Beauty & Personal Care · x402 · early usage

Stablecoin peg check: price vs USD, deviation in basis points and peg status for USDC,…

Stablecoin peg check: price vs USD, deviation in basis points and peg status for USDC, USDT, DAI, USDe and PYUSD from public Ethereum pools (utilpeek by Tanod). Use when an agent must check whether USDC, USDT, DAI, USDe or PYUSD still trades at one dollar, fr…

by tanod.dev · discovered, not yet claimed by its owner · updated 2026-10-13

30d calls1

30d payers1

MethodPOST

Outputjson

Mirrored from Coinbase's public x402 Bazaar. The description is the provider's own text and has not been reviewed here; the payment requirements are copied as published.

What it does

Tags: utilpeek · fx · stablecoin · peg · fx-rates · bazaar · builder-code · erc20ApprovalGasSponsoring · payment-identifier

Call contract

Method: POST
Input: json
Output: json
Last paid call: 2026-10-13

Input example from Bazaar metadata

{}

Output example

{
  "age_s": 0,
  "block": 26181166,
  "cached": false,
  "chain": "ethereum",
  "coins": [
    {
      "coin": "USDC",
      "cross_check": [
        {
          "coin_price_in_usdc": "0.99887095",
          "depth_usd": 33902678,
          "implied_usdc_price_usd": "1.0011303",
          "pool": "0x3416cF6C708Da44DB2624D63ea0AAef7113527C6",
          "venue": "uniswap_v3",
          "vs": "USDT"
        },
        {
          "coin_price_in_usdc": "0.99996720",
          "depth_usd": 1421443,
          "implied_usdc_price_usd": "1.0000328",
          "pool": "0x5777d92f208679DB4b9778590Fa3CAB3aC9e2168",
          "venue": "uniswap_v3",
          "vs": "DAI"
        }
      ],
      "depth_usd": null,
      "deviation_bps": 2.43,
      "pools": [],
      "price_basis": "cross_check",
      "price_usd": "1.0002433",
      "quoted_in": null,
      "reference_spread_bps": 11.74,
      "status": "on_peg",
      "thin": false
    },
    {
      "coin": "USDT",
      "depth_usd": 33902678,
      "deviation_bps": -11.29,
      "pool_spread_bps": 1.87,
      "pools": [
        {
          "ask": "0.99897097",
          "bid": "0.99877095",
          "coin_in_pool": 28342870,
          "depth_usd": 33902678,
          "deviation_bps": -11.29,
          "fee_tier": 100,
          "impact_bps_10k": 0.11,
          "pool": "0x3416cF6C708Da44DB2624D63ea0AAef7113527C6",
          "price_usd": "0.99887095",
          "thin": false,
          "usdc_in_pool": 5559808,
          "venue": "uniswap_v3"
        },
        {
          "ask": "0.99955757",
          "bid": "0.99855719",
          "coin_in_pool": 348500,
          "depth_usd": 497183,
          "deviation_bps": -9.43,
          "fee_tier": 500,
          "impact_bps_10k": 0.86,
          "pool": "0x7858E59e0C01EA06Df3aF3D20aC7B0003275D4Bf",
          "price_usd": "0.99905725",
          "thin": false,
          "usdc_in_pool": 148683,
          "venue": "uniswap_v3"
        }
      ],
      "price_basis": "pool",
      "price_usd": "0.99887095",
      "quoted_in": "USDC",
      "status": "on_peg",
      "thin": false
    }
  ],
  "disclaimer": "Indicative on-chain prices read from public Uniswap V3 pools on Ethereum at the stated block. They…",
  "errors": [],
  "indicative": true,
  "licence": "Chain data: no licence restrictions, anyone may read and use it.",
  "method": "Each coin is priced against USDC in Uniswap V3 pools on Ethereum (QuoterV2 eth_calls at USD 100, fe…",
  "quote_asset": "USDC",
  "read_at": "2026-10-13T04:25:33Z",
  "thresholds_bps": {
    "off_peg_above": 200,
    "on_peg_below": 50,
    "rule": "on_peg if |deviation_bps| < 50; watch from 50 to 200; off_peg if above 200"
  },
  "timestamp": "2026-10-13T04:25:23Z",
  "warnings": []
}

Use with an agent

Discover. Agents find this listing with GET https://bazaar.saylorinnovations.com/discovery/search?query=…, the MCP tool search_resources, or /discovery/resources.
Inspect. Fetch /resources/57616.json for the price and payment options.
Pay. Call GET https://tanod.dev/v1/fx/stablecoin-peg. The provider answers 402 with its payment requirements. An x402 client signs one of the options below and retries with PAYMENT-SIGNATURE.
Execute. The provider returns 200 with the data. Agent Bazaar is not in the request path and never sees your payment.

For humans

You don't need an account or an API key; you need a wallet holding a small amount of USDC on Base, Polygon, Solana, eip155:56, Arbitrum One, and an x402-capable client (see the examples below). Call the endpoint unpaid first to see exactly what it asks for.

Pricing & payment

Price: $0.001 / request
Protocol: x402 v2
Auth: No account or API key. Pay per request.
Networks: Base, Polygon, Solana, eip155:56, Arbitrum One
Demand: 1 calls · 1 unique payers in 30d (public x402 Bazaar data)

x402 payment requirements

Scheme	Network	Asset	Amount	Pay to	Timeout
exact	Base eip155:8453	USDC	$0.001	0x593857A4a4F619543ea12394137C3004ce841720	300s
exact	Polygon eip155:137	USDC	$0.001	0x593857A4a4F619543ea12394137C3004ce841720	300s
exact	Solana solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp	USDC	$0.001	RMk9k3VC8dr4hhjgFh88rGhjAbzfBzHxJJ5n2fTcqus	300s
exact	eip155:56 eip155:56	0x8AC76a51cc950d9822D68b83fE1Ad97B32Cd580d	1000000000000000	0x593857A4a4F619543ea12394137C3004ce841720	300s
exact	Arbitrum One eip155:42161	USDC	$0.001	0x593857A4a4F619543ea12394137C3004ce841720	300s
exact	Base eip155:8453	USDC	$0.001	0x593857A4a4F619543ea12394137C3004ce841720	604900s
exact	Polygon eip155:137	USDC	$0.001	0x593857A4a4F619543ea12394137C3004ce841720	604900s

accepts[] (raw JSON)

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x593857A4a4F619543ea12394137C3004ce841720",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "1000",
    "amountUsd": 0.001,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "eip155:137",
    "payTo": "0x593857A4a4F619543ea12394137C3004ce841720",
    "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
    "amount": "1000",
    "amountUsd": 0.001,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "payTo": "RMk9k3VC8dr4hhjgFh88rGhjAbzfBzHxJJ5n2fTcqus",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "1000",
    "amountUsd": 0.001,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "eip155:56",
    "payTo": "0x593857A4a4F619543ea12394137C3004ce841720",
    "asset": "0x8AC76a51cc950d9822D68b83fE1Ad97B32Cd580d",
    "amount": "1000000000000000",
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "eip155:42161",
    "payTo": "0x593857A4a4F619543ea12394137C3004ce841720",
    "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
    "amount": "1000",
    "amountUsd": 0.001,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x593857A4a4F619543ea12394137C3004ce841720",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "1000",
    "amountUsd": 0.001,
    "maxTimeoutSeconds": 604900
  },
  {
    "scheme": "exact",
    "network": "eip155:137",
    "payTo": "0x593857A4a4F619543ea12394137C3004ce841720",
    "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
    "amount": "1000",
    "amountUsd": 0.001,
    "maxTimeoutSeconds": 604900
  }
]

Schemas

Output schema (JSON Schema)

{
  "properties": {
    "example": {
      "description": "Abridged to fit the header. Full example: the 402 JSON body. Full schema: https://tanod.dev/openapi.json POST /v1/fx/stablecoin-peg",
      "properties": {
        "age_s": {
          "type": "integer"
        },
        "block": {
          "type": [
            "integer",
            "null"
          ]
        },
        "cached": {
          "type": "boolean"
        },
        "chain": {
          "type": "string"
        },
        "coins": {
          "type": "array"
        },
        "disclaimer": {
          "type": "string"
        },
        "errors": {
          "type": "array"
        },
        "indicative": {
          "type": "boolean"
        },
        "licence": {
          "type": "string"
        },
        "method": {
          "type": "string"
        },
        "quote_asset": {
          "type": "string"
        },
        "read_at": {
          "type": [
            "string",
            "null"
          ]
        },
        "thresholds_bps": {
          "type": "object"
        },
        "timestamp": {
          "type": [
            "string",
            "null"
          ]
        },
        "warnings": {
          "type": "array"
        }
      },
      "required": [
        "chain",
        "coins",
        "errors",
        "thresholds_bps",
        "indicative",
        "disclaimer"
      ],
      "type": "object"
    },
    "type": {
      "type": "string"
    }
  },
  "required": [
    "type"
  ],
  "type": "object"
}

Example shape — generated from the schema, not a captured live response

{
  "example": {
    "age_s": 0,
    "block": 0,
    "cached": true,
    "chain": "string",
    "coins": [
      "value"
    ],
    "disclaimer": "string",
    "errors": [
      "value"
    ],
    "indicative": true,
    "licence": "string",
    "method": "string",
    "quote_asset": "string",
    "read_at": "string",
    "thresholds_bps": {},
    "timestamp": "string",
    "warnings": [
      "value"
    ]
  },
  "type": "string"
}

Examples

curl

curl "https://tanod.dev/v1/fx/stablecoin-peg"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://tanod.dev/v1/fx/stablecoin-peg");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

Python

import httpx
res = httpx.get("https://tanod.dev/v1/fx/stablecoin-peg")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header

Details

Provider: tanod.dev
Endpoint: https://tanod.dev/v1/fx/stablecoin-peg
Machine-readable: /resources/57616.json