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 resource path `/api/v1/trades/140` suggests a trades-related data endpoint, though the provider's site does not document this particular path in detail. The broader lowpaymentfee.com platform advertises a suite of APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no commitments.
The x402 challenge confirms the endpoint is live and accepts POST requests. Payment is settled on-chain using USDC (contract 0x8335…2913) on Base, with a maximum amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). The payment scheme is "exact," meaning each call requires a single micropayment. The timeout is 300 seconds.
Documentation beyond the landing page is extremely thin — 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 examples for the `/api/v1/trades/140` endpoint specifically. The exact data returned by this trades endpoint is unknown and must be discovered by making a paid request.
Capabilities
Use cases
- —Fetching trade data for a specific trade ID via a single micropayment
- —Integrating pay-per-call trade lookups into an AI agent workflow
- —Accessing premium financial data without API key registration
Fit
Best for
- —Agents or bots that need on-demand trade data without subscription overhead
- —Developers experimenting with x402 micropayment-gated APIs
- —Low-volume consumers who prefer pay-per-use over monthly plans
Not for
- —High-volume consumers needing bulk trade data at lower per-unit cost
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/trades/140 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation for the /api/v1/trades/140 path, no request/response schema, no examples, and the docs pages are empty. The specific purpose of this trades endpoint is unknown.
Warnings
- —No documentation available — /docs, /pricing, /api, and /README all return only a wallet-connect prompt
- —No OpenAPI or schema for request/response of /api/v1/trades/140
- —The exact data returned by this endpoint is undocumented and must be discovered empirically
- —The /api/v1/trades/140 path is not listed among the provider's advertised API catalog on the landing page
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Basehttps://lowpaymentfee.com/api/v1/trades/140
- —All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/trades/140