Market quote for BLK token via x402 micropayment on Base network, $0.02 per request.
What it does
This endpoint at lowpaymentfee.com provides a market quote for the "BLK" token (or asset) via the path `/api/v1/market/quote/BLK`. It is part of a broader platform offering pay-per-call APIs across data analytics, AI/ML inference, finance, crypto, and utility categories — all settled via the x402 protocol on the Base network using USDC.
The endpoint accepts POST requests and returns JSON. Payment is handled inline: callers attach an X-PAYMENT header containing a signed x402 payment for up to $0.02 in USDC (the challenge advertises maxAmountRequired of 20,000 base units, which is 0.02 USDC given 6 decimals). There are no API keys, no rate limits, and no signup — access is instant once payment is included. The x402 challenge specifies the "exact" scheme, Base network, and a 300-second timeout.
The platform lists many other endpoints at the same $0.02 price point covering sentiment analysis, text summarization, embeddings, price feeds, exchange rates, gas estimates, geocoding, and more. Documentation pages exist but appear gated behind a wallet connection, so detailed request/response schemas for this specific endpoint are not publicly available. The exact structure of the BLK quote response (fields, supported parameters) is unknown from the crawled material.
Capabilities
Use cases
- —Fetching a real-time market quote for the BLK token programmatically
- —Integrating BLK price data into a trading bot or portfolio tracker
- —Agent-driven market data retrieval with automatic micropayment settlement
Fit
Best for
- —Developers needing on-demand BLK token pricing without API key management
- —AI agents that can settle x402 payments autonomously on Base
- —Low-volume or sporadic market data consumers who prefer pay-per-call over subscriptions
Not for
- —High-frequency trading requiring sub-second latency and bulk pricing tiers
- —Users who need detailed historical OHLCV data (no evidence this endpoint provides it)
- —Anyone without a Base-network USDC wallet or x402-compatible client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/market/quote/BLK \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-signed-payment-header>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documented request/response format, no examples, and the docs pages are gated behind wallet connection. The identity of "BLK" as a token is not explained. This is effectively a stub listing with confirmed liveness.
Warnings
- —No public documentation available — docs, pricing, and API pages all require wallet connection to view content.
- —The exact request body format and response schema for /api/v1/market/quote/BLK are unknown.
- —It is unclear what 'BLK' refers to — no token metadata or description is provided by the platform.
- —The platform lists many endpoints at the same price; quality and reliability of each is unverified.
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units in USDC on Base networkhttps://lowpaymentfee.com/api/v1/market/quote/BLK
- —All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/market/quote/BLK