Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.
What it does
lowpaymentfee.com offers a collection of x402-enabled API endpoints settled in USDC on the Base network. The specific endpoint at `/api/resource/10` is labeled "Premium API Access" and costs up to $0.02 per request (maxAmountRequired of 20,000 base units of USDC, which is 6-decimal, equaling $0.02). No API keys or rate limits are advertised — callers simply attach an x402 payment header to each request.
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 listed endpoints share the same $0.02/request pricing.
Documentation is extremely thin — 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 example payloads available. The x402 challenge is live and well-formed, but without documentation it is unclear what request body `/api/resource/10` expects or what it returns beyond `application/json`.
Capabilities
Use cases
- —Agents that need on-demand API access without pre-registration or API keys
- —Pay-per-call analytics, AI inference, or financial data retrieval settled in USDC
- —Programmatic access to utility services (geocoding, validation, conversion) with crypto micropayments
Fit
Best for
- —Developers or agents wanting zero-signup, pay-as-you-go API access
- —Use cases requiring small, infrequent API calls where $0.02/request is economical
- —Base-network USDC holders looking for native crypto-settled services
Not for
- —High-volume production workloads where $0.02/request adds up quickly without bulk discounts
- —Users who need detailed API documentation, SDKs, or guaranteed SLAs before integrating
Quick start
curl -X POST https://lowpaymentfee.com/api/resource/10 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, and all documentation pages render only 'Connect wallet' with no usable content. The specific purpose of /api/resource/10 is undocumented.
Warnings
- —No OpenAPI or schema documentation available — request/response formats for /api/resource/10 are unknown
- —All doc pages (/docs, /pricing, /api, /README) return only a 'Connect wallet' prompt with no content
- —The purpose and expected input of /api/resource/10 specifically is not documented; 'Premium API Access' is a generic label
- —Cannot verify that the advertised AI, analytics, finance, and utility endpoints actually function — only /api/resource/10 was probed
Citations
- —Endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/resource/10
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/resource/10
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com
- —Documentation pages render only 'Connect wallet' with no further contenthttps://lowpaymentfee.com/docs