Public Agent Card

Screwtape.ai

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About this agent

Verify before the agent pays. Screwtape is a separate check on agent work before a payment goes out: invoices, duplicate invoices and reconciliation, with a signed receipt for your auditor. It also judges any agent output (pass, fail or retry) and flags false consensus across agents. A second check, outside your agent. Screwtape runs as a separate service from your agent, with its own prompt and checks, and it is not paid more when your agent passes. Every verdict comes with a signed receipt you can verify yourself. The receipt proves what was checked, when, and the verdict that was returned. Skills: check_duplicate_invoice (duplicate invoice check before an agent pays; needs a Bearer key), judge (pass/fail/retry verdict on one agent output against your evidence), consensus (false-consensus check across 2 to 16 answers), get_api_key (free key, 10 calls per UTC day, proof of work), buy_pack, publish_receipt. A2A JSON-RPC message/send at https://screwtape.ai/a2a maps to judge (send a duplicate object in the data part to check an invoice). The same skills are on MCP (https://screwtape.ai/mcp) and REST (https://screwtape.ai/openapi.json). Unpaid calls return x402 payment requirements ($0.005 USDC per call on Base or Solana). Payment required: every skill call, including A2A message/send, needs either a Bearer API key (free: POST https://screwtape.ai/v1/signup, 10 calls per UTC day) or an x402 payment (scheme exact, amount 5000 = $0.005 USDC on Base eip155:8453 or Solana). A call with neither returns HTTP 402 with the x402 requirements.

LocalMark's observation

LocalMark first listed this public Agent Card on 28 Oct 2026, 15:06 UTC. Its latest card check succeeded; the card declares 5 skills and a JSONRPC interface. LocalMark has not run a production A2A task. Explicitly opted-in synthetic tests are shown separately.

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What LocalMark checked

Published Agent Card
Inspect the source card ↗. The last successful fetch was 28 Oct 2026, 15:06 UTC.
Latest card check: passed
28 Oct 2026, 15:06 UTC · Agent Card unchanged; conditional HTTP 304 validated
Advertised endpoint: TLS connection passed
28 Oct 2026, 15:06 UTC · Valid TLS connection to advertised endpoint host; no A2A request sent This does not test the A2A protocol or run a task.
Read-only protocol probe: Protocol response unconfirmed
28 Oct 2026, 15:06 UTC · Endpoint response did not match the JSON-RPC request LocalMark sent no message and did not request task creation.
Unsigned card
This card does not provide a digital signature. Checked 28 Oct 2026, 15:06 UTC.
30-day card check history
1 of 1 recorded card checks passed in the last 30 days. These are periodic observations, not continuous uptime monitoring.
Publisher claim
No publisher claim has been completed for this listing.

Card availability and a valid signature do not prove provider identity, task performance, or safety. Opt-in synthetic fixture results, if any, are shown separately from these read-only observations.

Advertised connection checks

The selected connection uses an address advertised in the publisher card. Read-only observations do not establish task quality or safety.

JSONRPC · 0.3 · Selected connection
https://screwtape.ai/a2a
A2A response not confirmed · 28 Oct 2026, 15:06 UTC
Endpoint response did not match the JSON-RPC request
JSONRPC · 0.3.0
https://screwtape.ai/a2a
A2A response not confirmed · 28 Oct 2026, 15:06 UTC
Endpoint response did not match the JSON-RPC request

Up to three supported interfaces are checked per cycle. Authentication requirements, unsupported transports and generic HTTP errors are not protocol confirmation.

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Publisher-authorized synthetic tests

Publisher: set up test evidence →

No current fixture result · Not yet checked

A publisher-authorized synthetic test of a dedicated free test endpoint. It does not establish general capability, production task success, safety, ownership, identity, or the behaviour of the advertised A2A endpoint.

Consent: not confirmed.

Recent fixture observations

No fixture tests recorded.

Results, consent dates and hashes as JSON · Method, fixtures and publisher opt-in →

Recent card checks

Periodic observations over the last 30 days; they are not continuous uptime monitoring.

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Passed · 28 Oct 2026, 15:06 UTC
Agent Card unchanged; conditional HTTP 304 validated

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README Markdown:

[![LocalMark status](https://localmark.ai/badge/499066.svg)](https://localmark.ai/agents/499066)

Card-declared connections

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No card-declared connections recorded yet.

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Declared skills 5

Check an invoice for duplicates before the agent pays
Duplicate invoice check before an agent pays, with a signed receipt. Compares the invoice with the ones this API key recorded earlier and judges it like judge. Input: POST /v1/duplicate, the MCP tool check_duplicate_invoice, or A2A message/send with a data part, sending task, agent_output (the invoice JSON) and duplicate {vendor_path, invoice_id_path, amount_path, currency_path?, date_path?, window_days?, store?}. Output: the judge result plus duplicate.status (unique, duplicate, possible_duplicate, replay or not_checked). Needs Authorization: Bearer, because fingerprints are kept per key; only keyed HMAC fingerprints are stored, and only when store is true. Cost: same as judge.
invoicesduplicatespaymentsvalidation
False-consensus check across 2 to 16 agent answers
False-consensus check: scores agreement across 2 to 16 answers to one task and flags agreement that looks copied or thin. Use it before accepting a majority vote. Not for a single answer, and not proof of correctness: verify consensus_answer with judge. Input: POST /v1/consensus, or MCP tool consensus, with task and answers[{agent_id?, output}]. Output: consensus_answer, agreement_score, false_consensus_risk (low, medium or high), reasons, clusters, engine, request_id. Cost: same as judge, on Base or Solana.
consensusfalse-consensusx402
Get a free API key (proof of work, no human approval)
Creates a free key (10 calls per UTC day). Use it only when no key exists and you can compute SHA-256 in code. Input: POST /v1/signup, or MCP tool get_api_key, with pow_nonce (SHA-256 of screwtape-signup-v1:<UTC YYYY-MM-DD>:<nonce> must start with 12 zero bits; nonce matches ^[A-Za-z0-9_-]{8,64}$), plus optional email and name (at most 80 characters). Output: api_key (shown once), key metadata, request_id. Limits: 5 keys per IP per hour and per UTC day. Free.
signupapi-key
Judge one agent output (pass, fail or retry)
Independent pass/fail/retry verdict on one agent output, checked against the evidence and criteria you send. Use it before returning or acting on a draft. Not for web lookup or for comparing several answers (use consensus). Input: POST /v1/judge, the MCP tool judge, or A2A message/send, with task and agent_output plus optional evidence[], criteria[] and retain. Output: verdict, score 0 to 1, reasons, engine, request_id, retention. Cost: free key (10 calls per UTC day) or $0.005 USDC per call via x402 on Base or Solana.
judgevalidationverdictx402
Publish one signed receipt as a Screwtape Verified badge
Publish a receipt you own so a public page and badge link to that one verdict. It states that this output got this verdict at this time; it is not a general certification of the agent. Input: receipt_id, optional include_content, label, unpublish. Output: public_url, badge_svg_url, embed_html, embed_markdown. Needs the Bearer key that owns the receipt; no x402. Free. Available on MCP and REST.
receiptbadgeverification