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/55` 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 upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The broader lowpaymentfee.com platform advertises a wide catalog of endpoints spanning data & analytics, AI & machine learning (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation), all priced at $0.02 per request. However, the specific endpoint `/api/v1/lab/results/55` falls under a "lab/results" path that is not explicitly listed in the site's public catalog, so its exact functionality is unclear. The x402 challenge confirms it is live, accepts POST requests, and returns application/json.
Without OpenAPI documentation, request/response schemas, or example payloads for this specific endpoint, the precise data returned and the expected POST body remain unknown. The endpoint is confirmed live via a valid 402 challenge.
Capabilities
Use cases
- —Accessing premium data results behind a per-call paywall without subscription
- —Agent-driven programmatic data retrieval with automatic crypto micropayments
- —Integrating pay-as-you-go API calls into workflows on the Base L2 network
Fit
Best for
- —Developers wanting zero-commitment, pay-per-use API access
- —AI agents that can settle x402 payments autonomously on Base
- —Users who prefer crypto micropayments over traditional API key subscriptions
Not for
- —Users who need detailed API documentation and schemas before integrating
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/lab/results/55 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is confirmed live via a valid x402 402 challenge, but there is no OpenAPI spec, no request/response schema, no documentation for the specific /api/v1/lab/results/55 path, and the crawled pages beyond the homepage returned only 'Connect wallet' with no useful content. The endpoint's actual functionality is unknown.
Warnings
- —No OpenAPI or schema documentation available for this endpoint
- —The path /api/v1/lab/results/55 is not listed in the site's public API catalog — its purpose is unclear
- —No example request or response bodies are available
- —Crawled /api, /pricing, and /README pages returned no meaningful content (only 'Connect wallet')
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/lab/results/55
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/lab/results/55
- —All listed APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com