x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request via USDC.
What it does
lowpaymentfee.com is an x402-protocol API marketplace that gates a variety of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint at `/api/v1/stripe/charges/17` is listed as "Premium API Access" and accepts payment via the x402 exact scheme. The x402 challenge confirms the endpoint is live, requiring up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.
The broader platform advertises 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 listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments.
Documentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The exact functionality behind the `/api/v1/stripe/charges/17` path is unclear; the name "Premium API Access" and the path segment "stripe/charges" suggest it may relate to Stripe charge data or a payment-related operation, but this is speculative given the lack of documentation.
Capabilities
Use cases
- —Accessing data analytics and reporting endpoints without API key management
- —Running AI inference tasks (sentiment, summarization, classification, embeddings) via micropayments
- —Fetching financial data such as token quotes, exchange rates, and gas estimates
- —Using utility services like geocoding, validation, and conversion on a pay-per-call basis
Fit
Best for
- —Developers who want instant API access without signup or API key provisioning
- —Agents and bots that can pay per-request using USDC on Base
- —Low-volume or exploratory use cases where $0.02/request is cost-effective
Not for
- —High-volume production workloads where per-request crypto payments add overhead
- —Users who need detailed API documentation, schemas, or SLAs before integrating
- —Teams that cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/17 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and confirms pricing and payment details, but there is zero documentation beyond a landing page listing. No OpenAPI spec, no request/response schemas, no examples, and the specific endpoint's purpose ("stripe/charges/17") is unclear. The docs, pricing, and README pages are all empty wallet-connect stubs.
Warnings
- —No API documentation available — /docs, /api, /pricing, and /README all show only 'Connect wallet' with no content.
- —No OpenAPI or schema definition found; request and response formats are unknown.
- —The endpoint path '/api/v1/stripe/charges/17' with description 'Premium API Access' is ambiguous — its actual functionality is undocumented.
- —No agents.txt or robots.txt found on the origin.
Citations
- —The x402 challenge returns 402 with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/stripe/charges/17
- —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 Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/stripe/charges/17