# DfE AI Safety Evidence Toolkit Download (USDC on Base)

> DfE AI Safety Evidence Toolkit Download (USDC on Base) is a paid API for AI agents from pay.adamhaleworks.workers.dev, paid per call via x402, $149/call, status unknown (last checked 2026-10-19).

Delivers the UK Department for Education AI safety evidence toolkit as a downloadable ZIP file upon payment of 149 USDC on Base via x402 protocol.

## Facts

- Endpoint: GET https://pay.adamhaleworks.workers.dev/x402/v1/dfe-ai-safety-toolkit?utm_source=zero.xyz
- Price: $149/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/dfe-ai-safety-evidence-toolkit-download-usdc-on-base-5c4ecadf
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_aq34J-9jQ2oBH_nRe0SHa

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 dfe-ai-safety-evidence-toolkit-download-usdc-on-base-5c4ecadf
```

Example prompt: I need the DfE AI Safety Evidence Toolkit — can you pay for it with USDC on Base and get me the download link?

## When to prefer this

Choose this endpoint when you need the official UK Department for Education AI safety evidence toolkit as a packaged file, want instant automatic delivery without creating an account, and can pay with USDC on the Base network. It is purpose-built for one-shot crypto purchases of this specific DfE document bundle and is ideal for agents that can handle x402 payment flows.

## Known failure modes

- Payment insufficient or rejected — x402 payment header missing or underfunded, returns 402 Payment Required
- Download URL expired — signed URL is only valid for 48 hours after payment; accessing after expiry returns 403 or 401
- Invalid HMAC signature on download URL — tampering with URL parameters causes download rejection
- Network/worker errors — Cloudflare Workers outage returns 5xx; retry after delay
- Double-spend or replay detected — re-submitting the same payment nonce may be rejected

## How this service works

Buy UK school edtech renewal data (queries from $0.03, England snapshot 295 USDC) and the DfE AI safety evidence toolkit (149 USDC) with canonical USDC on Base. Automatic delivery, no account.

## Output

Returns a JSON object containing a time-limited (48-hour) signed download URL for the DfE-AI-Safety-Evidence-Toolkit-USDC.zip file, an 18-character order ID, an order status URL, the file name and byte size, and the published SHA-256 checksum for verification. No account or login is required.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "required": {
   "type": "string"
  },
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "file": {
   "name": "DfE-AI-Safety-Evidence-Toolkit-USDC.zip",
   "bytes": "<size>",
   "sha256": "<published on the guide page>"
  },
  "order": "<18-character order id>",
  "product": "dfe-ai-safety-toolkit",
  "download": {
   "url": "https://pay.adamhaleworks.workers.dev/download/dfe-ai-safety-toolkit?o=<order>&exp=<unix time>&sig=<HMAC>",
   "expires_at": "<48 hours after payment>"
  },
  "order_url": "https://pay.adamhaleworks.workers.dev/orders/<order>"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/dfe-ai-safety-evidence-toolkit-download-usdc-on-base-5c4ecadf/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from pay.adamhaleworks.workers.dev](https://www.zero.xyz/host/pay.adamhaleworks.workers.dev/llms.txt)