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 39 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 micropayment protocol.
The provider's landing page lists a broad catalog of endpoints spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation) — all priced at $0.02 per request on the Base network. However, the specific endpoint being listed here is scoped to NFT metadata retrieval. The response MIME type is application/json.
Documentation is minimal. There is no OpenAPI spec, no request/response schema beyond the x402 challenge's outputSchema stub, and no example payloads. The endpoint is confirmed live (returns HTTP 402 with a valid x402 challenge). The provider accepts payments to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a maximum timeout of 300 seconds.
Capabilities
Use cases
- —Retrieve metadata for a specific NFT (token 39) programmatically
- —Integrate pay-per-call NFT data into agent workflows without API key management
- —Fetch NFT attributes/properties for display in wallets or marketplaces
Fit
Best for
- —Agents or apps needing on-demand NFT metadata without subscription overhead
- —Developers experimenting with x402 micropayment-gated APIs
- —Low-volume or sporadic NFT metadata lookups at $0.02 per call
Not for
- —High-volume NFT indexing where a dedicated indexer (e.g., Alchemy, Moralis) is more cost-effective
- —Querying metadata for arbitrary token IDs (this endpoint is scoped to token 39)
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/39/metadata \
-H "X-PAYMENT: <x402_payment_token>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request body schema, no response examples, and no documentation beyond the landing page's generic catalog listing. The endpoint is narrowly scoped to a single NFT token ID with no explanation of what metadata is returned.
Warnings
- —No OpenAPI or request/response schema available — callers must discover payload format by trial
- —Endpoint is scoped to a single NFT token ID (39); unclear if other token IDs are supported at different paths
- —Landing page lists many endpoint categories but none have detailed documentation
- —No robots.txt or agents.txt found
Citations
- —Maximum amount required is 20,000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/nfts/39/metadata
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/nfts/39/metadata
- —All endpoints priced at $0.02 per request with no API keys, no rate limitshttps://lowpaymentfee.com
- —Payment timeout is 300 seconds, payTo address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3https://lowpaymentfee.com/api/v1/nfts/39/metadata