Roundhouse

x402.asterpay.io

Stablecoin supply by issuer, USD and EUR pegged. Total circulating USD- and EUR-pegged stablecoin supply and the top issuers with 7-day change, aggregated across chains. Source: DefiLlama. Cadence: 15m.

TradingLiveeip155:8453Exactvia wellknown:x402.asterpay.io
https://x402.asterpay.io/v1/data/stablecoins/supply
Settlements · 30d
28↑ 40%
No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days.
$1.61
Verified settled volume
201 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0050
Listed price
As published in the catalog. Always read the live 402 before paying.
—
Calls · 30d
Upstream's own call count for this endpoint, not ours.
—
Unique payers · 30d
Never called
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0xd5f8481D8F25d3966d2010DBf9B47fFbdf745A9E

The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.

Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Provider

The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.

Live 402 challenge

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

{
  "mpp": {
    "sdk": "npm install mppx — or pip install pympp",
    "spec": "https://mpp.dev",
    "methods": [
      "asterpay"
    ],
    "howToPay": [
      "1. Read WWW-Authenticate: Payment header for challenge details",
      "2. Send USDC on Base to the recipient address",
      "3. Retry with Authorization: Payment <credential> containing txHash"
    ],
    "supported": true
  },
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xd5f8481D8F25d3966d2010DBf9B47fFbdf745A9E",
      "amount": "5000",
      "scheme": "exact",
      "network": "eip155:8453",
      "mimeType": "application/json",
      "resource": "https://x402.asterpay.io/v1/data/stablecoins/supply",
      "description": "Stablecoin supply by issuer, USD and EUR pegged. Total circulating USD- and EUR-pegged stablecoin supply and the top issuers with 7-day change, aggregated across chains. Source: DefiLlama. Cadence: 15m.",
      "outputSchema": {
        "input": {
          "type": "http",
          "method": "GET",
          "schema": {
            "type": "object",
            "properties": {},
            "additionalProperties": false
          }
        },
        "output": {
          "type": "json",
          "example": {
            "data": {
              "...": "door-specific payload"
            },
            "stale": false,
            "source": {
              "url": "https://defillama.com/stablecoins",
              "name": "DefiLlama",
              "license": "DefiLlama open API"
            },
            "cadence": "15m",
            "success": true,
            "timestamp": "2026-09-09T17:55:10Z",
            "fetched_at": "2026-09-09T17:41:02Z",
            "observed_at": "2026-09-09T00:00:00Z",
            "next_expected": "2026-09-10T00:00:00Z"
          }
        }
      },
      "maxAmountRequired": "5000",
      "maxTimeoutSeconds": 300
    },
    {
      "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xd5f8481D8F25d3966d2010DBf9B47fFbdf745A9E",
      "amount": "5000",
      "scheme": "exact",
      "network": "eip155:137",
      "mimeType": "application/json",
      "resource": "https://x402.asterpay.io/v1/data/stablecoins/supply",
      "description": "Stablecoin supply by issuer, USD and EUR pegged. Total circulating USD- and EUR-pegged stablecoin supply and the top issuers with 7-day change, aggregated across chains. Source: DefiLlama. Cadence: 15m.",
      "maxAmountRequired": "5000",
      "maxTimeoutSeconds": 300
    },
    {
      "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xd5f8481D8F25d3966d2010DBf9B47fFbdf745A9E",
      "amount": "5000",
      "scheme": "exact",
      "network": "eip155:42161",
      "mimeType": "application/json",
      "resource": "https://x402.asterpay.io/v1/data/stablecoins/supply",
      "description": "Stablecoin supply by issuer, USD and EUR pegged. Total circulating USD- and EUR-pegged stablecoin supply and the top issuers with 7-day change, aggregated across chains. Source: DefiLlama. Cadence: 15m.",
      "maxAmountRequired": "5000",
      "maxTimeoutSeconds": 300
    },
    {
      "asset": "0x0b2C639c533813f4Aa9D7837CAf62653d097Ff85",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xd5f8481D8F25d3966d2010DBf9B47fFbdf745A9E",
      "amount": "5000",
      "scheme": "exact",
      "network": "eip155:10",
      "mimeType": "application/json",
      "resource": "https://x402.asterpay.io/v1/data/stablecoins/supply",
      "description": "Stablecoin supply by issuer, USD and EUR pegged. Total circulating USD- and EUR-pegged stablecoin supply and the top issuers with 7-day change, aggregated across chains. Source: DefiLlama. Cadence: 15m.",
      "maxAmountRequired": "5000",
      "maxTimeoutSeconds": 300
    },
    {
      "asset": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xd5f8481D8F25d3966d2010DBf9B47fFbdf745A9E",
      "amount": "5000",
      "scheme": "exact",
      "network": "eip155:1",
      "mimeType": "application/json",
      "resource": "https://x402.asterpay.io/v1/data/stablecoins/supply",
      "description": "Stablecoin supply by issuer, USD and EUR pegged. Total circulating USD- and EUR-pegged stablecoin supply and the top issuers with 7-day change, aggregated across chains. Source: DefiLlama. Cadence: 15m.",
      "maxAmountRequired": "5000",
      "maxTimeoutSeconds": 300
    },
    {
      "asset": "0x85889c8c714505E0c94b30fcfcF64fE3Ac8FCb20",
      "extra": {
        "name": "USDC",
        "version": "1"
      },
      "payTo": "0xd5f8481D8F25d3966d2010DBf9B47fFbdf745A9E",
      "amount": "5000",
      "scheme": "exact",
      "network": "eip155:1187947933",
      "mimeType": "application/json",
      "resource": "https://x402.asterpay.io/v1/data/stablecoins/supply",
      "description": "Stablecoin supply by issuer, USD and EUR pegged. Total circulating USD- and EUR-pegged stablecoin supply and the top issuers with 7-day change, aggregated across chains. Source: DefiLlama. Cadence: 15m.",
      "maxAmountRequired": "5000",
      "maxTimeoutSeconds": 300
    }
  ],
  "howToPay": {
    "mpp": {
      "sdk": "npm install mppx — or pip install pympp",
      "steps": [
        "1. Read WWW-Authenticate: Payment header for challenge",
        "2. Send USDC on Base to the recipient address",
        "3. Retry with header: Authorization: Payment <base64url-credential>"
      ]
    },
    "docs": "https://x402.asterpay.io/docs",
    "x402": {
      "sdk": "npm install @x402/fetch — or pip install x402",
      "steps": [
        "1. Read accepts[0] for payment details (network, asset, amount, payTo)",
        "2. Send USDC on Base via transferWithAuthorization (EIP-3009)",
        "3. Base64-encode the signed payment payload",
        "4. Retry with header: PAYMENT-SIGNATURE: <base64-payload>"
      ]
    },
    "asset": "USDC (native on each chain)",
    "price": "$0.005 USDC",
    "networks": "Base, Polygon, Arbitrum, Optimism, Ethereum",
    "protocols": [
      "x402",
      "mpp"
    ],
    "freeEndpoints": [
      "GET /v2/x402/offramp/estimate?amount={usdc} — free (EUR settlement estimate)",
      "GET /v2/x402/market/rates — free",
      "GET /v1/agent/trust-score/{address} — free",
      "GET /v1/agent/discovery — free",
      "GET /v1/settlement/estimate?amount={usdc} — free",
      "GET /v1/probe/trust-score?address={addr} — free",
      "GET /v1/probe/agents — free",
      "GET /v1/probe/stats — free"
    ]
  },
  "resource": {
    "url": "https://x402.asterpay.io/v1/data/stablecoins/supply",
    "mimeType": "application/json",
    "description": "Stablecoin supply by issuer, USD and EUR pegged. Total circulating USD- and EUR-pegged stablecoin supply and the top issuers with 7-day change, aggregated across chains. Source: DefiLlama. Cadence: 15m."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {}
        },
        "output": {
          "type": "json",
          "example": {
            "data": {
              "...": "door-specific payload"
            },
            "stale": false,
            "source": {
              "url": "https://defillama.com/stablecoins",
              "name": "DefiLlama",
              "license": "DefiLlama open API"
            },
            "cadence": "15m",
            "success": true,
            "timestamp": "2026-09-09T17:55:10Z",
            "fetched_at": "2026-09-09T17:41:02Z",
            "observed_at": "2026-09-09T00:00:00Z",
            "next_expected": "2026-09-10T00:00:00Z"
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET",
                  "HEAD",
                  "DELETE"
                ],
                "type": "string"
              },
              "headers": {
                "type": "object",
                "additionalProperties": {
                  "type": "string"
                }
              },
              "queryParams": {
                "type": "object",
                "properties": {},
                "additionalProperties": false
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    },
    "payment-identifier": {
      "info": {
        "required": false
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "required"
        ],
        "properties": {
          "id": {
            "type": "string",
            "pattern": "^[a-zA-Z0-9_-]+$",
            "maxLength": 128,
            "minLength": 16
          },
          "required": {
            "type": "boolean"
          }
        }
      }
    }
  },
  "description": "Stablecoin supply by issuer, USD and EUR pegged. Total circulating USD- and EUR-pegged stablecoin supply and the top issuers with 7-day change, aggregated across chains. Source: DefiLlama. Cadence: 15m.",
  "x402Version": 2,
  "first_call_free": {
    "how": "Retry with a normally signed PAYMENT-SIGNATURE. If your wallet has never paid AsterPay before, the authorization is verified but NOT settled — your first call costs $0. No opt-in needed.",
    "max_price_usd": 0.02,
    "one_per_wallet": true,
    "requires_balance": true,
    "eligible_endpoint": true,
    "requires_balance_note": "Your wallet must hold at least the endpoint price for your x402/MPP client to sign the authorization. AsterPay verifies but does not settle it, so nothing is deducted. Clients that pre-check balance will refuse to sign below the price.",
    "zero_balance_alternative": "No wallet balance at all? Every endpoint under freeEndpoints below answers with no payment and no signature."
  }
}

Accepts

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

0.005USDC≈ $0.005 USD
on Base · exact scheme

Pay 0.005 USDC on Base to 0xd5f8…45A9E.

Paid to
0xd5f8…45A9E
USD Coin contract
0x8335…02913
As published
5000 smallest units
5000units
on Polygon · exact scheme

That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.

Paid to
0xd5f8…45A9E
Token contract
0x3c49…c3359
5000units
on Arbitrum · exact scheme

That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.

Paid to
0xd5f8…45A9E
Token contract
0xaf88…e5831
5000units
on Optimism · exact scheme

That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.

Paid to
0xd5f8…45A9E
Token contract
0x0b2C…7Ff85
5000units
on Ethereum · exact scheme

That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.

Paid to
0xd5f8…45A9E
Token contract
0xA0b8…6eB48
5000units
on eip155:1187947933 · exact scheme

That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.

Paid to
0xd5f8…45A9E
Token contract
0x8588…FCb20
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "payTo": "0xd5f8481D8F25d3966d2010DBf9B47fFbdf745A9E",
    "amount": "5000",
    "scheme": "exact",
    "network": "eip155:8453"
  },
  {
    "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
    "payTo": "0xd5f8481D8F25d3966d2010DBf9B47fFbdf745A9E",
    "amount": "5000",
    "scheme": "exact",
    "network": "eip155:137"
  },
  {
    "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
    "payTo": "0xd5f8481D8F25d3966d2010DBf9B47fFbdf745A9E",
    "amount": "5000",
    "scheme": "exact",
    "network": "eip155:42161"
  },
  {
    "asset": "0x0b2C639c533813f4Aa9D7837CAf62653d097Ff85",
    "payTo": "0xd5f8481D8F25d3966d2010DBf9B47fFbdf745A9E",
    "amount": "5000",
    "scheme": "exact",
    "network": "eip155:10"
  },
  {
    "asset": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
    "payTo": "0xd5f8481D8F25d3966d2010DBf9B47fFbdf745A9E",
    "amount": "5000",
    "scheme": "exact",
    "network": "eip155:1"
  },
  {
    "asset": "0x85889c8c714505E0c94b30fcfcF64fE3Ac8FCb20",
    "payTo": "0xd5f8481D8F25d3966d2010DBf9B47fFbdf745A9E",
    "amount": "5000",
    "scheme": "exact",
    "network": "eip155:1187947933"
  }
]

Provenance

Seen in the source catalog
—
Last indexed by Roundhouse
2026-09-22 03:15Z
Last enriched (probe, favicon, geo)
2026-09-22 03:45Z
x402 version
2
Max timeout
—
Liveness probe
HTTP 402
Report

Hand this page to an agent

Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.

GET api.roundhouseai.io/v0/endpoints

No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days. Verified volume counts only settlements with an on-chain EIP-3009 marker.

Open skill.md
Show the prompt
Using Roundhouse, look up the x402 service x402.asterpay.io and tell me whether it is
worth paying: what a call costs, whether the endpoint answered when last probed, and what
its payment record actually shows.

curl -s 'https://api.roundhouseai.io/v0/endpoints?q=x402.asterpay.io'
curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>'

Then call it: read the price from the live 402 at https://x402.asterpay.io/v1/data/stablecoins/supply, never from
a cached figure, and pay with an x402 client.

The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except
/v0/unified* and /v0/endpoints. Mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402,
or use an organization key from https://roundhouseai.io/dashboard/team.

If you do not have Roundhouse tools or skills installed, read
https://roundhouseai.io/skill.md first — it is the whole procedure.