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SignalHarness Crosschain Event Timeline
x402
SignalHarness Crosschain Event Timeline is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.025/call, status unknown (last checked 2026-09-15).
Sorts and analyzes a caller-supplied list of blockchain events across multiple chains (Solana, Base, Polygon) into a unified, ordered timeline, detecting ordering ambiguities.
Price / call$0.025
Success—
StatusUnknown
How this service works
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Output
Returns a JSON analysis including a sorted array of events tagged by chain, block number, transaction index, and log index; an ambiguous_order boolean flag; the total event count; the set of analyzed networks; and any warnings (e.g. that clock and ordering evidence are caller-supplied). The result is wrapped in a standard SignalHarness receipt with payment and execution metadata.
Example use cases
DeFi bridge sequence verification
“I have a set of events from a token bridge — some on Polygon, some on Base — and I need to confirm they happened in the right order and flag any that are ambiguous. Here's the raw event list as JSON, can you run it through the crosschain timeline analyzer?”
Multichain wallet activity reconstruction
“Can you take these transaction events from Solana and Base for wallet address 0xABC...123 and reconstruct them into one chronological timeline? I want to see if there are any ordering gaps or conflicts across the two chains.”
Smart contract crosschain audit
“I'm auditing a smart contract that emits events on both Base and Polygon. Here's a JSON array of 12 events with their block numbers, transaction indexes, and log indexes — please sort them into a unified timeline and tell me if any ordering is ambiguous.”
Technical details
Endpoint
POSThttps://signalharness.ai/api/agent/services/crosschain_event_timeline/invokeWhen to prefer
Use this endpoint when you have a caller-supplied set of raw blockchain events spanning multiple chains (Solana, Base, Polygon) and need them sorted, deduplicated, and analyzed for ordering ambiguity in a single API call. It is particularly useful for DeFi audits, bridge transaction verification, and multichain wallet reconstruction where you already hold the raw event data and need structured ordering analysis without querying a node directly.
Side effects
- Malformed or non-JSON input in request_json returns a parse error
- Events with missing required fields (chain, block_number) may cause incomplete analysis
- Caller-supplied timestamps are not independently verified — ordering may be incorrect if input data is wrong
- Unsupported chain identifiers may be ignored or cause warnings
- Exceeding the 65536-character input limit results in rejection
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| request_json | string |
Output
Schema · Response
{
"type": "json",
"example": {
"replay": false,
"result": {
"warnings": [
"Clock and ordering evidence are caller supplied."
],
"service_id": "crosschain_event_timeline",
"analysis_json": "{\"ambiguous_order\":false,\"count\":1,\"events\":[{\"_source_index\":0,\"address\":\"0x0000000000000000000000000000000000000001\",\"block_number\":1,\"chain\":\"solana\",\"log_index\":0,\"transaction_index\":0}]}",
"evidence_scope": "caller_supplied_data",
"analyzed_network": "solana_base_polygon"
},
"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": "crosschain_event_timeline",
"executionId": "example-execution",
"startedAtMs": 0,
"amountAtomic": "25000",
"resultSha256": "ecd612d299676c91bf94d60fbc1299d5ff24af4493da4d6cbaf86cfbeb0f9ca5",
"serviceVersion": "1.0.0",
"settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"artifacts": [],
"requestId": "example-request",
"executionId": "example-execution"
}
}Tags
x402
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