Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3, and utility services. All endpoints are settled on the Base network using USDC, with a uniform price of $0.02 per request. The x402 protocol means no API keys, no accounts, and no rate limits — callers simply attach an X-PAYMENT header with a signed USDC payment to each request.
The specific endpoint at `/api/v1/payments/93` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USDC, i.e., $0.02) on the Base network. The payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.
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 price point. However, 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 material.
Capabilities
Use cases
- —Accessing premium API endpoints without creating accounts or managing API keys
- —Making one-off API calls with per-request USDC micropayments on Base
- —Agent-driven workflows that need frictionless, programmatic API access with crypto settlement
Fit
Best for
- —Developers who want zero-signup, pay-as-you-go API access
- —AI agents that need to autonomously purchase API calls via x402
- —Users already holding USDC on the Base network
Not for
- —Users who need detailed API documentation or request/response schemas before integrating
- —High-volume consumers who prefer subscription or bulk pricing over per-call payments
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/payments/93 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <signed-x402-payment-header>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The purpose of this specific '/payments/93' endpoint is unclear beyond the generic 'Premium API Access' label. Effectively a stub listing.
Warnings
- —No OpenAPI or schema documentation available — request and response formats are unknown.
- —Docs, API, pricing, and README pages all render only 'Connect wallet' with no technical content.
- —The specific purpose of /api/v1/payments/93 ('Premium API Access') is not documented; it is unclear what data or service it provides.
- —No request body schema or response examples are available from any crawled source.
Citations
- —Uniform pricing of $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 (0.02 USDC) on Base network with 300-second timeouthttps://lowpaymentfee.com/api/v1/payments/93
- —Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/payments/93