Compute the 4-byte function/error selector and full keccak topic from a solidity...
https://api.x402node.dev/crypto/selectorOverview
Compute the 4-byte function/error selector and full keccak topic from a solidity signature, e.g. transfer(address,uint256). For decoding tx input prefixes and matching event topics. function selector, 4byte, method id, event topic, keccak signature
Protocol
x402
Price
—
Payment Asset
USD Coin
Payment Network
eip155:8453
Category
crypto/transactions
Provider
x402node
Source
bazaar
Indexed
2026-06-21 22:15:28
Health
Status
healthy
Latency (p50)
417ms
Uptime (30d)
100.0%
Reliability Score
95/100
Last Checked
2026-08-06 09:35:05
Last Healthy
2026-08-06 09:35:05
Consecutive Failures
0
x402 Payment Validation
Payment Requirements
Valid
Asset Verified
Known USDC
Facilitator
—
Recent Health Checks
| Time | Status | HTTP | Latency | Error |
|---|---|---|---|---|
| 2026-08-06 09:35:05 | healthy | 402 | 428ms | |
| 2026-08-06 05:16:17 | healthy | 402 | 418ms | |
| 2026-08-05 22:09:36 | healthy | 402 | 416ms | |
| 2026-08-05 16:33:16 | healthy | 402 | 142ms | |
| 2026-08-05 14:44:11 | healthy | 402 | 141ms | |
| 2026-08-05 07:41:00 | healthy | 402 | 434ms | |
| 2026-08-05 03:33:22 | healthy | 402 | 417ms | |
| 2026-08-04 22:52:19 | healthy | 402 | 420ms | |
| 2026-08-04 14:39:30 | healthy | 402 | 417ms | |
| 2026-08-04 11:37:31 | healthy | 402 | 413ms | |
| 2026-08-04 08:02:42 | healthy | 402 | 418ms | |
| 2026-08-04 02:32:09 | healthy | 402 | 425ms | |
| 2026-08-03 19:46:49 | healthy | 402 | 414ms | |
| 2026-08-03 16:58:26 | healthy | 402 | 414ms |