Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utilities at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.
The specific endpoint at `/api/v1/messages/59` is listed as "Premium API Access." Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6-decimal precision. The endpoint accepts HTTP POST and returns `application/json`. Payment is sent to `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.
The broader platform advertises sibling endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. However, no OpenAPI schema, detailed documentation, or example request/response payloads are available from the crawled pages, so the exact input parameters and response shapes for this particular endpoint remain unknown.
Capabilities
Use cases
- —Accessing premium API content with per-call USDC micropayments on Base
- —Agent-driven workflows that need keyless, on-demand API access
- —Testing x402 payment flows against a live, low-cost endpoint
Fit
Best for
- —Developers experimenting with x402 payment protocol
- —AI agents that need frictionless pay-per-call API access without credentials
- —Low-volume consumers who want no subscription or minimum commitment
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —High-throughput production workloads where per-call crypto settlement adds latency
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/messages/59 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{}'Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming pricing and network. However, there is no OpenAPI schema, no documentation beyond a landing page listing, no example requests or responses, and the purpose of '/api/v1/messages/59' specifically is unclear. The listing is essentially a stub with confirmed liveness.
Warnings
- —No OpenAPI or schema documentation available — input parameters and response format are unknown.
- —The specific purpose of /api/v1/messages/59 ('Premium API Access') is not explained anywhere in the crawled material.
- —Sibling endpoints listed on the homepage were not individually probed; their liveness is unconfirmed.
- —The /api, /pricing, and /README pages returned only a 'Connect wallet' prompt with no useful content.
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/messages/59
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/messages/59
- —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 endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com