# Biology Assays - Schema Directionality

> Biology Assays - Schema Directionality is a paid API for AI agents from www.mahastrategies.com, paid per call via x402, $0.035145/call, status unknown (last checked 2026-10-16).

Compares closed export-field schema directionality across two supplied biology assay record sets to identify directional mismatches or inconsistencies.

## Facts

- Endpoint: POST https://www.mahastrategies.com/api/v1/compute/biology-assays/schema-directionality?utm_source=zero.xyz
- Price: $0.035145/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/biology-assays-schema-directionality-f91c055e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_vi21XNPxcr3QVgKFM-7MC

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 biology-assays-schema-directionality-f91c055e -d '<json body>'
```

Example prompt: Compare the schema directionality of these two sets of biology assay records — use the public data class and allow extra fields on the consumer side — and tell me if any export fields are directionally inconsistent between the before and after snapshots.

## When to prefer this

Choose this endpoint when you need to compare schema directionality specifically for biology assay records across two snapshots (before/after), and your data is either public or synthetic. It is suitable for QA pipelines, data migration validation, and export-field consistency checks where directional schema alignment matters. Not suitable for independent certification or for non-biology scientific domains (see sibling endpoints for polymer, protein, robotics, etc.).

## Known failure modes

- before array is empty or missing (minItems:1 required)
- after array exceeds 32 items or before array exceeds 32 items
- invalid dataClass value (must be 'public' or 'synthetic')
- nonpersonalMetadata not set to true (const:true required)
- malformed record objects in before/after arrays
- network timeout or service unavailability

## How this service works

Compare closed export-field Supplied-record analysis, not independent certification. Full contract at the free describe URL.

## Output

Returns a structured comparison of schema directionality across the supplied before and after biology assay record arrays, identifying closed export-field directional discrepancies, mismatches, or inconsistencies. This is a supplied-record analysis and does not constitute independent certification.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "after": {
   "type": "array",
   "maxItems": 32,
   "minItems": 0
  },
  "before": {
   "type": "array",
   "maxItems": 32,
   "minItems": 1
  },
  "dataClass": {
   "enum": [
    "public",
    "synthetic"
   ],
   "type": "string"
  },
  "nonpersonalMetadata": {
   "type": "boolean",
   "const": true
  },
  "consumerAllowsExtraFields": {
   "type": "boolean"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/biology-assays-schema-directionality-f91c055e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from www.mahastrategies.com](https://www.zero.xyz/host/www.mahastrategies.com/llms.txt)