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 micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/stripe/charges/112` is listed as "Premium API Access" and accepts POST requests. The x402 challenge indicates a maximum amount of 20,000 base units of USDC (0x8335…), which equals $0.02 per call (USDC uses 6 decimals). Payment is made via the x402 `exact` scheme with a 300-second timeout.
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 technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The specific behavior of the `/api/v1/stripe/charges/112` endpoint (what it returns, what input it expects) is not documented anywhere in the crawled material. The endpoint is live and returning a valid x402 402 challenge.
Capabilities
Use cases
- —Paying per-request for API access without needing API keys or subscriptions
- —Integrating x402-compatible agents with low-cost data or utility endpoints
- —Accessing premium API functionality via on-chain USDC micropayments on Base
Fit
Best for
- —Developers or agents wanting zero-signup, pay-as-you-go API access
- —x402-compatible wallets and autonomous agents on Base
- —Low-volume or experimental use cases where per-call pricing is preferable
Not for
- —Users needing detailed API documentation or guaranteed SLAs before integrating
- —High-volume production workloads where subscription pricing would be cheaper
- —Users without a Base-network USDC wallet or x402-compatible client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/112 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, but there is essentially no documentation: no OpenAPI spec, no request/response schemas, no examples, and the docs pages are empty. The purpose of this specific endpoint ('/api/v1/stripe/charges/112') is unclear beyond its title 'Premium API Access'. Score reflects a functional but undocumented stub.
Warnings
- —No OpenAPI spec or schema documentation available
- —All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content
- —The specific purpose and expected input/output of /api/v1/stripe/charges/112 is undocumented
- —The endpoint path suggests Stripe charge functionality but no details confirm this
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base networkhttps://lowpaymentfee.com/api/v1/stripe/charges/112
- —All endpoints are listed at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —Documentation pages (/docs, /api, /pricing, /README) contain only a 'Connect wallet' prompthttps://lowpaymentfee.com/docs