Roundhouse

FastX402 Lab

Computes shortest path between two nodes using Dijkstra's algorithm, performs topological sorting on DAGs, and detects cycles in directed graphs. Input is a JSON graph with nodes and weighted edges.

Dataoffline · HTTP 500eip155:8453Exactvia facilitator:payAI
https://fastx402.tools/graph-shortest-path
Data
Settlements · 30d
232↓ 99%
No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days.
$0.40
Verified settled volume
232 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0020
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
0xFe6Ae9ec9DE12817f23958F11b6CE69194b6Bd7E

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.

0.002USDC≈ $0.002 USD
on Base · exact scheme

Pay 0.002 USDC on Base to 0xFe6A…6Bd7E. The signed payment is good for 5 minutes.

Paid to
0xFe6A…6Bd7E
USD Coin contract
0x8335…02913
Payment window
5 minutes
As published
2000 smallest units
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0xFe6Ae9ec9DE12817f23958F11b6CE69194b6Bd7E",
    "amount": "2000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET",
        "queryParams": {
          "end": "D",
          "graph": "{\"nodes\":[\"A\",\"B\",\"C\",\"D\"],\"edges\":[{\"from\":\"A\",\"to\":\"B\",\"weight\":4},{\"from\":\"A\",\"to\":\"C\",\"weight\":2},{\"from\":\"C\",\"to\":\"B\",\"weight\":1},{\"from\":\"B\",\"to\":\"D\",\"weight\":5},{\"from\":\"C\",\"to\":\"D\",\"weight\":8}]}",
          "start": "A",
          "operation": "shortest_path"
        }
      },
      "output": {
        "type": "json",
        "example": {
          "end": "D",
          "path": [
            "A",
            "C",
            "B",
            "D"
          ],
          "start": "A",
          "distance": 8,
          "operation": "shortest_path"
        }
      }
    },
    "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",
              "required": [
                "graph",
                "operation"
              ],
              "properties": {
                "end": {
                  "type": "string",
                  "description": "Ending node (required for shortest_path)"
                },
                "graph": {
                  "type": "string",
                  "description": "JSON string with 'nodes' array and 'edges' array (each edge has 'from', 'to', and optional 'weight' defaulting to 1)"
                },
                "start": {
                  "type": "string",
                  "description": "Starting node (required for shortest_path)"
                },
                "operation": {
                  "type": "string",
                  "description": "One of: 'shortest_path' (Dijkstra), 'topological_sort' (for DAG), 'detect_cycle'"
                }
              }
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "type": "object",
              "properties": {
                "end": {
                  "type": "string"
                },
                "path": {
                  "type": "array",
                  "items": {
                    "type": "string"
                  }
                },
                "start": {
                  "type": "string"
                },
                "distance": {
                  "type": "integer"
                },
                "operation": {
                  "type": "string"
                }
              }
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-10-18 12:25Z
Last indexed by Roundhouse
2026-10-26 21:16Z
Last enriched (probe, favicon, geo)
2026-10-18 19:45Z
x402 version
2
Max timeout
300s
Liveness probe
HTTP 500
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 FastX402 Lab 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=FastX402%20Lab'
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://fastx402.tools/graph-shortest-path, 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. Either pay over x402 (mint a personal key for $0.01 at
GET https://api.roundhouseai.io/v0/test/x402), or ask me for an organization key, which I create at
https://roundhouseai.io/dashboard/connections. If you have neither, ask before going further.

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