# Token Assessment Evidence Coverage — Sequential Input-Change Attribution

> Token Assessment Evidence Coverage — Sequential Input-Change Attribution 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 sequential input-change attribution report comparing before/after evidence coverage ratios for token assessment observed versus requested fields.

## Facts

- Endpoint: POST https://market.datapackvibe.com/x402/assistant-bx-token-evidence-coverage-waterfall?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-sequential-input-change-attribution-8043621e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7Qb5eL2jWnUO-KuLMsdVo

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-sequential-input-change-attribution-8043621e -d '<json body>'
```

Example prompt: Can you run a sequential input-change attribution for token evidence coverage — before the change I had 8 observed fields out of 10 requested, and after the change it's 8.8 observed out of 11 requested?

## When to prefer this

Choose this endpoint when you need a deterministic, cheap ($0.01 USDC) before/after comparison of token evidence coverage using the sequential waterfall attribution method. It is purpose-built for token assessment contexts where you have two snapshots of observed vs requested field counts and need an attributed delta report, rather than a live scan, a batch operation, or a trade signal.

## Known failure modes

- requested_fields cannot be zero or negative (exclusiveMinimum enforced) — will return validation error
- observed_fields exceeding maximum bound (1e16) will be rejected
- missing required 'before' or 'after' sub-objects will cause schema validation failure
- payment not included or underpaid will result in 402 Payment Required response
- malformed JSON body will return 400 Bad Request

## How this service works

Token assessment evidence coverage — Sequential input-change attribution: Sequential input-change attribution 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 sequential input-change attribution report.

## Output

A deterministic sequential input-change attribution report showing how evidence coverage (observed_fields / requested_fields ratio) changed between the before and after snapshots, including attributed delta values and a caller-threshold verdict. The report is bounded, not a live scan or trade recommendation.

## 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-sequential-input-change-attribution-8043621e/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)