NFT metadata endpoint on Base, pay-per-call via x402 with USDC at $0.02/request.
What it does
This x402-enabled endpoint serves NFT metadata for token ID 71 at `https://lowpaymentfee.com/api/v1/nfts/71/metadata`. It is part of a broader suite of pay-per-request APIs offered by lowpaymentfee.com, all settling payments on the Base network using USDC. The endpoint accepts POST requests and returns JSON.
The x402 challenge confirms the endpoint is live, requiring a maximum of 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per request — consistent with the site's advertised flat pricing of $0.02/request across all endpoints. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.
The provider's landing page lists additional API categories including data/analytics, AI/ML (sentiment, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation) — all at the same $0.02 price point. No API keys or rate limits are advertised. However, the specific endpoint in this listing is scoped to NFT metadata, and no documentation exists describing the request body schema or the structure of the returned metadata. The lack of OpenAPI specs, examples, or detailed docs limits confidence in what this endpoint actually returns.
Capabilities
Use cases
- —Retrieving metadata for a specific NFT (token 71) programmatically
- —Integrating NFT display data into wallets or marketplaces without API keys
- —Agent-driven NFT data retrieval with automatic micropayment settlement
Fit
Best for
- —Developers needing keyless, pay-per-call NFT metadata access
- —AI agents that can settle x402 payments on Base
- —Quick prototyping without signup or rate-limit concerns
Not for
- —Bulk retrieval of metadata across many NFT collections (only token 71 is exposed at this path)
- —Users who need detailed API documentation or OpenAPI schemas before integrating
- —Non-crypto workflows that cannot settle USDC on Base
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/71/metadata \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_header>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, no documentation on what the NFT metadata contains, and the crawled pages beyond the landing page returned only 'Connect wallet' with no useful content. This is effectively a stub listing.
Warnings
- —No OpenAPI or schema documentation available for this endpoint
- —No example request body or response structure documented anywhere
- —The endpoint is scoped to a single NFT token ID (71); unclear if other token IDs are available at similar paths
- —Crawled /api, /pricing, and /README pages returned no meaningful content
Citations
- —The x402 challenge requires maxAmountRequired of 20000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equating to $0.02https://lowpaymentfee.com/api/v1/nfts/71/metadata
- —The site advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The provider lists additional API categories including Data & Analytics, AI & ML, Finance & Web3, and Infrastructure utilitieshttps://lowpaymentfee.com