the402 endpoint detail

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yieldsignal.vercel.app capacity usdc-base-yield

https://yieldsignal.vercel.app/capacity/usdc-base-yield

answers 402

Exit capacity for USDC lending on Base: per-protocol utilization and withdrawable liquidity read from the protocol's own books (Aave, Compound), plus whether your size (?amountUsd=) can be withdrawn right now and what share of the market it would be. Protocols that do not expose borrowed-vs-supplied are marked unmeasured, never assumed liquid. Verified per-asset accuracy is free at /accuracy.json;

We sent a real GET request to this endpoint and it answered 402 with payment requirements we could parse.
Price
$0.25
Network
base
Pay to
0x561143BFE9E2D975D92e915B8EfFEAa54119472a
Spec dialect
v2 (declares x402Version 2)
Transport
PAYMENT-REQUIRED header
HTTP method
GET
Response latency
78 ms
Payment options
2 usable of 2
Last checked
2026-08-15T14:40:58.975Z (6d ago)
Category
finance-crypto

Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Fyieldsignal.vercel.app%2Fcapacity%2Fusdc-base-yield"