_PER_MONTH: 2.5
STORAGE_PRICE_PER_TIB_PER_MONTH;

// Egress cost per month: 0.0953 TiB × $14 ≈ $1.334/month
const 
const egressCostPerMonth: number
egressCostPerMonth = 
const egressTiB: number
egressTiB * 
const CDN_EGRESS_PRICE_PER_TIB: 14
CDN_EGRESS_PRICE_PER_TIB;

// Total cost per month: $0.238/month + $1.334/month ≈ $1.572/month
const 
const totalCostPerMonth: number
totalCostPerMonth = 
const storageCostPerMonth: number
storageCostPerMonth + 
const egressCostPerMonth: number
egressCostPerMonth;

// Total cost for 24 months: $1.572/month × 24 ≈ $37.728
const 
const totalCostFor24Months: number
totalCostFor24Months = 
const totalCostPerMonth: number
totalCostPerMonth * 24;

Cost Component	Per Month	24 Months
Storage	≈ 0.238 USDFC	≈ 5.71 USDFC
CDN Egress	≈ 1.334 USDFC	≈ 32.016 USDFC
Total	≈ 1.572 USDFC	≈ 37.728 USDFC

Querying Upload Costs

Use getUploadCosts() to preview costs without executing any transaction. This is useful for displaying pricing in a UI or letting users confirm before proceeding.

Getting the costs for uploading to an existing dataset:

// With currentDataSetSize — accurate floor-aware delta
const { 
const rate: {
    perEpoch: bigint;
    perMonth: bigint;
}
rate, 
const depositNeeded: bigint
depositNeeded } = await 
const synapse: Synapse
synapse.
Synapse.storage: StorageManager
storage.
StorageManager.getUploadCosts(options: Omit<GetUploadCostsOptions, "clientAddress">): Promise<UploadCosts>
getUploadCosts({
  
isNewDataSet?: boolean | undefined
isNewDataSet: false,
  
currentDataSetSize?: bigint | undefined
currentDataSetSize: 50n * 
const SIZE_CONSTANTS: {
    readonly KiB: 1024n;
    readonly MiB: bigint;
    readonly GiB: bigint;
    readonly TiB: bigint;
    readonly PiB: bigint;
    readonly MAX_UPLOAD_SIZE: 1065353216;
    readonly MIN_UPLOAD_SIZE: 127;
    readonly DEFAULT_UPLOAD_BATCH_SIZE: 32;
    readonly BYTES_PER_LEAF: 32n;
}
SIZE_CONSTANTS.
type MiB: bigint
MiB,
  
dataSize: bigint
dataSize: 100n * 
const SIZE_CONSTANTS: {
    readonly KiB: 1024n;
    readonly MiB: bigint;
    readonly GiB: bigint;
    readonly TiB: bigint;
    readonly PiB: bigint;
    readonly MAX_UPLOAD_SIZE: 1065353216;
    readonly MIN_UPLOAD_SIZE: 127;
    readonly DEFAULT_UPLOAD_BATCH_SIZE: 32;
    readonly BYTES_PER_LEAF: 32n;
}
SIZE_CONSTANTS.
type MiB: bigint
MiB,
})
// Shows incremental cost (newRate - currentRate), handles floor-to-floor

// Without currentDataSetSize — safe overestimate for floor cases
const 
const costs2: getUploadCosts.OutputType
costs2 = await 
const synapse: Synapse
synapse.
Synapse.storage: StorageManager
storage.
StorageManager.getUploadCosts(options: Omit<GetUploadCostsOptions, "clientAddress">): Promise<UploadCosts>
getUploadCosts({
  
isNewDataSet?: boolean | undefined
isNewDataSet: false,
  
dataSize: bigint
dataSize: 100n * 
const SIZE_CONSTANTS: {
    readonly KiB: 1024n;
    readonly MiB: bigint;
    readonly GiB: bigint;
    readonly TiB: bigint;
    readonly PiB: bigint;
    readonly MAX_UPLOAD_SIZE: 1065353216;
    readonly MIN_UPLOAD_SIZE: 127;
    readonly DEFAULT_UPLOAD_BATCH_SIZE: 32;
    readonly BYTES_PER_LEAF: 32n;
}
SIZE_CONSTANTS.
type MiB: bigint
MiB,
})
// Accurate for above-floor datasets, overestimates for floor-priced ones

Getting the costs for uploading to a new dataset:

const { 
const rate: {
    perEpoch: bigint;
    perMonth: bigint;
}
rate, 
const depositNeeded: bigint
depositNeeded, 
const needsFwssMaxApproval: boolean
needsFwssMaxApproval, 
const ready: boolean
ready } = await 
const synapse: Synapse
synapse.
Synapse.storage: StorageManager
storage.
StorageManager.getUploadCosts(options: Omit<GetUploadCostsOptions, "clientAddress">): Promise<UploadCosts>
getUploadCosts({
  
dataSize: bigint
dataSize: 100n * 
const SIZE_CONSTANTS: {
    readonly KiB: 1024n;
    readonly MiB: bigint;
    readonly GiB: bigint;
    readonly TiB: bigint;
    readonly PiB: bigint;
    readonly MAX_UPLOAD_SIZE: 1065353216;
    readonly MIN_UPLOAD_SIZE: 127;
    readonly DEFAULT_UPLOAD_BATCH_SIZE: 32;
    readonly BYTES_PER_LEAF: 32n;
}
SIZE_CONSTANTS.
type MiB: bigint
MiB,
  
isNewDataSet?: boolean | undefined
isNewDataSet: true,
  
withCDN?: boolean | undefined
withCDN: true,
})

// Storage rate per epoch (30 seconds)
var console: Console
console.
Console.log(...data: any[]): void
The console.log() static method outputs a message to the console.
MDN Reference
log("Rate per epoch:", 
function formatUnits(value: bigint, options?: FormatUnitsOptions): string
formatUnits(
const rate: {
    perEpoch: bigint;
    perMonth: bigint;
}
rate.
perEpoch: bigint
perEpoch), "USDFC")
// Storage rate per month
var console: Console
console.
Console.log(...data: any[]): void
The console.log() static method outputs a message to the console.
MDN Reference
log("Rate per month:", 
function formatUnits(value: bigint, options?: FormatUnitsOptions): string
formatUnits(
const rate: {
    perEpoch: bigint;
    perMonth: bigint;
}
rate.
perMonth: bigint
perMonth), "USDFC")
// USDFC to deposit
var console: Console
console.
Console.log(...data: any[]): void
The console.log() static method outputs a message to the console.
MDN Reference
log("Deposit needed:", 
function formatUnits(value: bigint, options?: FormatUnitsOptions): string
formatUnits(
const depositNeeded: bigint
depositNeeded), "USDFC")
// Whether FWSS needs to be approved
var console: Console
console.
Console.log(...data: any[]): void
The console.log() static method outputs a message to the console.
MDN Reference
log("Needs approval:", 
const needsFwssMaxApproval: boolean
needsFwssMaxApproval)
// Whether the account is ready to upload
var console: Console
console.
Console.log(...data: any[]): void
The console.log() static method outputs a message to the console.
MDN Reference
log("Ready to upload:", 
const ready: boolean
ready)

Upload Preparation

Before uploading, the WarmStorage operator must be approved and your account must be funded. FWSS requires a 30-day prepayment buffer — when your balance drops below 30 days, the provider may remove your data.

prepare() computes costs and returns a ready-to-execute transaction. This is the recommended approach — it handles deposit calculation, operator approval, and contract call routing in one step.

const { 
const costs: getUploadCosts.OutputType
costs, 
const transaction: {
    depositAmount: bigint;
    includesApproval: boolean;
    execute: (options?: {
        onHash?: (hash: Hash) => void;
    }) => Promise<{
        hash: Hash;
        receipt: TransactionReceipt<bigint, number, "success" | "reverted", TransactionType> | null;
    }>;
} | null
transaction } = await 
const synapse: Synapse
synapse.
Synapse.storage: StorageManager
storage.
StorageManager.prepare(options: PrepareOptions): Promise<PrepareResult>
prepare({
  
PrepareOptions.dataSize: bigint
dataSize: 
const SIZE_CONSTANTS: {
    readonly KiB: 1024n;
    readonly MiB: bigint;
    readonly GiB: bigint;
    readonly TiB: bigint;
    readonly PiB: bigint;
    readonly MAX_UPLOAD_SIZE: 1065353216;
    readonly MIN_UPLOAD_SIZE: 127;
    readonly DEFAULT_UPLOAD_BATCH_SIZE: 32;
    readonly BYTES_PER_LEAF: 32n;
}
SIZE_CONSTANTS.
type GiB: bigint
GiB,
})

// Inspect costs
const { 
const rate: {
    perEpoch: bigint;
    perMonth: bigint;
}
rate, 
const depositNeeded: bigint
depositNeeded } = 
const costs: getUploadCosts.OutputType
costs // Upload costs breakdown
var console: Console
console.
Console.log(...data: any[]): void
The console.log() static method outputs a message to the console.
MDN Reference
log("Rate per month:", 
function formatUnits(value: bigint, options?: FormatUnitsOptions): string
formatUnits(
const rate: {
    perEpoch: bigint;
    perMonth: bigint;
}
rate.
perMonth: bigint
perMonth))
var console: Console
console.
Console.log(...data: any[]): void
The console.log() static method outputs a message to the console.
MDN Reference
log("Deposit needed:", 
function formatUnits(value: bigint, options?: FormatUnitsOptions): string
formatUnits(
const depositNeeded: bigint
depositNeeded))

// Execute if the account isn't ready
if (
const transaction: {
    depositAmount: bigint;
    includesApproval: boolean;
    execute: (options?: {
        onHash?: (hash: Hash) => void;
    }) => Promise<{
        hash: Hash;
        receipt: TransactionReceipt<bigint, number, "success" | "reverted", TransactionType> | null;
    }>;
} | null
transaction) {
  const { 
const depositAmount: bigint
depositAmount, 
const includesApproval: boolean
includesApproval } = 
const transaction: {
    depositAmount: bigint;
    includesApproval: boolean;
    execute: (options?: {
        onHash?: (hash: Hash) => void;
    }) => Promise<{
        hash: Hash;
        receipt: TransactionReceipt<bigint, number, "success" | "reverted", TransactionType> | null;
    }>;
}
transaction
  
var console: Console
console.
Console.log(...data: any[]): void
The console.log() static method outputs a message to the console.
MDN Reference
log("Deposit amount:", 
function formatUnits(value: bigint, options?: FormatUnitsOptions): string
formatUnits(
const depositAmount: bigint
depositAmount))
  
var console: Console
console.
Console.log(...data: any[]): void
The console.log() static method outputs a message to the console.
MDN Reference
log("Includes approval:", 
const includesApproval: boolean
includesApproval)

  const { 
const hash: `0x${string}`
hash } = await 
const transaction: {
    depositAmount: bigint;
    includesApproval: boolean;
    execute: (options?: {
        onHash?: (hash: Hash) => void;
    }) => Promise<{
        hash: Hash;
        receipt: TransactionReceipt<bigint, number, "success" | "reverted", TransactionType> | null;
    }>;
}
transaction.
execute: (options?: {
    onHash?: (hash: Hash) => void;
}) => Promise<{
    hash: Hash;
    receipt: TransactionReceipt<bigint, number, "success" | "reverted", TransactionType> | null;
}>
execute()
  
var console: Console
console.
Console.log(...data: any[]): void
The console.log() static method outputs a message to the console.
MDN Reference
log("Transaction confirmed:", 
const hash: `0x${string}`
hash)
}

// Now safe to upload

When storing data across multiple providers, pass an array of contexts. The SDK aggregates per-context lockup while computing account-level values (debt, runway, buffer) once.

import { 
class Synapse
Synapse, 
function formatUnits(value: bigint, options?: FormatUnitsOptions): string
formatUnits, 
const SIZE_CONSTANTS: {
    readonly KiB: 1024n;
    readonly MiB: bigint;
    readonly GiB: bigint;
    readonly TiB: bigint;
    readonly PiB: bigint;
    readonly MAX_UPLOAD_SIZE: 1065353216;
    readonly MIN_UPLOAD_SIZE: 127;
    readonly DEFAULT_UPLOAD_BATCH_SIZE: 32;
    readonly BYTES_PER_LEAF: 32n;
}
SIZE_CONSTANTS, 
const TIME_CONSTANTS: {
    readonly EPOCH_DURATION: 30;
    readonly EPOCHS_PER_DAY: 2880n;
    readonly EPOCHS_PER_MONTH: 86400n;
    readonly DAYS_PER_MONTH: 30n;
    readonly DEFAULT_LOCKUP_DAYS: 30n;
    readonly PERMIT_DEADLINE_DURATION: 3600;
}
TIME_CONSTANTS } from "@filoz/synapse-sdk"
import { 
function privateKeyToAccount(privateKey: Hex, options?: PrivateKeyToAccountOptions): PrivateKeyAccount@description Creates an Account from a private key.
@returns ― A Private Key Account.
privateKeyToAccount } from 'viem/accounts'
const 
const synapse: Synapse
synapse = 
class Synapse
Synapse.
Synapse.create(options: SynapseOptions): Synapse
create({ 
SynapseOptions.account: `0x${string}` | Account
account: 
function privateKeyToAccount(privateKey: Hex, options?: PrivateKeyToAccountOptions): PrivateKeyAccount@description Creates an Account from a private key.
@returns ― A Private Key Account.
privateKeyToAccount('0x...'), 
SynapseOptions.source: string | null
source: 'my-app' })

const 
const contexts: StorageContext[]
contexts = await 
const synapse: Synapse
synapse.
Synapse.storage: StorageManager
storage.
StorageManager.createContexts(options?: CreateContextsOptions): Promise<StorageContext[]>
createContexts({ 
CreateContextsOptions.copies?: number | undefined
copies: 3 })

// 1-year runway
const 
const oneYear: bigint
oneYear = 
const TIME_CONSTANTS: {
    readonly EPOCH_DURATION: 30;
    readonly EPOCHS_PER_DAY: 2880n;
    readonly EPOCHS_PER_MONTH: 86400n;
    readonly DAYS_PER_MONTH: 30n;
    readonly DEFAULT_LOCKUP_DAYS: 30n;
    readonly PERMIT_DEADLINE_DURATION: 3600;
}
TIME_CONSTANTS.
type EPOCHS_PER_MONTH: 86400n
EPOCHS_PER_MONTH * 12n

// Prepare a single deposit covering all 3 copies for 1 year
const { 
const costs: getUploadCosts.OutputType
costs, 
const transaction: {
    depositAmount: bigint;
    includesApproval: boolean;
    execute: (options?: {
        onHash?: (hash: Hash) => void;
    }) => Promise<{
        hash: Hash;
        receipt: TransactionReceipt<bigint, number, "success" | "reverted", TransactionType> | null;
    }>;
} | null
transaction } = await 
const synapse: Synapse
synapse.
Synapse.storage: StorageManager
storage.
StorageManager.prepare(options: PrepareOptions): Promise<PrepareResult>
prepare({
  
PrepareOptions.context?: StorageContext | StorageContext[] | undefined
context: 
const contexts: StorageContext[]
contexts,
  
PrepareOptions.dataSize: bigint
dataSize: 50n * 
const SIZE_CONSTANTS: {
    readonly KiB: 1024n;
    readonly MiB: bigint;
    readonly GiB: bigint;
    readonly TiB: bigint;
    readonly PiB: bigint;
    readonly MAX_UPLOAD_SIZE: 1065353216;
    readonly MIN_UPLOAD_SIZE: 127;
    readonly DEFAULT_UPLOAD_BATCH_SIZE: 32;
    readonly BYTES_PER_LEAF: 32n;
}
SIZE_CONSTANTS.
type GiB: bigint
GiB,
  
PrepareOptions.extraRunwayEpochs?: bigint | undefined
extraRunwayEpochs: 
const oneYear: bigint
oneYear,
})

const { 
const rate: {
    perEpoch: bigint;
    perMonth: bigint;
}
rate, 
const depositNeeded: bigint
depositNeeded, 
const ready: boolean
ready } = 
const costs: getUploadCosts.OutputType
costs
var console: Console
console.
Console.log(...data: any[]): void
The console.log() static method outputs a message to the console.
MDN Reference
log("Monthly rate (per copy):", 
function formatUnits(value: bigint, options?: FormatUnitsOptions): string
formatUnits(
const rate: {
    perEpoch: bigint;
    perMonth: bigint;
}
rate.
perMonth: bigint
perMonth), "USDFC")
var console: Console
console.
Console.log(...data: any[]): void
The console.log() static method outputs a message to the console.
MDN Reference
log("Total deposit needed:", 
function formatUnits(value: bigint, options?: FormatUnitsOptions): string
formatUnits(
const depositNeeded: bigint
depositNeeded), "USDFC")
var console: Console
console.
Console.log(...data: any[]): void
The console.log() static method outputs a message to the console.
MDN Reference
log("Account ready:", 
const ready: boolean
ready)

if (
const transaction: {
    depositAmount: bigint;
    includesApproval: boolean;
    execute: (options?: {
        onHash?: (hash: Hash) => void;
    }) => Promise<{
        hash: Hash;
        receipt: TransactionReceipt<bigint, number, "success" | "reverted", TransactionType> | null;
    }>;
} | null
transaction) {
  const { 
const hash: `0x${string}`
hash } = await 
const transaction: {
    depositAmount: bigint;
    includesApproval: boolean;
    execute: (options?: {
        onHash?: (hash: Hash) => void;
    }) => Promise<{
        hash: Hash;
        receipt: TransactionReceipt<bigint, number, "success" | "reverted", TransactionType> | null;
    }>;
}
transaction.
execute: (options?: {
    onHash?: (hash: Hash) => void;
}) => Promise<{
    hash: Hash;
    receipt: TransactionReceipt<bigint, number, "success" | "reverted", TransactionType> | null;
}>
execute()
  
var console: Console
console.
Console.log(...data: any[]): void
The console.log() static method outputs a message to the console.
MDN Reference
log("Funded:", 
const hash: `0x${string}`
hash)
}

prepare() returns:

costs: The full UploadCosts breakdown
transaction: A transaction object with execute(), or null if the account is already ready

The transaction automatically picks the right contract call:

Needs deposit + approval: calls depositWithPermitAndApproveOperator
Needs approval only: calls approveService
Needs deposit only: calls depositWithPermit
Already ready: returns transaction: null

Account Queries

Read-only APIs for account-level cost visibility.

// Aggregate rate across all active rails
const { 
const ratePerEpoch: any
ratePerEpoch, 
const ratePerMonth: any
ratePerMonth } = await 
any
synapse.
any
payments.
any
totalAccountRate()

// Sum of lockupFixed across all rails (including terminated but not finalized)
const { 
const totalFixedLockup: any
totalFixedLockup } = await 
any
synapse.
any
payments.
any
totalAccountLockup()

// Total storage size across all live datasets
import { 
function getAccountTotalStorageSize(client: Client<Transport, Chain>, options: getAccountTotalStorageSize.OptionsType): Promise<getAccountTotalStorageSize.OutputType>
getAccountTotalStorageSize } from '@filoz/synapse-core/warm-storage'
const { 
const totalSizeBytes: bigint
totalSizeBytes, 
const datasetCount: number
datasetCount } = await 
function getAccountTotalStorageSize(client: Client<Transport, Chain>, options: getAccountTotalStorageSize.OptionsType): Promise<getAccountTotalStorageSize.OutputType>
getAccountTotalStorageSize(
any
client, {
  
address: `0x${string}`
address: '0x...',
})

All rate values come in both per-epoch (contract-native) and per-month (ratePerEpoch * EPOCHS_PER_MONTH) units. Note that ratePerMonth from totalAccountRate() is computed as ratePerEpoch * EPOCHS_PER_MONTH — this is slightly less than the full-precision rate.perMonth returned by getUploadCosts() due to integer truncation. See Rate Precision for details.

Next Steps

Payments & Storage — Deep dive into the payment model mechanics
StorageManager API Reference — Full SDK storage API
PaymentsService API Reference — Full SDK payments API
Storage Operations — Storage concepts and workflows
Storage Context — Contexts and data sets