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/93` is listed as "Premium API Access" and accepts POST requests. The x402 challenge advertises a maximum amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request given USDC's 6 decimal places.
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 endpoints are uniformly priced at $0.02 per request 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 spec, no request/response schema documentation, and no example payloads available. The specific functionality behind `/api/v1/trades/93` is unclear; the path suggests trade data retrieval but no schema or description beyond the generic title is provided. The endpoint is confirmed live via a valid 402 challenge response.
Capabilities
Use cases
- —Accessing trade data behind a per-call micropayment without needing API keys
- —Programmatic agents purchasing API access on-the-fly via x402 protocol
- —Exploring x402 payment-gated API patterns on Base network
Fit
Best for
- —Developers experimenting with x402 micropayment protocols
- —AI agents that need keyless, pay-per-call API access
- —Users who want to avoid subscription commitments for occasional API calls
Not for
- —Production workloads requiring documented request/response schemas
- —Users who need detailed API documentation or SDKs before integrating
- —High-volume consumers who would benefit from bulk pricing or subscriptions
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/trades/93 \
-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, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific purpose of /api/v1/trades/93 is undocumented. This is effectively a stub listing.
Warnings
- —No OpenAPI or schema documentation available for this endpoint
- —The /docs, /pricing, /api, and /README pages all render only 'Connect wallet' with no technical content
- —The specific functionality of /api/v1/trades/93 ('Premium API Access') is not described anywhere
- —Request body format and response structure are completely unknown
Citations
- —The endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/trades/93
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The platform offers APIs in Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/trades/93