Roundhouse

x402-seller-playbook

The seller's playbook for a live x402 endpoint: the exact 402 challenge to serve (v2 header and v1 body in one response), what the facilitator /verify really checks and the balance rule that rejects a valid signature, how a settled payment becomes a delivery, delivery evidence in three independent records, how to get listed where agent buyers search, and a plain-USDC page for human buyers who will never read a 402. Delivered as the full text plus a signed, expiring PDF download link. One GET, one delivery, no live upstream call, and the free sample at /guide/sample carries the whole protocol before you pay. The same playbook also covers the receiving side: USDC on Base with no account, no KYC and no third party between you and the buyer. A purchase is two calls by design: this first call returns 402 with the price and the payment terms, and you then repeat the same request with the PAYMENT-SIGNATURE header to receive the 200 delivery.

SearchLiveeip155:8453Exactvia facilitator:payAI
https://x402-catalog-history.ai-business-surface.workers.dev/guide
x402SellerPlaybookUsdcCloudflare-workers
Settlements · 30d
69↓ 71%
No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days.
$0.99
Verified settled volume
69 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
0x6f60659390aDA1D02B14024d8c9d0C889f2F89c3

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",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x6f60659390aDA1D02B14024d8c9d0C889f2F89c3",
      "scheme": "exact",
      "network": "base",
      "mimeType": "application/json",
      "resource": "https://x402-catalog-history.ai-business-surface.workers.dev/guide",
      "description": "The seller's playbook for a live x402 endpoint: the exact 402 challenge to serve (v2 header and v1 body in one response), what the facilitator /verify really checks and the balance rule that rejects a valid signature, how a settled payment becomes a delivery, delivery evidence in three independent records, how to get listed where agent buyers search, and a plain-USDC page for human buyers who will never read a 402. Delivered as the full text plus a signed, expiring PDF download link. One GET, one delivery, no live upstream call, and the free sample at /guide/sample carries the whole protocol before you pay. The same playbook also covers the receiving side: USDC on Base with no account, no KYC and no third party between you and the buyer. A purchase is two calls by design: this first call returns 402 with the price and the payment terms, and you then repeat the same request with the PAYMENT-SIGNATURE header to receive the 200 delivery.",
      "maxAmountRequired": "250000",
      "maxTimeoutSeconds": 60
    }
  ],
  "resource": {
    "url": "https://x402-catalog-history.ai-business-surface.workers.dev/guide",
    "tags": [
      "x402",
      "seller",
      "playbook",
      "usdc",
      "cloudflare-workers"
    ],
    "mimeType": "application/json",
    "description": "The seller's playbook for a live x402 endpoint: the exact 402 challenge to serve (v2 header and v1 body in one response), what the facilitator /verify really checks and the balance rule that rejects a valid signature, how a settled payment becomes a delivery, delivery evidence in three independent records, how to get listed where agent buyers search, and a plain-USDC page for human buyers who will never read a 402. Delivered as the full text plus a signed, expiring PDF download link. One GET, one delivery, no live upstream call, and the free sample at /guide/sample carries the whole protocol before you pay. The same playbook also covers the receiving side: USDC on Base with no account, no KYC and no third party between you and the buyer. A purchase is two calls by design: this first call returns 402 with the price and the payment terms, and you then repeat the same request with the PAYMENT-SIGNATURE header to receive the 200 delivery.",
    "serviceName": "x402-seller-playbook"
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET"
        },
        "output": {
          "type": "json",
          "example": {
            "latest": {
              "catalog.resources": {
                "totalResources": 19325
              }
            },
            "period": {
              "last_observed_at": "2026-10-11T14:45:39.239Z",
              "first_observed_at": "2026-10-11T12:31:51.688Z"
            },
            "changes": [
              {
                "changes": [],
                "target_id": "catalog.resources",
                "observed_at": "2026-10-11T14:45:38.498Z",
                "change_status": "changed"
              }
            ],
            "snapshot": {
              "id": "snap-0000000000000000",
              "kind": "fixed_snapshot",
              "cycles": 56
            },
            "product_id": "x402-catalog-history"
          }
        }
      },
      "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"
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 1,
  "payment_required_v2": {
    "error": "payment_required",
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0x6f60659390aDA1D02B14024d8c9d0C889f2F89c3",
        "amount": "250000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 60
      }
    ],
    "resource": {
      "url": "https://x402-catalog-history.ai-business-surface.workers.dev/guide",
      "tags": [
        "x402",
        "seller",
        "playbook",
        "usdc",
        "cloudflare-workers"
      ],
      "mimeType": "application/json",
      "description": "The seller's playbook for a live x402 endpoint: the exact 402 challenge to serve (v2 header and v1 body in one response), what the facilitator /verify really checks and the balance rule that rejects a valid signature, how a settled payment becomes a delivery, delivery evidence in three independent records, how to get listed where agent buyers search, and a plain-USDC page for human buyers who will never read a 402. Delivered as the full text plus a signed, expiring PDF download link. One GET, one delivery, no live upstream call, and the free sample at /guide/sample carries the whole protocol before you pay. The same playbook also covers the receiving side: USDC on Base with no account, no KYC and no third party between you and the buyer. A purchase is two calls by design: this first call returns 402 with the price and the payment terms, and you then repeat the same request with the PAYMENT-SIGNATURE header to receive the 200 delivery.",
      "serviceName": "x402-seller-playbook"
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "type": "http",
            "method": "GET"
          },
          "output": {
            "type": "json",
            "example": {
              "latest": {
                "catalog.resources": {
                  "totalResources": 19325
                }
              },
              "period": {
                "last_observed_at": "2026-10-11T14:45:39.239Z",
                "first_observed_at": "2026-10-11T12:31:51.688Z"
              },
              "changes": [
                {
                  "changes": [],
                  "target_id": "catalog.resources",
                  "observed_at": "2026-10-11T14:45:38.498Z",
                  "change_status": "changed"
                }
              ],
              "snapshot": {
                "id": "snap-0000000000000000",
                "kind": "fixed_snapshot",
                "cycles": 56
              },
              "product_id": "x402-catalog-history"
            }
          }
        },
        "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"
                }
              },
              "additionalProperties": false
            },
            "output": {
              "type": "object",
              "required": [
                "type"
              ],
              "properties": {
                "type": {
                  "type": "string"
                }
              }
            }
          }
        }
      }
    },
    "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 0x6f60…F89c3. The signed payment is good for 1 minute.

Paid to
0x6f60…F89c3
USD Coin contract
0x8335…02913
Payment window
1 minute
As published
10000 smallest units
The catalog’s raw entry
[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x6f60659390aDA1D02B14024d8c9d0C889f2F89c3",
    "amount": "10000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 60
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET"
      },
      "output": {
        "type": "json",
        "example": {
          "latest": {
            "catalog.resources": {
              "totalResources": 19325
            }
          },
          "period": {
            "last_observed_at": "2026-10-11T14:45:39.239Z",
            "first_observed_at": "2026-10-11T12:31:51.688Z"
          },
          "changes": [
            {
              "changes": [],
              "target_id": "catalog.resources",
              "observed_at": "2026-10-11T14:45:38.498Z",
              "change_status": "changed"
            }
          ],
          "snapshot": {
            "id": "snap-0000000000000000",
            "kind": "fixed_snapshot",
            "cycles": 56
          },
          "product_id": "x402-catalog-history"
        }
      }
    },
    "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"
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog
2026-10-14 02:26Z
Last indexed by Roundhouse
2026-10-26 21:16Z
Last enriched (probe, favicon, geo)
2026-10-14 04:16Z
x402 version
2
Max timeout
60s
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 x402-seller-playbook 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=x402-seller-playbook'
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://x402-catalog-history.ai-business-surface.workers.dev/guide, 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.