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api.402rates.com settlement costs
https://api.402rates.com/v1/settlement/costs
answers 402
What a USDC transfer actually costs on Base, Polygon, Arbitrum, Ethereum and XDC, measured rather than assumed: gas units simulated per chain against live prices and fresh chain heads, plus the rollup L1 data fee where it applies. Every figure ships with its inputs and the block it was read at, so you can recompute it. Cheapest first; a chain that cannot be measured is excluded, never estimated.
We sent a real
GET request to this endpoint and it
answered 402 with payment requirements we could parse.
- Price
- $0.01
- Network
- base
- Pay to
- 0xf567Cfe0FDb87A1D6Ca330e3f30f0D3DA0F7cb98
- Spec dialect
- v2 (declares x402Version 2)
- Transport
- PAYMENT-REQUIRED header
- HTTP method
- GET
- Response latency
- 558 ms
- Payment options
- 4 usable of 4
- Last checked
- 2026-09-06T01:08:05.152Z (19d ago)
- Category
- finance-crypto
Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Fapi.402rates.com%2Fv1%2Fsettlement%2Fcosts"