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 59 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 spanning data analytics, AI/ML inference, finance/Web3 data, and utility services, all priced uniformly at $0.02 per request. The specific endpoint at /api/v1/nfts/59/metadata appears to return metadata for a particular NFT, though the exact schema of the response body is not documented. The platform advertises no minimums, no commitments, and instant access.
Because there is no OpenAPI spec, no response schema documentation, and no example responses available, the actual structure and content of the returned NFT metadata is unknown. Callers should expect a JSON object but will need to discover the fields empirically. The x402 challenge was successfully captured (HTTP 402 with valid accepts array), confirming the endpoint is live.
Capabilities
Use cases
- —Retrieving metadata for NFT token 59 from this provider
- —Integrating NFT display data into a dApp or marketplace UI
- —Agent-driven NFT data lookup with micropayment settlement
Fit
Best for
- —Developers needing quick, keyless access to specific NFT metadata
- —Agents that can settle x402 payments in USDC on Base
- —Low-volume or sporadic NFT metadata lookups without subscription overhead
Not for
- —Bulk retrieval of metadata across many NFT collections (only serves token 59)
- —Users who need free or pre-authenticated NFT metadata (e.g., direct on-chain tokenURI calls)
- —Applications requiring documented, stable response schemas
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/59/metadata \
-H "X-PAYMENT: <x402-payment-proof>" \
-H "Content-Type: application/json"Endpoint
Quality
The x402 challenge is live and well-formed, confirming the endpoint exists and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no response schema, no example responses, and no documentation beyond the landing page listing. The specific NFT metadata content is entirely undocumented.
Warnings
- —No OpenAPI or response schema available — response structure must be discovered empirically
- —Endpoint is scoped to a single NFT (token ID 59); unclear if other token IDs are available at similar paths
- —No documentation beyond the homepage listing; /api, /pricing, and /README pages all just show 'Connect wallet'
Citations
- —The endpoint returns HTTP 402 with x402 challenge advertising USDC payment on Base at maxAmountRequired 20000 (=$0.02)https://lowpaymentfee.com/api/v1/nfts/59/metadata
- —Platform pricing is $0.02 per request with no API keys, no rate limits, and no minimumshttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/nfts/59/metadata