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/139` is listed as "Premium API Access" and accepts POST requests. Payment is settled on-chain to a specified wallet address using USDC (contract 0x8335…2913 on Base), with a maximum amount of 20,000 base units — equivalent to $0.02 USD (USDC uses 6 decimals).
The broader 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 are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.
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 schema, no request/response examples, and no detailed documentation for any endpoint. The specific functionality behind the `/api/v1/stripe/charges/139` path is unclear; the name "Premium API Access" and the path segment "stripe/charges" suggest it may relate to Stripe charge data or payment processing, but this is speculative. The endpoint is confirmed live via a valid 402 challenge response.
Capabilities
Use cases
- —Accessing premium API data with per-call USDC micropayments on Base
- —Programmatic pay-as-you-go API consumption without API key management
- —Agent-driven API calls settled via x402 on-chain payments
Fit
Best for
- —Developers wanting zero-commitment, pay-per-call API access
- —AI agents that can settle x402 USDC payments on Base
- —Users who prefer on-chain micropayments over subscription billing
Not for
- —Users needing detailed API documentation or OpenAPI specs before integrating
- —High-volume consumers who need bulk pricing or rate-limit guarantees
- —Developers without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/139 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, no documentation beyond a wallet-connect prompt, and the actual functionality of this specific endpoint is unclear. This is effectively a stub listing.
Warnings
- —No documentation available — /docs, /api, /pricing, and /README all return only a 'Connect wallet' prompt with no content.
- —No OpenAPI or schema definition found for any endpoint.
- —The specific purpose of /api/v1/stripe/charges/139 ('Premium API Access') is unclear; the path suggests Stripe charge data but this is unconfirmed.
- —No request or response examples are available anywhere in the crawled material.
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Base network.https://lowpaymentfee.com/api/v1/stripe/charges/139
- —All listed APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network.https://lowpaymentfee.com
- —The platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories.https://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.https://lowpaymentfee.com/api/v1/stripe/charges/139