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/174` is listed as "Premium API Access" and accepts POST requests. The x402 challenge advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request given USDC's 6 decimals.
The broader platform organizes its APIs into four categories: 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 listed endpoints share the same $0.02/request pricing with no API keys, no rate limits, and no minimum commitments required.
Documentation is extremely sparse — the docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/trades/174` endpoint specifically returns. The endpoint is live (returns a valid 402 challenge), but without documentation it is unclear what input parameters are expected or what the response payload looks like.
Capabilities
Use cases
- —Accessing trade data or premium content behind a per-call micropayment wall
- —Programmatic agents purchasing API responses without pre-registration or API keys
- —Exploring x402 protocol integration for pay-per-use API consumption
Fit
Best for
- —Developers experimenting with x402 micropayment-gated APIs
- —AI agents that need keyless, pay-per-call API access on Base
- —Users who want to avoid subscriptions and pay only per request
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Anyone without a Base-compatible USDC wallet
Quick start
# The endpoint requires an X-PAYMENT header with a valid x402 payment proof.
# Using curl as a conceptual example (actual payment header must be constructed per x402 spec):
curl -X POST https://lowpaymentfee.com/api/v1/trades/174 \
-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 documentation, no OpenAPI schema, no request/response examples, and the specific purpose of /api/v1/trades/174 is undocumented. The docs, pricing, and README pages are all blank beyond a wallet-connect prompt. This is effectively a stub listing.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'
- —No OpenAPI or schema describing request parameters or response format for /api/v1/trades/174
- —The specific purpose and data returned by the /api/v1/trades/174 endpoint is unknown
- —No request or response examples available anywhere in the crawled material
Citations
- —The x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/trades/174
- —All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform offers APIs in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/trades/174