---
title: "DAY PASS: 24 hours of Zambo MCP (153 total tools; core entry points on the default surface) for $0.99 USDC on Base. One payment, no API key."
method: POST
path: "/api/x402/day-pass"
tags: ["Discovery", "Zambo", "Day Pass"]
---

# DAY PASS: 24 hours of Zambo MCP (153 total tools; core entry points on the default surface) for $0.99 USDC on Base. One payment, no API key.

`POST /api/x402/day-pass`

## Request

- Base URL: `https://zambo.dev`
- URL: `https://zambo.dev/api/x402/day-pass`
- Auth: none declared. Required headers: `X-Payment`

Zambo is the verifiable work layer for AI. Day Pass = one x402 payment of $0.99 USDC on Base (eip155:8453) for 24 hours of access to the hosted Zambo MCP (https://zambo.dev/mcp). One payment covers 24 hours; no per-request settlement. Submit the base64 EIP-3009 payment envelope in X-Payment; after payment send header X-Zambo-Key. Every job returns a verifiable receipt (/run/<uuid>, /verify). Same pass via MCP tool day_pass_activate.

## Headers

- `X-Payment` string, required

## Request body

- object: Optional. Payment is conveyed in the X-Payment header as a base64 JSON x402 envelope; the body may be empty.

## Response `200`

Day Pass activated with receipt_url (https://zambo.dev/run/<uuid>), run_id, uuid, expires_at, access_key, how_to_use, and a verifiable spend receipt. If X-Zambo-Key is already active, returns already_active with usage.quota_tier=day_pass and no payment challenge.

## Other responses

- `402`: Payment missing, invalid, or not settled; the body advertises receipt_url, run_id, uuid, access_key, expires_at, x402_spend_receipt, and settlement_tx_hash on success

---

[API](https://skmtc.dev/zambo/apis/zambo-api.md) · [All operations](https://skmtc.dev/zambo/apis/zambo-api/llms.txt) · [OpenAPI document](https://skmtc.dev/zambo/apis/zambo-api/revisions/70eaaa7b062c?raw)