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 broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no upfront commitments. The specific endpoint at `/api/v1/transfers/110` is labeled "Premium API Access" and accepts POST requests settled via the x402 exact-payment scheme.
The platform advertises four categories of APIs: Data & Analytics (metrics, reports, data export, insights), 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 follow the same $0.02 pricing model. The x402 challenge for this particular endpoint specifies a maxAmountRequired of 20000 base units of USDC (6 decimals), which equals $0.02.
Documentation beyond the landing page is extremely thin — the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The endpoint is live (returns a proper 402 challenge), but without documentation it is unclear what payload the POST request expects or what response format is returned.
Capabilities
Use cases
- —Accessing data analytics and reports without subscription commitments
- —Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-call basis
- —Fetching real-time crypto and finance data (prices, gas estimates, exchange rates)
- —Using utility services like geocoding and data validation with instant pay-per-use
- —Integrating agent-purchasable endpoints into autonomous workflows via x402
Fit
Best for
- —Developers wanting zero-signup, pay-as-you-go API access
- —AI agents that can settle x402 payments autonomously on Base
- —Projects needing low-cost micro-transactions for API calls
Not for
- —Users who need detailed API documentation and request/response schemas before integrating
- —High-volume consumers who need bulk pricing or SLA guarantees
- —Developers without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transfers/110 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming pricing and settlement details. However, there is no OpenAPI spec, no request/response schema, and all documentation pages render only a wallet-connect prompt. The purpose of this specific '/transfers/110' endpoint is unclear beyond the generic 'Premium API Access' label. Effectively a stub listing.
Warnings
- —No API documentation available — /docs, /api, /pricing, and /README all show only 'Connect wallet'
- —No OpenAPI or schema definition found for any endpoint
- —The specific function of /api/v1/transfers/110 ('Premium API Access') is undocumented and unclear
- —No request body schema or response schema is available; integration requires trial and error
Citations
- —All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The x402 challenge for this endpoint specifies maxAmountRequired of 20000 base units of USDC (USD Coin) on Basehttps://lowpaymentfee.com/api/v1/transfers/110
- —The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompthttps://lowpaymentfee.com/docs