AI Inference · x402 · early usage

Live valuations for private, pre-IPO companies — Anthropic, OpenAI, SpaceX, Anduril, Ne…

Live valuations for private, pre-IPO companies — Anthropic, OpenAI, SpaceX, Anduril, Neuralink, Kalshi, Polymarket — in one call, via PreStocks Solana tokens backed 1:1 by SPV exposure. Per company: mark price and valuation, on-chain token price and implied v…

by x402stock.xyz · discovered, not yet claimed by its owner · updated 2026-10-09

30d calls4

30d payers3

MethodGET

Outputjson

Mirrored from Coinbase's public x402 Bazaar. The description is the provider's own text and has not been reviewed here; the payment requirements are copied as published.

What it does

Tags: bazaar

Call contract

Method: GET
Input: query parameters
Output: json
Last paid call: 2026-10-09

Input example from Bazaar metadata

{}

Output example

{
  "as_of": "2026-06-06T00:27:47.493Z",
  "attribution": "Source: PreStocks (prestocks.com) — Solana tokens backed 1:1 by SPV exposure to the underlying private company",
  "companies": [
    {
      "contract_address": "PresTj4Yc2bAR197Er7wz4UUKSfqt6FryBEdAriBoQB",
      "description": "Anduril builds AI-driven defense systems, including autonomous drones and perimeter sensors. Their platforms integrate real-time data and computer vision to enhance situational awareness for military and border security applications.\n\nANDURIL is a PreStocks issued token backed 1:1 by SPV exposure that tracks the price of the underlying private company.",
      "implied_valuation": 99947316150,
      "logo_url": "https://www.prestocks.com/logos/anduril.png",
      "mark_price": 127.64,
      "mark_valuation": 103744703531,
      "name": "Anduril PreStocks",
      "supply": 14390.747182,
      "symbol": "ANDURIL",
      "token_premium_percent": -3.66,
      "token_price": 122.968,
      "url": "https://www.prestocks.com/anduril"
    },
    {
      "contract_address": "Pren1FvFX6J3E4kXhJuCiAD5aDmGEb7qJRncwA8Lkhw",
      "description": "Anthropic is an AI research company developing Claude, a language model built with a strong focus on safety and interpretability. Their approach emphasizes ethical guardrails and transparent behavior to reduce the risk of harmful outputs while enabling sophisticated natural language capabilities.\n\nANTHROPIC is a PreStocks issued token backed 1:1 by SPV exposure that tracks the price of the underlying private company.",
      "implied_valuation": 1476877462885,
      "logo_url": "https://www.prestocks.com/logos/anthropic.png",
      "mark_price": 1023.25,
      "mark_valuation": 1676433761736,
      "name": "Anthropic PreStocks",
      "supply": 9554.916082,
      "symbol": "ANTHROPIC",
      "token_premium_percent": -11.9,
      "token_price": 901.4462,
      "url": "https://www.prestocks.com/anthropic"
    },
    {
      "contract_address": "PreLWGkkeqG1s4HEfFZSy9moCrJ7btsHuUtfcCeoRua",
      "description": "Kalshi is a CFTC-regulated prediction market where users trade event contracts on real-world outcomes. Contract prices reflect implied probabilities for events across politics, economics, sports, and more.\n\nKALSHI is a PreStocks issued token backed 1:1 by SPV exposure that tracks the price of the underlying private company.",
      "implied_valuation": 18389542280,
      "logo_url": "https://www.prestocks.com/logos/kalshi.png",
      "mark_price": 604.24,
      "mark_valuation": 21708276177,
      "name": "Kalshi PreStocks",
      "supply": 1476.997906,
      "symbol": "KALSHI",
      "token_premium_percent": -15.29,
      "token_price": 511.8646,
      "url": "https://www.prestocks.com/kalshi"
    },
    {
      "contract_address": "PrekqLJvJ3qVdXmBGDiexvwUTF4rLFDa6HWS4HJbw9S",
      "description": "Neuralink develops implantable brain-computer interfaces designed to enable direct communication between the human brain and computers. Their technology aims to treat neurological conditions and eventually augment human capabilities.\n\nNEURALINK is a PreStocks issued token backed 1:1 by SPV exposure that tracks the price of the underlying private company.",
      "implied_valuation": 57348355821,
      "logo_url": "https://www.prestocks.com/logos/neuralink.png",
      "mark_price": 282.23,
      "mark_valuation": 53931079208,
      "name": "Neuralink PreStocks",
      "supply": 4995.999226,
      "symbol": "NEURALINK",
      "token_premium_percent": 6.34,
      "token_price": 300.1132,
      "url": "https://www.prestocks.com/neuralink"
    },
    {
      "contract_address": "PreweJYECqtQwBtpxHL171nL2K6umo692gTm7Q3rpgF",
      "description": "OpenAI pioneers large-language models like GPT and DALL·E, enabling advanced AI applications. Their research emphasizes both cutting-edge capability and responsible deployment strategies.\n\nOPENAI is a PreStocks issued token backed 1:1 by SPV exposure that tracks the price of the underlying private company.",
      "implied_valuation": 1110401674929,
      "logo_url": "https://www.prestocks.com/logos/openai.png",
      "mark_price": 1527.04,
      "mark_valuation": 1273031389432,
      "name": "OpenAI PreStocks",
      "supply": 2002.908181,
      "symbol": "OPENAI",
      "token_premium_percent": -12.77,
      "token_price": 1331.9607,
      "url": "https://www.prestocks.com/openai"
    },
    {
      "contract_address": "Pre8AREmFPtoJFT8mQSXQLh56cwJmM7CFDRuoGBZiUP",
      "description": "Polymarket is a decentralized prediction market for real-world events. It leverages blockchain technology and market-driven pricing to provide real-time implied probabilities across politics, economics, sports, and more.\n\nPOLYMARKET is a PreStocks issued token backed 1:1 by SPV exposure that tracks the price of the underlying private company.",
      "implied_valuation": 12821691278,
      "logo_url": "https://www.prestocks.com/logos/polymarket.png",
      "mark_price": 147.94,
      "mark_valuation": 12844491607,
      "name": "Polymarket PreStocks",
      "supply": 4818.988067,
      "symbol": "POLYMARKET",
      "token_premium_percent": -0.18,
      "token_price": 147.6774,
      "url": "https://www.prestocks.com/polymarket"
    },
    {
      "contract_address": "PreANxuXjsy2pvisWWMNB6YaJNzr7681wJJr2rHsfTh",
      "description": "SpaceX engineers reusable launch vehicles and the Starlink satellite constellation for global broadband. Their focus on rapid reusability and vertical integration drives down launch costs and accelerates space access.\n\nSPACEX is a PreStocks issued token backed 1:1 by SPV exposure that tracks the price of the underlying private company.",
      "implied_valuation": 1838317496767,
      "logo_url": "https://www.prestocks.com/logos/spacex.png",
      "mark_price": 795.49,
      "mark_valuation": 2085951555556,
      "name": "SpaceX PreStocks",
      "supply": 8742.928256,
      "symbol": "SPACEX",
      "token_premium_percent": -11.87,
      "token_price": 701.0533,
      "url": "https://www.prestocks.com/spacex"
    }
  ],
  "count": 7,
  "source": "x402stock",
  "venue": "prestocks"
}

Use with an agent

Discover. Agents find this listing with GET https://bazaar.saylorinnovations.com/discovery/search?query=…, the MCP tool search_resources, or /discovery/resources.
Inspect. Fetch /resources/39934.json for the price and payment options.
Pay. Call GET https://x402stock.xyz/api/v1/private-stocks. The provider answers 402 with its payment requirements. An x402 client signs one of the options below and retries with PAYMENT-SIGNATURE.
Execute. The provider returns 200 with the data. Agent Bazaar is not in the request path and never sees your payment.

For humans

You don't need an account or an API key; you need a wallet holding a small amount of USDC on Base, and an x402-capable client (see the examples below). Call the endpoint unpaid first to see exactly what it asks for.

Pricing & payment

Price: $0.02 / request
Protocol: x402 v2
Auth: No account or API key. Pay per request.
Networks: Base
Demand: 4 calls · 3 unique payers in 30d (public x402 Bazaar data)

x402 payment requirements

Scheme	Network	Asset	Amount	Pay to	Timeout
exact	Base eip155:8453	USDC	$0.02	0x3070Fbb3803819fB5BdfE9286fdc6325A877fA85	300s

accepts[] (raw JSON)

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x3070Fbb3803819fB5BdfE9286fdc6325A877fA85",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "20000",
    "amountUsd": 0.02,
    "maxTimeoutSeconds": 300
  }
]

Schemas

Output schema (JSON Schema)

{
  "properties": {
    "example": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "additionalProperties": false,
      "properties": {
        "as_of": {
          "description": "ISO 8601 timestamp when this response was generated.",
          "type": "string"
        },
        "attribution": {
          "description": "Required source-attribution string; pass through to end users.",
          "type": "string"
        },
        "companies": {
          "description": "Every PreStocks private company, most-valuable first.",
          "items": {
            "additionalProperties": false,
            "properties": {
              "contract_address": {
                "anyOf": [
                  {
                    "type": "string"
                  },
                  {
                    "type": "null"
                  }
                ],
                "description": "Solana mint address of the PreStocks SPV token."
              },
              "description": {
                "description": "Plain-language overview of the underlying private company, plus the token's 1:1 SPV-backing note.",
                "type": "string"
              },
              "implied_valuation": {
                "anyOf": [
                  {
                    "type": "number"
                  },
                  {
                    "type": "null"
                  }
                ],
                "description": "Company valuation in USD implied by the on-chain token_price."
              },
              "logo_url": {
                "anyOf": [
                  {
                    "type": "string"
                  },
                  {
                    "type": "null"
                  }
                ],
                "description": "Company logo image URL."
              },
              "mark_price": {
                "anyOf": [
                  {
                    "type": "number"
                  },
                  {
                    "type": "null"
                  }
                ],
                "description": "SPV mark price per token in USD — the underlying private company's marked value. NOT a last-trade price."
              },
              "mark_valuation": {
                "anyOf": [
                  {
                    "type": "number"
                  },
                  {
                    "type": "null"
                  }
                ],
                "description": "Company valuation in USD implied by the SPV mark (mark_price basis)."
              },
              "name": {
                "description": "PreStocks token name, e.g. 'Anthropic PreStocks'.",
                "type": "string"
              },
              "supply": {
                "anyOf": [
                  {
                    "type": "number"
                  },
                  {
                    "type": "null"
                  }
                ],
                "description": "Circulating token supply."
              },
              "symbol": {
                "description": "PreStocks token symbol, e.g. ANTHROPIC, OPENAI, SPACEX. Use as the {symbol} path param.",
                "type": "string"
              },
              "token_premium_percent": {
                "anyOf": [
                  {
                    "type": "number"
                  },
                  {
                    "type": "null"
                  }
                ],
                "description": "token_price vs mark_price, in percent. Positive = token trades at a premium to the SPV mark; negative = discount."
              },
              "token_price": {
                "anyOf": [
                  {
                    "type": "number"
                  },
                  {
                    "type": "null"
                  }
                ],
                "description": "Current on-chain token trading price in USD. Can diverge from mark_price — that gap is the premium/discount."
              },
              "url": {
                "anyOf": [
                  {
                    "type": "string"
                  },
                  {
                    "type": "null"
                  }
                ],
                "description": "PreStocks company page URL."
              }
            },
            "required": [
              "symbol",
              "name",
              "description",
              "mark_price",
              "mark_valuation",
              "token_price",
              "implied_valuation",
              "token_premium_percent",
              "supply",
              "contract_address",
              "logo_url",
              "url"
            ],
            "type": "object"
          },
          "type": "array"
        },
        "count": {
          "description": "Number of companies in `companies`.",
          "type": "number"
        },
        "source": {
          "const": "x402stock",
          "type": "string"
        },
        "venue": {
          "description": "Issuing venue for the tokens — always 'prestocks'.",
          "type": "string"
        }
      },
      "required": [
        "source",
        "as_of",
        "venue",
        "count",
        "companies",
        "attribution"
      ],
      "type": "object"
    },
    "type": {
      "type": "string"
    }
  },
  "required": [
    "type"
  ],
  "type": "object"
}

Example shape — generated from the schema, not a captured live response

{
  "example": {
    "as_of": "string",
    "attribution": "string",
    "companies": [
      {
        "contract_address": null,
        "description": "string",
        "implied_valuation": null,
        "logo_url": null,
        "mark_price": null,
        "mark_valuation": null,
        "name": "string",
        "supply": null,
        "symbol": "string",
        "token_premium_percent": null,
        "token_price": null,
        "url": null
      }
    ],
    "count": 0,
    "source": "string",
    "venue": "string"
  },
  "type": "string"
}

Examples

curl

curl "https://x402stock.xyz/api/v1/private-stocks"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://x402stock.xyz/api/v1/private-stocks");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

Python

import httpx
res = httpx.get("https://x402stock.xyz/api/v1/private-stocks")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header

Details

Provider: x402stock.xyz
Endpoint: https://x402stock.xyz/api/v1/private-stocks
Machine-readable: /resources/39934.json