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 endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint is priced at $0.02 per request, paid in USDC on the Base network via the x402 payment protocol. There are no API keys, no rate limits, and no sign-up — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The specific endpoint at `/api/v1/payments/360` is listed as "Premium API Access." The x402 challenge confirms it is live, accepting POST requests and requiring up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is settled to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.
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 beyond the landing page is essentially empty (all sub-pages just show "Connect wallet"), so the actual request/response schemas for this and other endpoints are unknown. Without docs or an OpenAPI spec, callers will need to experiment to discover accepted input formats and response structures.
Capabilities
Use cases
- —Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management
- —Fetching real-time crypto token quotes and gas estimates via micropayment
- —Running geocoding or data validation calls with per-request USDC payment
- —Exporting analytics data or generating reports on demand
Fit
Best for
- —Developers who want instant API access without sign-up or subscription
- —Agents and bots that can settle x402 payments autonomously on Base
- —Low-volume or sporadic API consumers who prefer pay-per-use over monthly plans
Not for
- —High-volume production workloads where $0.02/request adds up significantly
- —Users who need detailed API documentation and guaranteed SLAs before integrating
- —Developers without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/payments/360 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>" \
-d '{}'Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation (all doc pages are blank), no request/response schema, and the purpose of this specific '/payments/360' endpoint is entirely opaque beyond the label 'Premium API Access.' The listing is effectively a stub.
Warnings
- —No API documentation available — all doc/pricing/README pages return only 'Connect wallet' with no content.
- —No OpenAPI or output schema provided; request and response formats are unknown.
- —The specific purpose of /api/v1/payments/360 ('Premium API Access') is unclear — it may be a generic or placeholder endpoint.
- —Cannot verify what data or service this endpoint actually returns without making a paid request.
Citations
- —Endpoint returns 402 with x402 challenge requiring up to 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/payments/360
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/payments/360
- —Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com