# SignalHarness Token Metadata Validate

> SignalHarness Token Metadata Validate is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).

Validates token metadata supplied by a caller and returns structured validation results with warnings

## Facts

- Endpoint: POST https://signalharness.ai/api/agent/services/token_metadata_validate/invoke
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/signalharness-token-metadata-validate-61bb3143
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_vxOVIuPVeHis0GxPCGl1L

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-metadata-validate-61bb3143 -d '<json body>'
```

Example prompt: Can you validate this token metadata string for me and tell me if there are any warnings or issues: '{"name":"MyToken","symbol":"MTK","decimals":18}'?

## When to prefer this

Choose this endpoint when you need a fast, paid, receipt-backed validation of token metadata strings with structured warnings and an audit trail. It is particularly useful in agent pipelines that require verifiable, tamper-evident validation (via SHA-256 result hash) and on-chain payment receipts on Base. Prefer this over manual parsing or free validators when auditability and agent-native payment flow (x402/USDC) are required.

## Known failure modes

- Input string is empty or below minimum length of 2 characters — request rejected
- Input string exceeds maxLength of 65536 characters — request rejected
- Malformed JSON in token_metadata_request field — validation may fail or return generic warnings
- Payment not provided or insufficient — 402 response, service not invoked
- Network or service downtime — no receipt returned, execution fails

## 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 validation status ('succeeded'), a result object with a 'token_metadata_validation' field summarizing the outcome, a list of 'warnings', the 'evidence_scope' (caller_supplied_data), and a full payment receipt including asset address, network, payment ID, amount, latency, and a SHA-256 hash of the result. The 'replay' flag indicates whether this was a cached response.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "replay": false,
  "result": {
   "warnings": [
    "Validation does not authenticate issuer metadata."
   ],
   "service_id": "token_metadata_validate",
   "evidence_scope": "caller_supplied_data",
   "token_metadata_validation": "{\"errors\":[],\"normalized\":{\"address\":\"0x0000000000000000000000000000000000000001\",\"decimals\":6,\"name\":\"Example\",\"symbol\":\"EX\"},\"valid\":true}"
  },
  "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_metadata_validate",
   "executionId": "example-execution",
   "startedAtMs": 0,
   "amountAtomic": "5000",
   "resultSha256": "8d6518d8672daa7c4a9b09aba2a8bcbcb15531b637a50967e499815e841aa5d1",
   "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-metadata-validate-61bb3143/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)