POSToken

About
Get Started

POST Token Whitepaper

POST Token Whitepaper

Documentation
Whitepaper
Section 09

Interoperability

POST Token is designed as a hub connecting traditional postal infrastructure with the broader blockchain ecosystem and global financial system, enabling seamless cross-chain and fiat interactions.

Three Interoperability Domains

Blockchain World

  • IBC (Inter-Blockchain Communication)
  • Ethereum via Axelar bridge
  • Bitcoin integration
  • Other L1 chains

Fiat Systems

  • Cash at post offices
  • Bank wire transfers
  • Card payments
  • Mobile money

Legacy Postal Systems

  • EDI messaging
  • EMSEVT tracking
  • IPC systems
  • S10 identifiers

IBC (Inter-Blockchain Communication)

As a Cosmos SDK chain, POST Token has native IBC support for seamless communication with the Cosmos ecosystem.

ChainTokenPurposePriority
Cosmos Hub
ATOM
Ecosystem credibility
1
Osmosis
OSMO
Primary DEX for POST liquidity
2
Noble
USDC
USDC integration for fiat on/off ramp
3
Axelar
AXL
Bridge to EVM chains
4

IBC Capabilities

Token Transfers

POST to other IBC assets

Cross-chain Queries

Verify state on other chains

Interchain Accounts

Control accounts on other chains

Interchain Security

Shared security model (future)

IBC Transfer Example: POST to Osmosis

// Step 1: Initiate Transfer
IBCTransfer(1000 POST, channel-osmosis, osmosis1xyz...)

// Step 2: Packet created and relayed
{ sourceChannel: "channel-1", token: "POST", amount: "1000" }

// Step 3: Osmosis receives and mints wrapped POST
User receives: 1000 ibc/POST on Osmosis

Time: ~30 seconds | Cost: ~0.01 POST

Ethereum Bridge (via Axelar)

POST Token
  • Gateway contract (lock/unlock POST)
  • IBC connection to Axelar
Axelar Network
  • Cross-chain routing
  • 75+ validators, $1B+ stake
Ethereum
  • wPOST ERC-20 token
  • Gateway contract (mint/burn)

Wrapped POST (wPOST) Properties

Token StandardERC-20
Decimals6 (matching native POST)
Backing1:1 with locked POST on native chain
MintingOnly via bridge (no admin mint)

wPOST Use Cases on Ethereum

Uniswap Liquidity

wPOST/ETH and wPOST/USDC pairs

DeFi Collateral

Aave/Compound (future)

CEX Listings

Many CEXs prefer ERC-20

Institutional Access

Familiar custody solutions

Bitcoin Integration

Option 1: Threshold tBTC

  • Decentralized BTC custody
  • 1:1 BTC backing
  • Bridge via Ethereum
  • For: DeFi users, larger amounts

Option 2: Atomic Swaps

  • Hash Time-Locked Contracts (HTLC)
  • Trustless BTC to POST swaps
  • Direct peer-to-peer
  • For: Privacy-conscious users

Option 3: Centralized Exchange

  • Trade BTC for POST on CEX
  • Withdraw POST to native chain
  • For: Simplicity, smaller amounts

Future: Lightning Network Integration

Accept Bitcoin payments for shipping costs with automatic BTC to POST to PSDR conversion. Bitcoin-native users can access postal services seamlessly.

Fiat On/Off Ramps

MethodCoverageSpeedLimits
Post Office Cash600,000+ locations
Instant
$10-$10,000/day
Bank Wire50+ countries
1-3 days
$5,000+
Card PaymentGlobal
~5 minutes
$20-$20,000/month
Mobile MoneyAfrica, Asia
Instant
Varies by provider

Post Office Cash Ramps

ON-RAMP: Cash to POST

Customer at Post Office

Provides ID + Cash

Clerk Verifies KYC

Existing postal KYC process

Gateway Mints POST

POST credited to customer wallet

Complete

Instant settlement

Spread: 1-2% | Min: $10 | Max: $10,000/day

OFF-RAMP: POST to Cash

Customer Shows QR Code

Wallet QR or address

Gateway Burns POST

POST removed from wallet

Post Office Credits PSDR

Internal settlement

Cash Dispensed

Customer receives cash

Spread: 1-2% | Fee: 0.5% | Max: $5,000/day

Card Network Integration

Buy POST with Card

Partners: Moonpay, Transak, Simplex

  • Select amount on POST website
  • Complete card details + 3DS verification
  • KYC verification (first time)
  • POST credited in ~5 minutes

Fee: 3-4% | Min: $20 | Max: $20,000/month

POST Debit Card

Visa/Mastercard branded - Spend POST anywhere

  • Spend POST/PSDR at 80M+ merchants
  • Auto-convert POST to fiat at point of sale
  • Real-time spending notifications
  • Virtual (instant) + Physical card options

Daily spend: $10,000 | Monthly: $50,000 | ATM: $500/day

Mobile Money Integration

Critical for emerging markets: 1.2 billion mobile money accounts globally, primary financial access in Africa and Asia.

PlatformCountriesMonthly Users
M-PesaKenya, Tanzania
50M+
MTN MoMo16 African
60M+
Orange Money18 countries
60M+
GCashPhilippines
80M+
PaytmIndia
350M+
AlipayChina
1B+

M-Pesa Integration Flow

ON-RAMP (M-Pesa to POST)

  • Select "Buy POST" in POST app
  • Choose M-Pesa payment
  • Receive M-Pesa push notification
  • Enter M-Pesa PIN to confirm
  • POST credited in ~30 seconds

OFF-RAMP (POST to M-Pesa)

  • Select "Sell POST" in POST app
  • Enter M-Pesa phone number
  • Confirm POST amount
  • M-Pesa receives KES instantly

Total fees: 1.5-2.5% (Mobile money fee + 0.5% POST network fee)

UPU Standards Integration

POST Token integrates with existing UPU technical standards, enabling gradual migration without replacing existing systems.

StandardPurposePOST Integration
S10
Item identificationTracking ID format compatible
EMSEVT
EMS tracking eventsMaps to PoT events
ITMATT
Item attributesStored in shipment metadata
PREDES
Pre-advice/manifestsOn-chain manifest creation
RESDES
Delivery resultsMaps to PoD events

EDI to Blockchain Gateway

Existing postal IT systems continue working while POST Token adds transparency and instant settlement.

Existing Postal System          POST Token
────────────────────          ────────────

EDI Message (EMSEVT)  ───────►  EDI Gateway
                                    │
                                    ▼
                              Blockchain Transaction
                                    │
                                    ▼
                              Instant Settlement

API & Developer Tools

REST API

/v1/rates       - POST/PSDR rates
/v1/tracking    - Package tracking
/v1/transfer    - Money transfer
/v1/merchant    - Merchant payments
/v1/balance     - Wallet balances

SDKs

  • JavaScript/TypeScript (@postnetwork/sdk)
  • Python (postnetwork-py)
  • Go (go-postnetwork)
  • Rust (postnetwork-rs)
  • Java (postnetwork-java)

Integration Templates

  • Shopify plugin
  • WooCommerce plugin
  • POS integration guide
  • Mobile wallet SDK
  • Postal IT connector

Developer Resources

docs.postnetwork.io

Full documentation

Testnet + Faucet

Free test tokens

Sandbox

Safe testing environment

Grant Program

Funding for integrations

Section 9: Key Takeaways

Cross-Chain Bridges

  • IBC: Native Cosmos interoperability
  • Ethereum: Axelar bridge, wPOST (ERC-20)
  • Bitcoin: tBTC, atomic swaps, Lightning (future)
  • Multi-chain: Polygon, BNB, Arbitrum planned

Fiat On/Off Ramps

  • Post office cash: 600,000+ locations, instant
  • Bank wires: Large transactions, 50+ countries
  • Card payments: Visa/MC via partners
  • Mobile money: M-Pesa, GCash, Paytm, etc.

Legacy Integration

  • UPU standards: S10, EMSEVT, PREDES compatible
  • EDI gateway: Bridge to existing postal IT
  • IPC systems: CAPE, EPG, PRIME integration
  • Customs: ASYCUDA, ICS2, ACE pre-clearance

Developer Tools

  • REST, WebSocket, GraphQL APIs
  • SDKs in 5 languages
  • E-commerce plugins
  • Testnet and sandbox environments