Roundhouse

changelog-state-api.replit.app

Detected changelog update history for one tracked vendor.

OtherLiveeip155:8453Exactvia facilitator:payAI
https://changelog-state-api.replit.app/api/monitors/figma/changes
Settlements · 30d
200↑ 140%
No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days.
$2.70
Verified settled volume
277 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.
—
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
0xb23c3825de4ca8a479183092ae8d1d58d2736fc9

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 of 0.01 USDC on Base or Solana is required for this resource. Re-issue this request with a PAYMENT-SIGNATURE header.",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xb23c3825de4ca8a479183092ae8d1d58d2736fc9",
      "amount": "10000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 120
    },
    {
      "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
      "extra": {
        "feePayer": "CjNFTjvBhbJJd2B5ePPMHRLx1ELZpa8dwQgGL727eKww"
      },
      "payTo": "6UNbfD8mgSqgFDxxwE29LfgKrBqrZBt4R4L4Resh4yct",
      "amount": "10000",
      "scheme": "exact",
      "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
      "maxTimeoutSeconds": 120
    }
  ],
  "resource": {
    "url": "https://changelog-state-api.replit.app/api/monitors/figma/changes",
    "mimeType": "application/json",
    "description": "Detected changelog update history for one tracked vendor.",
    "serviceName": "Changelog State API"
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "pathParams": {
            "slug": "figma"
          },
          "queryParams": {
            "type": "new_release",
            "limit": 50,
            "since": "2026-01-15T09:30:00.000Z"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "name": "string",
            "slug": "string",
            "limit": 1,
            "changes": [
              {
                "id": 1,
                "release": {
                  "url": "string",
                  "title": "string",
                  "version": "string",
                  "publishedAt": "2026-01-15T09:30:00.000Z"
                },
                "summary": "string",
                "evidence": "string",
                "newValue": "string",
                "changeType": "new_release",
                "detectedAt": "2026-01-15T09:30:00.000Z",
                "previousValue": "string"
              }
            ],
            "hasMore": false,
            "changeCount": 1,
            "releaseCount": 1,
            "watchedSince": "2026-01-15T09:30:00.000Z"
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET"
                ],
                "type": "string"
              },
              "pathParams": {
                "type": "object",
                "required": [
                  "slug"
                ],
                "properties": {
                  "slug": {
                    "type": "string",
                    "example": "openai",
                    "pattern": "^[a-z0-9][a-z0-9-]*$",
                    "maxLength": 64,
                    "minLength": 1,
                    "description": "Vendor slug, lowercase alphanumeric with dashes. Take one from GET /api/monitors and substitute it into the path: `{slug}` is a placeholder, and requesting those literal characters returns 404. Worked example: GET /api/monitors/openai."
                  }
                }
              },
              "queryParams": {
                "type": "object",
                "properties": {
                  "type": {
                    "enum": [
                      "new_release",
                      "version_changed",
                      "date_changed",
                      "title_changed",
                      "breaking_signal"
                    ],
                    "type": "string",
                    "description": "Restrict to a single change type."
                  },
                  "limit": {
                    "type": "integer",
                    "default": 50,
                    "maximum": 200,
                    "minimum": 1,
                    "description": "Maximum number of change rows to return."
                  },
                  "since": {
                    "type": "string",
                    "format": "date-time",
                    "description": "Only return changes detected at or after this instant."
                  }
                }
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "enum": [
                  "json"
                ],
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            },
            "description": "Detected changelog update history (paid)"
          }
        },
        "description": "Call shape for GET /api/monitors/{slug}/changes."
      }
    }
  },
  "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.

0.01USDC≈ $0.01 USD
on Base · exact scheme

Pay 0.01 USDC on Base to 0xb23c…36fc9. The signed payment is good for 2 minutes.

Paid to
0xb23c…36fc9
USD Coin contract
0x8335…02913
Payment window
2 minutes
As published
10000 smallest units
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0xb23c3825de4ca8a479183092ae8d1d58d2736fc9",
    "amount": "10000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 120
  }
]

Provenance

Seen in the source catalog
2026-09-01 00:57Z
Last indexed by Roundhouse
2026-09-24 07:45Z
Last enriched (probe, favicon, geo)
2026-09-14 21:46Z
x402 version
2
Max timeout
120s
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 changelog-state-api.replit.app 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=changelog-state-api.replit.app'
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://changelog-state-api.replit.app/api/monitors/figma/changes, 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.