Pay-per-call API suite on Base (USDC) covering messaging, AI, finance, and utilities at $0.02/request.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog 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. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header to each request.
The specific endpoint at `/api/v1/messages/160` is listed as "Premium API Access." Its x402 challenge advertises a maximum amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts HTTP POST and returns `application/json`. The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a timeout of 300 seconds.
The broader platform advertises additional 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. Documentation beyond the landing page is sparse; the /api, /pricing, and /README pages all resolve to a "Connect wallet" prompt with no further detail. Without OpenAPI specs or example request/response schemas, the exact input parameters and response formats for this endpoint remain unclear.
Capabilities
Use cases
- —Sending or retrieving messages via a pay-per-call model without API key management
- —Integrating low-cost, crypto-settled API calls into agent workflows
- —Accessing a variety of utility, AI, and finance endpoints from a single provider
Fit
Best for
- —Developers who want keyless, per-request billing via x402
- —AI agents that can autonomously pay for API calls with USDC on Base
- —Projects needing low-friction access to multiple endpoint categories at uniform pricing
Not for
- —Users who need detailed API documentation and typed schemas before integrating
- —High-volume consumers who need bulk pricing or subscription discounts
- —Teams that cannot settle payments in USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/messages/160 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>" \
-d '{}'Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no documented request/response schema, no examples, and the /api, /pricing, and /README pages are all empty beyond a wallet-connect prompt. The purpose of the specific /messages/160 endpoint is opaque.
Warnings
- —No OpenAPI or schema documentation available — request and response formats are unknown.
- —The /api, /pricing, and /README pages contain no useful content beyond 'Connect wallet'.
- —The exact purpose and parameters of /api/v1/messages/160 are undocumented; 'Premium API Access' is the only description.
- —The broader catalog of endpoints (AI, finance, utilities) is advertised but none have been individually verified.
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/messages/160
- —USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/messages/160
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com