# Token Assessment Evidence Coverage — Before and After Comparison

> Token Assessment Evidence Coverage — Before and After Comparison is a paid API for AI agents from market.datapackvibe.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-12).

Computes a before-and-after comparison of evidence coverage for token assessment observations, reporting how coverage changed between two snapshots.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-bx-token-evidence-coverage-compare?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/token-assessment-evidence-coverage-before-and-after-comparison-95f92dbc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_c7zzvx-aSTgUFCupjkU65

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 token-assessment-evidence-coverage-before-and-after-comparison-95f92dbc -d '<json body>'
```

Example prompt: Compare my token assessment evidence coverage — before I had 8 observed fields out of 10 requested, and after I have 8.8 observed out of 11 requested. Give me the before-and-after coverage report.

## When to prefer this

Choose this endpoint when you need a deterministic, low-cost ($0.01 USDC) point-in-time comparison of token evidence coverage between exactly two snapshots (before and after). Prefer it over live scanning or multi-period trend tools when you only have two observation sets and want a simple coverage delta report without live data fetching or trade signals.

## Known failure modes

- requested_fields must be greater than 0 (exclusiveMinimum) — zero value will cause validation error
- observed_fields or requested_fields missing from before or after object — returns schema validation error
- Non-numeric values for field counts — type error
- Coverage ratio exceeds 1.0 if observed_fields > requested_fields — endpoint accepts this but results may be unexpected
- Payment of 0.01 USDC not fulfilled — x402 payment required error

## How this service works

Token assessment evidence coverage — Before and after comparison: Before and after comparison for Token assessment evidence coverage. Supplied token observations only. Deterministic calculation or caller-threshold verdict, not a live scan, safety proof or trade recommendation. Specialised preset in a shared 50-profile, 20-operation engine. 0.01 USDC includes one bounded before and after comparison report.

## Output

A deterministic before-and-after coverage comparison report showing the observed-to-requested field ratios for both snapshots, the coverage percentage or score for each period, and the delta between them. No live scan or trade recommendation is included — results are based solely on the supplied token observation counts.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "after": {
   "type": "object",
   "default": {
    "observed_fields": 8.8,
    "requested_fields": 11
   },
   "required": [
    "observed_fields",
    "requested_fields"
   ],
   "properties": {
    "observed_fields": {
     "type": "number",
     "default": 8,
     "maximum": 10000000000000000,
     "minimum": 0
    },
    "requested_fields": {
     "type": "number",
     "default": 10,
     "maximum": 10000000000000000,
     "minimum": 0,
     "exclusiveMinimum": 0
    }
   },
   "additionalProperties": false
  },
  "before": {
   "type": "object",
   "default": {
    "observed_fields": 8,
    "requested_fields": 10
   },
   "required": [
    "observed_fields",
    "requested_fields"
   ],
   "properties": {
    "observed_fields": {
     "type": "number",
     "default": 8,
     "maximum": 10000000000000000,
     "minimum": 0
    },
    "requested_fields": {
     "type": "number",
     "default": 10,
     "maximum": 10000000000000000,
     "minimum": 0,
     "exclusiveMinimum": 0
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/token-assessment-evidence-coverage-before-and-after-comparison-95f92dbc/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from market.datapackvibe.com](https://www.zero.xyz/host/market.datapackvibe.com/llms.txt)