NFT metadata endpoint on Base, pay-per-call via x402 with USDC at $0.02/request.
What it does
This endpoint at lowpaymentfee.com serves NFT metadata for token ID 50 via a POST request, gated by the x402 payment protocol. Each call costs $0.02 in USDC on the Base network (maxAmountRequired of 20,000 base units with 6 decimals = $0.02). No API keys or accounts are needed — callers attach an X-PAYMENT header with a valid x402 payment proof and receive JSON metadata in return.
The provider hosts a broader suite of pay-per-call APIs across categories including data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, gas estimates), and infrastructure utilities (geocoding, validation, conversion). All endpoints share the same $0.02/request pricing model, no rate limits, and no minimum commitments. Settlement occurs on the Base L2 network using USDC (contract 0x8335…2913).
This specific endpoint returns NFT metadata in application/json format. The exact schema of the returned metadata is not documented, and no OpenAPI spec or detailed docs were found. The provider's site is largely a listing page with wallet-connect functionality but minimal technical documentation.
Capabilities
Use cases
- —Fetching on-chain NFT metadata for display in wallets or marketplaces
- —Programmatic retrieval of NFT attributes for indexing or analytics
- —Agent-driven NFT data lookups without pre-registration or API keys
Fit
Best for
- —Agents needing NFT metadata without account setup
- —Developers wanting pay-as-you-go NFT data access on Base
- —Low-volume or sporadic NFT metadata queries
Not for
- —Bulk retrieval of metadata for large NFT collections (no batch endpoint documented)
- —Use cases requiring detailed API documentation or OpenAPI schemas
- —Free-tier or zero-cost NFT metadata needs (every call costs $0.02)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/50/metadata \
-H "X-PAYMENT: <x402-payment-proof>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, no examples, and the crawled pages beyond the landing page returned only 'Connect wallet' with no useful content. The specific NFT metadata structure is entirely unknown.
Warnings
- —No OpenAPI or schema documentation available for this endpoint
- —Response body structure for NFT metadata is undocumented
- —Provider pages (/api, /pricing, /README) returned no useful content beyond 'Connect wallet'
- —It is unclear what NFT collection token ID 50 belongs to or what metadata fields are returned
Citations
- —Endpoint returns 402 with x402 challenge requiring USDC payment on Base networkhttps://lowpaymentfee.com/api/v1/nfts/50/metadata
- —maxAmountRequired is 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) which equals $0.02https://lowpaymentfee.com/api/v1/nfts/50/metadata
- —All APIs priced at $0.02/request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com