# SignalHarness Chain Identifier Normalize

> SignalHarness Chain Identifier Normalize is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-16).

Normalizes a blockchain chain identifier string into a canonical, standardized format with warnings about any ambiguities.

## Facts

- Endpoint: POST https://signalharness.ai/api/agent/services/chain_identifier_normalize/invoke
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/signalharness-chain-identifier-normalize-62fce6e3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_4CLFaaz7I2H5R4hdyjKHZ

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-chain-identifier-normalize-62fce6e3 -d '<json body>'
```

Example prompt: Can you normalize the chain identifier 'base mainnet' to its canonical standardized form so I can use it consistently across my cross-chain app?

## When to prefer this

Use this endpoint when you need to canonicalize, standardize, or validate a blockchain chain identifier from an arbitrary input format (human-readable names, EIP-155 URIs, CAIP-2 identifiers, informal aliases) into a consistent normalized form. Ideal for multi-chain applications, cross-chain workflows, or any agent system that receives chain references from heterogeneous sources and needs a single canonical representation.

## Known failure modes

- Input string too short (below 2 characters) or too long (above 65536 characters) returns a validation error
- Completely unrecognizable or nonsensical chain identifier strings may return a result with warnings but no confident normalization
- Network or payment failures may cause the request to fail with a non-success status
- Ambiguous identifiers shared across multiple chains may return a result with multiple 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 with a normalized_chain_identifier field (the canonicalized chain string), a warnings array (highlighting any ambiguities or issues found in the input), a service_id, and an evidence_scope field indicating the data source. Also includes a receipt with payment, execution, and network metadata.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "replay": false,
  "result": {
   "warnings": [
    "Syntax validation does not prove that a network is live or supported."
   ],
   "service_id": "chain_identifier_normalize",
   "evidence_scope": "caller_supplied_data",
   "normalized_chain_identifier": "{\"caip2\":\"eip155:8453\",\"namespace\":\"eip155\",\"reference\":\"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": "chain_identifier_normalize",
   "executionId": "example-execution",
   "startedAtMs": 0,
   "amountAtomic": "5000",
   "resultSha256": "2ba06956ecf012708d6e9bd69f353b3a26b607247602c7ffecc509d71f72be11",
   "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-chain-identifier-normalize-62fce6e3/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)