Pay-per-call premium API on Base via x402 — $0.02/request in USDC, no API keys required.
What it does
This endpoint at lowpaymentfee.com/api/endpoint-68 is an x402-gated API labeled "Premium API Access." The provider's site advertises a broad suite of endpoints spanning data & analytics, 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 priced at $0.02 per request, settled in USDC on the Base network with no API keys, no rate limits, and no commitments.
The specific endpoint /api/endpoint-68 is not listed among the named APIs on the provider's landing page, so its exact functionality is unclear. The x402 challenge confirms it is live, accepts POST requests, and requires payment of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The response MIME type is application/json.
No OpenAPI schema, detailed documentation, or example request/response bodies were found. The docs, pricing, API, and README pages all rendered only a "Connect wallet" prompt with no substantive content. Without knowing what this specific endpoint does beyond the generic "Premium API Access" label, agents should treat this as an opaque JSON endpoint whose behavior must be discovered empirically.
Capabilities
Use cases
- —Programmatic access to a pay-per-call JSON API without needing API keys or subscriptions
- —Agent-driven workflows that settle per-request payments in USDC on Base
- —Exploring x402 protocol integrations with low-cost endpoints
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —Agents that need keyless, on-demand API access settled in crypto
- —Low-cost per-request usage without rate limits
Not for
- —Users who need well-documented endpoints with known input/output schemas
- —Production workloads requiring guaranteed SLAs or detailed error handling
- —Anyone without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/endpoint-68 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>" \
-d '{}'Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but the specific functionality of /api/endpoint-68 is unknown — it does not appear in the provider's listed APIs. No documentation, no OpenAPI schema, no example requests or responses are available. This is effectively a stub listing.
Warnings
- —The endpoint /api/endpoint-68 is not listed among the provider's named APIs; its actual functionality is unknown.
- —No OpenAPI schema or documentation is available for this endpoint.
- —All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no content.
- —The exact input format and response structure are undocumented and must be discovered empirically.
Citations
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/endpoint-68
- —Provider lists endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilitieshttps://lowpaymentfee.com