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agent402.tools B20 Token Verifier
x402
agent402.tools B20 Token Verifier is a paid API for AI agents from agent402.tools, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).
Validates whether a given Base address is a genuine factory-issued B20 token by checking the 0xB200 prefix, ERC-20 readability, and registry feature activation
Price / call$0.005
Success—
StatusUnknown
How this service works
Boolean verdict with reasons: is this address a real factory-issued B20 on Base? Checks the 0xB200 address prefix, ERC-20 readability, and whether the B20 feature set is activated on the registry. ?address=0x…
Output
A boolean verdict indicating whether the address is a genuine factory-issued B20 token on Base, accompanied by specific reasons explaining the result — covering the 0xB200 address prefix check, ERC-20 readability, and whether the B20 feature set is activated on the registry.
Example use cases
Example prompt
“Can you check if 0xB200a3925C282E21C3Ef7b6b700c6f2e19d5c9f3 is a real factory-issued B20 token on Base — I want to know if it has the right prefix, is readable as an ERC-20, and has its B20 features activated in the registry?”
Technical details
Endpoint
GEThttps://agent402.tools/api/b20-verifyWhen to prefer
Use this endpoint when you need to cryptographically and programmatically confirm that a specific Base contract address is a legitimate factory-issued B20 token — especially before integrating, trading, or interacting with an unknown token. Prefer this over manual inspection when you need a structured boolean verdict with specific failure reasons across all three validation axes: address prefix, ERC-20 interface, and registry activation.
Side effects
- Missing or malformed address parameter returns an error
- Address that is not on Base network may fail registry lookup
- Non-contract addresses (EOAs) will fail ERC-20 readability check
- Network connectivity issues to Base RPC may cause lookup failures
- Payment failure (insufficient USDC balance) blocks the call
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"isB20": false,
"checks": {
"prefixMatch": false,
"erc20Readable": true,
"registryActivated": false
},
"address": "0x8335…2913"
}
}Tags
x402
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