ByKaranteli

ByKaranteli X402 API

Per-call priced history and depth endpoints, settled in USDC over the x402 protocol on Solana and Base mainnet through the Coinbase CDP facilitator. 13 priced endpoints plus the free catalog at /api/x402, which is the authoritative price list. Verified 2026-08-11: the catalog lists 13 endpoints from $0.002 to $0.010, and a priced endpoint returns HTTP 402. These sell depth and history, never access.

GitHub OpenAPI

Operations 14

GET /api/x402 Free machine-readable catalog of the paid endpoints #
GET /api/x402/liqmap-levels Full multi-exchange liquidation map snapshot for a Binance USDT-M perp: modeled… #
GET /api/x402/options-flow BTC or ETH options tape depth from recorded Deribit flow: daily premium-flow… #
GET /api/x402/flow-vpin Order flow toxicity (VPIN) history for BTC, ETH and SOL: 90-day daily track… #
GET /api/x402/premium-history Daily Coinbase premium history: the Coinbase versus offshore price spread per… #
GET /api/x402/cot-history Full CFTC Commitments of Traders weekly history for crypto futures: dealer… #
GET /api/x402/liquidations-raw Individual liquidation events recorded from our own exchange sockets across… #
GET /api/x402/oi-history Five minute open interest history for the major perpetuals in base units and… #
GET /api/x402/funding-history Settled funding rate history per symbol and venue, the series behind carry and… #
GET /api/x402/options-oi-history Daily listed options open interest per instrument: strike, expiry, option type… #
GET /api/x402/dvol-history Daily implied volatility index history for BTC and ETH going back to 2021, the… #
GET /api/x402/slippage-history Hourly recorded execution slippage ladders per symbol: what a given order size… #
GET /api/x402/listings-history Perpetual listing and delisting events across six exchanges with first seen… #
GET /api/x402/spot-microstructure Minute bars with the taker buy versus total quote volume split, pre-joined… #

Documentation

📖
Documentation
https://bykaranteli.com/developers

Specifications

⚙
OpenAPI
https://raw.githubusercontent.com/api-evangelist/bykaranteli/refs/heads/main/openapi/bykaranteli-x402-api-openapi.yml

Other Resources

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Overlay
https://raw.githubusercontent.com/api-evangelist/bykaranteli/refs/heads/main/overlays/bykaranteli-x402-overlay.yaml
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Examples
https://raw.githubusercontent.com/api-evangelist/bykaranteli/refs/heads/main/examples/_index.yml
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LLMsTxt
https://raw.githubusercontent.com/api-evangelist/bykaranteli/refs/heads/main/llms/bykaranteli-llms.txt
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ToolCrosswalk
https://raw.githubusercontent.com/api-evangelist/bykaranteli/refs/heads/main/mcp/bykaranteli-tool-crosswalk.yml
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APICatalog
https://raw.githubusercontent.com/api-evangelist/bykaranteli/refs/heads/main/well-known/bykaranteli-public-manifest.json
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APIsJSON
https://raw.githubusercontent.com/api-evangelist/bykaranteli/refs/heads/main/apis.yml

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OpenAPI Specification

bykaranteli-x402-api-openapi.yml Raw ↑ 
openapi: 3.2.0
info:
  title: ByKaranteli crypto derivatives data X402 API
  version: 1.0.0
  description: Crypto derivatives market structure recorded around the clock. The live snapshots are free and unmetered; the endpoints listed here sell depth and history per call over the x402 protocol.
  x-guidance: Free endpoints under /api/public/* need no payment or key. The /api/x402/* endpoints answer HTTP 402 with machine-readable payment requirements and settle in USDC on Solana or Base per successful response. A failed response settles nothing.
  contact:
    email: support@bykaranteli.com
    url: https://bykaranteli.com/developers
  license:
    name: 'Data: CC0 for published datasets'
    url: https://bykaranteli.com/data
servers:
- url: https://bykaranteli.com
tags:
- name: X402
paths:
  /api/x402:
    get:
      summary: Free machine-readable catalog of the paid endpoints
      operationId: x402Catalog
      security: []
      responses:
        '200':
          description: Catalog of paid endpoints, prices and settlement rails
      tags:
      - X402
  /api/x402/liqmap-levels:
    get:
      summary: 'Full multi-exchange liquidation map snapshot for a Binance USDT-M perp: modeled…'
      operationId: liqmap-levels
      responses:
        '200':
          description: Requested data, returned after payment settles
        '402':
          description: 'Payment required: the response carries x402 payment requirements'
      x-payment-info:
        protocols:
        - x402: {}
        price:
          mode: fixed
          currency: USD
          amount: '0.005000'
        networks:
        - solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp
        - eip155:8453
        asset: USDC
      tags:
      - X402
  /api/x402/options-flow:
    get:
      summary: 'BTC or ETH options tape depth from recorded Deribit flow: daily premium-flow…'
      operationId: options-flow
      responses:
        '200':
          description: Requested data, returned after payment settles
        '402':
          description: 'Payment required: the response carries x402 payment requirements'
      x-payment-info:
        protocols:
        - x402: {}
        price:
          mode: fixed
          currency: USD
          amount: '0.005000'
        networks:
        - solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp
        - eip155:8453
        asset: USDC
      tags:
      - X402
  /api/x402/flow-vpin:
    get:
      summary: 'Order flow toxicity (VPIN) history for BTC, ETH and SOL: 90-day daily track…'
      operationId: flow-vpin
      responses:
        '200':
          description: Requested data, returned after payment settles
        '402':
          description: 'Payment required: the response carries x402 payment requirements'
      x-payment-info:
        protocols:
        - x402: {}
        price:
          mode: fixed
          currency: USD
          amount: '0.002000'
        networks:
        - solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp
        - eip155:8453
        asset: USDC
      tags:
      - X402
  /api/x402/premium-history:
    get:
      summary: 'Daily Coinbase premium history: the Coinbase versus offshore price spread per…'
      operationId: premium-history
      responses:
        '200':
          description: Requested data, returned after payment settles
        '402':
          description: 'Payment required: the response carries x402 payment requirements'
      x-payment-info:
        protocols:
        - x402: {}
        price:
          mode: fixed
          currency: USD
          amount: '0.005000'
        networks:
        - solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp
        - eip155:8453
        asset: USDC
      tags:
      - X402
  /api/x402/cot-history:
    get:
      summary: 'Full CFTC Commitments of Traders weekly history for crypto futures: dealer…'
      operationId: cot-history
      responses:
        '200':
          description: Requested data, returned after payment settles
        '402':
          description: 'Payment required: the response carries x402 payment requirements'
      x-payment-info:
        protocols:
        - x402: {}
        price:
          mode: fixed
          currency: USD
          amount: '0.005000'
        networks:
        - solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp
        - eip155:8453
        asset: USDC
      tags:
      - X402
  /api/x402/liquidations-raw:
    get:
      summary: Individual liquidation events recorded from our own exchange sockets across…
      operationId: liquidations-raw
      responses:
        '200':
          description: Requested data, returned after payment settles
        '402':
          description: 'Payment required: the response carries x402 payment requirements'
      x-payment-info:
        protocols:
        - x402: {}
        price:
          mode: fixed
          currency: USD
          amount: '0.010000'
        networks:
        - solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp
        - eip155:8453
        asset: USDC
      tags:
      - X402
  /api/x402/oi-history:
    get:
      summary: Five minute open interest history for the major perpetuals in base units and…
      operationId: oi-history
      responses:
        '200':
          description: Requested data, returned after payment settles
        '402':
          description: 'Payment required: the response carries x402 payment requirements'
      x-payment-info:
        protocols:
        - x402: {}
        price:
          mode: fixed
          currency: USD
          amount: '0.005000'
        networks:
        - solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp
        - eip155:8453
        asset: USDC
      tags:
      - X402
  /api/x402/funding-history:
    get:
      summary: Settled funding rate history per symbol and venue, the series behind carry and…
      operationId: funding-history
      responses:
        '200':
          description: Requested data, returned after payment settles
        '402':
          description: 'Payment required: the response carries x402 payment requirements'
      x-payment-info:
        protocols:
        - x402: {}
        price:
          mode: fixed
          currency: USD
          amount: '0.005000'
        networks:
        - solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp
        - eip155:8453
        asset: USDC
      tags:
      - X402
  /api/x402/options-oi-history:
    get:
      summary: 'Daily listed options open interest per instrument: strike, expiry, option type…'
      operationId: options-oi-history
      responses:
        '200':
          description: Requested data, returned after payment settles
        '402':
          description: 'Payment required: the response carries x402 payment requirements'
      x-payment-info:
        protocols:
        - x402: {}
        price:
          mode: fixed
          currency: USD
          amount: '0.005000'
        networks:
        - solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp
        - eip155:8453
        asset: USDC
      tags:
      - X402
  /api/x402/dvol-history:
    get:
      summary: Daily implied volatility index history for BTC and ETH going back to 2021, the…
      operationId: dvol-history
      responses:
        '200':
          description: Requested data, returned after payment settles
        '402':
          description: 'Payment required: the response carries x402 payment requirements'
      x-payment-info:
        protocols:
        - x402: {}
        price:
          mode: fixed
          currency: USD
          amount: '0.002000'
        networks:
        - solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp
        - eip155:8453
        asset: USDC
      tags:
      - X402
  /api/x402/slippage-history:
    get:
      summary: 'Hourly recorded execution slippage ladders per symbol: what a given order size…'
      operationId: slippage-history
      responses:
        '200':
          description: Requested data, returned after payment settles
        '402':
          description: 'Payment required: the response carries x402 payment requirements'
      x-payment-info:
        protocols:
        - x402: {}
        price:
          mode: fixed
          currency: USD
          amount: '0.002000'
        networks:
        - solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp
        - eip155:8453
        asset: USDC
      tags:
      - X402
  /api/x402/listings-history:
    get:
      summary: Perpetual listing and delisting events across six exchanges with first seen…
      operationId: listings-history
      responses:
        '200':
          description: Requested data, returned after payment settles
        '402':
          description: 'Payment required: the response carries x402 payment requirements'
      x-payment-info:
        protocols:
        - x402: {}
        price:
          mode: fixed
          currency: USD
          amount: '0.002000'
        networks:
        - solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp
        - eip155:8453
        asset: USDC
      tags:
      - X402
  /api/x402/spot-microstructure:
    get:
      summary: Minute bars with the taker buy versus total quote volume split, pre-joined…
      operationId: spot-microstructure
      responses:
        '200':
          description: Requested data, returned after payment settles
        '402':
          description: 'Payment required: the response carries x402 payment requirements'
      x-payment-info:
        protocols:
        - x402: {}
        price:
          mode: fixed
          currency: USD
          amount: '0.010000'
        networks:
        - solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp
        - eip155:8453
        asset: USDC
      tags:
      - X402