Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.
The specific endpoint at `/api/v1/customers/8` is listed as "Premium API Access" and returns `application/json` via POST. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The broader platform advertises additional endpoints including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point.
Documentation is extremely sparse: 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 usage examples available from the crawled material. The actual behavior and response format of the `/api/v1/customers/8` endpoint (and the other listed endpoints) cannot be determined from available information.
Capabilities
Use cases
- —Accessing data analytics and reports on a per-request basis without subscriptions
- —Running AI inference tasks (sentiment, summarization, classification, embeddings) with per-call USDC payments
- —Fetching financial data like token quotes, exchange rates, and gas estimates
- —Using utility services like geocoding, validation, and conversion via micropayments
Fit
Best for
- —Developers who want pay-per-use API access without API key management
- —Agents and bots that can settle payments in USDC on Base
- —Users who need low-cost, no-commitment access to a variety of API services
Not for
- —Users who need detailed API documentation or response schemas before integrating
- —High-volume consumers who would benefit from bulk pricing or subscription plans
- —Users who cannot transact in USDC on the Base network
Quick start
# x402 endpoint — send a POST with X-PAYMENT header
curl -X POST https://lowpaymentfee.com/api/v1/customers/8 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no documented request/response schemas, no examples, and all documentation pages render only a wallet-connect prompt. The actual functionality of /api/v1/customers/8 is unknown beyond its title 'Premium API Access'.
Warnings
- —No OpenAPI spec or schema documentation available
- —All doc pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content
- —The specific endpoint /api/v1/customers/8 has a generic 'Premium API Access' description — its actual purpose and response format are undocumented
- —Request body schema and response schema are completely unknown
- —The broader platform lists many endpoints but none have documented input/output contracts
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 (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/customers/8
- —Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —Documentation pages render only 'Connect wallet' with no further contenthttps://lowpaymentfee.com/docs