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B20 Token Memo Decoder
x402
B20 Token Memo Decoder is a paid API for AI agents from agent402.tools, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).
Fetches and decodes payment memos attached to B20 token transfers, pairing each Memo log with its corresponding Transfer log by transaction hash or block window scan.
Price / call$0.005
Success—
StatusUnknown
How this service works
Payment memos attached to B20 transfers: pairs each Memo(address,bytes32) log with its Transfer at the previous log index (same tx, same token). Give a tx hash for one transaction, or scan a block window. Returns memoHex always and memoText when printable UTF-8. ?token=0xb200…&tx=0x…|&blocks=50000&address=0x…&limit=50
Output
Returns a list of memo records, each containing memoHex (always present), memoText (when parseable as UTF-8), paired Transfer log details (from/to addresses, amount), and the transaction hash — up to the specified limit (default 50).
Example use cases
Example prompt
“Show me all the payment memos from this B20 transfer transaction — the token address is 0xb200abc123... and the tx hash is 0xdeadbeef... — decode both the hex and the human-readable memo text.”
Technical details
Endpoint
GEThttps://agent402.tools/api/b20-memosWhen to prefer
Use this endpoint when you need to read structured memo data attached to B20 token transfers on-chain, either for a specific transaction or across a recent block window. It is the right choice when you want to decode both raw hex memos and human-readable text from B20 Memo logs paired with their Transfer events. Prefer this over generic blockchain explorers when you specifically need the memo-transfer pairing logic already handled.
Side effects
- Missing or invalid token address (must have 0xb200 prefix) — returns 400 error
- Invalid transaction hash format — returns 400 or empty results
- Transaction hash not found on-chain — returns empty memo list
- Block window exceeds 200000 blocks — returns 400 error
- No Memo logs found in the specified tx or block range — returns empty array
- Token address does not match B20 contract format — returns error or empty results
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"mode": "window",
"count": 0,
"memos": [],
"token": "0xb200…0001",
"toBlock": 2,
"fromBlock": 1,
"truncated": false,
"scannedFromBlock": 1
}
}Tags
x402
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