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SignalHarness Token Allowance Change Analyzer
x402
SignalHarness Token Allowance Change Analyzer is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-16).
Analyzes a token allowance change request and returns a structured assessment with warnings and evidence scope
Price / call$0.01
Success—
StatusUnknown
How this service works
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Output
Returns a JSON object containing: an allowance_change_analysis narrative, a list of warnings, an evidence_scope label ('caller_supplied_data'), replay status, and a full receipt with payment details, request/execution IDs, result hash, and settlement reference on the Base network.
Example use cases
DeFi protocol allowance safety check
“I'm about to approve a token allowance for a new DeFi protocol on Base — can you analyze this request and flag any warnings before I sign it? The request says: 'Aave V3 requests unlimited DAI spending approval from my wallet 0xabc123'”
Agent wallet allowance audit
“My autonomous trading agent just submitted an allowance change request — can you analyze it and tell me the evidence scope and any concerns? Here's the request: 'Agent requests 10,000 USDC allowance increase for DEX aggregator contract 0xdef456 on Base'”
Suspicious approval investigation
“Someone sent me a transaction to approve a token allowance and it feels off — can you run an analysis on this allowance change request and surface any warnings: 'Unknown contract 0x999 requesting max uint256 USDC allowance, claiming to be a bridge'?”
Technical details
Endpoint
POSThttps://signalharness.ai/api/agent/services/token_allowance_change/invokeWhen to prefer
Choose this endpoint when you need a quick, structured AI-powered analysis of a token allowance change request — especially in agentic or automated DeFi workflows where an agent must decide whether to proceed with or flag an on-chain approval. It is particularly useful when you want machine-readable warnings and an evidence scope label alongside the narrative analysis, and when operating on Base network with USDC micropayment billing via x402.
Side effects
- Input string too short (below 2 characters) or too long (above 65536 characters) causing validation failure
- Malformed or ambiguous allowance request text resulting in incomplete analysis
- Payment failure on the x402 protocol leading to unpaid/rejected call
- Network or service unavailability returning a non-succeeded status
- Insufficient context in the request causing vague or low-confidence analysis output
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| allowance_change_request | string |
Output
Schema · Response
{
"type": "json",
"example": {
"replay": false,
"result": {
"warnings": [
"Allowance records are caller supplied and may be stale."
],
"service_id": "token_allowance_change",
"evidence_scope": "caller_supplied_data",
"allowance_change_analysis": "{\"decreases\":0,\"increases\":1,\"records\":[{\"after_atomic\":\"2\",\"before_atomic\":\"1\",\"delta_atomic\":\"1\",\"direction\":\"increase\",\"owner\":\"0x0000000000000000000000000000000000000001\",\"spender\":\"0x0000000000000000000000000000000000000002\",\"unlimited_after\":false}],\"unlimited_after\":0}"
},
"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_allowance_change",
"executionId": "example-execution",
"startedAtMs": 0,
"amountAtomic": "10000",
"resultSha256": "faf38a66d32ed5da0dc78115ccd3495c6b37cf131d643f756e6fd3d86fd0397e",
"serviceVersion": "1.0.0",
"settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"artifacts": [],
"requestId": "example-request",
"executionId": "example-execution"
}
}Tags
x402
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