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 31 via a pay-per-request x402 protocol on the Base network. It accepts POST requests and returns JSON. Payment is settled in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, with a maximum cost of $0.02 per call (20,000 base units at 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The endpoint is part of a broader platform at lowpaymentfee.com that offers 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. The specific endpoint at /api/v1/nfts/31/metadata appears to be an NFT metadata service, though the crawled documentation does not detail the exact schema of the returned metadata object or what NFT collection token 31 belongs to.
The endpoint was confirmed live via a 402 challenge response. The x402 challenge specifies version 1, the "exact" payment scheme, a 300-second timeout, and outputs application/json. No OpenAPI spec or detailed request/response schema was found in the crawl.
Capabilities
Use cases
- —Fetching metadata for a specific NFT (token 31) programmatically
- —Integrating NFT display data into wallets or marketplaces
- —Agent-driven NFT data retrieval with automatic micropayment
Fit
Best for
- —Developers needing on-demand NFT metadata without API key management
- —AI agents that can settle x402 payments on Base
- —Applications requiring low-cost, pay-per-call NFT data access
Not for
- —Bulk retrieval of metadata across many NFT collections (only token 31 is exposed at this path)
- —Users who cannot settle USDC payments on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/31/metadata \
-H "X-PAYMENT: <x402-payment-proof>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no documented request body schema, no example response, and no description of what NFT collection or data is returned. The crawl pages beyond the homepage were mostly empty wallet-connect prompts.
Warnings
- —No OpenAPI or detailed schema available — request and response formats are unknown.
- —The specific NFT collection and token 31 context are undocumented; the metadata content is unclear.
- —Most site pages (pricing, README, /api) returned only a 'Connect wallet' prompt with no useful documentation.
Citations
- —Endpoint returns 402 with x402 version 1 challenge, accepting USDC on Base with maxAmountRequired of 20000 base unitshttps://lowpaymentfee.com/api/v1/nfts/31/metadata
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/nfts/31/metadata
- —Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com