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SignalHarness Market VWAP Calculator
x402
SignalHarness Market VWAP Calculator is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-13).
Computes the Volume-Weighted Average Price (VWAP) for a specified market instrument based on caller-supplied data
Price / call$0.005
Success—
StatusUnknown
How this service works
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Output
Returns a JSON object containing the computed VWAP calculation result, any data quality warnings, evidence scope label, service status, and a detailed receipt including payment ID, network, latency, and a SHA-256 hash of the result for verification.
Example use cases
Intraday VWAP benchmark for equities
“I've got a list of AAPL trades from today with prices and volumes — can you calculate the VWAP so I can see how our execution compared to the market benchmark?”
Crypto DeFi fair-value check
“Using the ETH/USDC trade data I'm providing, compute the VWAP for the last 4 hours so I can check if the current spot price is above or below fair value.”
Algorithmic order slippage analysis
“I need to evaluate slippage on my algo orders — calculate the VWAP from these filled trade records so I can compare it to my order entry prices.”
Technical details
Endpoint
POSThttps://signalharness.ai/api/agent/services/market_vwap/invokeWhen to prefer
Choose this endpoint when you need a verifiable, on-chain-receipted VWAP computation with cryptographic proof of the result (SHA-256 hash), especially in agent workflows that require auditability. Prefer it over ad-hoc calculations when operating in crypto-native or DeFi contexts where payment via USDC on Base is natural and a tamper-evident receipt is valuable.
Side effects
- Empty or malformed vwap_request string returns a validation error
- Request string below 2 characters or above 65536 characters is rejected
- Insufficient or inconsistent price-volume data may trigger warnings in the response
- Payment failure via x402 protocol results in 402 response before execution
- Malformed JSON in the request body causes a parse error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| vwap_request | string |
Output
Schema · Response
{
"type": "json",
"example": {
"replay": false,
"result": {
"warnings": [
"VWAP reflects only supplied data and volume."
],
"service_id": "market_vwap",
"evidence_scope": "caller_supplied_data",
"vwap_calculation": "{\"observation_count\":2,\"total_volume\":\"3\",\"vwap\":\"10.666666666666666666\"}"
},
"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": "market_vwap",
"executionId": "example-execution",
"startedAtMs": 0,
"amountAtomic": "5000",
"resultSha256": "6c9c86694a7b1b408445297678836ffae355c9a4c5ddb9b0894777409bfa08f4",
"serviceVersion": "1.0.0",
"settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"artifacts": [],
"requestId": "example-request",
"executionId": "example-execution"
}
}Tags
x402
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