Roundhouse AI

api.strale.io

Check stablecoin supply and flows. Query by chain (stablecoin supply on Ethereum, Base, etc.), by stablecoin (USDC market cap and circulation), or get the overall market summary. Data from DeFi Llama.

TradingLiveeip155:8453Exactvia cdp
https://api.strale.io/x402/stablecoin-flow-check
Calls · 30d
5↑ 35%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 30 snapshots so far.
$359.43
Verified settled volume
A floor: summed over 5,000 of 9,036 verified settlements.
$0.022
Listed price
As published in the catalog. Always read the live 402 before paying.
5
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-09-19 07:32Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x66D7C2F952362BFB24FD7F02a9beC9c754ea83bC

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.

{
  "error": "Payment required. Stablecoin Flow Check costs $0.0216 USDC per call.",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x66D7C2F952362BFB24FD7F02a9beC9c754ea83bC",
      "scheme": "exact",
      "network": "base",
      "mimeType": "application/json",
      "resource": "https://api.strale.io/x402/stablecoin-flow-check",
      "description": "Check stablecoin supply and flows. Query by chain (stablecoin supply on Ethereum, Base, etc.), by stablecoin (USDC market cap and circulation), or get the overall market summary. Data from DeFi Llama.",
      "outputSchema": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "chain": {
              "type": "string",
              "description": "Chain name (e.g., 'Ethereum', 'Base', 'Solana')"
            },
            "stablecoin": {
              "type": "string",
              "description": "Stablecoin name (e.g., 'USDC', 'USDT')"
            }
          },
          "discoverable": true
        },
        "output": {
          "chain": {
            "type": "string"
          },
          "details": {
            "type": "object"
          },
          "query_type": {
            "type": "string"
          },
          "stablecoin": {
            "type": "string"
          },
          "total_supply_usd": {
            "type": "number"
          }
        }
      },
      "maxAmountRequired": "21600",
      "maxTimeoutSeconds": 300
    }
  ],
  "resource": {
    "url": "https://api.strale.io/x402/stablecoin-flow-check",
    "mimeType": "application/json",
    "description": "Check stablecoin supply and flows. Query by chain (stablecoin supply on Ethereum, Base, etc.), by stablecoin (USDC market cap and circulation), or get the overall market summary. Data from DeFi Llama."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "chain": "example_chain",
            "stablecoin": "example_stablecoin"
          }
        }
      },
      "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"
              },
              "queryParams": {
                "type": "object",
                "properties": {
                  "chain": {
                    "type": "string",
                    "description": "Chain name (e.g., 'Ethereum', 'Base', 'Solana')"
                  },
                  "stablecoin": {
                    "type": "string",
                    "description": "Stablecoin name (e.g., 'USDC', 'USDT')"
                  }
                }
              }
            },
            "additionalProperties": false
          }
        }
      }
    }
  },
  "x402Version": 1,
  "paymentRequirements": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x66D7C2F952362BFB24FD7F02a9beC9c754ea83bC",
      "scheme": "exact",
      "network": "base",
      "mimeType": "application/json",
      "resource": "https://api.strale.io/x402/stablecoin-flow-check",
      "description": "Check stablecoin supply and flows. Query by chain (stablecoin supply on Ethereum, Base, etc.), by stablecoin (USDC market cap and circulation), or get the overall market summary. Data from DeFi Llama.",
      "outputSchema": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "chain": {
              "type": "string",
              "description": "Chain name (e.g., 'Ethereum', 'Base', 'Solana')"
            },
            "stablecoin": {
              "type": "string",
              "description": "Stablecoin name (e.g., 'USDC', 'USDT')"
            }
          },
          "discoverable": true
        },
        "output": {
          "chain": {
            "type": "string"
          },
          "details": {
            "type": "object"
          },
          "query_type": {
            "type": "string"
          },
          "stablecoin": {
            "type": "string"
          },
          "total_supply_usd": {
            "type": "number"
          }
        }
      },
      "maxAmountRequired": "21600",
      "maxTimeoutSeconds": 300
    }
  ]
}

Accepts

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

0.0216USDC≈ $0.0216 USD
on Base · exact scheme

Pay 0.0216 USDC on Base to 0x66D7…a83bC. The signed payment is good for 5 minutes.

Paid to
0x66D7…a83bC
USD Coin contract
0x8335…02913
Payment window
5 minutes
As published
21600 smallest units
Buys
Check stablecoin supply and flows. Query by chain (stablecoin supply on Ethereum, Base, etc.), by stablecoin (USDC market cap and circulation), or get the overall market summary. Data from DeFi Llama.
Returns
application/json
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x66D7C2F952362BFB24FD7F02a9beC9c754ea83bC",
    "scheme": "exact",
    "network": "base",
    "mimeType": "application/json",
    "resource": "https://api.strale.io/x402/stablecoin-flow-check",
    "description": "Check stablecoin supply and flows. Query by chain (stablecoin supply on Ethereum, Base, etc.), by stablecoin (USDC market cap and circulation), or get the overall market summary. Data from DeFi Llama.",
    "outputSchema": {
      "input": {
        "type": "http",
        "method": "GET",
        "queryParams": {
          "chain": {
            "type": "string",
            "description": "Chain name (e.g., 'Ethereum', 'Base', 'Solana')"
          },
          "stablecoin": {
            "type": "string",
            "description": "Stablecoin name (e.g., 'USDC', 'USDT')"
          }
        },
        "discoverable": true
      },
      "output": {
        "chain": {
          "type": "string"
        },
        "details": {
          "type": "object"
        },
        "query_type": {
          "type": "string"
        },
        "stablecoin": {
          "type": "string"
        },
        "total_supply_usd": {
          "type": "number"
        }
      }
    },
    "maxAmountRequired": "21600",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET",
        "queryParams": {
          "chain": {
            "type": "string",
            "description": "Chain name (e.g., 'Ethereum', 'Base', 'Solana')"
          },
          "stablecoin": {
            "type": "string",
            "description": "Stablecoin name (e.g., 'USDC', 'USDT')"
          }
        }
      },
      "output": {}
    },
    "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"
              ],
              "type": "string"
            },
            "queryParams": {
              "type": "object"
            }
          }
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-09-19 07:32Z
Last indexed by Roundhouse
2026-09-24 13:10Z
Last enriched (probe, favicon, geo)
2026-09-24 12:15Z
x402 version
1
Max timeout
300s
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

This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 30 snapshots so far. 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 api.strale.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=api.strale.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://api.strale.io/x402/stablecoin-flow-check, 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.