NFT metadata endpoint on Base, pay-per-call via x402 with USDC at $0.02/request.
What it does
This endpoint at lowpaymentfee.com serves NFT metadata for token ID 1 via a POST request, gated by the x402 payment protocol. Each call costs $0.02 in USDC on the Base network (maxAmountRequired of 20,000 base units with 6 decimals = $0.02). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof to access the resource.
The provider's landing page advertises a broad suite of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 data (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request, settled in USDC on Base. However, this specific listing covers only the `/api/v1/nfts/1/metadata` endpoint, which returns NFT metadata as application/json.
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 returned only a "Connect wallet" prompt with no further content. The actual structure of the NFT metadata response is unknown. The endpoint is confirmed live (402 challenge captured successfully).
Capabilities
Use cases
- —Retrieving on-chain NFT metadata without managing API keys
- —Agent-driven NFT data lookups with micropayment settlement
- —Integrating NFT metadata into wallets or marketplaces via x402
Fit
Best for
- —Agents or apps that need NFT metadata with zero-setup authentication
- —Developers wanting pay-per-call access without subscriptions
- —x402-compatible clients on the Base network
Not for
- —Bulk NFT metadata retrieval across many token IDs (only token 1 is documented)
- —Users who need detailed API documentation or response schemas before integrating
- —Non-crypto workflows that cannot settle USDC payments on Base
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/1/metadata \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming pricing and network. However, there is no OpenAPI spec, no documented request body schema, no example response, and the crawled pages beyond the landing page are empty. The actual NFT metadata content and request parameters are entirely unknown.
Warnings
- —No OpenAPI or schema documentation available — request and response formats are unknown.
- —Only token ID 1 is referenced in this endpoint path; it is unclear whether other token IDs are supported.
- —Crawled /api, /pricing, and /README pages returned no useful content (only 'Connect wallet').
- —The provider lists many other API categories on the landing page but none have documented schemas.
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 in USDC on Base network.https://lowpaymentfee.com/api/v1/nfts/1/metadata
- —All endpoints are listed at $0.02 per request with no API keys, no rate limits, and instant access on Base.https://lowpaymentfee.com
- —The asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 corresponds to USDC on Base.https://lowpaymentfee.com/api/v1/nfts/1/metadata