Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. The specific path `/api/v1/trades/90` suggests a trades or financial data endpoint, though the exact response payload is not documented. The provider operates a broader platform offering dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network.
Payment is handled inline via the x402 protocol: callers send a POST request, receive a 402 challenge with payment details, and include an `X-PAYMENT` header with a signed USDC payment to complete the call. The challenge specifies a max amount of 20,000 base units of USDC (6 decimals), which equals $0.02. The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the USDC contract on Base (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). No API keys or rate limits are advertised; access is purely payment-gated.
Documentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content. The exact input parameters and response schema for `/api/v1/trades/90` are unknown. The endpoint is confirmed live (402 challenge captured successfully), but without documentation or example responses, integrators will need to experiment to determine the expected request body and response format.
Capabilities
Use cases
- —Fetching trade or financial data on a per-call basis without subscription commitments
- —Agent-driven programmatic access to premium data endpoints using crypto micropayments
- —Integrating pay-as-you-go financial APIs into Web3 applications
Fit
Best for
- —Developers wanting no-signup, payment-only API access
- —AI agents with USDC on Base that need on-demand data
- —Projects needing low-cost per-request financial data without rate limits
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Developers without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/trades/90 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <signed-x402-payment-header>"Endpoint
Quality
The endpoint is confirmed live via a valid 402 x402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no input/output schema, no example requests or responses, and the specific purpose of /api/v1/trades/90 is undocumented. The docs pages returned only wallet-connect prompts. This is effectively a stub listing.
Warnings
- —No documentation available — all doc/API/pricing/README pages return only a 'Connect wallet' prompt with no content
- —The exact purpose, input parameters, and response schema of /api/v1/trades/90 are unknown
- —The broader platform lists many endpoints but none have documented schemas or examples
- —Cannot verify what data this endpoint actually returns without making a paid request
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/trades/90
- —USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/trades/90
- —All APIs 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 APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com