x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-protocol API platform that gates access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/trades/80` is listed as "Premium API Access" and accepts POST requests. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…), which equals $0.02 per request (USDC uses 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The broader platform advertises four categories of endpoints: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request 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 example payloads available. The specific functionality of the `/api/v1/trades/80` endpoint (what "trades" data it returns, what input it expects) is not documented anywhere in the crawled material. The endpoint is live and returning a valid 402 challenge, but without documentation it is difficult to know what to send or what to expect back.
Capabilities
Use cases
- —Accessing trade data via a single micropayment without needing an API key or subscription
- —Programmatic agents purchasing API responses on-demand using x402 protocol
- —Integrating pay-per-call data endpoints into automated workflows on Base
Fit
Best for
- —Developers experimenting with x402 micropayment protocols
- —Agents that need keyless, pay-per-request API access
- —Users who want to avoid subscription commitments for occasional API calls
Not for
- —Production workloads requiring well-documented request/response schemas
- —Users who need detailed API documentation or SDKs before integrating
Quick start
# The endpoint returns 402 with an x402 challenge.
# Use an x402-compatible client to attach payment.
curl -X POST https://lowpaymentfee.com/api/v1/trades/80 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_proof>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the specific purpose of /api/v1/trades/80 is undocumented. Pricing is clear ($0.02/request in USDC on Base), but the lack of any functional documentation makes this a stub-level listing.
Warnings
- —No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'
- —No OpenAPI or schema specification found
- —The specific functionality of /api/v1/trades/80 is undocumented; 'Premium API Access' is the only description
- —No example request or response payloads available
- —Cannot verify what data the endpoint actually returns
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/trades/80
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —Documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompthttps://lowpaymentfee.com/docs