Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. The specific resource path `/api/v1/lab/results/48` suggests a lab-results or experimental-data endpoint, though the exact data returned is not documented beyond the generic "Premium API Access" label. Payment is settled on the Base network using USDC (contract 0x8335…2913) at a maximum cost of $0.02 per request (20,000 base units with 6 decimals).
The broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints share the same $0.02/request pricing, require no API keys or rate limits, and are accessed via x402 payment headers on the Base network.
The specific `/api/v1/lab/results/48` endpoint is live and returns a proper 402 challenge when called without payment. However, there is no dedicated documentation, OpenAPI schema, or example response for this particular resource. The output MIME type is `application/json` and the HTTP method is POST. Without further documentation it is unclear what payload (if any) the POST body should contain, or what shape the JSON response takes.
Capabilities
Use cases
- —Fetching lab or experimental result data behind a micropayment wall
- —Programmatic access to premium data without managing API keys or subscriptions
- —Agent-driven data retrieval with automatic per-call USDC payment on Base
Fit
Best for
- —Developers wanting zero-friction pay-per-call API access
- —AI agents that can settle x402 payments autonomously
- —Users who prefer crypto micropayments over subscription billing
Not for
- —Users needing detailed documentation or guaranteed SLAs before integrating
- —Anyone who cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/lab/results/48 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid 402 challenge, but there is no OpenAPI schema, no documented request/response format, and no explanation of what 'lab/results/48' actually returns. The listing is essentially a stub with pricing info only.
Warnings
- —No OpenAPI or schema documentation available for this endpoint
- —The meaning of '/api/v1/lab/results/48' is undocumented — unclear what data is returned
- —No example request body or response body available
- —The /api, /pricing, and /README pages all returned only a 'Connect wallet' prompt with no useful content
Citations
- —Endpoint returns HTTP 402 with x402 challenge advertising USDC on Base at maxAmountRequired 20000https://lowpaymentfee.com/api/v1/lab/results/48
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/lab/results/48
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —Platform offers APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categorieshttps://lowpaymentfee.com