Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API platform that hosts a collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header to each request.
The specific endpoint at `/api/v1/messages/85` is listed as "Premium API Access." Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts HTTP POST and returns `application/json`. The broader platform also exposes 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.
Documentation beyond the landing page is sparse: the /api, /pricing, and /README pages all resolve to a "Connect wallet" prompt with no additional technical detail. No OpenAPI spec, request/response schemas, or usage examples are published. Because of this, the exact input format and response structure for `/api/v1/messages/85` (and most other endpoints) must be discovered experimentally.
Capabilities
Use cases
- —Agent-driven data retrieval with per-call USDC micropayments
- —On-demand AI inference (sentiment, summarization, classification, embeddings) without API keys
- —Fetching real-time crypto quotes and gas estimates via pay-as-you-go endpoints
- —Geocoding and data conversion utilities for automated pipelines
Fit
Best for
- —Developers or agents wanting zero-signup, pay-per-use API access
- —Crypto-native workflows that can attach x402 payment headers
- —Low-volume or bursty workloads where subscription pricing is wasteful
Not for
- —High-volume production use cases needing SLAs, rate-limit guarantees, or detailed documentation
- —Users without a Base-network USDC wallet or x402-compatible client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/messages/85 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>" \
-d '{}'Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and no examples. The purpose of '/api/v1/messages/85' specifically is opaque — 'Premium API Access' is a generic label. Effectively a stub listing.
Warnings
- —No OpenAPI or schema documentation available for any endpoint
- —The /api, /pricing, and /README pages return only a 'Connect wallet' prompt with no useful content
- —The specific purpose and expected input/output of /api/v1/messages/85 is undocumented
- —No request or response examples could be sourced
Citations
- —The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all priced at $0.02/requesthttps://lowpaymentfee.com
- —Pricing is $0.02 per request with no API keys, no rate limits, and instant access on the Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/messages/85