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 gated by the x402 payment protocol. The specific resource `/api/v1/lab/results/74` is listed under "Premium API Access" and accepts POST requests, settling payments in USDC on the Base network. The x402 challenge advertises a maximum amount of 20,000 base units of USDC (6 decimals), which equals $0.02 per request.
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 uniformly priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.
The specific endpoint `/api/v1/lab/results/74` appears to be a lab/results resource, but its exact functionality is not documented on the site's landing page — it is not listed among the publicly advertised API categories. The endpoint is live and returns a valid x402 challenge, but without further documentation or example responses, the precise data returned is unknown. Callers should be prepared for an `application/json` response as indicated by the challenge's mimeType field.
Capabilities
Use cases
- —Accessing premium data results via a single micropayment without subscription
- —Integrating pay-per-call API access into autonomous agent workflows
- —Fetching lab or experimental results behind an x402 paywall
Fit
Best for
- —Developers wanting zero-commitment, pay-as-you-go 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 needing detailed API documentation or OpenAPI specs before integrating
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Users without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/lab/results/74 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but the specific resource /api/v1/lab/results/74 is not documented anywhere on the site. There is no OpenAPI spec, no example request/response, and no description of what 'lab results 74' actually returns. The listing is effectively a stub with confirmed liveness.
Warnings
- —The endpoint /api/v1/lab/results/74 is not listed among the publicly advertised APIs on the landing page — its purpose and response format are unknown.
- —No OpenAPI spec, example payloads, or detailed documentation available.
- —The /api, /pricing, and /README pages all returned only a 'Connect wallet' prompt with no useful content.
Citations
- —The x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/lab/results/74
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/lab/results/74