NFT metadata endpoint on Base, payable per-call via x402 with USDC.
What it does
This endpoint at lowpaymentfee.com serves NFT metadata for token ID 17 via a POST request, gated behind the x402 payment protocol. Payment is settled in USDC on the Base network at $0.02 per request (20,000 base units of USDC with 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The broader lowpaymentfee.com platform advertises a 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 share the same $0.02/request pricing model and are settled on Base via USDC.
This specific endpoint (`/api/v1/nfts/17/metadata`) returns NFT metadata as JSON. The probe confirms the endpoint is live, returning a proper 402 challenge with x402 version 1. No OpenAPI schema, detailed documentation, or example responses were found in the crawl, so the exact structure of the returned metadata is unknown.
Capabilities
Use cases
- —Retrieving metadata for a specific NFT (token 17) programmatically
- —Integrating NFT display data into wallets or marketplaces without API key management
- —Agent-driven NFT data retrieval with automatic micropayment settlement
Fit
Best for
- —Developers needing NFT metadata without subscription overhead
- —AI agents that can settle x402 payments autonomously
- —Applications already operating on the Base network with USDC
Not for
- —Bulk retrieval of metadata across many NFT collections (only token 17 is exposed at this path)
- —Users who need free or OAuth-based API access
- —Production use cases requiring documented response schemas and SLAs
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/17/metadata \
-H "X-PAYMENT: <x402-payment-proof>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no example request/response, and no documentation beyond the landing page listing. The specific NFT metadata structure is entirely unknown.
Warnings
- —No OpenAPI or schema documentation available for this endpoint
- —Response format and fields are undocumented — the exact metadata structure for token 17 is unknown
- —Only a single NFT token ID (17) is exposed at this path; generalizability to other tokens is unclear
- —Crawled /api, /pricing, and /README pages returned only 'Connect wallet' with no useful content
Citations
- —The endpoint returns a 402 challenge with x402 version 1, accepting USDC on Base networkhttps://lowpaymentfee.com/api/v1/nfts/17/metadata
- —maxAmountRequired is 20000 base units of USDC (USD Coin, 6 decimals) = $0.02https://lowpaymentfee.com/api/v1/nfts/17/metadata
- —All APIs on the platform are priced at $0.02 per request with no API keys, no rate limitshttps://lowpaymentfee.com
- —The platform offers APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categorieshttps://lowpaymentfee.com