Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.
What it does
This endpoint at lowpaymentfee.com provides pay-per-request API access using the x402 protocol, settling payments in USDC on the Base network. The specific resource `/api/v1/lab/results/76` is listed under "Premium API Access" and costs up to $0.02 per call (maxAmountRequired of 20,000 base units of USDC with 6 decimals = $0.02). No API keys, rate limits, or subscriptions are required — each request is individually paid via an X-PAYMENT header.
The broader lowpaymentfee.com platform offers a suite of endpoints spanning data & analytics (metrics, reports, data export, insights), AI & machine learning (sentiment analysis, text summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are uniformly priced at $0.02 per request.
The specific endpoint `/api/v1/lab/results/76` appears to be a lab results resource, but no documentation exists describing the exact data returned or the input schema expected in the POST body. The endpoint is confirmed live, returning a proper 402 x402 challenge. Without further documentation or example responses, the exact nature of the "lab results" data is unclear.
Capabilities
Use cases
- —Accessing premium data results on a per-request payment basis without subscriptions
- —Agent-driven workflows that need to pay for individual API calls programmatically
- —Testing x402 payment protocol integrations with a low-cost endpoint
Fit
Best for
- —Developers experimenting with x402 pay-per-call patterns
- —AI agents that need keyless, on-demand API access
- —Low-volume consumers who want to avoid subscription commitments
Not for
- —High-volume batch processing where per-call fees add up quickly
- —Users who need detailed API documentation and guaranteed SLAs
- —Anyone without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/lab/results/76 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is confirmed live with a valid 402 x402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation describing what this specific endpoint returns, no input/output schema, no example requests or responses, and the meaning of 'lab/results/76' is entirely opaque. The crawled pages beyond the homepage returned only 'Connect wallet' with no useful content.
Warnings
- —No documentation exists for the /api/v1/lab/results/76 endpoint — the nature of 'lab results' data is unknown
- —No input schema or example request body is provided for the POST method
- —No example response or output schema is available
- —The /api, /pricing, and /README pages returned no meaningful content (only 'Connect wallet')
- —This endpoint does not appear in the homepage's listed API catalog, raising questions about its purpose
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/lab/results/76
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/lab/results/76
- —All endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —Platform offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categorieshttps://lowpaymentfee.com