Pay-per-call API platform on Base with USDC payments via x402 — $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. All endpoints are priced at $0.02 per request, paid in USDC on the Base network. The platform uses the x402 payment protocol, meaning no API keys or accounts are required — callers simply attach a payment header to each request.
The specific endpoint at `/api/v1/payments/67` is listed as "Premium API Access" and accepts POST requests. The x402 challenge confirms it is live, requesting up to 20,000 base units of USDC (0x8335…) on Base, which equals $0.02 (USDC uses 6 decimals). The platform advertises no rate limits, no minimums, and instant access.
Documentation is extremely sparse. The docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/payments/67` endpoint actually returns. The landing page lists many endpoints across categories but provides no detail on input parameters or response formats for any of them. Prospective users should expect to experiment or contact the provider for integration details.
Capabilities
Use cases
- —Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management
- —Fetching real-time crypto token quotes and gas estimates via pay-per-call
- —Running geocoding or data validation utilities with per-request USDC micropayments
- —Exporting analytics data or generating reports on demand
- —Integrating agent-driven workflows that pay per API call on Base
Fit
Best for
- —Developers wanting zero-signup, pay-as-you-go API access
- —AI agents that can settle USDC payments on Base autonomously
- —Projects needing low-cost micropayment-gated endpoints
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —High-volume consumers who need bulk pricing or subscription plans
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/payments/67 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, confirming pricing and network. However, documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no description of what this specific endpoint returns. The listing is essentially a stub with confirmed liveness.
Warnings
- —Documentation pages (/docs, /pricing, /api, /README) contain no substantive content — only 'Connect wallet' prompts
- —No OpenAPI or schema available; input parameters and response format for /api/v1/payments/67 are unknown
- —The endpoint name 'Premium API Access' is generic and does not describe what the endpoint actually does
- —No robots.txt or agents.txt found
Citations
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (6 decimals = $0.02) on Base networkhttps://lowpaymentfee.com/api/v1/payments/67
- —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/payments/67