x402-gated NFT data endpoint on Base, pay $0.02 per request in USDC.
What it does
This endpoint at `/api/v1/nfts/18` is part of the lowpaymentfee.com platform, a collection of x402-protocol pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. The specific resource appears to serve NFT-related data (inferred from the URL path `/nfts/18`), though the provider's landing page does not explicitly list this particular endpoint among its advertised APIs. The endpoint is live and returns a valid x402 challenge.
Payment is settled on the Base network using USDC (contract `0x8335…2913`) via the "exact" scheme. The `maxAmountRequired` is 20,000 base units, which at 6 decimals equals $0.02 per request. No API keys or rate limits are advertised — callers simply attach an `X-PAYMENT` header with a valid x402 payment proof. The response MIME type is `application/json` and the endpoint accepts HTTP POST.
The broader lowpaymentfee.com platform advertises a uniform $0.02/request pricing model across all its endpoints, with categories including sentiment analysis, text summarization, embeddings, price feeds, gas estimates, geocoding, and more. However, documentation is extremely sparse: no OpenAPI spec, no request/response schema details, and no examples are provided for any endpoint. The actual data returned by `/api/v1/nfts/18` is unknown beyond the JSON content type.
Capabilities
Use cases
- —Fetching NFT metadata or details for token ID 18 via a single paid API call
- —Integrating pay-per-request NFT data into an agent workflow without managing API keys
- —Programmatic access to NFT information settled in USDC on Base
Fit
Best for
- —Developers wanting zero-signup, pay-per-call NFT data access
- —AI agents that can settle x402 payments autonomously on Base
- —Prototyping workflows that need on-demand NFT information without subscription commitments
Not for
- —High-volume NFT data ingestion where per-call costs add up quickly
- —Users who need detailed documentation or guaranteed SLAs before integrating
- —Anyone needing data beyond what this single NFT endpoint provides (broader NFT collection queries, etc.)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/18 \
-H "X-PAYMENT: <x402-payment-proof>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation for this specific NFT endpoint, and the landing page doesn't even list /api/v1/nfts/18 among its advertised APIs. The actual functionality is entirely inferred from the URL path.
Warnings
- —The /api/v1/nfts/18 endpoint is not listed on the provider's landing page among advertised APIs — its existence and purpose are inferred solely from the URL path.
- —No request body schema or response schema is documented anywhere; callers have no way to know what to send or what to expect back.
- —No OpenAPI spec, README, or detailed docs were found — /pricing, /api, and /README pages all returned only a 'Connect wallet' prompt.
- —The broader platform lists many endpoint categories but provides zero technical documentation for any of them.
Citations
- —The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Basehttps://lowpaymentfee.com/api/v1/nfts/18
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/nfts/18
- —Platform advertises $0.02/request uniform pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The landing page lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories but does not include /api/v1/nfts/18https://lowpaymentfee.com