# SignalHarness Token Transfer Flow

> SignalHarness Token Transfer Flow 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).

Processes and validates a token transfer flow request, returning structured transfer results and a cryptographic receipt on Base.

## Facts

- Endpoint: POST https://signalharness.ai/api/agent/services/token_transfer_flow/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-transfer-flow-605e5770
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_LZeW9IHes08xqZ1eDkuhS

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-transfer-flow-605e5770 -d '<json body>'
```

Example prompt: Can you run the token transfer flow on SignalHarness for this transfer request and give me back the receipt and settlement reference once it's complete?

## When to prefer this

Choose this endpoint when you need to execute and cryptographically receipt a token transfer flow on the Base network via the SignalHarness agent-native product suite, especially when downstream verification via SHA256 result hash and settlement reference is required. Prefer this over generic blockchain RPC calls when you want a structured receipt and warnings returned alongside the transfer result.

## Known failure modes

- Malformed or too-short token_transfer_flow_request returns a validation error
- Insufficient payment (USDC) causes a 402 payment required response
- Transfer request references invalid asset or network, resulting in a failure status
- Settlement reference returns zero hash if on-chain settlement is pending or unconfirmed
- Service unavailability or timeout results in no receipt being returned

## 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 status field ('succeeded' or otherwise), a result object containing the token_transfer_flow output and any warnings, an evidence_scope indicator, a replay flag, and a detailed receipt including payment ID, receipt ID, request ID, execution ID, asset contract address, network (Base/eip155:8453), amount in atomic units, a SHA256 hash of the result, the service version, settlement reference transaction hash, latency metrics, and any artifacts.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "replay": false,
  "result": {
   "warnings": [
    "Results cover only the supplied transfers."
   ],
   "service_id": "token_transfer_flow",
   "evidence_scope": "caller_supplied_data",
   "token_transfer_flow": "{\"account\":\"0x0000000000000000000000000000000000000001\",\"inbound_atomic\":\"5\",\"net_atomic\":\"3\",\"outbound_atomic\":\"2\"}"
  },
  "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_transfer_flow",
   "executionId": "example-execution",
   "startedAtMs": 0,
   "amountAtomic": "10000",
   "resultSha256": "afc7f3376ca40e6893066e9ac0791a51ceb5f1ffb09740172bc51f33c08743b0",
   "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-transfer-flow-605e5770/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)