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 54 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 price is 20,000 base units of USDC (6 decimals), which equals $0.02 per request.
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 infrastructure utilities — all priced uniformly at $0.02 per call. The platform advertises no API keys, no rate limits, and instant access; payment is the only authentication mechanism, settled on-chain via USDC on Base (contract 0x8335…2913).
The specific resource at `/api/v1/nfts/54/metadata` is not documented beyond its x402 challenge. The response schema is not provided, so the exact metadata fields returned are unknown. The endpoint is live and returns a well-formed 402 challenge with x402 version 1, a 300-second payment timeout, and an "exact" payment scheme.
Capabilities
Use cases
- —Fetching metadata for a specific NFT (token 54) programmatically
- —Integrating NFT display data into a dApp or marketplace UI
- —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 autonomously
- —Low-volume, on-demand NFT data lookups
Not for
- —Bulk retrieval of metadata across many NFT collections (only token 54 is served at this path)
- —Users who cannot transact in USDC on Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/54/metadata \
-H "X-PAYMENT: <x402-payment-proof>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is no documentation on request body format, response schema, or what metadata is actually returned. The listing title is generic ('Premium API Access') and the endpoint path suggests a single NFT token. No OpenAPI spec or examples are available.
Warnings
- —No response schema or example response documented — actual metadata fields are unknown.
- —Endpoint serves metadata for a single NFT (token ID 54); unclear if other token IDs are available at sibling paths.
- —No OpenAPI specification or detailed docs found for this endpoint.
- —The broader platform lists many API categories but crawled pages beyond the homepage returned only 'Connect wallet' with no content.
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network.https://lowpaymentfee.com/api/v1/nfts/54/metadata
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.https://lowpaymentfee.com/api/v1/nfts/54/metadata
- —Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access.https://lowpaymentfee.com