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 settled via the x402 protocol on the Base network using USDC. The specific resource `/api/v1/lab/results/59` is labeled "Premium API Access" and costs up to 20,000 base units of USDC (i.e., $0.02 per call, since USDC uses 6 decimals). No API keys, rate limits, or subscriptions are required — each request is individually paid for with an on-chain USDC micro-payment.
The broader lowpaymentfee.com platform advertises a wide catalog 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 listed at the same $0.02/request price point.
However, the specific endpoint being listed here (`/api/v1/lab/results/59`) does not clearly map to any of the documented categories on the landing page. Its exact functionality — what "lab results" it returns — is not described in any available documentation. The endpoint is confirmed live (returns a valid x402 402 challenge), accepts POST requests, and returns application/json. Without further documentation or example responses, the precise data returned remains unknown.
Capabilities
Use cases
- —Accessing premium data endpoints without subscription or API key management
- —Making one-off paid API calls settled on-chain via USDC on Base
- —Integrating pay-per-request data retrieval into agent workflows
Fit
Best for
- —Developers wanting zero-commitment, pay-as-you-go API access
- —AI agents that can settle x402 payments autonomously
- —Users who prefer on-chain micropayments over traditional billing
Not for
- —Users who need detailed documentation or guaranteed SLAs 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/59
# Returns 402 with x402 challenge; include X-PAYMENT header with valid USDC payment to receive data.Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation explaining what /api/v1/lab/results/59 actually returns, no OpenAPI schema, no example requests or responses, and the endpoint path doesn't match any category listed on the provider's landing page. This is effectively a stub listing.
Warnings
- —The specific endpoint /api/v1/lab/results/59 is not documented anywhere on the provider's site — its purpose and response format are unknown.
- —No OpenAPI spec, example responses, or detailed documentation available.
- —The landing page categories (Data & Analytics, AI & ML, Finance, Infrastructure) do not include a 'lab/results' path — this may be a test or unlisted endpoint.
- —The /api, /pricing, and /README pages returned only 'Connect wallet' with no useful content.
Citations
- —The endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/lab/results/59
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/lab/results/59
- —All listed 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