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 45 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 rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof to receive the JSON response.
The provider, lowpaymentfee.com, hosts a broader suite of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 data (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints share the same $0.02/request pricing model and settle on the Base network using USDC.
This specific endpoint returns NFT metadata in application/json format. The x402 challenge confirms the endpoint is live, uses the "exact" payment scheme, and accepts USDC (contract 0x8335…2913) on Base. The payment recipient is 0x1A2B…85F3 with a 300-second timeout window. No OpenAPI schema or detailed documentation for the response body was found, so the exact structure of the returned metadata is unknown.
Capabilities
Use cases
- —Retrieving on-chain NFT metadata for display in wallets or marketplaces
- —Programmatic NFT metadata lookups by AI agents with autonomous payment
- —Integrating NFT data into dApps without managing API keys
Fit
Best for
- —Agents or apps that need NFT metadata with zero-setup access
- —Developers wanting pay-as-you-go NFT data without subscriptions
- —x402-compatible clients on the Base network
Not for
- —Bulk NFT metadata scraping across thousands of tokens (only token 45 endpoint documented)
- —Users who need free or subscription-based access without per-call crypto payments
- —Non-Base-network USDC holders who cannot settle on Base
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/45/metadata \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The x402 challenge is live and confirms pricing, network, and asset details. However, there is no OpenAPI schema, no response body documentation, no example requests or responses, and the endpoint is specific to a single NFT token ID (45) with no explanation of what metadata it returns.
Warnings
- —No OpenAPI or response schema available — the structure of the returned NFT metadata is unknown
- —Only token ID 45 is documented at this endpoint; it is unclear whether other token IDs are supported at similar paths
- —The /api, /pricing, and /README pages returned only a 'Connect wallet' prompt with no useful documentation
- —The provider description 'Premium API Access' is generic and does not describe the actual data returned
Citations
- —The endpoint returns HTTP 402 with x402 challenge requiring USDC payment on Base networkhttps://lowpaymentfee.com/api/v1/nfts/45/metadata
- —maxAmountRequired is 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) which equals $0.02https://lowpaymentfee.com/api/v1/nfts/45/metadata
- —All endpoints on the platform are priced at $0.02/request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The provider offers APIs across data analytics, AI/ML, finance/Web3, and infrastructure categorieshttps://lowpaymentfee.com