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 access to a variety of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint at `/api/v1/stripe/charges/35` is listed as "Premium API Access" and requires a maximum of 20,000 base units of USDC (0.02 USD) per call. Payment is made via the x402 exact scheme — no API keys, no rate limits, and no upfront commitments are needed.
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 the same $0.02/request price point and settle payments to the same USDC contract on Base (0x8335…2913).
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 crawled content. The endpoint is confirmed live (returns a proper 402 x402 challenge), but without documentation it is unclear what request body the POST endpoint expects or what response payload it returns.
Capabilities
Use cases
- —Paying per-request for premium API access without needing API keys or subscriptions
- —Integrating x402-compatible agents that autonomously pay for API calls on Base
- —Accessing a variety of data, AI, finance, and utility endpoints via micropayments
Fit
Best for
- —Developers or agents wanting keyless, pay-per-use API access
- —x402-compatible wallets and autonomous agents on Base
- —Low-volume or sporadic API consumers who prefer no commitments
Not for
- —Users needing detailed API documentation or OpenAPI specs before integrating
- —High-volume consumers who need bulk pricing or rate-limit guarantees
- —Developers who cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/35 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is confirmed live with a valid 402 x402 challenge, but documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The purpose of this specific endpoint ('/api/v1/stripe/charges/35') is unclear beyond the generic 'Premium API Access' label.
Warnings
- —No API documentation available — /docs, /api, /pricing, and /README pages all render only 'Connect wallet'
- —No OpenAPI or schema definition found; request body and response format are unknown
- —The endpoint path '/api/v1/stripe/charges/35' suggests Stripe integration but no details are documented
- —Cannot verify what this specific endpoint actually does beyond the generic 'Premium API Access' description
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/stripe/charges/35
- —All endpoints are priced at $0.02/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
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/stripe/charges/35