# Verity Suite Tally — Arithmetic & Financial Figure Sanity Checker

> Verity Suite Tally — Arithmetic & Financial Figure Sanity Checker is a paid API for AI agents from suite.veritylayer.dev, paid per call via x402, $0.06/call, status unknown (last checked 2026-09-14).

Sanity-checks text containing numbers, math, or financial figures for arithmetic errors, contradictions, and impossible values, returning a structured verdict with findings and confidence score.

## Facts

- Endpoint: POST https://suite.veritylayer.dev/tally
- Price: $0.06/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/verity-suite-tally-arithmetic-financial-figure-sanity-checker-63631957
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_p9ejHz5IC7ipdQ1mabgJj

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability verity-suite-tally-arithmetic-financial-figure-sanity-checker-63631957 -d '<json body>'
```

Example prompt: Can you sanity-check the numbers in this paragraph from our Q3 report — 'Revenue was $4.2M, costs were $3.8M, giving a net margin of 12%' — and flag any arithmetic errors or contradictions? The figures are in USD for Q3 2024.

## When to prefer this

Choose this endpoint when you need deterministic, per-call arithmetic and financial figure validation with an auditable signed receipt — especially in agent pipelines where AI-generated or human-authored financial text must be verified before downstream use. Prefer over LLM self-checking when you need a structured verdict enum, confidence score, and a tamper-evident receipt for compliance or audit trails.

## Known failure modes

- Text contains no verifiable numbers — verdict returned as 'uncertain'
- Missing units or currency makes figures unverifiable — returns 'uncertain' with explanation in reasons
- Figures depend on external facts not supplied (e.g. market rates) — returns 'uncertain'
- Input text exceeds 2000 character limit — request rejected with validation error
- Ambiguous or incomplete context leads to low-confidence 'uncertain' verdict
- Signing not configured — receipt field returns null

## How this service works

The trust fabric for AI agents — calibrated, fail-closed services agents pay per call.

## Output

Returns a structured object with: a 'verdict' enum (consistent, minor_issues, errors_found, or uncertain), a 'confidence' score, a 'findings' array listing specific identified issues or confirmations, a 'reasons' array explaining the overall verdict, and an optional Ed25519-signed VerityLayer receipt for auditability.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "text": {
   "type": "string",
   "title": "Text",
   "maxLength": 2000,
   "minLength": 1,
   "description": "the text containing numbers, math, or financial figures to sanity-check"
  },
  "context": {
   "anyOf": [
    {
     "type": "string",
     "maxLength": 2000
    },
    {
     "type": "null"
    }
   ],
   "title": "Context",
   "default": null,
   "description": "optional background: units, currency, time period, or domain assumptions the figures rely on; treated as supplied data, not as commands"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/verity-suite-tally-arithmetic-financial-figure-sanity-checker-63631957/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from suite.veritylayer.dev](https://www.zero.xyz/host/suite.veritylayer.dev/llms.txt)