Pay-per-call market quote endpoint for EMR token data, settled in USDC on Base via x402.
What it does
This endpoint at `/api/v1/market/quote/EMR` is part of the lowpaymentfee.com platform, which offers a broad catalog of pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints use the x402 protocol for payment, settling in USDC on the Base network with no API keys, no rate limits, and no subscriptions required.
The specific endpoint probed serves market quote data for the ticker "EMR." It accepts POST requests and returns JSON. The x402 challenge confirms the endpoint is live, advertising a maximum cost of 20,000 base units of USDC (0.02 USD per request, since USDC uses 6 decimals). Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base, with a 300-second payment timeout.
Documentation beyond the landing page is extremely thin — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema, and no example payloads available. The endpoint's exact input parameters and response structure must be discovered experimentally. The broader platform lists many other endpoints at $0.02 each across finance, AI, and infrastructure categories, but none have published schemas either.
Capabilities
Use cases
- —Fetching real-time or on-demand market quote data for the EMR ticker
- —Integrating pay-per-call market data into trading bots or dashboards without managing API keys
- —Agent-driven financial data retrieval with automatic USDC micropayments on Base
Fit
Best for
- —Developers needing quick, keyless access to EMR market quotes
- —AI agents that can settle x402 payments autonomously on Base
- —Low-volume or sporadic market data consumers who prefer pay-per-use over subscriptions
Not for
- —High-frequency trading requiring sub-second latency guarantees (no SLA documented)
- —Users who need comprehensive documentation or OpenAPI specs before integration
- —Anyone needing market data for tickers other than EMR from this specific endpoint
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/market/quote/EMR \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is confirmed live via a valid x402 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no example payloads. The actual data returned and required input fields are unknown.
Warnings
- —No OpenAPI or schema documentation available — request and response formats are undocumented
- —Docs, API, pricing, and README pages all render only 'Connect wallet' with no technical content
- —The nature and source of 'EMR' market quote data is unspecified — unclear what asset or data provider backs this
- —No SLA, rate limit, or uptime guarantees documented
Citations
- —Endpoint returns 402 with x402 challenge advertising 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/market/quote/EMR
- —Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/market/quote/EMR
- —Docs, pricing, API, and README pages show only 'Connect wallet' with no additional contenthttps://lowpaymentfee.com/docs