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Base ERC-721 Transfer Analyze
x402
Base ERC-721 Transfer Analyze 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).
Analyzes ERC-721 NFT transfer data on Base network, parsing transfer events to identify token IDs, from/to addresses, amounts, and potential duplicate positions.
Price / call$0.01
Success—
StatusUnknown
How this service works
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Output
Returns a structured analysis JSON containing the ERC-721 standard type, total units transferred, a list of transfer objects (each with from/to addresses, token ID, amount, operator, log index, and transaction hash), duplicate positions detected, and network context (accepted chain IDs, fee model, deposit transaction type, protocol family). Also includes evidence scope and analyzed network name, plus warnings about data limitations (e.g., does not prove current ownership).
Example use cases
NFT provenance audit for marketplace
“I have a JSON blob of ERC-721 transfer events from Base — can you parse through them and tell me all the from/to addresses, token IDs, and flag any duplicate token positions?”
Verifying NFT delivery after mint
“I just sent an NFT on Base and want to confirm the transfer details — here's the transfer data in JSON, can you extract the token ID and confirm who it was sent to?”
Detecting suspicious duplicate NFT positions
“Can you analyze this ERC-721 transfer log from the Base network and let me know if there are any duplicate positions or anything unusual about the token movement?”
Technical details
Endpoint
POSThttps://signalharness.ai/api/agent/services/base_erc721_transfer_analyze/invokeWhen to prefer
Use this endpoint when you need to parse and analyze ERC-721 NFT transfer events specifically on the Base (OP Stack) network. It is purpose-built for Base/Base Sepolia chain IDs and understands the OP Stack fee model and transaction types. Prefer it over generic blockchain explorers when you need structured JSON output of transfer details including duplicate position detection, and when you have raw transfer data available as JSON to submit directly.
Side effects
- Invalid or malformed request_json causes parsing failure
- JSON input exceeds 65536 character limit
- Non-ERC-721 transfer data passed in produces incorrect or empty analysis
- Missing required transfer fields in input JSON lead to null values in output
- Unsupported chain ID data in input may not match accepted Base chain IDs
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| request_json | string |
Output
Schema · Response
{
"type": "json",
"example": {
"replay": false,
"result": {
"warnings": [
"Does not prove current ownership or completeness."
],
"service_id": "base_erc721_transfer_analyze",
"analysis_json": "{\"duplicate_positions\":[],\"network_context\":{\"accepted_chain_ids\":[\"8453\",\"84532\"],\"deposit_transaction_type\":\"0x7e\",\"fee_model\":\"L2 execution plus caller-supplied L1 data/operator components\",\"protocol_family\":\"OP Stack\"},\"standard\":\"ERC-721\",\"total_units\":\"1\",\"transfers\":[{\"amount\":\"1\",\"from\":\"0x0000000000000000000000000000000000000001\",\"index\":0,\"log_index\":null,\"operator\":null,\"to\":\"0x0000000000000000000000000000000000000002\",\"token\":null,\"token_id\":\"0\",\"transaction_hash\":null}]}",
"evidence_scope": "caller_supplied_data",
"analyzed_network": "base"
},
"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": "base_erc721_transfer_analyze",
"executionId": "example-execution",
"startedAtMs": 0,
"amountAtomic": "10000",
"resultSha256": "dd5de61b9ae27397b1e7bc0ba5d2c10da4dd96d57ef98014c4aad1372218ea71",
"serviceVersion": "1.0.0",
"settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"artifacts": [],
"requestId": "example-request",
"executionId": "example-execution"
}
}Tags
x402
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