Roundhouse

StationFX

A function marketplace for AI agents. Functions on demand — pay per call in USDC on Base via x402. No API keys, no subscriptions. Browse economic data, signals, and compute functions.

DataLiveeip155:8453Exactvia cdp
https://stationfx.com/economic-data/money-supply/velocity-of-m2-money-stock
Function-marketplaceEconomic-dataTime-seriesx402Ai-agents
Settlements · 30d
557
No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days.
$6.16
Verified settled volume
702 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.
3
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-09-23 17:52Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x22f7e9518dff04a5db1fddaabc0e001b8c425b3a

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",
  "x402Version": 2
}

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 0x22f7…25b3a. The signed payment is good for 5 minutes.

Paid to
0x22f7…25b3a
USD Coin contract
0x8335…02913
Payment window
5 minutes
As published
5000 smallest units
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x22f7e9518dff04a5db1fddaabc0e001b8c425b3a",
    "amount": "5000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET",
        "queryParams": {
          "fmt": "json",
          "date_to": "2024-12-31",
          "date_from": "2024-01-01"
        }
      },
      "output": {
        "type": "json",
        "example": {
          "data": [
            {
              "date": "2024-01-01",
              "value": 5.33,
              "mom_pct": 0,
              "yoy_change": 0.5,
              "zscore_12m": 1.2,
              "trend_direction": 1
            }
          ],
          "meta": {
            "frequency": "Q",
            "source_key": "M2V"
          }
        }
      },
      "description": "GDP divided by M2 money supply — measures how efficiently money circulates in the economy. Declining velocity means more money is needed to generate the same output, a deflationary signal. Rising velocity can amplify inflation. Quarterly frequency, critical context for M2 growth interpretation."
    },
    "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",
              "description": "Always \"http\" for HTTP endpoints"
            },
            "method": {
              "enum": [
                "GET",
                "HEAD",
                "DELETE"
              ],
              "type": "string",
              "description": "HTTP method. Always GET for StationFX query endpoints"
            },
            "queryParams": {
              "type": "object",
              "properties": {
                "fmt": {
                  "enum": [
                    "json",
                    "toon"
                  ],
                  "type": "string",
                  "description": "Response format. Use toon for compact agent-friendly output."
                },
                "fields": {
                  "type": "string",
                  "description": "Comma-separated metric names"
                },
                "date_to": {
                  "type": "string",
                  "description": "End date YYYY-MM-DD"
                },
                "date_from": {
                  "type": "string",
                  "description": "Start date YYYY-MM-DD"
                }
              }
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string",
              "description": "Response format. Always \"json\" (or \"toon\" if fmt=toon was requested)"
            },
            "example": {
              "type": "object",
              "properties": {
                "data": {
                  "type": "array",
                  "items": {
                    "type": "object",
                    "properties": {
                      "date": {
                        "type": "string",
                        "description": "Observation date YYYY-MM-DD"
                      },
                      "value": {
                        "type": "number",
                        "description": "Raw observed value in series units"
                      },
                      "mom_pct": {
                        "type": "number",
                        "description": "Month-over-month % change"
                      },
                      "yoy_pct": {
                        "type": "number",
                        "description": "Year-over-year % change"
                      },
                      "zscore_5y": {
                        "type": "number",
                        "description": "Z-score relative to trailing 5 years"
                      },
                      "mom_change": {
                        "type": "number",
                        "description": "Month-over-month absolute change"
                      },
                      "yoy_change": {
                        "type": "number",
                        "description": "Year-over-year absolute change"
                      },
                      "zscore_12m": {
                        "type": "number",
                        "description": "Z-score relative to trailing 12 months"
                      },
                      "above_trend": {
                        "type": "integer",
                        "description": "1 if value is above long-run trend, else 0"
                      },
                      "pct_rank_5y": {
                        "type": "number",
                        "description": "Percentile rank over trailing 5 years (0-100)"
                      },
                      "rolling_3m_avg": {
                        "type": "number",
                        "description": "3-month rolling average"
                      },
                      "rolling_12m_avg": {
                        "type": "number",
                        "description": "12-month rolling average"
                      },
                      "trend_direction": {
                        "type": "integer",
                        "description": "Trend: 1 rising, -1 falling, 0 flat"
                      }
                    }
                  },
                  "description": "Observations ordered by date ascending"
                },
                "meta": {
                  "type": "object",
                  "description": "Series metadata: source_key (FRED series ID), units, frequency (D/W/M/Q/A), date_from, date_to, fields"
                }
              },
              "description": "Station f(x) response with metadata and pre-computed derived metrics"
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-09-23 17:52Z
Last indexed by Roundhouse
2026-09-24 07:20Z
Last enriched (probe, favicon, geo)
2026-09-23 05:45Z
x402 version
2
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

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 StationFX 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=StationFX'
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://stationfx.com/economic-data/money-supply/velocity-of-m2-money-stock, 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.