Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Every endpoint is priced at $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no upfront commitments. The x402 protocol handles payment inline: callers attach a payment header to each HTTP request and receive the response immediately upon settlement.
The specific endpoint being listed here (`/api/v1/orders/25`) is labeled "Premium API Access" and returns `application/json` via POST. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. This is consistent with the site-wide $0.02/request pricing.
The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data export. However, documentation pages (docs, pricing, README) returned only a "Connect wallet" prompt with no substantive content, so the actual behavior and response schemas of these endpoints remain unverified. The endpoint is live and returning a valid 402 challenge.
Capabilities
Use cases
- —Accessing premium API data without subscription or API key management
- —Making one-off paid API calls from autonomous agents using x402
- —Integrating pay-per-request endpoints into workflows that settle in USDC on Base
Fit
Best for
- —Agents or developers wanting zero-commitment, pay-as-you-go API access
- —x402-compatible clients on the Base network
- —Low-volume or bursty workloads where per-call pricing is preferable to subscriptions
Not for
- —High-volume production workloads where bulk pricing would be more economical
- —Users who need detailed API documentation or response schema guarantees before integrating
- —Callers who cannot settle payments in USDC on Base
Quick start
# POST with x402 payment header (pseudocode)
curl -X POST https://lowpaymentfee.com/api/v1/orders/25 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, there is no OpenAPI schema, no documentation of request/response formats, and the docs/pricing/README pages are all empty (just 'Connect wallet'). The specific purpose of '/api/v1/orders/25' labeled 'Premium API Access' is unclear — it could be a generic demo or placeholder. Effectively a stub listing.
Warnings
- —Documentation pages (/docs, /pricing, /README) contain no usable content — only 'Connect wallet' prompts.
- —The specific endpoint /api/v1/orders/25 ('Premium API Access') has no description of what it actually returns or what input it expects.
- —No OpenAPI spec or response schema is available; actual endpoint behavior is unverified.
- —The broad catalog of advertised endpoints (AI, finance, analytics, etc.) could not be independently verified.
Citations
- —Site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —x402 challenge shows maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network.https://lowpaymentfee.com/api/v1/orders/25
- —Endpoint is described as 'Premium API Access' returning application/json via POST.https://lowpaymentfee.com/api/v1/orders/25
- —Documentation, pricing, and README pages return only 'Connect wallet' with no substantive content.https://lowpaymentfee.com/docs