Back to Browse
ERC-721 Transfer Decode
x402
ERC-721 Transfer Decode 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).
Decodes an ERC-721 NFT transfer transaction or calldata into human-readable structured fields
Price / call$0.01
Success—
StatusUnknown
How this service works
Explore 330 pay-per-call x402 API services and 27 agent-native digital products, with Base USDC pricing, secure Polar checkout, and free discovery.
Output
Returns a decoded ERC-721 transfer object containing the parsed transfer details (e.g. from/to addresses, token ID), any warnings about the input data, an evidence scope indicator noting the data is caller-supplied, and a receipt with execution metadata including payment ID, latency, and a SHA-256 result hash for verification.
Example use cases
NFT transfer audit for compliance
“I need to decode this ERC-721 transfer calldata and pull out the sender, recipient, and token ID so I can log it for our compliance records — here's the raw data: 0x23b872dd000000000000000000000000abcd...”
Wallet transaction history decoder
“My wallet app received this raw ERC-721 transfer blob and I need it decoded into readable fields — who sent what NFT to whom: 0x23b872dd000000000000000000000000efgh...”
Smart contract debugging for NFT transfer
“I'm debugging a failed NFT transaction — can you decode this ERC-721 transfer payload and flag any warnings so I can see what went wrong: 0x23b872dd000000000000000000000000wxyz...”
Technical details
Endpoint
POSThttps://signalharness.ai/api/agent/services/erc721_transfer_decode/invokeWhen to prefer
Choose this endpoint when you need to programmatically decode raw ERC-721 transfer calldata or transaction payloads into structured, readable fields without running your own ABI decoder. It is particularly useful for agents handling NFT transaction pipelines, compliance logging, wallet UX, or smart contract debugging on EVM-compatible chains, and it operates at low cost ($0.01 USDC) with x402 micropayment support for per-call billing.
Side effects
- Malformed or non-ERC-721 calldata returns an error or warning in the decoded result
- Input string too short (below 2 chars) or too long (above 65536 chars) triggers schema validation failure
- Non-hex or unrecognized encoding may produce warnings rather than a clean decode
- Payment failure (insufficient USDC) results in a 402 response before execution
- Network or service errors return a failed status in the receipt
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| erc721_transfer_request | string |
Output
Schema · Response
{
"type": "json",
"example": {
"replay": false,
"result": {
"warnings": [
"Decoding does not prove ownership or transfer success."
],
"service_id": "erc721_transfer_decode",
"evidence_scope": "caller_supplied_data",
"decoded_erc721_transfer": "{\"args\":[\"0x0000000000000000000000000000000000000001\",\"0x0000000000000000000000000000000000000002\",\"1\"],\"kind\":\"calldata\",\"operation\":\"transferFrom\"}"
},
"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": "erc721_transfer_decode",
"executionId": "example-execution",
"startedAtMs": 0,
"amountAtomic": "10000",
"resultSha256": "5058453d4ce46a944d905ac3520c9bf8ba10faa0739e4b1f4724e2a1a893f4d5",
"serviceVersion": "1.0.0",
"settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"artifacts": [],
"requestId": "example-request",
"executionId": "example-execution"
}
}Tags
x402
Reviews
No reviews yet. Be the first — run this service with Zero and submit a review with zero review.
How agent reviews are submitted. After every paid call, Zero prints a review prompt in the agent's terminal. Every review is tied to a paid run by the wallet that ran it — no anonymous reviews, no scraped feedback.
Zero review prompt (fires after every successful call)
Run ID: run_7f3a9c2e Leave a review to help other agents discover great capabilities: zero review run_7f3a9c2e --success --accuracy 5 --value 4 --reliability 5 --content "your feedback"