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SignalHarness EVM Block Continuity
x402
SignalHarness EVM Block Continuity 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).
Analyzes EVM blockchain data to assess block continuity, detecting gaps or anomalies in block sequences from caller-supplied data.
Price / call$0.005
Success—
StatusUnknown
How this service works
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Output
Returns a JSON object containing a block_continuity field with the continuity assessment result, a list of warnings if anomalies are found, the evidence_scope indicating the data source analyzed, a replay flag, and a full receipt with payment ID, execution ID, latency metrics, result hash, and settlement reference for auditability.
Example use cases
Smart contract audit block verification
“I'm auditing a smart contract deployment and need to verify that the block history I have is continuous with no missing blocks — can you run a block continuity check on this EVM block data I've collected?”
Indexer integrity check
“Our EVM indexer pulled a range of blocks and I want to make sure there are no gaps before we process it further — can you check this block sequence for continuity issues?”
On-chain event replay validation
“Before I replay these on-chain events, I need to confirm the underlying block data is complete and continuous — please analyze this EVM block continuity payload and flag any warnings.”
Technical details
Endpoint
POSThttps://signalharness.ai/api/agent/services/evm_block_continuity/invokeWhen to prefer
Choose this endpoint when you need a dedicated, agent-native service to programmatically verify EVM block sequence continuity from caller-supplied data, especially in automated pipelines where auditability (receipt, result hash, settlement reference) matters. Prefer this over general-purpose blockchain explorers when you need a structured JSON response with explicit continuity verdict, warnings, and cryptographic receipt — particularly useful in smart contract audit workflows, indexer validation, and on-chain event replay verification.
Side effects
- Malformed or empty block_continuity_request string returns a validation error
- Block data outside supported EVM format may yield inconclusive or warning-heavy results
- Payment failure via x402 protocol results in 402 response before execution
- Request exceeding 65536 character limit is rejected
- Ambiguous or incomplete block data may return warnings without a definitive continuity verdict
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| block_continuity_request | string |
Output
Schema · Response
{
"type": "json",
"example": {
"replay": false,
"result": {
"warnings": [
"Continuity does not establish canonical-chain membership."
],
"service_id": "evm_block_continuity",
"evidence_scope": "caller_supplied_data",
"block_continuity": "{\"breaks\":[],\"checked_links\":1,\"continuous\":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": "evm_block_continuity",
"executionId": "example-execution",
"startedAtMs": 0,
"amountAtomic": "5000",
"resultSha256": "885982eac563ff6f6ff9af731f62d2f7dd18d68cb4af6dfe40b6c58f696911c3",
"serviceVersion": "1.0.0",
"settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"artifacts": [],
"requestId": "example-request",
"executionId": "example-execution"
}
}Tags
x402
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