# Polygon Token Balance Delta Analyzer

> Polygon Token Balance Delta Analyzer is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Analyzes caller-supplied evidence to compute token balance changes (deltas) between snapshots on the Polygon PoS network

## Facts

- Endpoint: POST https://signalharness.ai/api/agent/services/polygon_token_balance_delta/invoke
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/polygon-token-balance-delta-analyzer-f6776daf
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Rxc7Ji63paJQP__kKYPIt

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 polygon-token-balance-delta-analyzer-f6776daf -d '<json body>'
```

Example prompt: Using the Polygon token balance delta service, analyze these two balance snapshots for wallet 0x000...001 and tell me how much the token balance changed — here's the before/after evidence JSON.

## When to prefer this

Use this endpoint when you need to compute token balance deltas on Polygon PoS from caller-supplied snapshot evidence, especially when you cannot or do not want to query the chain directly. Ideal for audit trails, trade settlement verification, or compliance checks where the evidence is already in hand. Prefer over direct RPC calls when working in an agent pipeline that needs deterministic, pay-per-call micro-priced analysis without managing Polygon node access.

## Known failure modes

- Stale or incomplete snapshots — warnings returned when evidence may not reflect current chain state
- Invalid or malformed request_json — request rejected with error
- Unsupported chain ID in supplied evidence — analysis may be incomplete
- Missing before or after snapshot data — delta cannot be computed

## 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 analysis containing an array of balance changes per wallet-token pair, each with before/after balances and the computed delta, plus network context including accepted chain IDs (137 for mainnet, 80002 for Amoy testnet), the bridge model, completion policy, and protocol family. Also includes evidence scope, analyzed network identifier, and a status field indicating success.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "replay": false,
  "result": {
   "warnings": [
    "Snapshots may be stale or incomplete."
   ],
   "service_id": "polygon_token_balance_delta",
   "analysis_json": "{\"changes\":[{\"after\":\"2\",\"before\":\"1\",\"delta\":\"1\",\"key\":\"0x0000000000000000000000000000000000000001|0x0000000000000000000000000000000000000002\"}],\"network_context\":{\"accepted_chain_ids\":[\"137\",\"80002\"],\"bridge_model\":\"root-child state sync plus checkpoint evidence\",\"completion_policy\":\"never inferred without supplied evidence\",\"protocol_family\":\"Polygon PoS\"}}",
   "evidence_scope": "caller_supplied_data",
   "analyzed_network": "polygon"
  },
  "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": "polygon_token_balance_delta",
   "executionId": "example-execution",
   "startedAtMs": 0,
   "amountAtomic": "10000",
   "resultSha256": "c3a7b02250bd438b26d1a52fb785f53279bd55221fdb9e4f7edd0f6b28436eb5",
   "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/polygon-token-balance-delta-analyzer-f6776daf/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)