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

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

Purchases 1 USDC worth of BUILD tokens (contract 0xa8b9cc8f89C1dAb497fEA439848c020F64DB1b07) and delivers them to the caller

## Facts

- Endpoint: GET https://build.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/build-token-purchase-1-usdc-x420-dev-7f6a13b0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_xaaRTjjoee6w-hqaXT5l-

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 build-token-purchase-1-usdc-x420-dev-7f6a13b0
```

Example prompt: Buy me 1 USDC worth of BUILD tokens (contract 0xa8b9cc8f89C1dAb497fEA439848c020F64DB1b07) using the x420.dev BUILD endpoint.

## When to prefer this

Use this endpoint when you need to programmatically acquire a small (1 USDC) amount of BUILD tokens on-chain via the x402 micropayment protocol. Prefer this over the 5 USDC sibling endpoint when you want a minimal, low-risk purchase or are testing the integration. This is suitable for agents that need to autonomously acquire BUILD tokens without manual wallet interaction.

## Known failure modes

- Insufficient USDC balance — payment fails and no tokens are received
- x402 payment protocol error — request rejected before swap executes
- On-chain swap failure — USDC deducted but swap transaction hash is null indicating failure
- Network congestion — transaction may be delayed or dropped
- Invalid payment header — 402 response requiring correct x402 payment setup

## How this service works

Buy 1 USDC worth of BUILD tokens 0xa8b9cc8f89C1dAb497fEA439848c020F64DB1b07

## Output

Returns a message confirming the purchase, the amount of BUILD tokens received, the USDC amount paid, a send transaction hash, and a swap transaction hash (both may be null if not yet confirmed).

## Example request

```json
{}
```

## 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/build-token-purchase-1-usdc-x420-dev-7f6a13b0/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from build.x420.dev](https://www.zero.xyz/host/build.x420.dev/llms.txt)