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 "Premium API Access" via the x402 payment protocol on the Base network. The specific resource path `/api/v1/trades/186` suggests a trade-data or financial-trade endpoint, though the exact response payload is not documented. The site advertises a broad catalog of x402-gated APIs spanning data & analytics, AI/ML inference, finance & Web3, and infrastructure utilities — all priced at $0.02 per request, settled in USDC on Base.
The x402 challenge confirms the endpoint is live, accepting POST requests and requiring an exact-scheme payment of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals → $0.02). Payment is sent to address 0x1A2B…85F3 with a 300-second timeout. No API key or account registration is needed; callers simply attach a valid X-PAYMENT header to authorize each request.
Documentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no description of what the `/api/v1/trades/186` endpoint actually returns. The listing is functional but essentially undocumented beyond the payment challenge metadata.
Capabilities
Use cases
- —Fetching trade or financial data on a per-request payment basis without needing an API key
- —Integrating x402-compatible agents that autonomously pay for data access
- —Prototyping pay-per-call workflows using USDC on Base
Fit
Best for
- —Agents or bots that support x402 payment protocol
- —Developers wanting zero-signup, pay-per-use data access
- —Low-volume or sporadic API consumers who prefer no subscriptions
Not for
- —Users who need detailed API documentation or response schemas before integrating
- —High-volume consumers who need bulk pricing or rate-limit guarantees
- —Anyone without a Base-network USDC wallet or x402-compatible client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/trades/186 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing, but there is zero documentation on what the endpoint accepts or returns. No OpenAPI spec, no example requests/responses, and the docs pages are empty. The specific purpose of /api/v1/trades/186 is unknown.
Warnings
- —No documentation available — /docs, /pricing, /api, and /README all show only 'Connect wallet' with no content
- —No OpenAPI or schema describing request parameters or response format for /api/v1/trades/186
- —The exact nature of the data returned by this endpoint is undocumented and unclear
- —No robots.txt or agents.txt present
Citations
- —Endpoint returns HTTP 402 with x402 challenge, maxAmountRequired 20000 USDC base units on Basehttps://lowpaymentfee.com/api/v1/trades/186
- —Site advertises $0.02 per request, no API keys, no rate limits, Base networkhttps://lowpaymentfee.com
- —USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/trades/186