Roundhouse

MYC Federal Contract Changes

Detect economically material changes to SAM.gov federal contract opportunities, including deadline moves, solicitation amendments, attachment changes, set-aside, NAICS, status, and award changes. Returns an immutable before/after delta with materiality, reason codes, and provenance for procurement and capture agents.

OtherLiveeip155:8453Exactvia cdp
https://myc-staging.crescadia.com/v1/paid/products/:product_event_id
Sam-govFederal-contractsContract-changesProcurementSolicitation-amendments
Calls · 30d
3
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 8 snapshots so far.
$0.02
Verified settled volume
2 settlements proven x402 by their on-chain EIP-3009 marker.
$0.010
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 2026-09-17 05:02Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0xc54cAF5be3660c0558700B7a64103904eC9c861C

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.

Accepts

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

0.01USDC≈ $0.01 USD
on Base · exact scheme

Pay 0.01 USDC on Base to 0xc54c…c861C. The signed payment is good for 5 minutes.

Paid to
0xc54c…c861C
USD Coin contract
0x8335…02913
Payment window
5 minutes
As published
10000 smallest units
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0xc54cAF5be3660c0558700B7a64103904eC9c861C",
    "amount": "10000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET",
        "pathParams": {
          "product_event_id": "product_5b0221871e05ed90476245bc0d55484f"
        }
      },
      "output": {
        "type": "json",
        "example": {
          "events": [
            {
              "event": "attachments_changed",
              "field": "resource_links",
              "reason": "Attachment/resource changes may alter requirements.",
              "current": [
                "https://sam.gov/example/attachment-v2"
              ],
              "previous": [
                "https://sam.gov/example/attachment-v1"
              ],
              "materiality": 0.85
            }
          ],
          "source": "SAM.gov",
          "changed": true,
          "product": {
            "price": {
              "amount": "0.01",
              "currency": "USD"
            },
            "product_id": "federal_opportunity.delta",
            "event_digest": "example",
            "product_version": "1",
            "product_event_id": "product_example"
          },
          "notice_id": "example-notice-id",
          "confidence": 1,
          "provenance": {
            "source": "SAM.gov",
            "materiality_threshold": 0.65
          },
          "event_count": 1,
          "material_changed": true,
          "material_event_count": 1
        }
      }
    },
    "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"
            },
            "pathParams": {
              "type": "object",
              "required": [
                "product_event_id"
              ],
              "properties": {
                "product_event_id": {
                  "type": "string",
                  "description": "Immutable MYC priced product event identifier."
                }
              }
            },
            "queryParams": {
              "type": "object",
              "properties": {}
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "type": "object",
              "required": [
                "notice_id",
                "changed",
                "material_changed",
                "event_count",
                "material_event_count",
                "events",
                "source",
                "confidence",
                "provenance",
                "product"
              ],
              "properties": {
                "events": {
                  "type": "array",
                  "items": {
                    "type": "object",
                    "required": [
                      "field",
                      "event",
                      "materiality",
                      "reason"
                    ],
                    "properties": {
                      "event": {
                        "type": "string"
                      },
                      "field": {
                        "type": "string"
                      },
                      "reason": {
                        "type": "string"
                      },
                      "current": {},
                      "previous": {},
                      "materiality": {
                        "type": "number"
                      }
                    }
                  }
                },
                "source": {
                  "type": "string"
                },
                "changed": {
                  "type": "boolean"
                },
                "product": {
                  "type": "object",
                  "required": [
                    "product_event_id",
                    "product_id",
                    "product_version",
                    "event_digest",
                    "price"
                  ],
                  "properties": {
                    "price": {
                      "type": "object",
                      "required": [
                        "amount",
                        "currency"
                      ],
                      "properties": {
                        "amount": {
                          "type": "string"
                        },
                        "currency": {
                          "type": "string"
                        }
                      }
                    },
                    "product_id": {
                      "type": "string"
                    },
                    "event_digest": {
                      "type": "string"
                    },
                    "product_version": {
                      "type": "string"
                    },
                    "product_event_id": {
                      "type": "string"
                    }
                  }
                },
                "notice_id": {
                  "type": "string"
                },
                "confidence": {
                  "type": "number"
                },
                "provenance": {
                  "type": "object"
                },
                "event_count": {
                  "type": "integer"
                },
                "material_changed": {
                  "type": "boolean"
                },
                "material_event_count": {
                  "type": "integer"
                }
              }
            }
          }
        }
      }
    },
    "routeTemplate": "/v1/paid/products/:product_event_id"
  }
}

Provenance

Seen in the source catalog
2026-09-17 05:02Z
Last indexed by Roundhouse
2026-09-24 10:40Z
Last enriched (probe, favicon, geo)
2026-09-17 07:45Z
x402 version
2
Max timeout
300s
Liveness probe
HTTP 404
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. 8 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 MYC Federal Contract Changes 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=MYC%20Federal%20Contract%20Changes'
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://myc-staging.crescadia.com/v1/paid/products/:product_event_id, 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.