the402 endpoint detail

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api.sandbox.brickken.com agent set-uri

https://api.sandbox.brickken.com/x402/agent/set-uri

answers 402

Prepare ERC-8004 agent URI update. Prepare an unsigned transaction that publishes the final ERC-8004 agent URI and profile metadata.

We sent a real POST request to this endpoint and it answered 402 with payment requirements we could parse.
Price
$0.005
Network
base-sepolia
Pay to
0x6b0173489007dE9E2e619eccd98E8fa9c610849a
Spec dialect
v2 (declares x402Version 2)
Transport
PAYMENT-REQUIRED header
HTTP method
POST
Response latency
782 ms
Payment options
1 usable of 1
Last checked
2026-09-06T01:19:05.751Z (2h ago)
Category
data

Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Fapi.sandbox.brickken.com%2Fx402%2Fagent%2Fset-uri"