NFT metadata endpoint on Base, pay-per-call via x402 with USDC at $0.02/request.
What it does
This x402-enabled endpoint at lowpaymentfee.com serves NFT metadata for token ID 6 via a POST request. Payment is settled on the Base network using USDC (contract 0x8335…2913) through the x402 exact-payment scheme. The maximum amount required per call is 20,000 base units of USDC, which equals $0.02 (USDC uses 6 decimals). No API keys or rate limits are advertised; access is gated entirely by the x402 payment header.
The provider's landing page lists a broad catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all priced at $0.02 per request on the Base network. This specific endpoint falls under the NFT/Web3 category. The response MIME type is application/json, and the endpoint accepts POST requests as declared in the outputSchema.
Documentation is minimal: there is no OpenAPI spec, no request/response schema beyond the x402 challenge metadata, and the crawled /api, /pricing, and /README pages returned only a wallet-connect prompt with no additional content. The actual structure of the returned NFT metadata is unknown, so callers should expect a standard JSON object but cannot rely on a documented schema.
Capabilities
Use cases
- —Fetching on-chain NFT metadata for display in wallets or marketplaces
- —Programmatic retrieval of NFT attributes for indexing or analytics
- —Agent-driven NFT data lookups without pre-provisioned API keys
Fit
Best for
- —Agents needing keyless, pay-per-call NFT metadata access
- —Developers prototyping NFT integrations on Base
- —Low-volume, on-demand NFT metadata queries
Not for
- —Bulk or high-throughput NFT metadata indexing (no documented batch endpoint)
- —Querying NFTs on networks other than Base
- —Use cases requiring a fully documented response schema
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/6/metadata \
-H "X-PAYMENT: <x402_payment_header>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no documented request body schema, no example response, and the crawled pages beyond the landing page were empty wallet-connect prompts. Effectively a stub listing.
Warnings
- —No OpenAPI or request/response schema available — callers must discover the expected POST body experimentally.
- —The /api, /pricing, and /README pages returned no useful documentation (only wallet-connect prompts).
- —The actual NFT metadata response structure is undocumented.
- —The provider lists many endpoints but none have detailed docs; quality of service is unverifiable.
Citations
- —The x402 challenge requires 20,000 base units of USDC on Base network (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913).https://lowpaymentfee.com/api/v1/nfts/6/metadata
- —All APIs on the site are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network.https://lowpaymentfee.com
- —The endpoint accepts POST requests and returns application/json as declared in the x402 outputSchema.https://lowpaymentfee.com/api/v1/nfts/6/metadata