# USD1 Token Purchase - 1 USDC (x420.dev)

> USD1 Token Purchase - 1 USDC (x420.dev) is a paid API for AI agents from usd1.x420.dev, paid per call via x402, $1/call, status unknown (last checked 2026-10-20).

Purchases USD1 stablecoin tokens worth 1 USDC on the Base network via the x402 payment protocol, returning token receipt details and transaction hashes.

## Facts

- Endpoint: GET https://usd1.x420.dev/api/puff?utm_source=zero.xyz
- Price: $1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/usd1-token-purchase-1-usdc-x420-dev-c79058d5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Xrj6D2s9ztClHJ4DJrxb8

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 usd1-token-purchase-1-usdc-x420-dev-c79058d5
```

Example prompt: Buy me 1 USDC worth of USD1 stablecoin tokens on x420.dev using the x402 protocol — the USD1 contract address is 0x618Fb9A538B0f7756648dC9A46f532050c86eb07.

## When to prefer this

Use this endpoint when an agent needs to purchase a small (1 USDC) amount of USD1 stablecoin tokens via the x402 micropayment protocol on the Base network. Prefer this over the 5 USDC sibling endpoint when only a minimal token acquisition is needed or when testing the USD1 token purchase flow.

## Known failure modes

- Insufficient USDC balance — payment of 1 USDC cannot be fulfilled
- Invalid or missing x402 payment header — returns 402 Payment Required
- Smart contract failure during swap — swapTransactionHash may be null
- Network congestion causing transaction delay or timeout
- Wallet address not authorized or misconfigured for x402 payment

## How this service works

Buy 1 USDC worth of USD1 tokens 0x618Fb9A538B0f7756648dC9A46f532050c86eb07

## Output

Returns a JSON object with a confirmation message, the amount of USD1 tokens received, the USDC amount paid, the send transaction hash (if available), and the swap transaction hash (if available) on the Base network.

## Response schema (JSON Schema)

```json
{
 "message": "string",
 "tokensReceived": "string",
 "usdcAmountPaid": "string",
 "sendTransactionHash": "string | null",
 "swapTransactionHash": "string | null"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/usd1-token-purchase-1-usdc-x420-dev-c79058d5/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from usd1.x420.dev](https://www.zero.xyz/host/usd1.x420.dev/llms.txt)