# Coin Railz Seamless Chain Bridge - Cross-Chain USDC Transfer via Circle CCTP

> Coin Railz Seamless Chain Bridge - Cross-Chain USDC Transfer via Circle CCTP is a paid API for AI agents from coinrailz.com, paid per call via x402, $2/call, status unknown (last checked 2026-09-14).

Bridges USDC across blockchains (Ethereum, Base, Polygon, Arbitrum) using Circle's CCTP for near-instant cross-chain transfers

## Facts

- Endpoint: POST https://coinrailz.com/x402/service/seamless-chain-bridge
- Price: $2/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/coin-railz-seamless-chain-bridge-cross-chain-usdc-transfer-via-circle-01c3060f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_MH_OXBytZBOaYG99vYQRm

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability coin-railz-seamless-chain-bridge-cross-chain-usdc-transfer-via-circle-01c3060f -d '<json body>'
```

Example prompt: Bridge 500 USDC from Ethereum (from my wallet 0xABCDef1234567890abcdef1234567890abcdef12) to Base network, sending it to my Base address 0x9876543210fedcba9876543210fedcba98765432.

## When to prefer this

Use this endpoint when an agent needs to move USDC between Ethereum mainnet and L2 chains (Base, Polygon, Arbitrum) and requires a structured transaction response with time estimates. Prefer over manual DEX bridging when Circle CCTP-backed reliability and instant finality are required.

## Known failure modes

- Invalid or unsupported source/destination chain combination
- Malformed wallet addresses for fromAddress or toAddress
- Amount too low or too high for bridge limits
- Insufficient USDC balance on source chain
- Circle CCTP attestation delay or timeout
- Network congestion causing slower-than-estimated completion

## How this service works

Cross-chain USDC routing via Circle CCTP - Pay on Ethereum, receive on Base/Polygon/Arbitrum instantly (Premium B2B2C Infrastructure)

## Output

Returns a bridgeTransaction object with cross-chain transaction details and an estimatedTime (in seconds) for when the USDC will arrive on the destination chain via Circle CCTP.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "amount",
  "toChain",
  "fromChain",
  "toAddress",
  "fromAddress"
 ],
 "properties": {
  "amount": {
   "type": "string",
   "description": "USDC amount to bridge"
  },
  "toChain": {
   "enum": [
    "ethereum",
    "polygon",
    "base",
    "arbitrum",
    "optimism"
   ],
   "type": "string",
   "description": "Destination blockchain"
  },
  "currency": {
   "type": "string",
   "description": "Currency to bridge (default: USDC)"
  },
  "fromChain": {
   "enum": [
    "ethereum",
    "polygon",
    "base",
    "arbitrum",
    "optimism"
   ],
   "type": "string",
   "description": "Source blockchain"
  },
  "toAddress": {
   "type": "string",
   "description": "Recipient wallet address on destination chain"
  },
  "fromAddress": {
   "type": "string",
   "description": "Sender wallet address"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "estimatedTime": {
   "type": "number",
   "description": "Estimated completion time in seconds"
  },
  "bridgeTransaction": {
   "type": "object",
   "description": "Cross-chain bridge transaction details"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/coin-railz-seamless-chain-bridge-cross-chain-usdc-transfer-via-circle-01c3060f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from coinrailz.com](https://www.zero.xyz/host/coinrailz.com/llms.txt)