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-enabled API platform that exposes a broad catalog of endpoints across four categories: Data & Analytics (metrics, reports, 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 pay-per-call at $0.02 each, settled in USDC on the Base network via the x402 protocol.
The specific endpoint `/api/v1/trades/134` is listed under "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. Payment is made via the x402 exact scheme with a 300-second timeout. No API keys or rate limits are advertised; access is instant once payment is included in the X-PAYMENT header.
Documentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no additional technical content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The endpoint name "trades/134" suggests it may return trade-related data (possibly a specific trade record), but the exact request format and response structure are unknown.
Capabilities
Use cases
- —Fetching trade data on-demand without API key registration
- —Integrating pay-per-call data endpoints into autonomous agents
- —Accessing AI inference (sentiment, summarization, classification) with per-request USDC payments
- —Querying crypto gas estimates or token quotes via micropayments
Fit
Best for
- —AI agents needing keyless, pay-per-call API access
- —Developers who want to avoid subscription commitments for occasional API calls
- —Web3-native applications that can settle payments in USDC on Base
Not for
- —High-volume use cases where $0.02/request adds up significantly versus subscription pricing
- —Users who need detailed API documentation or SDKs before integrating
- —Applications requiring non-crypto payment methods
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/trades/134 \
-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 works. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The purpose of '/api/v1/trades/134' is unclear beyond the generic 'Premium API Access' label.
Warnings
- —No API documentation available — /docs, /api, /pricing, and /README pages all render only 'Connect wallet'
- —No OpenAPI or schema definition found for any endpoint
- —The specific purpose and expected input/output of /api/v1/trades/134 is undocumented
- —The endpoint path 'trades/134' with a numeric ID suggests a specific resource, but it's unclear what trade data it returns or what POST body it expects
Citations
- —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 x402 challenge requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with 300-second timeouthttps://lowpaymentfee.com/api/v1/trades/134
- —The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com