# Bounded Agent Utilities – Temporary UTF-8 File Handoff

> Bounded Agent Utilities – Temporary UTF-8 File Handoff is a paid API for AI agents from x402-46-225-191-113.sslip.io, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-22).

Accepts a base64-encoded UTF-8 file (TXT, CSV, or JSON) and stores it temporarily, returning a time-limited download URL with a SHA-256 checksum and download count.

## Facts

- Endpoint: POST https://x402-46-225-191-113.sslip.io/v1/handoff?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/bounded-agent-utilities-temporary-utf-8-file-handoff-5a669922
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_x4ZBowxbLfFhkI9d7qrb6

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 bounded-agent-utilities-temporary-utf-8-file-handoff-5a669922 -d '<json body>'
```

Example prompt: Upload this report.csv file (base64-encoded) as a temporary handoff artifact so another agent can download it — I need the download URL, SHA-256 checksum, and expiry date back.

## When to prefer this

Choose this endpoint when an AI agent needs to temporarily share a small UTF-8 text, CSV, or JSON file with another agent or downstream process via a secure, expiring download URL. It is ideal for agent-to-agent handoffs where the file should self-destruct after a fixed number of downloads or time window. Prefer this over persistent storage when you want automatic expiry, a built-in integrity checksum, and micro-payment-gated access via the x402 protocol.

## Known failure modes

- Filename does not match required pattern (alphanumeric, underscores, hyphens, must end in .txt/.csv/.json) — returns validation error
- data_base64 exceeds 1,398,104 character limit (~1 MB encoded) — returns payload too large error
- Invalid base64 encoding in data_base64 field — returns parse error
- Payment not provided or insufficient USDC balance — returns 402 Payment Required
- File content is not valid UTF-8 after decoding — may return encoding error

## How this service works

Temporary UTF-8 file handoff, cited HTTPX migration evidence and block-pinned Base USDC balances. See each route for its price, limits and output contract.

## Output

Returns a JSON object containing: the artifact ID (UUID), a temporary download URL, SHA-256 checksum of the file, file size in bytes, content type, creation and expiration timestamps, remaining allowed downloads, and the retention policy version applied. The download URL is valid for up to 7 days or 10 downloads, whichever comes first.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "filename": {
   "type": "string",
   "pattern": "^[A-Za-z0-9][A-Za-z0-9 _-]{0,99}\\.([tT][xX][tT]|[cC][sS][vV]|[jJ][sS][oO][nN])$",
   "maxLength": 105
  },
  "data_base64": {
   "type": "string",
   "maxLength": 1398104
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "bytes": 6,
  "sha256": "5891b5b522d5df086d0ff0b110fbd9d21bb4fc7163af34d08286a2e846f6be03",
  "created_at": "2026-10-21T18:00:00Z",
  "expires_at": "2026-10-28T18:00:00Z",
  "artifact_id": "00000000000000000000000000000000",
  "content_type": "text/plain; charset=utf-8",
  "download_url": "https://example.invalid/artifacts/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
  "downloads_remaining": 10,
  "retention_policy_version": "public-text-7d-10-downloads-v1"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/bounded-agent-utilities-temporary-utf-8-file-handoff-5a669922/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-46-225-191-113.sslip.io](https://www.zero.xyz/host/x402-46-225-191-113.sslip.io/llms.txt)