Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.
What it does
lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/policies/82` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The broader platform advertises multiple API categories including 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 priced at $0.02 per request and settle in USDC on Base.
However, the specific functionality behind `/api/v1/policies/82` ("Premium API Access") is not documented beyond its title. The crawled docs, pricing, and README pages all returned only a "Connect wallet" prompt with no additional technical documentation, schemas, or example payloads. Without further documentation it is unclear what data or service this particular endpoint returns when a valid payment is provided.
Capabilities
Use cases
- —Accessing premium API data without needing API key registration
- —Making one-off paid API calls settled in USDC on Base
- —Agent-driven workflows that need instant, keyless API access with crypto payment
Fit
Best for
- —Developers who want keyless, pay-as-you-go API access
- —AI agents that can settle x402 payments autonomously on Base
- —Users comfortable paying in USDC on the Base L2 network
Not for
- —Users who need detailed API documentation or guaranteed SLAs before purchasing
- —Developers who require fiat-only payment methods
- —High-volume consumers who need bulk pricing or subscription plans
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/policies/82 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC on Base at $0.02/call. However, there is no documentation for what /api/v1/policies/82 actually returns, no request/response schemas, and all doc pages render only a wallet-connect prompt. The listing is effectively a stub.
Warnings
- —No documentation available — all doc/pricing/README pages return only 'Connect wallet' with no content
- —The specific functionality of /api/v1/policies/82 ('Premium API Access') is completely undocumented
- —No request or response schema is provided; callers cannot know what to send or expect back
- —outputSchema only specifies HTTP POST method with no body or response details
Citations
- —Endpoint returns 402 with x402 challenge requesting up to 20,000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/policies/82
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/policies/82
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categorieshttps://lowpaymentfee.com