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/22` 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 via an on-chain micropayment.
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/22`) does not clearly map to any of the documented categories on the landing page. Its purpose — whether it returns lab test results, experimental data, or something else — is not documented. The x402 challenge confirms the endpoint is live and accepting POST requests, but no request/response schema or documentation is available for this particular resource. Callers should be prepared for an unknown response format.
Capabilities
Use cases
- —Accessing premium data behind a per-request USDC micropayment wall
- —Agent-driven API consumption without pre-registration or API keys
- —Programmatic pay-as-you-go data retrieval on Base L2
Fit
Best for
- —Developers wanting keyless, 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 well-documented request/response schemas before integrating
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Anyone without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/lab/results/22
# Returns 402 with x402 payment challenge.
# Include X-PAYMENT header with a valid x402 payment proof to access the resource.Endpoint
Quality
The x402 challenge is live and confirms pricing and payment details, but the specific endpoint /api/v1/lab/results/22 has no documentation, no request/response schema, and its purpose is unclear. The landing page documents other endpoints but not this one. Effectively a stub listing.
Warnings
- —The endpoint /api/v1/lab/results/22 is not documented anywhere on the provider's site — its purpose and response format are unknown.
- —No OpenAPI spec, request schema, or response schema is available.
- —The /api, /pricing, and /README pages all returned only a 'Connect wallet' prompt with no useful content.
- —The 'lab/results/22' path suggests a specific resource ID; it is unclear whether other IDs exist or what 'lab results' refers to.
Citations
- —The endpoint returns a 402 challenge requesting USDC payment on Base network with maxAmountRequired of 20000 base unitshttps://lowpaymentfee.com/api/v1/lab/results/22
- —All listed endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/lab/results/22