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 marketplace 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/73` 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). Payment is made via the x402 exact scheme with no API keys, rate limits, or subscriptions required.
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 listed endpoints share the same $0.02/request pricing. However, documentation beyond the landing page is effectively empty — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content.
The specific `/api/v1/trades/73` endpoint does not clearly map to any of the advertised categories, and no schema or documentation describes what input it expects or what output it returns. The endpoint is live (returns a valid 402 challenge), but without request/response schemas or examples, its actual functionality remains unknown.
Capabilities
Use cases
- —Paying per-request for API data without API keys or subscriptions
- —Integrating x402-compatible agents with low-cost data endpoints
- —Accessing trade-related data via micropayment-gated endpoints
Fit
Best for
- —Developers building x402-native agent workflows
- —Users who want pay-as-you-go API access without accounts
- —Testing x402 protocol integrations at low cost
Not for
- —Users needing detailed API documentation or schemas before integrating
- —High-volume use cases where per-request payment overhead is impractical
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/trades/73 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge with clear pricing, but there is no documentation, no request/response schema, no examples, and the endpoint path (/api/v1/trades/73) does not match any advertised category. Effectively a stub listing.
Warnings
- —No API documentation available — docs, pricing, and README pages all render only 'Connect wallet' with no content.
- —The endpoint /api/v1/trades/73 is not listed among the advertised endpoints on the landing page; its purpose is unclear.
- —No request or response schema is provided; callers cannot know what input to send or what output to expect.
- —No OpenAPI spec or ai-plugin manifest found.
Citations
- —The x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/trades/73
- —All listed endpoints are priced at $0.02 per request with no API keys, rate limits, or minimumshttps://lowpaymentfee.com
- —The platform advertises endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —Docs, API, pricing, and README pages render only a 'Connect wallet' prompthttps://lowpaymentfee.com/docs