Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. All endpoints are pay-per-request using USDC on the Base network, with no API keys, no rate limits, and no commitments required.
The specific endpoint at `/api/v1/charges/180` is listed as "Premium API Access" and accepts POST requests. The x402 challenge indicates a maximum charge of 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme, settling directly on-chain to the provider's wallet.
The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 per request price point. However, documentation beyond the landing page is essentially empty (all sub-pages only show "Connect wallet"), so the actual request/response schemas for individual endpoints are unknown. The specific functionality behind the `/api/v1/charges/180` path is not documented and may be a generic or demo endpoint rather than a distinct service.
Capabilities
Use cases
- —Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management
- —Fetching real-time crypto quotes, gas estimates, and exchange rates on a per-call basis
- —Running geocoding, validation, or data conversion tasks with instant pay-per-use billing
- —Integrating pay-per-request data analytics and reporting into agent workflows
Fit
Best for
- —Agents needing low-friction, keyless API access paid in USDC on Base
- —Developers who want per-call billing with no subscription or rate limits
- —Web3-native applications that can settle micropayments on-chain
Not for
- —High-volume production workloads where $0.02/request adds up significantly
- —Users who need detailed API documentation and guaranteed SLAs
- —Applications requiring fiat-only payment rails
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/charges/180 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC on Base at $0.02/request. However, there is no documentation for request/response schemas, no OpenAPI spec, and all doc/pricing/API pages are empty stubs showing only 'Connect wallet'. The specific purpose of /api/v1/charges/180 is unclear beyond the generic 'Premium API Access' label.
Warnings
- —No documentation available — all sub-pages (docs, api, pricing, README) return only 'Connect wallet' with no content
- —The specific endpoint /api/v1/charges/180 has no documented request or response schema; its actual functionality is unknown
- —The platform lists many endpoint categories but none have verifiable documentation or examples
- —No OpenAPI specification or ai-plugin manifest found
Citations
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (USD Coin) on Base networkhttps://lowpaymentfee.com/api/v1/charges/180
- —Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —Documentation pages are empty, showing only 'Connect wallet'https://lowpaymentfee.com/docs