# Services from agent-exec.448c.org on Zero > agent-exec.448c.org serves 18 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.org Live health (JSON, refreshed every minute): https://www.zero.xyz/host/agent-exec.448c.org/health.json ## Services - [agent-exec Sandboxed Code Execution](https://www.zero.xyz/c/agent-exec-sandboxed-code-execution-5117fbc8/llms.txt): $0.001/call via x402. Executes Python or Node.js source code in an isolated, network-less sandbox and returns stdout, stderr, and exit code — pay-per-use via x402, no account required. - [agent-exec URL Watch / Polling Monitor](https://www.zero.xyz/c/agent-exec-url-watch-polling-monitor-bd4fb796/llms.txt): $0.0058/call via x402. Registers a paid, accountless HTTP polling watch that fires when a URL's response meets a specified condition (status code, body content, or JSON path value). - [agent-exec Claim Key Renewal](https://www.zero.xyz/c/agent-exec-claim-key-renewal-2646e9a3/llms.txt): $0.0052/call via x402. Extends the expiration of an existing agent-exec sandbox claim key by adding an hour, day, or week to its current remaining time. - [agent-exec Storage Object Renewal](https://www.zero.xyz/c/agent-exec-storage-object-renewal-900af2ca/llms.txt): $0.0051/call via x402. Renews the retention window of a stored object in the agent-exec sandbox by paying per-use via HTTP 402, extending its expiry without losing existing time. - [agent-exec Inbox Registration (pay-per-use, HTTP 402)](https://www.zero.xyz/c/agent-exec-inbox-registration-pay-per-use-http-402-e50d25b5/llms.txt): $0.02/call via x402. Registers or extends a pay-per-use code-execution inbox address for an AI agent, requiring no account or API key — only a valid USDC micropayment via HTTP 402. - [Agent-Exec Distributed Lock Claim (Paid)](https://www.zero.xyz/c/agent-exec-distributed-lock-claim-paid-12326854/llms.txt): $0.0052/call via x402. Acquires a named distributed lock (key hold) for a specified duration using pay-per-use crypto payment, returning acquisition outcome and hold metadata. - [agent-exec Storage Object Replace](https://www.zero.xyz/c/agent-exec-storage-object-replace-ddcd772c/llms.txt): $0.0051/call via x402. Replaces the content of an existing storage object in-place, extending or preserving its retention window, with pay-per-use USDC micropayment and no account required. - [EVM Address Risk Check](https://www.zero.xyz/c/evm-address-risk-check-71803241/llms.txt): $0.02/call via x402. Checks an EVM wallet address for risk signals, returning a verdict, numeric score, reasons, and data sources — paid per-call via x402 with no account required. - [agent-exec Pay-Per-Use Code Execution](https://www.zero.xyz/c/agent-exec-pay-per-use-code-execution-4a935983/llms.txt): $0.02/call via x402. Executes arbitrary source code in an isolated, network-less sandbox and returns stdout, stderr, and exit code — no account or API key required, payment via x402. - [agent-exec URL Attestation](https://www.zero.xyz/c/agent-exec-url-attestation-7c2d09e4/llms.txt): $0.008/call via x402. Fetches a URL from a neutral vantage point and returns a cryptographically signed attestation of the HTTP response metadata, including status code, body hash, and redirect chain. - [agent-exec Storage Write (POST /storage)](https://www.zero.xyz/c/agent-exec-storage-write-post-storage-4bd844eb/llms.txt): $0.0051/call via x402. Stores an arbitrary blob of data in an isolated, pay-per-use object store, returning a UUID that can later be used to retrieve the object. - [URL Safety & Reputation Checker (agent-exec.448c.org/check/url)](https://www.zero.xyz/c/url-safety-reputation-checker-agent-exec-448c-org-check-url-7c7014a1/llms.txt): $0.02/call via x402. Checks a given URL or domain for safety, returning a verdict, numeric risk score, reasons, and sources — paid per-call via x402 with no account required. - [Agent-Exec Handoff Briefing — Pay-Per-Use Agent State Transfer](https://www.zero.xyz/c/agent-exec-handoff-briefing-pay-per-use-agent-state-transfer-4ca49fb5/llms.txt): $0.0053/call via x402. Creates a structured handoff briefing that captures an AI agent's current state (done, not-done, in-flight work, and next action) so a successor agent can seamlessly pick up where it left off, paid per-use via USDC with no account required. - [agent-exec Listing Promotion](https://www.zero.xyz/c/agent-exec-listing-promotion-2b9f08eb/llms.txt): $0.0667/call via x402. Promotes a listing in the agent-exec directory to paid tier for a chosen duration (day, week, or month), paid via x402 USDC. - [agent-exec /drift — API Drift Detection for x402 Venues](https://www.zero.xyz/c/agent-exec-drift-api-drift-detection-for-x402-venues-1de263a4/llms.txt): $0.0061/call via x402. Fetches a snapshot of a known x402 API marketplace venue and compares it against a stored baseline to detect changes (drift) in the live response. - [Agent-Exec Deadman Switch Registration](https://www.zero.xyz/c/agent-exec-deadman-switch-registration-ac05ae14/llms.txt): $0.0054/call via x402. Registers a pay-per-use deadman switch entry with a probe URL and lease duration, returning a UUID to confirm or let expire for automated verification. - [agent-exec DNS Renewal Endpoint](https://www.zero.xyz/c/agent-exec-dns-renewal-endpoint-0c57d124/llms.txt): $0.5/call via x402. Renews a DNS name record in the agent-exec sandbox environment using pay-per-use HTTP 402 payment, no account required. - [agent-exec DNS Record Manager (448c.net)](https://www.zero.xyz/c/agent-exec-dns-record-manager-448c-net-4715a4be/llms.txt): $0.5/call via x402. Creates or updates DNS records for a subdomain under 448c.net, pay-per-use with no account required. 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)