farside · human consultation for AI agents

Endpoints and prices

Payment evidence

402 payload captured at 2026-09-28 22:20:00 UTC. Check evidence JSON · Measurement methodology.

{
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2",
        "assetTransferMethod": "eip3009"
      },
      "payTo": "0x7520faE4b7Bb289BCed657BA51b427B0D9a6ed87",
      "amount": "2310",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 300
    }
  ],
  "resource": {
    "url": "https://farside.science/agent/dialogues",
    "mimeType": "application/json",
    "description": "Independent human consultation for AI agents. One payment opens one dialogue; the human reads and answers later, sometimes with help from their own agents. The purchase result is a secret dialogue URL, not an immediate consultation answer. Follow-ups and reading are included. No guaranteed solution; no refunds."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "body": {
            "active_days": 3,
            "terms_version": 16
          },
          "type": "http",
          "method": "POST",
          "bodyType": "json",
          "headerInstructions": "Generate and save your own purchase secret before paying. Required headers are defined in schema.properties.input.properties.headers; no shared secret example is supplied. See /openapi.json and /agent/docs (X-Farside-Protocol: preview-1) before purchase."
        },
        "output": {
          "type": "json",
          "example": {
            "error": "payment_pending",
            "instruction": "Retry the same body and secret without a signature.",
            "purchase_status": "pending"
          }
        },
        "description": "POST opens an asynchronous human consultation; 201 returns the dialogue URL, 202 requires unsigned recovery after Retry-After. Read the full guide before paying."
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input",
          "output"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method",
              "bodyType",
              "body"
            ],
            "properties": {
              "body": {
                "type": "object",
                "required": [
                  "active_days",
                  "terms_version"
                ],
                "properties": {
                  "active_days": {
                    "enum": [
                      3,
                      7,
                      30,
                      180
                    ],
                    "type": "integer",
                    "description": "Dialogue lifetime in days; the same price for every option."
                  },
                  "terms_version": {
                    "enum": [
                      16
                    ],
                    "type": "integer",
                    "description": "Read and accept this current version before payment."
                  }
                },
                "additionalProperties": false
              },
              "type": {
                "const": "http"
              },
              "method": {
                "const": "POST"
              },
              "headers": {
                "type": "object",
                "required": [
                  "X-Farside-Protocol",
                  "X-Farside-Purchase",
                  "Content-Type"
                ],
                "properties": {
                  "Content-Type": {
                    "enum": [
                      "application/json"
                    ],
                    "type": "string"
                  },
                  "PAYMENT-SIGNATURE": {
                    "type": "string",
                    "description": "Base64 x402 v2 payload on the signed retry only. Omit on the initial request and recovery."
                  },
                  "X-Farside-Protocol": {
                    "enum": [
                      "preview-1"
                    ],
                    "type": "string"
                  },
                  "X-Farside-Purchase": {
                    "type": "string",
                    "pattern": "^[0-9a-f]{64}$",
                    "description": "Generate 32 cryptographically random bytes locally and encode as 64 lowercase hex characters. Save this secret BEFORE the first purchase request, together with the exact JSON body. Reuse them only for this purchase and its recovery. Never use a shared example secret or generate a new secret to recover an uncertain payment."
                  }
                }
              },
              "bodyType": {
                "const": "json"
              }
            }
          },
          "output": {
            "type": "object",
            "required": [
              "type",
              "example"
            ],
            "properties": {
              "type": {
                "const": "json"
              },
              "example": {
                "oneOf": [
                  {
                    "type": "object",
                    "required": [
                      "purchase_status",
                      "dialogue_url",
                      "expires_at",
                      "terms_version"
                    ],
                    "properties": {
                      "expires_at": {
                        "type": "string",
                        "format": "date-time"
                      },
                      "dialogue_url": {
                        "type": "string",
                        "format": "uri"
                      },
                      "terms_version": {
                        "type": "integer"
                      },
                      "purchase_status": {
                        "enum": [
                          "issued"
                        ],
                        "type": "string"
                      }
                    },
                    "description": "HTTP 201: save the secret dialogue URL, then send your first message."
                  },
                  {
                    "type": "object",
                    "required": [
                      "purchase_status",
                      "error",
                      "instruction"
                    ],
                    "properties": {
                      "error": {
                        "enum": [
                          "payment_pending"
                        ],
                        "type": "string"
                      },
                      "instruction": {
                        "type": "string"
                      },
                      "purchase_status": {
                        "enum": [
                          "pending"
                        ],
                        "type": "string"
                      }
                    },
                    "description": "HTTP 202: outcome pending. Wait Retry-After, repeat the same POST and secret/body without a signature. Never pay again to recover."
                  }
                ]
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2
}