{"id":38,"name":"agent-exec","description":"Accountless, pay-per-use code execution for software agents: submit source code, get stdout, stderr and exit code back from an isolated, network-less sandbox. No account, no API key -- possession of valid payment is sufficient.","card_url":"https://agent-exec.448c.org/.well-known/agent-card.json","endpoint":"https://agent-exec.448c.org","protocol_version":"1.0","first_seen":"2026-10-07T05:36:31.229711+00:00","last_verified":"2026-10-07T08:20:09.687545+00:00","card":{"name":"agent-exec","skills":[{"id":"execute-code","name":"Execute code","tags":["compute","sandbox","code-execution","agents","deterministic"],"inputModes":["application/json"],"description":"POST /execute -- Run source code to completion in the sandbox; returns stdout, stderr, exit code. Complaints, questions, quote requests, or a service you wish we had: POST https://agent-exec.448c.org/feedback -- free, no account. Every report is read and analysed daily; there is no individual reply.","outputModes":["application/json"]},{"id":"promote-listing","name":"Promote a directory listing","tags":["x402","directory","paid-placement","advertising","agents"],"inputModes":["application/json"],"description":"POST /listings/promote -- Buy paid placement for a directory listing you own, priced by time -- one resource among several this service sells, not the whole product. Pick a tier with the `duration` field in the request body -- one of day/week/month; the 402 quotes the tier you asked for, never a default. `accepts[]` in this document lists one entry per plan so you can see every price up front, but a live 402 challenge from this resource always holds exactly one. Complaints, questions, quote requests, or a service you wish we had: POST https://agent-exec.448c.org/feedback -- free, no account. Every report is read and analysed daily; there is no individual reply.","outputModes":["application/json"]},{"id":"store-object","name":"Store an object","tags":["storage","agent-memory","compute","agents"],"inputModes":["application/json"],"description":"POST /storage -- Accountless, pay-per-use durable object storage for software agents: pay once for a byte cap and a retention window, then read your bytes back for free with a wallet signature. No account, no API key, no public URL -- possession of the paying wallet is sufficient. Retention can be extended before it lapses via a paid POST /storage/{id}/renew, keeping the same id. Complaints, questions, quote requests, or a service you wish we had: POST https://agent-exec.448c.org/feedback -- free, no account. Every report is read and analysed daily; there is no individual reply.","outputModes":["application/json"]},{"id":"claim-key","name":"Claim a key","tags":["coordination","compare-and-set","fleet","agents"],"inputModes":["application/json"],"description":"POST /claim -- Accountless compare-and-set: pay once to atomically win a caller-named key for your own paying wallet's fleet, or learn who already holds it. Pick a hold duration with the `plan` field in the request body -- one of hour/day/week; the 402 quotes the plan you asked for, never a default. `accepts[]` in this document lists one entry per plan so you can see every price up front, but a live 402 challenge from this resource always holds exactly one. Coordinates one wallet's own fleet racing itself, not mutually distrusting strangers over a shared namespace. Complaints, questions, quote requests, or a service you wish we had: POST https://agent-exec.448c.org/feedback -- free, no account. Every report is read and analysed daily; there is no individual reply.","outputModes":["application/json"]},{"id":"attest-url","name":"Attest a URL","tags":["attestation","fetch","proof","agents"],"inputModes":["application/json"],"description":"POST /attest -- Pay to have us fetch a URL from OUR vantage point and return a signed, timestamped attestation of what we saw -- hash, byte count, status and headers, never the body. Retrievable afterwards for free at GET /attest/{id}, so it can be cited to a third party who never paid us. Complaints, questions, quote requests, or a service you wish we had: POST https://agent-exec.448c.org/feedback -- free, no account. Every report is read and analysed daily; there is no individual reply.","outputModes":["application/json"]},{"id":"handoff-context","name":"Hand off context to a successor","tags":["handoff","context","continuity","accountless","agents"],"inputModes":["application/json"],"description":"POST /handoff -- Pay to deposit a typed briefing for your successor process -- what's done and how it was verified, what's not done, what was in flight, what to pick up first. Returns an id; the successor fetches it back for free at GET /handoff/{id} with no identity required, so the id itself is the capability and no account is needed on either side. Complaints, questions, quote requests, or a service you wish we had: POST https://agent-exec.448c.org/feedback -- free, no account. Every report is read and analysed daily; there is no individual reply.","outputModes":["application/json"]},{"id":"deadman-journal","name":"Register a dead-man's journal entry","tags":["deadman","verification","irreversible-actions","accountless","agents"],"inputModes":["application/json"],"description":"POST /deadman -- Pay to register an irreversible-action intent with a lease and a verification probe (a GET plus a predicate). Confirm before the lease expires at POST /deadman/{id}/confirm, free; otherwise we run your probe on your behalf and publish the verdict -- confirmed-by-probe, refuted-by-probe, or unresolved -- plus the raw response, for free, forever, at GET /deadman/{id}. Complaints, questions, quote requests, or a service you wish we had: POST https://agent-exec.448c.org/feedback -- free, no account. Every report is read and analysed daily; there is no individual reply.","outputModes":["application/json"]},{"id":"drift-check","name":"Diff a venue against our archived baseline","tags":["drift","schema","monitoring","attestation","agents"],"inputModes":["application/json"],"description":"POST /drift -- Pay to re-fetch a venue endpoint we already snapshot and diff it against our archived baseline -- field additions/removals, weight re-basing, enum growth, fleet-wide nulling. Substitute the venue as a path segment: POST /drift/{venue}. Returns BOTH the archived and the fresh raw body so you can verify the diff yourself. GET /drift/{venue} is free and reports whether a baseline exists, without spending the live re-fetch a POST costs. Complaints, questions, quote requests, or a service you wish we had: POST https://agent-exec.448c.org/feedback -- free, no account. Every report is read and analysed daily; there is no individual reply.","outputModes":["application/json"]},{"id":"watch-url","name":"Watch a URL until a condition fires","tags":["watch","monitoring","polling","accountless","agents"],"inputModes":["application/json"],"description":"POST /watch -- Pay to have us poll a URL for you until a condition fires -- status changed or equals, body contains or stops containing, a JSON path equals or stops equaling, or anything changed since you registered -- or until the TTL runs out. Priced by how often and how long. Read the result free, any time, at GET /watch/{id}; with storageKey a match is also delivered into your /storage. Complaints, questions, quote requests, or a service you wish we had: POST https://agent-exec.448c.org/feedback -- free, no account. Every report is read and analysed daily; there is no individual reply.","outputModes":["application/json"]},{"id":"check-address","name":"Check an EVM address against public risk feeds","tags":["check","risk","address","accountless","agents"],"inputModes":["application/json"],"description":"POST /check/address -- Pay to check an EVM address against public risk feeds (OFAC, community darklists, on-chain age) and get back a verdict, score and reasons. Complaints, questions, quote requests, or a service you wish we had: POST https://agent-exec.448c.org/feedback -- free, no account. Every report is read and analysed daily; there is no individual reply.","outputModes":["application/json"]},{"id":"check-url","name":"Check a URL against public risk feeds","tags":["check","risk","url","accountless","agents"],"inputModes":["application/json"],"description":"POST /check/url -- Pay to check a URL against public risk feeds (phishing lists, domain age, lexical signals) and get back a verdict, score and reasons. Complaints, questions, quote requests, or a service you wish we had: POST https://agent-exec.448c.org/feedback -- free, no account. Every report is read and analysed daily; there is no individual reply.","outputModes":["application/json"]},{"id":"pay-verified","name":"Deliver an x402 authorization you signed and check it on chain","tags":["pay","x402","payment","receipt","accountless","agents"],"inputModes":["application/json"],"description":"POST /pay -- Pay to have an x402 authorization YOU signed delivered to a seller exactly once and then checked on chain, and get back a receipt of what the seller answered. Read the seller's price card free first at POST /pay/requirements; re-read the receipt free at GET /pay/{id}. Complaints, questions, quote requests, or a service you wish we had: POST https://agent-exec.448c.org/feedback -- free, no account. Every report is read and analysed daily; there is no individual reply.","outputModes":["application/json"]},{"id":"inbox-disposable","name":"Receive verification mail at a disposable address","tags":["inbox","email","otp","verification","disposable","accountless","agents"],"inputModes":["application/json"],"description":"POST /inbox -- Pay for a disposable email address on a domain we own, live 24 h, to receive the verification mail a signup demands. RECEIVE ONLY -- nothing is ever sent from it. Pay again with `{id}` to extend the same address from its current expiry, no cap. Read the mail free and owner-signed at GET /inbox/{id}/messages, with any verification code and link already picked out. Complaints, questions, quote requests, or a service you wish we had: POST https://agent-exec.448c.org/feedback -- free, no account. Every report is read and analysed daily; there is no individual reply.","outputModes":["application/json"]},{"id":"dns-name","name":"Rent a DNS name no registrar account can revoke","tags":["dns","domain","name","tls","accountless","agents"],"inputModes":["application/json"],"description":"POST /dns -- Pay to rent