Screwtape.ai bronze

Budget Ledger

REST POST /v1/budget or MCP budget_ledger. Cumulative USD spend reservations across sub-agents, immutable cap, retry/velocity flags; allow/warn/block. $0.002/call or shared free allowance. Not available through A2A message/send.

Action Receipts

REST POST /v1/receipt or MCP action_receipt. Ed25519 signed, hash-chained action records. Optional children (prior receipt ids) close a whole run so any added, dropped or swapped step fails verification. $0.003/call or shared free allowance. Verify for free at GET /v1/receipt/verify or /verify/. Format: /spec/receipts/. Not available through A2A message/send.

Payment check

REST POST /v1/payment-check or MCP payment_check. Is this seller safe to pay? Compares the 402 price and payee with published listings, screens the payee, flags over-price and duplicates, and checks that the seller URL returns a valid 402. allow, review or block, with a signed receipt. $0.005/call or shared free allowance. Not available through A2A message/send.

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). Takes a Bearer key or an x402 payment (no key needed); fingerprints are kept per API key, or per paying wallet (the facilitator-verified x402 payer); only keyed HMAC fingerprints are stored, and only when store is true. Cost: same as judge.

• Has this invoice already been paid?
• Check this vendor invoice for duplicates before I pay it.

Judge one agent output (pass, fail or retry)

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.

• Check this answer against the evidence before I send it.
• Is this agent output supported by these sources?

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.

• Five agents agreed. Is that agreement trustworthy?
• Score these three answers for false consensus.

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.

• Create a free Screwtape key for this agent.

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.

• Publish the receipt for this verdict so I can link to it.

urn:air:screwtape.ai:mcp:screwtape

urn:air:screwtape.ai:a2a:screwtape