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 a given token (in this case token ID 100) via a POST request. Payment is settled on the Base network using USDC (contract 0x8335…2913) through the x402 exact-payment scheme. The advertised price is $0.02 per request (maxAmountRequired of 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 provider hosts a broader suite of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints share the same $0.02/request pricing and x402 payment model on Base.
Documentation is minimal: there is no OpenAPI spec, no request/response schema beyond the x402 challenge's outputSchema stub, and the crawled /api, /pricing, and /README pages all resolve to a wallet-connect prompt with no further content. The specific structure of the NFT metadata response is unknown. Callers should expect a JSON response (mimeType: application/json) but will need to discover the exact schema experimentally.
Capabilities
Use cases
- —Retrieving on-chain NFT metadata without managing API keys
- —Programmatic access to NFT token details for marketplace or portfolio apps
- —Agent-driven NFT data lookups with instant micropayment settlement
Fit
Best for
- —Developers wanting keyless, pay-as-you-go NFT metadata access
- —AI agents that can settle x402 payments on Base
- —Projects needing low-cost per-call NFT data without subscriptions
Not for
- —High-volume bulk NFT metadata scraping (no documented batch endpoint)
- —Users who need detailed API documentation or guaranteed SLAs
- —Applications requiring non-USDC or non-Base payment rails
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/100/metadata \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_proof>"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 request/response schema, no documentation beyond a landing page listing, and the /api, /pricing, /README pages are empty wallet-connect stubs. The actual NFT metadata format is entirely unknown.
Warnings
- —No OpenAPI or schema documentation available — response format must be discovered experimentally
- —The /api, /pricing, and /README pages return only a wallet-connect prompt with no useful content
- —The specific NFT collection and token ID space served by this endpoint are undocumented
- —Provider appears to be a demo/showcase site; reliability and data quality are unverified
Citations
- —Endpoint returns 402 with x402 challenge advertising USDC on Base at maxAmountRequired 20000https://lowpaymentfee.com/api/v1/nfts/100/metadata
- —All endpoints priced at $0.02/request with no API keys, no rate limits, on Base networkhttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/nfts/100/metadata