Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.
The specific endpoint at `/api/v1/payments/43` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is "exact" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.
The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, 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 actual functionality behind this specific `/payments/43` endpoint and the other listed endpoints cannot be verified from the crawled material.
Capabilities
Use cases
- —Agents needing on-demand API access without pre-registration or API keys
- —Programmatic access to utility or data endpoints with per-call USDC micropayments
- —Testing x402 payment protocol integrations on Base network
Fit
Best for
- —Developers exploring x402 payment protocol
- —Agents that need keyless, pay-as-you-go API access
- —Low-volume callers who want no commitments or subscriptions
Not for
- —Users needing well-documented APIs with clear request/response schemas
- —High-volume production workloads where per-call pricing adds up
- —Anyone requiring verified, auditable data sources
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/payments/43 \
-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 accepts payments. However, there is no documentation, no OpenAPI spec, no request/response examples, and the docs/pricing/README pages are all blank beyond a wallet connect prompt. The actual functionality of this specific endpoint is unknown — 'Premium API Access' is not descriptive. This is effectively a stub listing.
Warnings
- —No OpenAPI spec or schema documentation available
- —Docs, pricing, API, and README pages all render only 'Connect wallet' with no content
- —The actual functionality behind /api/v1/payments/43 ('Premium API Access') is undocumented and unverifiable
- —No request body schema or response schema is documented anywhere
- —The broad claims about AI, analytics, finance endpoints cannot be verified from crawled content
Citations
- —Endpoint returns 402 with x402 challenge requesting 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/payments/43
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/payments/43
- —Docs, pricing, API, and README pages render only 'Connect wallet'https://lowpaymentfee.com/docs