Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/payments/92` is labeled "Premium API Access" and charges up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys or rate limits are advertised — callers simply attach an x402 payment header to each request.
The platform organizes its APIs into four categories: 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 listed endpoints share the same $0.02 per-request pricing.
Documentation is extremely sparse. The docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what request body the `/api/v1/payments/92` endpoint expects or what response it returns. The "Premium API Access" label is generic and does not clarify the endpoint's specific function.
Capabilities
Use cases
- —Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management
- —Fetching real-time financial data such as token quotes, exchange rates, and gas estimates
- —Running data analytics queries and exporting data on a per-request payment basis
- —Geocoding and utility operations paid per call via USDC on Base
Fit
Best for
- —Developers wanting zero-commitment, pay-as-you-go API access
- —Agent workflows that can attach x402 payment headers automatically
- —Users who prefer crypto-native (USDC on Base) micropayments over subscription billing
Not for
- —Production workloads requiring detailed API documentation and SLAs
- —Users who need fiat-only payment options (only USDC on Base is supported)
- —High-volume consumers who would benefit from bulk pricing or subscriptions
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/payments/92 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation beyond a wallet-connect prompt, no request/response schemas, and the endpoint name 'Premium API Access' is generic with no indication of what it actually does. This is effectively a stub listing.
Warnings
- —No API documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'
- —No OpenAPI or schema definition found for any endpoint
- —The specific function of /api/v1/payments/92 ('Premium API Access') is unclear — it does not match any of the named endpoints listed on the homepage
- —Request and response formats are entirely unknown
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/payments/92
- —All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/payments/92