# Services from agent-exec.448c.net on Zero

> agent-exec.448c.net serves 12 paid API services for AI agents, indexed by Zero. Each is callable per call with payment handled by Zero.

Canonical page: https://www.zero.xyz/host/agent-exec.448c.net
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/agent-exec.448c.net/health.json

## Services

- [agent-exec Code Execution Sandbox](https://www.zero.xyz/c/agent-exec-code-execution-sandbox-e90fb652/llms.txt): $0.001/call via x402. Execute Python or Node.js source code in an isolated, network-less sandbox and return stdout, stderr, and exit code — billed per-use via x402 micropayment, no account required.
- [agent-exec URL Watch / Polling Monitor](https://www.zero.xyz/c/agent-exec-url-watch-polling-monitor-8623ca11/llms.txt): $0.0058/call via x402. Registers a pay-per-use HTTP polling watch that fires when a specified condition is met on a remote URL, returning a watch ID and status.
- [agent-exec Claim Key Renewal](https://www.zero.xyz/c/agent-exec-claim-key-renewal-42af4884/llms.txt): $0.0052/call via x402. Extends the expiration time of an existing agent-exec claim key by adding an hour, day, or week subscription plan on top of the remaining duration.
- [agent-exec URL Attestation (POST /attest)](https://www.zero.xyz/c/agent-exec-url-attestation-post-attest-40f3b680/llms.txt): $0.008/call via x402. Fetches a URL from the service's vantage point and returns a cryptographically signed attestation of the HTTP response metadata, including status code, content hash, and redirect chain.
- [agent-exec Storage — Pay-Per-Use Blob Storage (HTTP 402)](https://www.zero.xyz/c/agent-exec-storage-pay-per-use-blob-storage-http-402-57f06399/llms.txt): $0.0051/call via x402. Stores an arbitrary blob of data in a paid, temporary object store and returns an ID, expiry timestamp, plan, and payment receipt — no account or API key required.
- [Agent-Exec Handoff — Pay-Per-Use Agent Briefing Storage](https://www.zero.xyz/c/agent-exec-handoff-pay-per-use-agent-briefing-storage-1e3eabb2/llms.txt): $0.0053/call via x402. Stores a structured agent handoff briefing (done/not-done/in-flight state plus next action) and returns a UUID that a successor agent can use to resume work, billed per-call via x402 micropayment with no account required.
- [agent-exec Distributed Lock Claim (POST /claim)](https://www.zero.xyz/c/agent-exec-distributed-lock-claim-post-claim-80425126/llms.txt): $0.0052/call via x402. Acquires a named, time-bounded distributed lock (hold) on a key for a specified plan duration, billed per attempt via HTTP 402 micropayment.
- [agent-exec Storage Object Renewal](https://www.zero.xyz/c/agent-exec-storage-object-renewal-00742fd0/llms.txt): $0.0051/call via x402. Renews the retention window of a stored object in agent-exec's sandboxed storage by paying per-use via HTTP 402, extending its expiry without losing remaining time.
- [agent-exec Storage Object Replace](https://www.zero.xyz/c/agent-exec-storage-object-replace-9e26c5c0/llms.txt): $0.0051/call via x402. Replaces the content of an existing stored object by ID, updating its size, label, and retention window, paid per-call via HTTP 402 with no account required.
- [agent-exec Deadman Switch Registration](https://www.zero.xyz/c/agent-exec-deadman-switch-registration-88ae8539/llms.txt): $0.0054/call via x402. Registers a pay-per-use deadman switch: if the agent fails to confirm before the lease expires, a probe URL is automatically checked to verify liveness or task completion.
- [agent-exec Listing Promotion](https://www.zero.xyz/c/agent-exec-listing-promotion-04b2d254/llms.txt): $0.0667/call via x402. Promotes a listing in the agent-exec directory to a paid tier for a chosen duration (day, week, or month), paying via x402 USDC.
- [agent-exec Drift Monitor — API Endpoint Change Detector](https://www.zero.xyz/c/agent-exec-drift-monitor-api-endpoint-change-detector-fead0fce/llms.txt): $0.0061/call via x402. Fetches a live snapshot of a known AI-agent-related API endpoint and compares it to a previously recorded baseline, returning both versions and a diff event log.

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

- [Zero catalog index](https://www.zero.xyz/llms.txt)