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-protocol API marketplace that gates access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/trades/161` is listed as "Premium API Access" and costs up to $0.02 per call (maxAmountRequired of 20,000 base units of USDC, which has 6 decimals = $0.02). Payment is handled via the x402 exact scheme — callers attach an X-PAYMENT header with a signed payment to the payTo address, and the server fulfills the request upon verification.
The broader platform advertises four categories of APIs: 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). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments.
However, the specific endpoint `/api/v1/trades/161` does not clearly map to any of the documented categories on the landing page. The "trades" path suggests a finance or trading-related resource, but no further documentation, request schema, or response schema is available. The docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content. Without request/response schemas or documentation, callers must experiment to determine what this endpoint accepts and returns.
Capabilities
Use cases
- —Accessing trade-related data or executing trade operations via a single paid API call
- —Integrating pay-per-request endpoints into autonomous agent workflows without API key management
- —Programmatic access to financial or trading resources settled on Base L2
Fit
Best for
- —Developers wanting keyless, pay-per-call API access on Base
- —AI agents that can settle x402 micropayments autonomously
- —Users who prefer no-commitment, usage-based pricing
Not for
- —Users needing detailed API documentation or guaranteed SLAs before integrating
- —High-volume consumers who need bulk pricing or subscription plans
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/trades/161 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <signed-x402-payment-token>"Endpoint
Quality
The endpoint is live (returns a valid 402 x402 challenge), and pricing is clear at $0.02/request in USDC on Base. However, there is no documentation, no request/response schema, no examples, and the /trades/161 path is not explained anywhere on the site. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub listing.
Warnings
- —No request or response schema available — callers cannot know what to send or what to expect
- —The /api/v1/trades/161 path does not appear in the site's documented API catalog
- —All documentation pages (docs, API, pricing, README) returned only 'Connect wallet' with no content
- —The purpose of this specific endpoint (trades/161) is unclear — 'Premium API Access' is a generic label
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 in USDC on Basehttps://lowpaymentfee.com/api/v1/trades/161
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/trades/161
- —All endpoints listed at $0.02/request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categorieshttps://lowpaymentfee.com