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 platform 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/charges/382` is labeled "Premium API Access" and requires a maximum of 20,000 base units of USDC (i.e., $0.02) per call. Payment is handled via the x402 exact scheme with no API keys, no rate limits, and no subscriptions required.
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 the same $0.02/request price point. The endpoint accepts HTTP POST requests and returns application/json responses.
Documentation is extremely sparse — the docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled content. The specific functionality behind the `/api/v1/charges/382` path is unclear; it may be a generic charge endpoint or a specific resource. Without documentation, the actual input parameters and response format cannot be determined.
Capabilities
Use cases
- —Paying per-call for data analytics or report generation without subscriptions
- —Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) via micropayments
- —Fetching crypto price feeds, exchange rates, or gas estimates on demand
- —Using utility services like geocoding or data validation with no account setup
Fit
Best for
- —Agents or developers wanting zero-signup, pay-as-you-go API access
- —Micropayment-native workflows on the Base L2 network
- —Prototyping or low-volume usage where subscription APIs are overkill
Not for
- —High-volume production workloads needing detailed SLAs and documentation
- —Users without a Base-compatible USDC wallet
- —Anyone requiring well-documented request/response schemas before integration
Quick start
# The endpoint returns 402 with an x402 challenge.
# Use an x402-compatible client to pay and access:
curl -X POST https://lowpaymentfee.com/api/v1/charges/382 \
-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 works. However, documentation is essentially nonexistent — all doc/pricing/API pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the specific purpose of /api/v1/charges/382 is unclear. This is effectively a stub listing.
Warnings
- —No documentation available — docs, pricing, API, and README pages all render only 'Connect wallet'
- —No OpenAPI or schema specification found
- —The specific functionality of /api/v1/charges/382 ('Premium API Access') is undefined — it is unclear what data it returns or what input it expects
- —No request or response examples available from any crawled source
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/charges/382
- —All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/charges/382