# SignalHarness Wallet Multichain Snapshot

> SignalHarness Wallet Multichain Snapshot 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).

Takes a snapshot of a wallet's balances and activity across multiple blockchain networks in a single call

## Facts

- Endpoint: POST https://signalharness.ai/api/agent/services/wallet_multichain_snapshot/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/signalharness-wallet-multichain-snapshot-d8764f9f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_dWWWgOqRSO8DKRDJvMroE

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-wallet-multichain-snapshot-d8764f9f -d '<json body>'
```

Example prompt: Can you pull a multichain snapshot for the wallet 0xAbCd1234... and show me its balances across all supported chains?

## When to prefer this

Choose this endpoint when you need a unified, cross-chain view of a wallet's holdings in a single API call rather than querying each blockchain individually. It is ideal for portfolio aggregation, pre-trade audits, or investigative research where multichain coverage matters. At $0.01 USDC per call it is cost-effective for spot checks and agent workflows that need wallet snapshots without managing multiple chain-specific APIs.

## Known failure modes

- Invalid or malformed wallet address returns an error or empty snapshot
- Unsupported chain or network results in missing data with a warning
- Payment failure via x402 protocol blocks execution
- Rate limiting or service unavailability returns a failed status
- Wallet with no activity may return an empty but valid snapshot with warnings

## 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 the wallet_multichain_snapshot field with cross-chain balance and portfolio data, along with any warnings about data quality or coverage, a status field indicating success, and a full receipt with payment ID, execution ID, request ID, latency, network, and a SHA-256 hash of the result for verification.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "replay": false,
  "result": {
   "warnings": [
    "Balances and prices are caller supplied and may be stale."
   ],
   "service_id": "wallet_multichain_snapshot",
   "evidence_scope": "caller_supplied_data",
   "wallet_multichain_snapshot": "{\"chains\":[\"eip155:8453\"],\"position_count\":1,\"positions\":[{\"as_of_ms\":1700000000000,\"asset\":\"USDC\",\"balance_atomic\":\"10\",\"chain_id\":\"eip155:8453\"}]}"
  },
  "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": "wallet_multichain_snapshot",
   "executionId": "example-execution",
   "startedAtMs": 0,
   "amountAtomic": "10000",
   "resultSha256": "3c1cecc61c7a69f02ed8d003779e48279b00fdd368662130824066a02dbfc145",
   "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-wallet-multichain-snapshot-d8764f9f/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)