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 91 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 settles on-chain using USDC (contract 0x8335…2913) on Base.
The endpoint is part of a broader API platform at lowpaymentfee.com that offers dozens of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure categories — 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 x402 challenge confirms the endpoint is live, accepting the "exact" payment scheme with a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02. The payment is directed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. No OpenAPI schema or detailed documentation for the response body was found beyond the generic "Premium API Access" description and application/json MIME type.
Capabilities
Use cases
- —Retrieving metadata for NFT token ID 91 programmatically
- —Integrating NFT metadata into a dApp or marketplace without API key management
- —Agent-driven NFT data retrieval with automatic micropayment settlement
Fit
Best for
- —Developers needing NFT metadata with zero-signup access
- —AI agents that can settle x402 payments on Base
- —Applications requiring on-demand NFT data without rate limits
Not for
- —Bulk retrieval of metadata for large NFT collections (single token ID only)
- —Users who cannot settle USDC payments on Base network
- —Free-tier or API-key-based authentication workflows
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/91/metadata \
-H "X-PAYMENT: <x402-payment-proof>" \
-H "Content-Type: application/json"Endpoint
Quality
The x402 challenge is live and confirms pricing and network details, but there is no OpenAPI schema, no documented request/response body, and no information about what metadata fields are returned. The endpoint is narrowly scoped to a single NFT token ID with no broader documentation.
Warnings
- —No OpenAPI or response schema available — response structure is unknown
- —Endpoint is specific to NFT token ID 91; unclear if other token IDs are supported at similar paths
- —No crawled documentation beyond the landing page listing; /api, /pricing, and /README pages returned only a wallet-connect prompt
- —The actual content/utility of the returned NFT metadata is unverified
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/nfts/91/metadata
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/nfts/91/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 and payTo address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3https://lowpaymentfee.com/api/v1/nfts/91/metadata