Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utilities at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. 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/94` 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`. Payment is sent to `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.
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. However, no OpenAPI schema, detailed documentation, or example request/response payloads were found during crawling; the docs, pricing, and README pages all returned only a "Connect wallet" prompt with no further content.
Capabilities
Use cases
- —Querying real-time financial data (prices, exchange rates, gas estimates) without API key management
- —Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-call basis
- —Geocoding, data validation, and format conversion as lightweight utility calls
- —Agents autonomously purchasing API access via x402 payment protocol
Fit
Best for
- —AI agents that need frictionless, keyless API access with crypto micropayments
- —Developers prototyping with multiple API categories without subscription commitments
- —Low-volume or bursty workloads where pay-per-request is more economical than a subscription
Not for
- —High-volume production workloads where bulk pricing or rate-limit guarantees are needed
- —Users who cannot transact in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/messages/94 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The x402 challenge is live and confirms pricing and network details, but there is no OpenAPI schema, no documentation beyond a landing page listing, no example requests or responses, and the specific purpose of /api/v1/messages/94 is unclear. Most detail is inferred from the homepage listing.
Warnings
- —No OpenAPI or schema documentation available — endpoint behavior must be discovered experimentally.
- —The specific purpose of /api/v1/messages/94 ('Premium API Access') is not explained anywhere in the crawled content.
- —Docs, pricing, and README pages returned only 'Connect wallet' with no substantive content.
- —No example request or response payloads are available to confirm what this endpoint actually returns.
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02.https://lowpaymentfee.com/api/v1/messages/94
- —The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.https://lowpaymentfee.com
- —Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.https://lowpaymentfee.com