NFT metadata endpoint on Base, pay-per-call via x402 with USDC at $0.02/request.
What it does
This endpoint serves NFT metadata for token ID 22 via a pay-per-request x402 protocol on the Base network. The caller sends a POST request with an X-PAYMENT header containing a USDC payment proof, and receives JSON metadata in return. The payment is settled on-chain using USDC (contract 0x8335…2913) on Base.
The endpoint is part of a broader platform at lowpaymentfee.com that offers dozens of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per request. The platform advertises no API keys, no rate limits, and instant access; authentication and billing are handled entirely through the x402 payment challenge.
The specific resource at `/api/v1/nfts/22/metadata` returns NFT metadata as application/json. The x402 challenge specifies a maxAmountRequired of 20000 base units of USDC (6 decimals), which equals $0.02. The payment recipient is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3. No OpenAPI schema or detailed documentation for the response body was found beyond the MIME type declaration.
Capabilities
Use cases
- —Retrieving metadata for NFT token #22 programmatically
- —Integrating NFT display data into wallets or marketplaces
- —Agent-driven NFT data lookup with automatic micropayment
Fit
Best for
- —Agents or apps that need on-demand NFT metadata without API key management
- —Developers testing x402 payment flows on Base
- —Low-volume, pay-as-you-go NFT data retrieval
Not for
- —Bulk retrieval of metadata across many NFT collections (single token ID only)
- —Users who need free or subscription-based access without per-call crypto payments
- —Querying NFT metadata on networks other than Base
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/22/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 schema, no documented request body format, no example response, and the endpoint serves metadata for a single hardcoded NFT token ID. The crawled pages beyond the landing page returned only 'Connect wallet' with no useful documentation.
Warnings
- —No OpenAPI or response schema available — the shape of the returned NFT metadata is unknown.
- —Endpoint is scoped to a single NFT token ID (22); unclear if other token IDs are available at similar paths.
- —No documentation pages were accessible (pricing, README, and API pages all returned only 'Connect wallet').
- —The broader platform lists many API categories but none were verified beyond the landing page descriptions.
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/nfts/22/metadata
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/nfts/22/metadata
- —Platform advertises $0.02/request, no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —Payment recipient is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3https://lowpaymentfee.com/api/v1/nfts/22/metadata