Gateway Fast Deposits on Testnet

The testnet environment lets you test Fast Deposits for Circle Gateway on Sepolia testnets before going live. No API key required.

Environment

Base URL: https://api.testnet.eco.com/circle-gateway No API key or auth headers are required. Send USDC only; other tokens sent to a deposit address are not recoverable.

Chain	Chain ID	Role	USDC
Base Sepolia	84532	Source	`0x036CbD53842c5426634e7929541eC2318f3dCF7e`
OP Sepolia	11155420	Source	`0x5fd84259d66Cd46123540766Be93DFE6D43130D7`
Arbitrum Sepolia	421614	Source	`0x75faf114eafb1BDbe2F0316DF893fd58CE46AA4d`
Polygon Amoy	80002	Destination	`0x41E94Eb019C0762f9Bfcf9Fb1E58725BfB0e7582`

Get testnet USDC for all four chains from Circle’s faucet. You need a little native gas on the source chain to send transfers, unless you fund gaslessly.

Quickstart

Use the same API endpoints documented in Fast Deposits for Circle Gateway — the only difference is the base URL.

Create a quoted vault

curl -X POST https://api.testnet.eco.com/circle-gateway/api/v2/depositAddresses \
  -H "Content-Type: application/json" \
  -d '{
    "sourceChainId": 84532,
    "amount": "1000000",
    "recipient": "0xRecipientOnGateway",
    "depositor": "0xYourWalletAddress"
  }'

Fund it

Send exactly the quoted amount of USDC to the vaultAddress before the deadline. Use a direct transfer, Permit, or ERC-3009 gasless signature (see Funding methods).

Poll for completion

curl "https://api.testnet.eco.com/circle-gateway/api/v2/depositAddresses/{vaultAddress}?sourceChainId=84532"

When state is PUBLISHED, the funds have landed in Circle Gateway on Amoy.

⌘I

Programmable Addresses

Products

Architecture

Gateway Fast Deposits on Testnet

Environment

Quickstart

​Environment

​Quickstart

Environment

Quickstart