Pay-per-call market quote for COST token via x402 on Base, settled in USDC.
What it does
This endpoint at lowpaymentfee.com provides a market quote for the COST token (or ticker "COST") through a simple POST request, paid per-call using the x402 protocol. The payment is settled on the Base network in USDC at a cost of $0.02 per request (20,000 base units of USDC with 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The endpoint is part of a broader platform offering data & analytics, AI/ML inference, finance/Web3, and infrastructure utility APIs, all priced uniformly at $0.02 per request. This specific route (`/api/v1/market/quote/COST`) falls under the Finance & Web3 category and presumably returns a JSON market quote for the COST symbol. However, no detailed response schema or example output is documented in the crawled material, so the exact fields returned are unknown.
The x402 challenge was successfully captured (HTTP 402 with version 1 challenge), confirming the endpoint is live. The payment is directed to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the USDC contract on Base (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The maximum timeout for payment settlement is 300 seconds.
Capabilities
Use cases
- —Fetching a real-time market quote for the COST symbol in an automated trading or analytics pipeline
- —Agents that need on-demand price data without managing API keys or subscriptions
- —Integrating market data into a Web3 application with native crypto micropayments
Fit
Best for
- —AI agents needing keyless, pay-per-call market data
- —Developers building on Base who want USDC-settled API access
- —Low-volume or sporadic market data consumers who prefer no subscriptions
Not for
- —High-frequency trading requiring sub-millisecond latency and bulk pricing
- —Users who need comprehensive historical OHLCV data or charting
- —Anyone without a Base-network USDC wallet for x402 payments
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/market/quote/COST \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_proof>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base). However, there is no documented request body schema, no response schema or example, and the docs/pricing/README pages all returned only a 'Connect wallet' stub with no useful content. The exact meaning of 'COST' and the response format must be inferred.
Warnings
- —No response schema or example output is documented — the exact fields returned are unknown.
- —Documentation pages (/docs, /pricing, /README, /api) returned only 'Connect wallet' with no substantive content.
- —It is unclear whether 'COST' refers to a crypto token, a stock ticker (Costco), or something else.
- —No OpenAPI spec or AI plugin manifest was found.
Citations
- —The endpoint returns HTTP 402 with an x402 v1 challenge, confirming it is live.https://lowpaymentfee.com/api/v1/market/quote/COST
- —Price is $0.02 per request (maxAmountRequired 20000 base units of USDC with 6 decimals) on Base network.https://lowpaymentfee.com/api/v1/market/quote/COST
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access.https://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.https://lowpaymentfee.com/api/v1/market/quote/COST