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base-tx-explain
x402
base-tx-explain is a paid API for AI agents from base-tx-explain.fly.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).
Decodes any Base mainnet transaction into a plain-English JSON summary with action type, assets moved, labeled counterparties, risk flags, and gas cost in USD
Price / call$0.02
Success—
StatusUnknown
How this service works
Plain-English, deterministic decode of any Base mainnet transaction. Strict JSON: summary, action type, assets moved, labeled counterparties, risk flags, gas in USD. No LLM in the response path.
Output
A strict JSON object containing: a plain-English summary of the transaction, the action type (e.g. swap, transfer, mint), a list of assets moved with amounts and directions, labeled counterparties (e.g. known contracts or wallets), risk flags (e.g. interaction with flagged contracts), and the gas fee expressed in USD. The decode is deterministic — no LLM is used in the response path.
Example use cases
Wallet transaction history explainer
“I just got a notification about a transaction on my Base wallet. Can you decode this tx hash and tell me in plain English what happened, what tokens moved, and if there are any risk flags I should know about?”
DeFi trade audit for compliance
“We need to audit this Base mainnet transaction for a compliance report — please decode it and give me the action type, all assets moved, labeled counterparties, and the gas cost in USD.”
Suspicious transaction investigation
“Someone sent me this Base transaction hash and I want to know if it looks risky — can you decode it and flag anything suspicious, like unusual counterparties or unexpected asset transfers?”
Technical details
Endpoint
POSThttps://base-tx-explain.fly.dev/mcpWhen to prefer
Choose this endpoint when you need a fast, deterministic, structured decode of a Base mainnet transaction — especially when auditability or reproducibility matters and you cannot tolerate LLM-introduced variability. Ideal for compliance workflows, wallet UX enrichment, or agent pipelines that need to act on structured transaction data. Prefer this over general-purpose LLM-based blockchain explainers when consistency and strict JSON output are required.
Side effects
- Invalid or non-existent transaction hash returns an error
- Transaction not found on Base mainnet (e.g. it's on a different chain) returns an error
- Malformed MCP input schema causes a 400-level rejection
- Payment not included or insufficient USDC triggers a 402 response
- Unrecognized contract addresses may result in unlabeled counterparties
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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