agentwares-stablecoin.vercel.app

Live 402 challenge

Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.

{
  "fix": "Free first: retry with sample=true — no key, no payment. Pay in USDC with no account and no human: take the `accepts` entry with `rail: \"x402\"`, sign an EIP-3009 transferWithAuthorization for 0.02 USDC to 0x48e7DFa6958E8f71EF5fb417c88CbCA21DA482c5 on eip155:8453, and retry with it base64 in the X-PAYMENT header. The facilitator submits the transfer, so you need USDC and no gas. Or pay by card: POST https://agentwares-stablecoin.vercel.app/v1/keys (no auth, no signup) returns a key and a Stripe Checkout URL. Funding that key needs a person at a browser; if you are running unattended, surface the URL to your operator rather than retrying, or use the USDC rail above. Once funded, send Authorization: Bearer <key>, plus Idempotency-Key so a repeated call is charged once.",
  "code": "PAYMENT_REQUIRED",
  "cause": "This call costs $0.02. No valid payment or credit was presented.",
  "accepts": [
    {
      "rail": "x402",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x48e7DFa6958E8f71EF5fb417c88CbCA21DA482c5",
      "amount": "20000",
      "scheme": "exact",
      "network": "eip155:8453",
      "mimeType": "application/json",
      "resource": "https://agentwares-stablecoin.vercel.app/v1/reserves/:symbol",
      "amountUsd": "0.02",
      "description": "One stablecoin reserve attestation lookup",
      "maxTimeoutSeconds": 300
    },
    {
      "rail": "prepaid_credits",
      "payTo": "https://agentwares-stablecoin.vercel.app/v1/keys",
      "currency": "usd",
      "resource": "https://agentwares-stablecoin.vercel.app/v1/reserves/:symbol",
      "amountUsd": "0.02",
      "description": "One stablecoin reserve attestation lookup",
      "humanRequired": true,
      "maxTimeoutSeconds": 300
    }
  ],
  "details": {
    "reason": "no prepaid credit key sent"
  },
  "priceUsd": 0.02,
  "retryable": true,
  "selfServe": {
    "keysUrl": "https://agentwares-stablecoin.vercel.app/v1/keys",
    "packsUsd": [
      10,
      50,
      200
    ],
    "creditsUrl": "https://agentwares-stablecoin.vercel.app/v1/credits",
    "creditsX402Url": "https://agentwares-stablecoin.vercel.app/v1/credits/x402",
    "idempotencyHeader": "Idempotency-Key"
  },
  "comingSoon": false,
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "pathParams": {
            "symbol": "USDC"
          },
          "queryParams": {
            "period": "2026-07"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "peg": "USD",
            "as_of": "2026-07-31",
            "issuer": "Circle Internet Financial, LLC",
            "period": "2026-07",
            "symbol": "USDC",
            "backing": "fiat",
            "currency": "USD",
            "source_url": "https://agentwares-stablecoin.vercel.app/v1/reserves/USDC",
            "reserve_ratio": 1.001,
            "total_reserves_usd": 71904101332,
            "tokens_in_circulation_reported": 71826453410
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "method": {
                "type": "string"
              }
            }
          },
          "output": {
            "type": "object"
          }
        }
      },
      "routeTemplate": "/v1/reserves/:symbol"
    }
  },
  "x402Version": 2,
  "alternatives": [
    "api_key_credits",
    "sample_mode"
  ]
}

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.

[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x48e7DFa6958E8f71EF5fb417c88CbCA21DA482c5",
    "amount": "20000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  }
]

Provenance

Seen in the source catalog

2026-09-10 06:30Z

Last indexed by Roundhouse

2026-09-24 15:45Z

Last enriched (probe, favicon, geo)

2026-09-14 20:16Z

x402 version

2

Max timeout

300s

Liveness probe

HTTP 402