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/47` is listed under "Premium API Access" and costs up to $0.02 per call (maxAmountRequired of 20,000 base units of USDC, which is 6 decimals = $0.02). No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.
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 priced uniformly at $0.02 per request.
However, the specific endpoint `/api/v1/lab/results/47` does not clearly map to any of the documented API categories on the landing page. It appears under a "lab/results" path that is not described in the available documentation. The endpoint is live and returns a proper 402 challenge, but the actual data returned upon successful payment is unknown — there is no OpenAPI schema, no example responses, and no detailed documentation beyond the generic "Premium API Access" label.
Capabilities
Use cases
- —Accessing premium data results behind a per-call USDC paywall
- —Agent-driven API consumption without pre-registration or API keys
- —Programmatic micropayment-gated data retrieval on Base
Fit
Best for
- —Developers wanting zero-signup, pay-as-you-go 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 purchasing
- —Anyone without USDC on the Base network
- —Use cases requiring free or bulk-discounted access
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/lab/results/47 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, but the specific resource '/api/v1/lab/results/47' is undocumented — no schema, no example responses, and no description beyond the generic 'Premium API Access' label. The landing page documents other endpoints but not this one, making it effectively a stub listing.
Warnings
- —The path /api/v1/lab/results/47 does not appear in the provider's documented API catalog — its purpose and response format are unknown.
- —No OpenAPI schema, example request body, or example response is available.
- —No detailed documentation pages were accessible (pricing, README, and /api pages only showed 'Connect wallet').
- —The actual data returned upon successful payment is entirely unverified.
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/lab/results/47
- —USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/lab/results/47
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com