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 80 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 a JSON response.
The provider operates a broader platform offering dozens of pay-per-call APIs across categories including data analytics, AI/ML inference, finance/Web3, and infrastructure utilities, all priced at $0.02 per request. This specific endpoint falls under the NFT/Web3 category and returns metadata for a particular NFT (ID 80). The exact schema of the returned metadata is not documented, but the endpoint advertises application/json as its MIME type.
Payment settles on Base to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The x402 challenge specifies a 300-second timeout and exact payment scheme. The endpoint is live and returning a proper 402 challenge.
Capabilities
Use cases
- —Retrieving metadata for NFT token ID 80 programmatically
- —Integrating NFT metadata into a dApp or marketplace UI
- —Agents that need on-chain NFT information without API key management
Fit
Best for
- —Developers needing quick, keyless access to NFT metadata
- —AI agents that can settle micropayments via x402 on Base
- —Projects that want pay-per-call pricing without subscriptions
Not for
- —Bulk retrieval of metadata across many NFT collections (only serves token 80)
- —Users who need free or subscription-based access
- —Querying NFTs on networks other than Base
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/80/metadata \
-H "X-PAYMENT: <x402-payment-proof>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge. However, there is no OpenAPI schema, no documentation of the request body or response format, and no example responses. The specific NFT metadata content is unknown. The broader site lists many endpoints but provides no detailed docs for any of them.
Warnings
- —No documentation of request body schema or response format for this endpoint
- —Only serves metadata for a single NFT (token ID 80) — unclear if other token IDs are available at different paths
- —No OpenAPI spec or detailed API docs found on the provider site
- —The broader platform lists many endpoints but crawled pages beyond the homepage returned only 'Connect wallet' with no content
Citations
- —Endpoint returns HTTP 402 with x402 challenge requiring USDC payment on Basehttps://lowpaymentfee.com/api/v1/nfts/80/metadata
- —maxAmountRequired is 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02https://lowpaymentfee.com/api/v1/nfts/80/metadata
- —Platform pricing is $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Payment timeout is 300 seconds with exact payment schemehttps://lowpaymentfee.com/api/v1/nfts/80/metadata