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 set of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Every request costs $0.02 in USDC on the Base network, paid inline via the x402 protocol — no API keys, no subscriptions, and no rate limits. The specific endpoint at `/api/v1/nfts/9` is listed as "Premium API Access" and appears to be an NFT-related resource, though its exact response payload is not documented.
The x402 challenge confirms the endpoint is live and accepts payments on Base using USDC (contract 0x8335…2913) with a max amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). Payments are sent to address 0x1A2B…85F3 with a 300-second timeout. The endpoint expects HTTP POST requests.
The platform advertises additional categories of endpoints including 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-call price point. However, no OpenAPI schema, detailed request/response documentation, or usage examples are available from the crawled pages. The exact input parameters and response format for `/api/v1/nfts/9` are unknown.
Capabilities
Use cases
- —Accessing NFT-related data via a single pay-per-call request without needing an API key
- —Integrating low-cost, keyless API calls into agent workflows on Base
- —Programmatic access to premium data behind x402 micropayment walls
Fit
Best for
- —Developers wanting zero-signup, pay-as-you-go API access
- —AI agents that can settle x402 payments autonomously on Base
- —Projects needing low-friction, per-call billing without subscriptions
Not for
- —Users who need detailed API documentation or OpenAPI specs before integrating
- —High-volume consumers who prefer bulk pricing or monthly plans
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/9 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response documentation, and no examples for the /api/v1/nfts/9 endpoint. The crawled pages beyond the landing page returned only 'Connect wallet' with no useful content. The exact purpose and payload of this specific endpoint are unknown.
Warnings
- —No OpenAPI or schema documentation available for any endpoint
- —The exact input parameters and response format for /api/v1/nfts/9 are undocumented
- —Most crawled subpages returned only 'Connect wallet' with no content
- —The endpoint name 'Premium API Access' is generic and does not describe the actual functionality
Citations
- —The endpoint returns a 402 challenge with x402Version 1, accepting USDC on Base with maxAmountRequired of 20000 base units ($0.02)https://lowpaymentfee.com/api/v1/nfts/9
- —The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on the Base networkhttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/nfts/9
- —The platform offers endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categorieshttps://lowpaymentfee.com