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/96` is labeled "Premium API Access" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is made inline via the X-PAYMENT header with no API keys, accounts, or rate limits required.
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 at the same $0.02/request price point. However, the specific endpoint being listed here (`/api/v1/lab/results/96`) does not clearly map to any of those documented categories; its exact functionality is not described in the available documentation.
The endpoint is live and returns a valid x402 challenge (HTTP 402) with scheme "exact" on the Base network, paying to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` in USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The input method is HTTP POST and the response MIME type is `application/json`. No OpenAPI schema, request body schema, or response schema is provided, so the exact request format and response structure are unknown.
Capabilities
Use cases
- —Accessing premium data results via a single paid HTTP POST call
- —Agent-driven workflows that need on-demand paid API access without pre-registration
- —Programmatic retrieval of lab/results data with instant USDC micropayment
Fit
Best for
- —Developers wanting zero-signup, pay-as-you-go API access
- —AI agents with Base USDC wallets needing frictionless endpoint access
- —Low-volume or sporadic API consumers who prefer per-call pricing over subscriptions
Not for
- —Users who need detailed API documentation or response schemas before integrating
- —High-volume consumers who would benefit from bulk pricing or subscription plans
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/lab/results/96 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but the specific resource `/api/v1/lab/results/96` has no documentation explaining what it returns, what input it expects, or what "lab results" means. No OpenAPI spec, no request/response schemas, and the crawled pages provide no detail about this particular path. The listing is essentially a stub.
Warnings
- —The specific endpoint /api/v1/lab/results/96 is not documented anywhere on the site — its purpose and expected input/output are unknown.
- —No OpenAPI specification or request/response schema is available.
- —The /api, /pricing, and /README pages returned only a 'Connect wallet' prompt with no useful content.
- —The endpoint path suggests it may return a single static resource (result ID 96) rather than a general-purpose API.
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/lab/results/96
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/lab/results/96
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The site lists endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categorieshttps://lowpaymentfee.com