x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.
What it does
This endpoint at lowpaymentfee.com provides a collection of pay-per-call APIs gated via the x402 protocol on the Base network. The specific endpoint `/api/v1/trades/19` is listed as "Premium API Access" and accepts POST requests. Payment is settled in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base. The maximum amount required per call is 20,000 base units, which at 6 decimals equals $0.02 USD. No API keys, rate limits, or upfront commitments are needed — callers simply attach an x402 payment header.
The broader lowpaymentfee.com platform advertises multiple API categories at the same $0.02/request price point: 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). However, the specific `/api/v1/trades/19` endpoint does not clearly map to any of these listed categories, and no documentation or schema is available describing its request body or response format. The docs, pricing, and API pages all render only a "Connect wallet" prompt with no further content.
Because there is no OpenAPI spec, no request/response examples, and no documentation beyond the landing page listing, the actual functionality of this particular endpoint remains unclear. Callers should be prepared to experiment or contact the provider for details.
Capabilities
Use cases
- —Accessing premium data or trade information via a single micropayment per request
- —Agent-driven API consumption without pre-registration or API key management
- —Programmatic pay-as-you-go access to web3-gated services
Fit
Best for
- —Developers wanting zero-signup, pay-per-call API access
- —AI agents that can settle x402 payments autonomously on Base
- —Users who prefer USDC micropayments over subscription billing
Not for
- —Users needing detailed API documentation or guaranteed SLAs before integrating
- —High-volume consumers who need bulk pricing or rate-limit guarantees
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/trades/19 \
-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 is operational. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and the specific endpoint '/api/v1/trades/19' is not described anywhere on the site. The purpose and data returned are unknown.
Warnings
- —No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content.
- —The endpoint path '/api/v1/trades/19' does not appear in the site's listed API catalog, so its function is unclear.
- —No request body schema or response schema is provided; callers must guess or reverse-engineer the interface.
- —No OpenAPI or ai-plugin manifest found.
Citations
- —The x402 challenge returns maxAmountRequired of 20000 in USDC (6 decimals) on Base, equaling $0.02 per request.https://lowpaymentfee.com/api/v1/trades/19
- —The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.https://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.https://lowpaymentfee.com/api/v1/trades/19
- —Docs, pricing, API, and README pages render only a 'Connect wallet' prompt with no further content.https://lowpaymentfee.com/docs