Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.
The specific endpoint at `/api/v1/orders/81` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. 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, gas estimates, geocoding, validation, conversion, and data export, all at the same $0.02 price point.
Documentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The exact functionality behind the `/api/v1/orders/81` path is unclear; the generic "Premium API Access" label does not describe what data or service it provides. Prospective callers should be aware that without documented input/output schemas, integration requires experimentation or contacting the provider directly.
Capabilities
Use cases
- —Accessing API services without creating accounts or managing API keys
- —Making one-off API calls with instant USDC micropayments on Base
- —Agent-driven workflows that need frictionless pay-per-request access
Fit
Best for
- —Developers who want zero-signup API access via crypto payments
- —AI agents that can autonomously pay for API calls using x402
- —Users already on the Base network with USDC who want low-friction API consumption
Not for
- —Teams needing well-documented APIs with full OpenAPI specs and examples
- —Users without USDC on Base network or unfamiliar with x402 protocol
- —Production systems requiring guaranteed SLAs and support
Quick start
# POST with x402 payment header (pseudo-example)
curl -X POST https://lowpaymentfee.com/api/v1/orders/81 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming it accepts payments. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no description of what '/api/v1/orders/81' actually returns. The listing is effectively a stub.
Warnings
- —No documentation available — /docs, /pricing, /api, and /README pages all render only 'Connect wallet'
- —No OpenAPI or schema definition found for any endpoint
- —The specific purpose of /api/v1/orders/81 ('Premium API Access') is undocumented and unclear
- —No request body schema or response examples are available
Citations
- —The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/orders/81
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/orders/81
- —Documentation pages (/docs, /pricing, /api, /README) show only 'Connect wallet'https://lowpaymentfee.com/docs