x402 pay-per-call API platform on Base with $0.02 USDC requests — no keys, no rate limits.
What it does
lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-call endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Every request costs $0.02 in USDC on the Base network, settled via the x402 exact-payment scheme. There are no API keys, no rate limits, and no sign-up required — callers simply attach an X-PAYMENT header with a valid payment proof.
The specific endpoint at `/api/v1/nfts/83` is listed as "Premium API Access." Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 (USDC uses 6 decimals). The endpoint accepts POST requests and returns application/json. Beyond the generic "Premium API Access" label, no further documentation describes what data this particular NFT-related endpoint returns.
The broader platform advertises 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 per-request price point. However, no OpenAPI schema, request/response examples, or detailed documentation were found for any endpoint, including this one.
Capabilities
Use cases
- —Fetching NFT-related data without needing an API key or account
- —Programmatic access to premium data via automated USDC micropayments on Base
- —Agent-driven workflows that need frictionless, keyless API access
Fit
Best for
- —Developers or agents with USDC on Base who want instant, keyless API access
- —Micropayment-native workflows where per-call billing is preferred over subscriptions
- —Exploring x402 protocol integrations in agent-to-agent commerce
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —High-volume consumers who would benefit from bulk/subscription pricing
- —Anyone without a Base-compatible wallet or USDC holdings
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/83 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and no documentation explaining what /api/v1/nfts/83 actually returns. The listing is effectively a stub with only the x402 challenge and a generic homepage to go on.
Warnings
- —No documentation found for /api/v1/nfts/83 — the endpoint's purpose and response format are unknown.
- —No OpenAPI spec, request schema, or response examples are available for any endpoint on the platform.
- —The /api, /pricing, and /README pages all returned only a 'Connect wallet' prompt with no useful content.
- —The 'Premium API Access' description is generic and does not clarify what data is served.
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/nfts/83
- —USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/nfts/83
- —Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructurehttps://lowpaymentfee.com