Pay-per-call API platform on Base via x402 — $0.02/request for data, AI, finance, and utility endpoints.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across 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 endpoints are priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol.
The specific endpoint at /api/v1/payments/244 is labeled "Premium API Access" and advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme with no API keys or rate limits required — callers simply attach an X-PAYMENT header to each POST request. The payment timeout is 300 seconds.
Documentation is extremely sparse: the /docs, /pricing, /api, 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 402 with a valid x402 challenge), but without documentation it is unclear what request body this specific endpoint expects or what response it returns.
Capabilities
Use cases
- —Accessing AI inference (sentiment, summarization, classification, embeddings) on a per-call payment basis without API keys
- —Fetching real-time financial data such as token quotes, exchange rates, and gas estimates via micropayments
- —Running data analytics queries (metrics, reports, insights) with pay-as-you-go pricing
- —Using utility services like geocoding, validation, and data conversion without subscription commitments
Fit
Best for
- —Agents or bots that need instant, keyless API access paid per request
- —Developers prototyping with low-cost, no-commitment API calls
- —Web3-native applications already operating on the Base network
Not for
- —High-volume production workloads where per-request pricing at $0.02 adds up quickly
- —Users who need detailed API documentation, SDKs, or guaranteed SLAs
- —Teams without crypto wallets or USDC on Base
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/payments/244 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is confirmed live with a valid x402 402 challenge, and the landing page lists available endpoints with pricing. However, documentation pages are empty (just 'Connect wallet'), there is no OpenAPI spec, no request/response schemas, and no examples. The specific purpose of /api/v1/payments/244 ('Premium API Access') is unclear beyond its label. This is effectively a stub listing.
Warnings
- —Documentation pages (/docs, /pricing, /api, /README) are all empty — only show 'Connect wallet'
- —No OpenAPI or schema documentation available for any endpoint
- —The specific function of /api/v1/payments/244 is unclear — 'Premium API Access' is a generic label not matching any of the listed API categories
- —Request and response formats are unknown; example_request_json and example_response_json cannot be provided
- —The broad catalog claims (AI, finance, data, utilities) cannot be independently verified from the crawled content
Citations
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base networkhttps://lowpaymentfee.com
- —The x402 challenge for /api/v1/payments/244 advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/payments/244
- —Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com