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 37 from the lowpaymentfee.com platform. It is part of a broader suite of pay-per-request APIs offered by the same provider, spanning data analytics, AI/ML inference, finance/Web3, and utility services. All endpoints use the x402 payment protocol, settling in USDC on the Base network.
The specific endpoint at `/api/v1/nfts/37/metadata` accepts POST requests and returns JSON. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). Payment is made via the `exact` scheme with a 300-second timeout. No API keys or rate limits are advertised; access is gated entirely by the x402 micropayment.
Documentation is minimal — the provider's landing page lists available endpoints and pricing but does not provide request/response schemas, example payloads, or detailed descriptions of what the NFT metadata contains. The endpoint is live and returning a valid 402 challenge, but without further documentation it is unclear what fields the metadata response includes or whether additional input parameters are supported in the POST body.
Capabilities
Use cases
- —Retrieving metadata for NFT token #37 programmatically
- —Integrating NFT display data into a dApp or marketplace
- —Demonstrating x402 micropayment-gated API access
Fit
Best for
- —Developers needing on-demand NFT metadata without API key management
- —Agents or bots that can settle USDC micropayments on Base
- —Exploring x402 protocol integration patterns
Not for
- —Bulk retrieval of metadata for large NFT collections (single-token endpoint, no batch support documented)
- —Users who cannot transact in USDC on Base network
- —Applications requiring detailed schema documentation or SLA guarantees
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/37/metadata \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, there is no OpenAPI schema, no documented request/response format, no examples, and the NFT metadata content is entirely unspecified. The listing is effectively a stub with confirmed liveness and pricing.
Warnings
- —No request or response schema documented — POST body format and metadata fields are unknown.
- —Only a single NFT token ID (37) is addressed by this endpoint; unclear if other token IDs are available at similar paths.
- —Provider landing page offers many API categories but none have detailed documentation beyond a title and price.
- —No robots.txt or agents.txt found; no OpenAPI spec available.
Citations
- —The x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base with a 300-second timeout.https://lowpaymentfee.com/api/v1/nfts/37/metadata
- —USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.https://lowpaymentfee.com/api/v1/nfts/37/metadata
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com