Pay-per-call API platform on Base (USDC) via x402 — data, AI, finance, and utility endpoints at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/transfers/158` is listed as "Premium API Access" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol: callers attach an `X-PAYMENT` header with a signed payment proof, and the server verifies it before returning the response. No API keys, accounts, or rate limits are advertised.
The broader platform advertises four endpoint 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 listed at the same $0.02/request price point. The x402 challenge confirms the endpoint is live, accepts POST requests, and pays to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base.
Documentation is extremely sparse — the docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/transfers/158` endpoint actually returns. The endpoint path suggests a transfer or transaction resource, but its actual functionality is unknown from available materials.
Capabilities
Use cases
- —Programmatic access to paid API endpoints without account registration
- —Agent-driven API consumption with per-call USDC micropayments on Base
- —Accessing data, AI, finance, or utility services via x402 protocol
Fit
Best for
- —Developers or agents wanting no-signup, pay-as-you-go API access
- —x402-compatible wallets and agents on the Base network
- —Low-cost micropayment API experimentation
Not for
- —Users needing detailed API documentation or guaranteed SLAs
- —Applications requiring free or subscription-based pricing models
- —Non-crypto payment workflows
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/transfers/158 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The x402 challenge is live and confirms pricing and network details, but there is zero documentation on what this specific endpoint does, no request/response schema, and no examples. The docs pages are empty. The endpoint path 'transfers/158' is opaque. This is effectively a stub listing.
Warnings
- —No documentation available — all doc/pricing/API pages render only 'Connect wallet' with no content
- —No OpenAPI or request/response schema provided for this endpoint
- —The purpose of /api/v1/transfers/158 ('Premium API Access') is entirely unclear from available materials
- —The broader platform lists many endpoint categories but none have documented schemas or examples
Citations
- —Endpoint returns 402 with x402 challenge requiring X-PAYMENT header, confirming it is livehttps://lowpaymentfee.com/api/v1/transfers/158
- —Price is $0.02 per request (maxAmountRequired 20000 base units USDC, 6 decimals)https://lowpaymentfee.com/api/v1/transfers/158
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/transfers/158
- —Platform advertises no API keys, no rate limits, instant access, $0.02/request across all endpointshttps://lowpaymentfee.com
- —Docs, pricing, API, and README pages show only 'Connect wallet' with no additional contenthttps://lowpaymentfee.com/docs