Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.
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, and infrastructure utilities. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required. The x402 payment protocol allows agents and users to pay per call by attaching a cryptographic payment header to each HTTP request.
The specific endpoint at `/api/v1/wire/92` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the site's advertised pricing. The endpoint accepts POST requests and returns application/json responses.
The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation. However, documentation beyond the landing page is essentially empty (all doc/pricing/API pages just show "Connect wallet"), so the actual functionality behind each endpoint is unverified. Without OpenAPI schemas, request/response examples, or detailed docs, the precise inputs and outputs for this endpoint remain unknown.
Capabilities
Use cases
- —Agents needing on-demand API access without pre-registration or API keys
- —Paying per request for miscellaneous utility or data endpoints using USDC on Base
- —Programmatic access to analytics, AI inference, or financial data with crypto micropayments
Fit
Best for
- —Developers or agents who want zero-signup, pay-as-you-go API access
- —x402-compatible clients on the Base network
- —Low-volume or sporadic API consumers who prefer per-call billing
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —High-volume consumers who need bulk pricing or rate-limit guarantees
- —Users without access to USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wire/92 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>" \
-d '{}'Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty stubs ('Connect wallet'). The actual functionality behind 'Premium API Access' at /api/v1/wire/92 is completely undocumented, making this effectively a stub listing.
Warnings
- —No documentation available — all doc, pricing, and API pages return only 'Connect wallet'
- —The purpose and functionality of /api/v1/wire/92 ('Premium API Access') is not described anywhere
- —No OpenAPI spec, no request/response schema, no examples provided by the provider
- —Cannot verify what data or service this endpoint actually returns
Citations
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02https://lowpaymentfee.com/api/v1/wire/92
- —Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com