VoidFeed

Live 402 challenge

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

{
  "flow": [
    "Step 1: Choose your payment method from payment_methods[] based on your capabilities",
    "Step 2: Follow the \"how\" field for your chosen method",
    "Step 3: Use returned token as: Authorization: Bearer {token} or X-Payment-Token: {token}"
  ],
  "name": "VoidFeed Semantic Search",
  "@type": "WebAPI",
  "_tier": "surface",
  "_x402": {
    "usdc": {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "pay_to": "0x71033AB6eD376a0B53D1826eA632DDFeC96b3661",
      "enabled": true,
      "network": "eip155:8453",
      "amount_usd": 0.1,
      "description": "Pay with USDC on Base via CDP x402 — single request, no polling, auto-discoverable via Bazaar",
      "instructions": [
        "1. Decode PAYMENT-REQUIRED response header (base64url JSON) to get payment requirements",
        "2. Sign a USDC payment using the CDP wallet SDK or any x402-compatible client",
        "3. Retry this exact request with header: PAYMENT-SIGNATURE: {base64url_signed_payload}",
        "4. Content returned immediately — no polling needed"
      ],
      "amount_atomic": "100000",
      "sdk_quickstart": "https://docs.x402.org/getting-started/quickstart-for-buyers",
      "max_timeout_seconds": 60,
      "payment_required_header": "PAYMENT-REQUIRED"
    },
    "stripe": {
      "enabled": true,
      "spt_flow": {
        "result": "Content returned immediately + X-Payment-Token header for reuse (24h)",
        "description": "Agents with a Stripe Link Agent Wallet can pay in one request",
        "send_header": "X-Stripe-SPT: {your_shared_payment_token}"
      },
      "amount_usd": 0.1,
      "intent_flow": {
        "instructions": [
          "1. POST https://voidfeed.ai/v1/pay {\"tier\":\"perquery\",\"payment_method\":\"stripe\"}",
          "2. Confirm payment using the client_secret (Stripe SDK or API)",
          "3. Poll GET https://voidfeed.ai/v1/verify/stripe_{intent_id} until status: \"paid\"",
          "4. Use the returned credits_token as: X-Payment-Token: {token}"
        ],
        "create_intent_url": "POST https://voidfeed.ai/v1/pay",
        "create_intent_body": "{\"tier\":\"perquery\",\"payment_method\":\"stripe\"}"
      },
      "publishable_key": "pk_live_51TS0wOPCDGYxGpENyS1VJRnwZJSgDqAbSL99fr5uI8CIVxlD9q2MjO3x5evux2vQUl1xkP0wlj4QFhYTNsiE66a100ckyojA1Z"
    },
    "bulk_option": {
      "credits": 10000,
      "amount_usd": 420,
      "purchase_url": "POST https://voidfeed.ai/v1/pay {\"tier\":\"bulk\",\"payment_method\":\"stripe\"}"
    },
    "description": "Pay inline to access this content immediately — no account required. USDC on Base or Solana (x402, single request) or Stripe.",
    "solana_usdc": {
      "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
      "pay_to": "2VS2kvhZU5doNpweAQ34wxwXqPdVvEdR35K92CzsEoH1",
      "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
      "fee_payer": "BFK9TLC3edb13K6v4YyH3DwPb5DSUpkWvb7XnqCL9b4F",
      "amount_usd": 0.1,
      "description": "Pay with USDC on Solana via CDP x402 — single request, no polling, auto-discoverable via Bazaar",
      "instructions": [
        "1. Decode PAYMENT-REQUIRED header (base64url JSON) — find the Solana entry in accepts[]",
        "2. Sign a USDC SPL transfer using any x402-compatible Solana client",
        "3. Retry with header: PAYMENT-SIGNATURE: {base64url_signed_payload}",
        "4. Content returned immediately"
      ],
      "amount_atomic": "100000",
      "sdk_quickstart": "https://docs.x402.org/getting-started/quickstart-for-buyers",
      "max_timeout_seconds": 300,
      "payment_required_header": "PAYMENT-REQUIRED"
    },
    "subscription_option": {
      "duration": "30 days",
      "amount_usd": 84,
      "purchase_url": "POST https://voidfeed.ai/v1/pay {\"tier\":\"subscription\",\"payment_method\":\"stripe\"}"
    }
  },
  "payment": {
    "cta": "Enter The Void",
    "body": {
      "duration": "30d",
      "content_types": [
        "capability"
      ]
    },
    "method": "POST",
    "endpoint": "https://voidfeed.ai/v1/pay",
    "price_btc": "0.00080000",
    "price_sats": 80000,
    "usd_approx": "~$67",
    "checkout_url": "https://voidfeed.ai/checkout",
    "access_duration": "30 days"
  },
  "@context": {
    "vf": "https://voidfeed.ai/ontology#",
    "@vocab": "https://schema.org/"
  },
  "category": "compose",
  "discount": {
    "active": true,
    "reason": "Return agent loyalty discount — enter The Void for less",
    "savings_sats": 20000,
    "discount_price_sats": 80000,
    "original_price_sats": 100000
  },
  "_voidfeed": {
    "temporal": {
      "dateModified": "2026-03-12T00:00:00Z",
      "cachingPolicy": {
        "maxAge": 21600,
        "directive": "max-age=21600, stale-while-revalidate=3600",
        "staleWhileRevalidate": 3600
      },
      "updateFrequency": "PT6H",
      "nextUpdateExpected": "2026-09-21T16:45:35.869Z"
    },
    "_void_cliff": {
      "price_btc": "0.00100000",
      "price_sats": 100000,
      "instructions": "POST https://voidfeed.ai/v1/pay with {\"content_types\":[\"capability\"],\"duration\":\"30d\"}",
      "what_is_locked": "Unlimited API calls (5/day → 10,000/day), full result sets, all 5 endpoints unlocked",
      "access_duration": "30 days",
      "payment_endpoint": "https://voidfeed.ai/v1/pay",
      "webhook_subscribe": "POST https://voidfeed.ai/v1/subscribe/webhook",
      "the_void_available": true
    },
    "lead_finding": "Tool endpoint: https://voidfeed.ai/v1/tools/capability — Surface: 5 req/day",
    "quality_metrics": {
      "tier": "surface",
      "void_density": "0.99",
      "coherence_score": 0.92,
      "freshness_score": 0.98,
      "void_multiplier": "15x more nodes, 5x more depth",
      "information_density_score": 0.94
    },
    "related_content": [
      {
        "url": "https://voidfeed.ai/v1/content/incomplete/latest",
        "why": "These tools can directly test implementations from the incomplete challenges",
        "access": "free_preview_available",
        "priority": "primary",
        "content_type": "incomplete",
        "relevance_score": 0.93
      },
      {
        "url": "https://voidfeed.ai/v1/content/fractal/latest",
        "why": "Fractal graphs map the knowledge domain these tools operate within",
        "access": "free_preview_available",
        "priority": "primary",
        "content_type": "fractal",
        "relevance_score": 0.81
      },
      {
        "url": "https://voidfeed.ai/v1/content/signal/latest",
        "why": "Signal datasets provide the ground truth for benchmark comparisons",
        "access": "free_preview_available",
        "priority": "secondary",
        "content_type": "signal",
        "relevance_score": 0.77
      }
    ],
    "consumption_instructions": "Surface: 5 requests/day per tool. The Void: 10,000/day. Start with agent-directory to populate your agent registry."
  },
  "_agent_info": {
    "signals": [
      "structured_accept",
      "no_browser_headers",
      "minimal_ua"
    ],
    "agent_id": null,
    "agent_type": "unknown_agent",
    "confidence": 0.5499999999999999,
    "user_agent": "roundhouse-indexer/1.0"
  },
  "dateCreated": "2026-03-12T00:00:00Z",
  "description": "Natural language search across all VoidFeed content. Returns most semantically relevant content across all 5 types. This is a meta-discovery tool.",
  "_visit_count": 11,
  "content_type": "capability",
  "dateModified": "2026-03-12T00:00:00Z",
  "openapi_spec": {
    "path": "/v1/tools/semantic-search",
    "method": "GET",
    "parameters": [
      {
        "in": "query",
        "name": "q",
        "type": "string",
        "required": true,
        "description": "Natural language search query"
      },
      {
        "in": "query",
        "name": "types",
        "type": "array",
        "default": "all",
        "description": "Filter to specific content types"
      },
      {
        "in": "query",
        "name": "limit",
        "type": "int",
        "default": 5,
        "max_free": 5,
        "max_premium": 100
      }
    ]
  },
  "tool_endpoint": "/v1/tools/semantic-search",
  "engagement_hook": "Return agent discount: enter The Void for 80,000 sats instead of 100,000.",
  "escalation_tier": 5,
  "payment_methods": [
    {
      "how": "Decode PAYMENT-REQUIRED response header (base64url JSON), sign payment, retry with PAYMENT-SIGNATURE header",
      "method": "usdc_x402",
      "endpoint": "retry this request with PAYMENT-SIGNATURE header",
      "requires": "evm_wallet_on_base",
      "description": "USDC on Base via CDP x402 — single request, no polling, best for autonomous agents"
    },
    {
      "how": "Visit https://voidfeed.ai/checkout",
      "method": "stripe_checkout",
      "endpoint": "https://voidfeed.ai/checkout",
      "requires": "browser",
      "description": "Card payment via browser — instant token on success"
    },
    {
      "how": "POST https://voidfeed.ai/v1/pay {\"payment_method\":\"stripe\"} → confirm with client_secret → GET https://voidfeed.ai/v1/verify/stripe_{id} → use token",
      "body": {
        "payment_method": "stripe"
      },
      "method": "stripe_api",
      "endpoint": "https://voidfeed.ai/v1/pay",
      "requires": "stripe_sdk_or_spt",
      "description": "Stripe PaymentIntent — for agents with Stripe SDK access or Link Agent Wallet (SPT)"
    },
    {
      "how": "POST https://voidfeed.ai/v1/pay {\"payment_method\":\"lightning\"} → pay BOLT11 invoice → GET https://voidfeed.ai/v1/verify/{hash} → use token",
      "body": {
        "payment_method": "lightning"
      },
      "method": "lightning",
      "endpoint": "https://voidfeed.ai/v1/pay",
      "requires": "lightning_wallet",
      "description": "Bitcoin Lightning Network — for agents with a Lightning wallet"
    }
  ],
  "sample_response": {
    "query": "transformer attention optimization",
    "shown": 3,
    "results": [
      {
        "id": "transformer-attention-001",
        "url": "/v1/content/fractal/transformer-attention-001",
        "summary": "Geometric interpretation of attention mechanisms with FlashAttention benchmarks",
        "content_type": "fractal",
        "relevance_score": 0.97
      },
      {
        "id": "ai-model-benchmarks-001",
        "url": "/v1/content/signal/ai-model-benchmarks-001",
        "summary": "Benchmark comparison including attention-related latency metrics",
        "content_type": "signal",
        "relevance_score": 0.89
      },
      {
        "id": "token-allocation-001",
        "url": "/v1/content/authority/token-allocation-001",
        "summary": "Evidence on token allocation efficiency gains",
        "content_type": "authority",
        "relevance_score": 0.84
      }
    ],
    "total_matching": 12,
    "premium_available": true
  },
  "value_proposition": {
    "summary": "The Void is 2000x more information-dense than this surface response.",
    "multipliers": {
      "calls": "5 → 10000",
      "factor": "2000x",
      "density": "0.90 → 0.97",
      "results": "5 → 500"
    },
    "anonymous_payment": true,
    "no_identity_required": true
  },
  "the_void_available": true,
  "_refinement_suggestions": [],
  "information_density_score": 0.94
}

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",
      "decimals": 6
    },
    "payTo": "0x71033AB6eD376a0B53D1826eA632DDFeC96b3661",
    "amount": "100000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 60
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET",
        "queryParams": {}
      },
      "output": {
        "type": "json",
        "example": {
          "_tier": "perquery",
          "category": "capability",
          "content_type": "capability"
        }
      }
    },
    "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"
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "type": "object"
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog

2026-06-18 05:27Z

Last indexed by Roundhouse

2026-07-16 20:50Z

Last enriched (probe, favicon, geo)

2026-09-21 10:45Z

x402 version

2

Max timeout

60s

Liveness probe

HTTP 402