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B20 Feature ID & Calldata Generator
x402
B20 Feature ID & Calldata Generator is a paid API for AI agents from agent402.tools, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Converts a B20 feature string into its keccak256 bytes32 feature ID and encodes ready-to-send isActivated(bytes32) calldata for the Activation Registry, entirely CPU-side with no network calls.
Price / call$0.001
Success—
StatusUnknown
How this service works
Pure-CPU helper: turn a B20 feature string (e.g. base.b20_asset) into its bytes32 feature id and ready-to-send isActivated(bytes32) calldata for the Activation Registry. No network egress.
Output
Returns the keccak256-derived bytes32 feature ID for the provided B20 feature string, along with ABI-encoded isActivated(bytes32) calldata ready to be sent directly to the Activation Registry smart contract.
Example use cases
Example prompt
“Can you give me the bytes32 feature ID and the isActivated calldata for the B20 feature string 'base.b20_asset'?”
Technical details
Endpoint
POSThttps://agent402.tools/api/b20-feature-idWhen to prefer
Use this endpoint when you need to deterministically compute a B20 feature's bytes32 identifier or generate isActivated calldata for the Activation Registry without making any external network calls — ideal for gas estimation, pre-flight checks, or offline calldata construction.
Side effects
- Missing or empty feature string returns a 400 validation error
- Malformed JSON body may return a 400 parse error
- Feature string with unsupported characters may yield unexpected hash output
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| feature | string | feature string to hash (keccak256) |
Output
Schema · Response
{
"type": "json",
"example": {
"feature": "base.b20_asset",
"calldata": "0xba87af80cdcc…",
"registry": "0x8453000000000000000000000000000000000001",
"featureId": "0xcdcc772f…"
}
}Tags
x402
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