Stabletrust for Private Agentic Finance

Private payments for AI agents. One key. Zero traces.

Stabletrust enables AI agents to transact privately on EVM chains — shield tokens, transfer confidentially, withdraw silently. Balances are encrypted on-chain. No one can see what your agent holds or where it sends.

Built for the private agent economy.

---

Quickstart

No SDK. No setup. Just POST.

// Shield tokens into a confidential account
await fetch("https://stabletrust-api.fairblock.network/deposit", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    privateKey: process.env.AGENT_KEY,
    tokenAddress: "0x036CbD53842c5426634e7929541eC2318f3dCF7e", // USDC
    amount: "10000000", // 10 USDC
    chainId: 84532, // Base Sepolia
  }),
});

That's it. Your agent now has a private balance no one can read.

---

Agent Flow

EOA → [deposit] → Confidential Account → [transfer] → Recipient
                                        → [withdraw] → EOA

1. Deposit — shield ERC-20 tokens. Balance becomes encrypted on-chain.
2. Transfer — send privately to any address. Amount is invisible on-chain.
3. Withdraw — unshield back to public ERC-20 at any time.
4. Balance — your agent can always check its own decrypted balance.

---

API

POST /deposit

const res = await fetch("https://stabletrust-api.fairblock.network/deposit", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    privateKey: process.env.AGENT_KEY,
    tokenAddress: "0x036CbD53842c5426634e7929541eC2318f3dCF7e",
    amount: "10000000",
    chainId: 84532,
  }),
});

const { receipt } = await res.json();
// { hash: '0x...' }

POST /balance

const res = await fetch("https://stabletrust-api.fairblock.network/balance", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    privateKey: process.env.AGENT_KEY,
    tokenAddress: "0x036CbD53842c5426634e7929541eC2318f3dCF7e",
    chainId: 84532,
  }),
});

const { balance } = await res.json();
// { total: '10000000', available: '10000000', pending: '0' }

POST /transfer

const res = await fetch("https://stabletrust-api.fairblock.network/transfer", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    privateKey: process.env.AGENT_KEY,
    recipientAddress: "0x...recipient",
    tokenAddress: "0x036CbD53842c5426634e7929541eC2318f3dCF7e",
    amount: "5000000", // 5 USDC
    chainId: 84532,
  }),
});

const { receipt } = await res.json();
// { hash: '0x...' }

POST /withdraw

const res = await fetch("https://stabletrust-api.fairblock.network/withdraw", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    privateKey: process.env.AGENT_KEY,
    tokenAddress: "0x036CbD53842c5426634e7929541eC2318f3dCF7e",
    amount: "5000000",
    chainId: 84532,
  }),
});

const { receipt } = await res.json();
// { hash: '0x...' }

---

Parameters

/deposit

Field	Type	Required	Description
privateKey	string	yes	Agent wallet private key
tokenAddress	string	yes	ERC-20 token contract address
amount	string	yes	Amount in token base units
chainId	number	yes	Target network chain ID
waitForFinalization	boolean	no	Wait for tx finality (default: true)

/balance

Field	Type	Required	Description
privateKey	string	yes	Agent wallet private key (used for decryption)
tokenAddress	string	yes	ERC-20 token contract address
chainId	number	yes	Target network chain ID
address	string	no	Address to query — defaults to wallet from privateKey

/transfer

Field	Type	Required	Description
privateKey	string	yes	Agent wallet private key
recipientAddress	string	yes	Recipient Ethereum address
tokenAddress	string	yes	ERC-20 token contract address
amount	string	yes	Amount in token base units
chainId	number	yes	Target network chain ID
useOffchainVerify	boolean	no	Off-chain proof verification (default: false)
waitForFinalization	boolean	no	Wait for tx finality (default: true)

/withdraw

Field	Type	Required	Description
privateKey	string	yes	Agent wallet private key
tokenAddress	string	yes	ERC-20 token contract address
amount	string	yes	Amount in token base units
chainId	number	yes	Target network chain ID
useOffchainVerify	boolean	no	Off-chain proof verification (default: false)
waitForFinalization	boolean	no	Wait for tx finality (default: true)

---

Supported Chains

Chain	ID
Base	8453
Base Sepolia	84532
Ethereum Sepolia	11155111
Arbitrum Sepolia	421614
Arc	5042002
Stable	2201
Tempo	42431

stablepay-api