SMT Contract & Policy Logic Prover

$2.50 USDC per call · Developer and security · POST /api/v1/prove-contract-logic · Id smt-contract-prover

Answers a yes/no logic question about contract clauses, IAM/OPA policies or business rules with a solver-backed result and a plain-language headline and next step. Takes clauses or pasted text (or a formal IR directly with zero LLM calls), formalizes them into typed Boolean, integer and rational constraints, then answers "is P possible", "does invariant I always hold" or "are any clauses contradictory" with a pure-TypeScript CDCL(T) solver (exact rational simplex, branch-and-bound, minimal unsatisfiable cores). SAT returns an exact counterexample checked against every original constraint; UNSAT reports the proof statement and the minimal conflicting clause ids; exhausted budgets return UNKNOWN. Natural-language input uses two independent formalizations whose logical equivalence is checked by the solver; disagreements are reported with a distinguishing assignment and lower confidence. Formal elements whose source quote is not in the text are dropped. The proof is exact for the formalization, not for the original wording, and is not legal advice.

What you get

Finds the loophole, contradiction or privilege-escalation path in contract clauses, IAM/OPA policies and business rules with a solver, returning an exact counterexample or a minimal set of conflicting clauses instead of an opinion.

Call it

Send the JSON body below to https://agents.writerslogic.com/api/v1/prove-contract-logic. An unpaid request answers 402 with the price and how to pay; a request that fails with a 5xx status is not charged.

curl -i -X POST https://agents.writerslogic.com/api/v1/prove-contract-logic \
  -H 'content-type: application/json' \
  -d '{"clauses":[{"id":"C1","text":"Any payout request may be approved by a manager."},{"id":"C2","text":"Payouts above $10,000 require approval by a director."},{"id":"C3","text":"A manager is never a director."}],"query":"Can a payout above $10,000 be approved by a manager?"}'

Input

Field	Type	Required	Description
`clauses`	array<object>; max 200 items	no	Natural-language contract clauses, IAM/OPA policy statements or business rules, each with a caller-chosen id. Mutually exclusive with ir.
`text`	string; length 3..60000	no	Alternative to clauses: the contract, policy or rules pasted as plain text. It is split into clauses by blank lines and numbered or bulleted lines (ids C1.2 or S3). Use clauses when you need your own ids. Requires query.
`query`	string; length 1..1000	no	The question, e.g. "Can an unauthorized user ever approve a payout over $10,000?" or "Are any clauses mutually contradictory?". Required with clauses.
`ir`	object	no	Formal IR, solved with zero LLM calls: {variables:[{name,type:bool\|int\|real,min?,max?}], constraints:[{id,expr,source?}], query:{mode:possible\|always\|consistency,formula?,source?}}. Expressions are JSON ASTs: {op:"var",name}, {op:"num",value:"3/4"}, {op:"true"\|"false"}, and {op,args} for not, and, or, implies, iff, ite, =, !=, <, <=, >, >=, add, sub, neg, mul (one side constant). Numbers are exact strings.
`budget`	object	no	Optional lower step budgets.

Example request body

{
  "clauses": [
    {
      "id": "C1",
      "text": "Any payout request may be approved by a manager."
    },
    {
      "id": "C2",
      "text": "Payouts above $10,000 require approval by a director."
    },
    {
      "id": "C3",
      "text": "A manager is never a director."
    }
  ],
  "query": "Can a payout above $10,000 be approved by a manager?"
}

Result

The response is { "data": ..., "_provenance": ... }. data carries these fields; _provenance is a signed W3C Verifiable Credential with a C2PA-style manifest, checked free at POST /api/v1/verify-provenance.

Field	Type	Required	Description
`deterministic`	boolean	yes	True when no LLM touched the verdict path (formal IR input).
`headline`	string	yes	The answer in one or two sentences, rendered from the solver result (witness values or conflicting clause ids).
`nextStep`	string	yes	What to do with this result.
`status`	string; one of "SAT", "UNSAT", "UNKNOWN"	yes
`verdict`	string; one of "POSSIBLE", "IMPOSSIBLE", "INVARIANT_VIOLATED", "INVARIANT_PROVED", "CONSISTENT", "INCONSISTENT", "UNKNOWN", "TRANSLATION_DISAGREEMENT"	yes
`mode`	string; one of "possible", "always", "consistency"	yes
`confidence`	string; one of "high", "medium", "low"	yes
`result`	object	yes
`translation`	object	no
`audit`	object	yes

Pay and connect

Available through: x402 (USDC on Base), MCP, RapidAPI, Apify.

Machine-readable

This agent as JSON (schemas, example, OpenAPI operation)
Free signed sample response
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