$0.001
per call · USD Coin on Base
A payment integration check for 0.001 USDC, with no external data lookup. Returns time, transport rail, network mode and a catalogue of free and paid capabilities. HTTP payment options can include Base, Polygon, Arbitrum and XDC; the challenge lists currently available networks for each transport. The settlement receipt identifies the paid network and transaction.
Endpoint
GET https://api.402rates.com/v1/ping17
Calls / 30d
7
Unique payers / 30d
Sep 8
Last called
exact
Payment scheme
Call this service
import { wrapFetchWithPayment } from "@x402/fetch";
import { privateKeyToAccount } from "viem/accounts";
const account = privateKeyToAccount(process.env.PRIVATE_KEY);
const fetchWithPay = wrapFetchWithPayment(fetch, account);
const res = await fetchWithPay("https://api.402rates.com/v1/ping", {
method: "GET",
});
const data = await res.json();curl -X GET \
"https://api.402rates.com/v1/ping" \
-H "X-PAYMENT: <signed x402 payment>"Example response
{
"mode": "mainnet",
"next": {
"free": [
{
"capability": "compass.rwa.coverage",
"note": "What the RWA yield data covers, and what it does not",
"url": "https://api.402rates.com/v1/rwa/coverage"
},
{
"capability": "compass.rwa.filter",
"note": "Published instrument constraints compared with supplied facts",
"url": "https://api.402rates.com/v1/rwa/filter"
},
{
"capability": "compass.rwa.instrument",
"note": "Full evidence-backed state for one tokenized treasury",
"url": "https://api.402rates.com/v1/rwa/instrument"
},
{
"capability": "compass.rwa.history",
"note": "Normalized history for one reconstructible RWA source",
"url": "https://api.402rates.com/v1/rwa/history"
},
{
"capability": "compass.discovery",
"note": "Search the x402 catalogue with usage figures",
"url": "https://api.402rates.com/v1/discovery"
},
{
"capability": "compass.manifest",
"note": "Service manifest",
"url": "https://api.402rates.com/v1/manifest"
},
{
"capability": "compass.health",
"note": "Liveness probe",
"url": "https://api.402rates.com/health"
},
{
"capability": "compass.ready",
"note": "Readiness probe",
"url": "https://api.402rates.com/ready"
}
],
"mcp": "https://api.402rates.com/mcp",
"paid": [
{
"capability": "compass.settlement.costs",
"note": "Measured cost of a USDC transfer per chain, cheapest first",
"price_usdc": "0.01",
"url": "https://api.402rates.com/v1/settlement/costs"
},
{
"capability": "compass.rwa.yields",
"note": "Realised 30-day yields of tokenized treasuries, recomputable",
"price_usdc": "0.03",
"url": "https://api.402rates.com/v1/rwa/yields"
},
{
"capability": "compass.rwa.instruments.all",
"note": "Complete evidence snapshot for all tracked tokenized treasuries",
"price_usdc": "5",
"url": "https://api.402rates.com/v1/rwa/instruments"
},
{
"capability": "compass.ping",
"note": "Payment integration check",
"price_usdc": "0.001",
"url": "https://api.402rates.com/v1/ping"
}
]
},
"pong": true,
"rail": "cdp-v2",
"time": "2026-07-10T12:00:00Z"
}Payment details
0xf567cfe0fdb87a1d6ca330e3f30f0d3da0f7cb98USD Coin · 0x833589fcd6edb6e08f4c7c32d4f71b54bda02913Is this your API?
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402rates.com · Settlement Costs
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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.
402rates.com · RWA Yields
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