Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. It is one of many endpoints offered by the provider, which spans categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, rate limits, or commitments required.
The specific endpoint `/api/v1/payments/327` returns a valid x402 challenge (HTTP 402) advertising an exact-payment scheme. The max amount required is 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts POST requests and returns application/json.
While the provider's landing page lists a broad catalog of endpoints (metrics, reports, sentiment analysis, summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and generation), the specific functionality behind `/api/v1/payments/327` is not documented beyond the label "Premium API Access." No OpenAPI spec, detailed request/response schemas, or usage examples were found in the crawl. The docs, API, pricing, and README pages all rendered only a "Connect wallet" prompt with no additional content. This makes it difficult to determine exactly what data or service this particular endpoint returns.
Capabilities
Use cases
- —Programmatic access to a premium API service paid per-call with USDC on Base
- —Agent-driven workflows that need keyless, on-demand API access
- —Testing x402 payment protocol integrations against a live endpoint
Fit
Best for
- —Developers experimenting with x402 payment-gated APIs
- —AI agents that can settle USDC payments on Base automatically
- —Users who want pay-as-you-go access without subscriptions or API keys
Not for
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —Anyone without a Base-compatible USDC wallet
- —High-volume use cases where $0.02/request adds up without bulk discounts
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/payments/327 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a label, and no examples. The actual functionality behind 'Premium API Access' at /api/v1/payments/327 is undefined.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.
- —The specific functionality of /api/v1/payments/327 ('Premium API Access') is not described anywhere; it is unclear what data or service it provides.
- —No OpenAPI spec or request/response schema found.
- —No examples of successful responses available.
Citations
- —All endpoints priced at $0.02/request with no API keys, rate limits, or commitmentshttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units USDC on Base (=$0.02)https://lowpaymentfee.com/api/v1/payments/327
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/payments/327
- —Provider offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categorieshttps://lowpaymentfee.com