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SYNTHORA Transaction Intent Classifier
x402
SYNTHORA Transaction Intent Classifier is a paid API for AI agents from api.hergertsynthora.com, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-13).
Decodes the real intent of an on-chain Ethereum/Base transaction and returns an Ed25519-signed risk verdict (safe/review/suspicious/dangerous) flagging issues like unlimited approvals, opaque selectors, and reverted transactions.
Price / call$0.1
Success—
StatusUnknown
How this service works
Tx Intent Classifier: decodes the REAL intent of an on-chain transaction (Base/Ethereum) and returns an Ed25519-signed risk verdict (safe/review/suspicious/dangerous). Catches unlimited approvals, opaque selectors, value-to-contract, reverted tx. POST {"tx_hash":"0x..","chain":"base"} or {"to":"0x..","data":"0x.."}.
Output
A risk verdict label (safe, review, suspicious, or dangerous) accompanied by a decoded human-readable intent description of the transaction, specific risk flags detected (e.g. unlimited approval, opaque selector, value sent to contract, reverted tx), and an Ed25519 cryptographic signature authenticating the verdict.
Example use cases
Pre-signing wallet transaction audit
“Before I sign this transaction, can you tell me what it's actually doing and whether it's safe? The tx hash is 0xabc123... on Base — I'm especially worried about unlimited token approvals.”
Suspicious DeFi interaction review
“I got a transaction request from a DeFi app with calldata 0xdeadbeef... going to contract 0x1234... on Ethereum — can you decode what it's really trying to do and give me a risk verdict?”
Post-execution reverted transaction diagnosis
“A transaction I submitted on Base reverted — the hash is 0x9f8e7d... — can you analyze what the intent was and tell me if it looks like it was a malicious call or just a failed legitimate tx?”
Technical details
Endpoint
POSThttps://api.hergertsynthora.com/v1/txintentWhen to prefer
Choose this endpoint when you need a cryptographically signed, human-readable risk classification of a specific Ethereum or Base transaction before or after execution — especially when you need to detect unlimited token approvals, obfuscated calldata, unexpected ETH-to-contract transfers, or reverted malicious calls. Prefer this over generic ABI decoders when you need a clear safe/suspicious verdict with a verifiable signature rather than just raw decoded data.
Side effects
- Invalid or unrecognized tx_hash returns an error — transaction may not be indexed yet or may not exist on the specified chain
- Unsupported chain identifier causes a 400-level error
- Missing both tx_hash and to/data fields results in a validation error
- Highly obfuscated or novel contract interactions may result in a 'review' verdict rather than a definitive classification
- Payment failure (x402) blocks the call if USDC balance is insufficient
- Network latency from on-chain RPC lookups may cause timeouts for recently submitted transactions
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| to | string | |
| data | string | |
| chain | string | |
| tx_hash | string |
Tags
x402
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