# SignalHarness Token Balance Changes Analysis

> SignalHarness Token Balance Changes Analysis is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).

Analyzes token balance changes from caller-supplied blockchain or financial data and returns structured findings with warnings.

## Facts

- Endpoint: POST https://signalharness.ai/api/agent/services/token_balance_changes/invoke
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/signalharness-token-balance-changes-analysis-954fdcf8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_jAb9Rao0IwY2a8GKd8g5_

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 signalharness-token-balance-changes-analysis-954fdcf8 -d '<json body>'
```

Example prompt: Can you analyze these token transaction records and tell me what the net balance changes are, flagging anything unusual: [paste transaction data here]?

## When to prefer this

Choose this endpoint when you have raw token transaction or balance data that you want analyzed for net changes, anomalies, or movement summaries — especially when you need a cryptographically receipted result (SHA-256 hash) for auditability. It is purpose-built for on-chain token balance change extraction at $0.01 per call, making it cost-effective for high-frequency agent pipelines on Base network.

## Known failure modes

- Input string too short (below 2 characters) or too long (above 65536 characters) returns validation error
- Malformed or unparseable token data may produce empty results with warnings
- Network or payment settlement failure returns status other than 'succeeded'
- Ambiguous or insufficient transaction data may yield low-confidence output with warnings populated

## How this service works

Explore 330 pay-per-call x402 API services and 27 agent-native digital products, with Base USDC pricing, secure Polar checkout, and free discovery.

## Output

Returns a JSON object containing a token_balance_changes field with the analysis result, a list of warnings for any data quality or anomaly issues, the evidence_scope indicating the data source was caller-supplied, and a full execution receipt including payment ID, latency, network (Base/eip155:8453), amount charged (10000 atomic USDC units = $0.01), and a SHA-256 hash of the result for verification.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "token_balance_changes_request": {
   "type": "string",
   "maxLength": 65536,
   "minLength": 2
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "replay": false,
  "result": {
   "warnings": [
    "Records must be complete for the requested comparison scope."
   ],
   "service_id": "token_balance_changes",
   "evidence_scope": "caller_supplied_data",
   "token_balance_changes": "{\"records\":[{\"account\":\"0x0000000000000000000000000000000000000001\",\"after_atomic\":\"8\",\"before_atomic\":\"5\",\"delta_atomic\":\"3\"}],\"total_delta_atomic\":\"3\"}"
  },
  "status": "succeeded",
  "receipt": {
   "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
   "usage": [],
   "status": "succeeded",
   "network": "eip155:8453",
   "artifacts": [],
   "endedAtMs": 0,
   "latencyMs": 0,
   "paymentId": "example-payment",
   "receiptId": "example-receipt",
   "requestId": "example-request",
   "serviceId": "token_balance_changes",
   "executionId": "example-execution",
   "startedAtMs": 0,
   "amountAtomic": "10000",
   "resultSha256": "9303f2a7ff85c07aa90686c37a68e488fe12b2a739d927b12df1e783e0561689",
   "serviceVersion": "1.0.0",
   "settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
  },
  "artifacts": [],
  "requestId": "example-request",
  "executionId": "example-execution"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/signalharness-token-balance-changes-analysis-954fdcf8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from signalharness.ai](https://www.zero.xyz/host/signalharness.ai/llms.txt)