Pay-per-request premium API access on Base via x402, settled in USDC at $0.02/call.
What it does
lowpaymentfee.com is an x402-enabled API platform offering a broad catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. Each call costs $0.02 in USDC on the Base network, with no API keys, no rate limits, and no upfront commitments required. Payment is handled inline via the x402 protocol: callers attach an X-PAYMENT header with a signed USDC payment to the payTo address, and the endpoint returns the result.
The specific endpoint `/api/v1/orders/85` is listed as "Premium API Access" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The timeout for payment settlement is 300 seconds. No detailed input/output schema beyond the HTTP POST method is provided in the challenge or crawled documentation.
The broader platform advertises additional endpoints for 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 per request price point. Documentation pages (/docs, /pricing, /api, /README) all returned only a "Connect wallet" prompt with no substantive content, so the actual request/response formats for these endpoints remain undocumented.
Capabilities
Use cases
- —Accessing premium API data without signing up for an account or obtaining API keys
- —Making one-off paid API calls from autonomous agents using x402 USDC payments on Base
- —Integrating pay-as-you-go API access into Web3 applications
Fit
Best for
- —Developers wanting zero-friction, keyless API access via crypto micropayments
- —AI agents that can settle x402 payments autonomously on Base
- —Projects needing low-cost per-request API calls without subscriptions
Not for
- —Users who need detailed API documentation or OpenAPI schemas before integrating
- —High-volume consumers who prefer flat-rate or subscription pricing
- —Developers without access to USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/orders/85 \
-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, confirming it accepts USDC payments on Base at $0.02. However, there is no OpenAPI spec, no documented request/response schema, no examples, and all documentation pages are empty stubs showing only 'Connect wallet'. The purpose of this specific /orders/85 endpoint is unclear beyond the generic 'Premium API Access' label.
Warnings
- —All documentation pages (/docs, /pricing, /api, /README) return no useful content — only a 'Connect wallet' prompt.
- —No OpenAPI or input/output schema is available; request body format and response structure are unknown.
- —The specific purpose of /api/v1/orders/85 is unclear — it may be a demo or placeholder endpoint.
- —The broader catalog of endpoints (AI, analytics, finance, utils) is advertised but none were individually probed.
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base networkhttps://lowpaymentfee.com/api/v1/orders/85
- —The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on the Base networkhttps://lowpaymentfee.com
- —Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com
- —Documentation pages (/docs, /pricing, /api, /README) all returned only a 'Connect wallet' prompthttps://lowpaymentfee.com/docs