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 90 at `https://lowpaymentfee.com/api/v1/nfts/90/metadata`. It is part of a broader suite of pay-per-request APIs hosted on lowpaymentfee.com, all settling payments in USDC on the Base network via the x402 protocol. The endpoint accepts POST requests and returns JSON.
Pricing is straightforward: the x402 challenge advertises a `maxAmountRequired` of 20,000 base units of USDC (contract `0x8335…2913` on Base). Since USDC uses 6 decimals, this equals $0.02 per request — consistent with the site-wide flat rate of $0.02/request advertised on the landing page. No API keys, subscriptions, or rate limits are required; callers simply attach an `X-PAYMENT` header with a valid x402 payment proof.
The provider's landing page lists additional API categories (data/analytics, AI/ML, finance/Web3, infrastructure utilities), all at the same $0.02 price point. This specific endpoint falls under the NFT/Web3 category. Documentation beyond the landing page is sparse — the /api, /pricing, and /README routes all resolve to a "Connect wallet" prompt with no further detail. No OpenAPI spec or request/response schema was found, so the exact structure of the returned NFT metadata is unknown.
Capabilities
Use cases
- —Fetching metadata for a specific NFT (token 90) programmatically
- —Integrating NFT display data into wallets or marketplaces
- —Agent-driven NFT data retrieval with automatic micropayment
Fit
Best for
- —Developers needing NFT metadata without API key management
- —AI agents that can settle x402 payments on Base
- —Low-volume, on-demand NFT data lookups
Not for
- —Bulk retrieval of metadata across many token IDs (only token 90 path documented)
- —Users who cannot settle USDC payments on Base
- —Applications requiring detailed OpenAPI documentation or guaranteed SLAs
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/90/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 request/response schema, no documentation beyond a landing page listing, and no example payloads. The specific NFT metadata content is entirely unknown.
Warnings
- —No OpenAPI or schema documentation available — request and response formats are unknown.
- —Only token ID 90 is referenced in this endpoint path; unclear if other token IDs are supported via different paths.
- —Landing page docs (/api, /pricing, /README) all resolve to a 'Connect wallet' stub with no useful content.
- —Provider identity and terms of service are not documented.
Citations
- —The x402 challenge advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network.https://lowpaymentfee.com/api/v1/nfts/90/metadata
- —Site-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —The provider lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request.https://lowpaymentfee.com