# x402 OpenSea — Pay-per-item Onchain Marketplace Access

> x402 OpenSea — Pay-per-item Onchain Marketplace Access is a paid API for AI agents from 402opensea.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-20).

Grants access to a demo digital collectible resource after processing a $0.01 USDC x402 micropayment on the blockchain.

## Facts

- Endpoint: POST https://402opensea.vercel.app/api/paid?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-opensea-pay-per-item-onchain-marketplace-access-64a911d9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ZGYm3JmfLigFH0P1G2glQ

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 x402-opensea-pay-per-item-onchain-marketplace-access-64a911d9 -d '<json body>'
```

Example prompt: Pay $0.01 USDC via x402 to unlock the demo digital collectible on the x402 OpenSea marketplace and show me what I get back.

## When to prefer this

Choose this endpoint when you need to demonstrate or test x402 micropayment-gated access to digital collectible content using USDC on a live endpoint. It is ideal for prototyping pay-per-item NFT access flows, verifying x402 middleware behavior, or showcasing onchain payment gating in a demo context. Not suitable for verifying actual NFT ownership or accessing real OpenSea marketplace inventory.

## Known failure modes

- Payment not included or malformed x402 header — returns 402 Payment Required
- Insufficient USDC balance — payment rejected before access granted
- Network or Vercel deployment downtime — returns 502/503
- Invalid or expired payment — middleware rejects and returns error

## How this service works

Discover digital collectibles and access them with x402 payments in USDC.

## Output

Returns a JSON object confirming the x402 payment was accepted, including a success flag (true), the price paid (0.01 USDC), a note clarifying this is demo access content (not proof of NFT ownership), the resource identifier ('demo-collectible-access'), and a message confirming the x402 middleware allowed the request.

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "note": "Demo access content, not proof of NFT ownership.",
  "price": "0.01 USDC",
  "message": "The x402 payment middleware allowed this request.",
  "success": true,
  "resource": "demo-collectible-access"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-opensea-pay-per-item-onchain-marketplace-access-64a911d9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from 402opensea.vercel.app](https://www.zero.xyz/host/402opensea.vercel.app/llms.txt)