Ecosystem: add B20 Check (Services/Endpoints)#241
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Adds B20 Check to the ecosystem page under Services/Endpoints.
B20 Check returns signed legitimacy verdicts for B20 tokens on Base: retained issuer powers (mint / freeze / seize / pause / admin) and imposter detection, as a block-pinned EIP-712 attestation. Priced $0.01 per call via x402 (exact scheme, eip155:8453).
Live x402 endpoint (returns a v2 402 challenge):
curl -i https://b20check.com/v1/verify/0xb2000000000000000000001fd821494127f35af0
Listed in the CDP x402 Bazaar and on x402scan. First mainnet settlement:
0x682e3b913ce499c4fe95b323bb0455a1b1bf33ea8d367f9dba72b6bd65a053cb
Methodology and free demo: https://b20check.com/methodology