# PolyPay Gasless USDC Deposit

> PolyPay Gasless USDC Deposit is a paid API for AI agents from api.polypay.pro, paid per call via x402, $10000/call, status unknown (last checked 2026-10-09).

Accepts a gasless USDC deposit to the PolyPay multisig wallet via EIP-3009 transferWithAuthorization, eliminating the need for ETH gas fees.

## Facts

- Endpoint: POST https://api.polypay.pro/api/x402/deposit/0x51806490898991fbf6cb4f2a6743dd4ef8f12a6b?utm_source=zero.xyz
- Price: $10000/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-09
- Success rate: 0% of calls made through Zero
- Activations on Zero: 1
- Tags: x402
- Canonical page: https://www.zero.xyz/c/api-polypay-pro-8b2e5647
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_kWlEkLMdpLJjpSmFYk3Zs

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 api-polypay-pro-8b2e5647 -d '<json body>'
```

Example prompt: Deposit 50 USDC (50000000 in 6-decimal units) to the PolyPay multisig gaslessly — I've already signed the EIP-3009 transferWithAuthorization message with my wallet.

## When to prefer this

Use this endpoint when you need to deposit USDC to the PolyPay multisig wallet without requiring the sender to hold ETH for gas, leveraging EIP-3009 meta-transaction signatures. Prefer this over standard ERC-20 approve+transfer flows when the user cannot or prefers not to pay L1/L2 gas fees directly.

## Known failure modes

- Amount outside allowed range [1000000, 10000000000] — request rejected
- Invalid or malformed EIP-3009 signature — authorization fails
- Signature deadline expired — transferWithAuthorization nonce no longer valid
- Incorrect from/to address in authorization — signature mismatch
- USDC allowance or balance insufficient on-chain — transaction reverts
- Network congestion causing delayed settlement

## How this service works

Gasless USDC deposit to PolyPay multisig 0x51806490898991fbf6cb4f2a6743dd4ef8f12a6b. Sign EIP-3009 transferWithAuthorization for any amount in [1000000, 10000000000] (6-decimals USDC).

## Output

A confirmation that the gasless USDC transfer was accepted and submitted to the PolyPay multisig (0x51806490898991fbf6cb4f2a6743dd4ef8f12a6b), typically including a transaction hash or deposit acknowledgement.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/api-polypay-pro-8b2e5647/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.polypay.pro](https://www.zero.xyz/host/api.polypay.pro/llms.txt)