Truth Bear

Live 402 challenge

Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.

{
  "error": "X-PAYMENT header is required. This endpoint costs $9.90 USDC, above the x402 client default maxValue of $0.10 — raise maxValue to at least 9900000 atomic units, or your own client rejects this payment locally and no request ever reaches us. Do not want to raise it? A cheaper alternative you can run right now: GET /gauge?signal_id=hydrology.river-level&entity=07010000 ($0.01 USDC) - the same official signal plus its offline-recomputable proof - no three-leg chain, one signal only.",
  "rails": {
    "available": [
      "base",
      "solana"
    ],
    "advertised": [
      "base"
    ],
    "optin_hint": "Send \"X-Payment-Network: solana\" (or ?rails=all) to receive every available rail in accepts.",
    "optin_header": "X-Payment-Network",
    "also_advertised_as": {
      "note": "This same 402 is offered twice: the v1 challenge in this body, and a v2 challenge in the PAYMENT-REQUIRED header. They are the SAME offer - identical price, asset and payTo - not two competing ones. Pay with whichever version your client speaks; you do not need both.",
      "rails": "The v2 challenge lists the Solana rail without an opt-in, while this v1 body does not. That is deliberate, not a discrepancy: a v1 network:\"solana\" entry makes some v1 clients reject the WHOLE accepts array, so v1 advertises it only on request. A v2 client matches on solana:5eykt4Us... and is unaffected.",
      "header": "PAYMENT-REQUIRED",
      "naming": "The v2 challenge uses CAIP-2 network ids (eip155:8453, solana:5eykt4Us...) where this v1 body uses the legacy short names (base, solana). Same chains, different identifier scheme - CDP couples the naming to the version, so it cannot be mixed.",
      "encoding": "base64 JSON",
      "x402_version": 2
    }
  },
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x2d16a243ba9fAcC6AC85519d5efad2149DC4C6c3",
      "amount": "9900000",
      "scheme": "exact",
      "network": "base",
      "mimeType": "application/json",
      "resource": "https://aeml-x402.zeabur.app/gauge/subscribe",
      "extensions": {
        "bazaar": {
          "info": {
            "input": {
              "type": "http",
              "method": "GET"
            },
            "output": {
              "type": "json"
            }
          },
          "schema": {
            "$schema": "https://json-schema.org/draft/2020-12/schema",
            "properties": {
              "input": {
                "type": "object",
                "required": [
                  "type",
                  "method"
                ],
                "properties": {
                  "type": {
                    "const": "http"
                  },
                  "method": {
                    "enum": [
                      "GET"
                    ],
                    "type": "string"
                  }
                }
              },
              "output": {
                "type": "object",
                "required": [
                  "type"
                ],
                "properties": {
                  "type": {
                    "const": "json"
                  }
                }
              }
            }
          },
          "priceUsd": "$9.90",
          "discoverable": true,
          "outputSchema": {
            "type": "object",
            "required": [
              "token",
              "expires_at"
            ],
            "properties": {
              "days": {
                "type": "integer",
                "description": "Validity in days"
              },
              "note": {
                "type": "string",
                "description": "How to use it: call /gauge/watch and /gauge/watch-changes with Authorization: Bearer <token> or ?token="
              },
              "plan": {
                "type": "string",
                "description": "Plan code"
              },
              "token": {
                "type": "string",
                "description": "Signed subscription token (stateless HMAC); keep it yourself - no account, no login"
              },
              "nature": {
                "type": "string",
                "description": "Neutrality statement: GAUGE supplies observations and trend description only - no judgement, no prediction, no recommendation"
              },
              "expires_at": {
                "type": "string",
                "format": "date-time",
                "description": "Expiry, ISO-8601"
              }
            },
            "additionalProperties": true,
            "conditionalProperties": {
              "last_fact": {
                "type": [
                  "object",
                  "null"
                ],
                "description": "Most recent qualifying fact for this line and entity, attached centrally (may be absent when the line has no qualifying fact yet)"
              },
              "decision_points": {
                "type": [
                  "object",
                  "null"
                ],
                "description": "Swappable decision points for this entity, attached centrally: {count, points:[{tag,current,swappable,how}], note}. Present only when the entity has at least one swappable tag in the index, so bundles for entities without one omit it"
              },
              "leg_availability": {
                "type": [
                  "object",
                  "null"
                ],
                "description": "Per-leg degradation disclosure: which legs are present, which are degraded and why. Present only when at least one leg is degraded"
              },
              "record_hash_verifiable": {
                "type": [
                  "object",
                  "null"
                ],
                "description": "Whether this response can recompute its own record_hash offline. Present only when the payload carries a top-level record_hash; may be absent on list-shaped deliveries where verifiability is stated per row instead"
              }
            }
          },
          "routeTemplate": "/gauge/subscribe",
          "priceUsdNumber": 9.9
        }
      },
      "description": "[SUBSCRIPTION] Pay once to mint a STATELESS signed token (HMAC - no account, no login, no session, no server-side storage). Send it as Authorization Bearer on /gauge/watch and /gauge/watch-changes to read a batch watchlist without per-call payment. Default validity 30 days. The free tier is unaffected. Priced above the default agent maxValue on purpose - minting a subscription should be a deliberate act, not an accident. $9.90 per call.",
      "outputSchema": {
        "input": {
          "type": "http",
          "method": "GET",
          "required": [],
          "properties": {},
          "queryParams": {},
          "discoverable": true
        },
        "output": {
          "type": "object",
          "required": [
            "token",
            "expires_at"
          ],
          "properties": {
            "days": {
              "type": "integer",
              "description": "Validity in days"
            },
            "note": {
              "type": "string",
              "description": "How to use it: call /gauge/watch and /gauge/watch-changes with Authorization: Bearer <token> or ?token="
            },
            "plan": {
              "type": "string",
              "description": "Plan code"
            },
            "token": {
              "type": "string",
              "description": "Signed subscription token (stateless HMAC); keep it yourself - no account, no login"
            },
            "nature": {
              "type": "string",
              "description": "Neutrality statement: GAUGE supplies observations and trend description only - no judgement, no prediction, no recommendation"
            },
            "expires_at": {
              "type": "string",
              "format": "date-time",
              "description": "Expiry, ISO-8601"
            }
          },
          "additionalProperties": true,
          "conditionalProperties": {
            "last_fact": {
              "type": [
                "object",
                "null"
              ],
              "description": "Most recent qualifying fact for this line and entity, attached centrally (may be absent when the line has no qualifying fact yet)"
            },
            "decision_points": {
              "type": [
                "object",
                "null"
              ],
              "description": "Swappable decision points for this entity, attached centrally: {count, points:[{tag,current,swappable,how}], note}. Present only when the entity has at least one swappable tag in the index, so bundles for entities without one omit it"
            },
            "leg_availability": {
              "type": [
                "object",
                "null"
              ],
              "description": "Per-leg degradation disclosure: which legs are present, which are degraded and why. Present only when at least one leg is degraded"
            },
            "record_hash_verifiable": {
              "type": [
                "object",
                "null"
              ],
              "description": "Whether this response can recompute its own record_hash offline. Present only when the payload carries a top-level record_hash; may be absent on list-shaped deliveries where verifiability is stated per row instead"
            }
          }
        }
      },
      "maxAmountRequired": "9900000",
      "maxTimeoutSeconds": 300
    }
  ],
  "client_hint": {
    "action": "This endpoint costs $9.90 USDC, above the x402 client default maxValue of $0.10. Raise your client maxValue to at least required_atomic; otherwise the payment is rejected locally inside your own client and never reaches this server, so you will see no error from us.",
    "reason": "price_above_default_client_max_value",
    "example": "wrapFetchWithPayment(fetch, account, BigInt(9900000))  // atomic units, USDC 6dp",
    "required_usdc": "9.90",
    "required_atomic": "9900000",
    "within_your_budget": [
      {
        "try": "/gauge?signal_id=hydrology.river-level&entity=07010000",
        "gets": "the same official signal plus its offline-recomputable proof - no three-leg chain, one signal only",
        "path": "/gauge",
        "usdc": "0.01"
      },
      {
        "try": "/shadow/signal-plus?signal_id=hydrology.river-level&entity=07010000&topic=coin",
        "gets": "that same signal and proof plus 48h unverified public-channel chatter, kept in a separate key",
        "path": "/shadow/signal-plus",
        "usdc": "0.09"
      }
    ],
    "default_client_max_atomic": "100000"
  },
  "x402Version": 1
}

Accepts

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

[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x2d16a243ba9facc6ac85519d5efad2149dc4c6c3",
    "amount": "9900000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 30
  },
  {
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "extra": {
      "feePayer": "BFK9TLC3edb13K6v4YyH3DwPb5DSUpkWvb7XnqCL9b4F"
    },
    "payTo": "8qEn3Y3GPXdQ28LHshPa4UYeD8V38Lq9b4jCRirQAY3n",
    "amount": "9900000",
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "maxTimeoutSeconds": 30
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET"
      },
      "output": {
        "type": "json"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "type": "object",
          "required": [
            "type",
            "method"
          ],
          "properties": {
            "type": {
              "const": "http"
            },
            "method": {
              "enum": [
                "GET"
              ],
              "type": "string"
            }
          }
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "const": "json"
            }
          }
        }
      }
    },
    "routeTemplate": "/gauge/subscribe",
    "outputSchemaRef": "/manifest"
  }
}

Provenance

Seen in the source catalog

2026-08-15 03:41Z

Last indexed by Roundhouse

2026-08-26 01:10Z

Last enriched (probe, favicon, geo)

2026-09-23 22:45Z

x402 version

2

Max timeout

30s

Liveness probe

HTTP 404