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)
432ms
Uptime (30d)
100.0%
Reliability Score
95/100
Last Checked
2026-09-20 18:39:42
Last Healthy
2026-09-20 18:39:42
Consecutive Failures
0
x402 Payment Validation
Payment Requirements
Valid
Asset Verified
Known USDC
Facilitator
—
Recent Health Checks
| Time | Status | HTTP | Latency | Error |
|---|---|---|---|---|
| 2026-09-20 18:39:42 | healthy | 402 | 437ms | |
| 2026-09-20 12:17:46 | healthy | 402 | 432ms | |
| 2026-09-20 05:37:14 | healthy | 402 | 436ms | |
| 2026-09-19 21:07:34 | healthy | 402 | 147ms | |
| 2026-09-19 08:08:13 | healthy | 402 | 434ms | |
| 2026-09-19 02:49:36 | healthy | 402 | 428ms | |
| 2026-09-18 18:54:03 | healthy | 402 | 960ms | |
| 2026-09-18 08:22:21 | healthy | 402 | 424ms |