Query NFT ownership data via x402 micropayment on Base for $0.02 per request.
What it does
This endpoint at lowpaymentfee.com returns the owner of NFT #43 via a pay-per-call x402 protocol. The endpoint accepts POST requests and is settled on the Base network using USDC (contract 0x8335…2913). Each call costs a maximum of 0.02 USDC (20,000 base units with 6 decimals). No API keys, accounts, 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 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 priced at $0.02 per request on the same x402 model. However, this specific listing covers only the `/api/v1/nfts/43/owner` NFT ownership endpoint.
The endpoint is live and returns a proper 402 challenge with x402 version 1. Documentation beyond the landing page is sparse — the /api, /pricing, and /README pages all resolve to a minimal "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no example request/response payloads, and no description of the response schema, so the exact shape of the returned data must be discovered by making a paid call.
Capabilities
Use cases
- —Verify the current owner of a specific NFT programmatically
- —Integrate NFT ownership checks into automated agent workflows
- —Build dashboards or alerts that track NFT ownership changes
Fit
Best for
- —Agents needing on-demand NFT ownership data without managing API keys
- —Developers prototyping x402 payment flows on Base
- —Low-volume, pay-as-you-go NFT data queries
Not for
- —Bulk or batch NFT ownership queries across large collections (no batch endpoint documented)
- —Users who need detailed NFT metadata beyond ownership
- —Applications requiring free or subscription-based access
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/43/owner \
-H "X-PAYMENT: <x402_payment_proof>" \
-H "Content-Type: application/json"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/response schema, no example payloads, and the ancillary pages (/api, /pricing, /README) are empty. The specific purpose ('Premium API Access' for NFT #43 owner) is narrow and only lightly described.
Warnings
- —No OpenAPI or schema documentation available — response format is unknown
- —Ancillary pages (/api, /pricing, /README) return only a 'Connect wallet' stub with no content
- —The endpoint is scoped to a single NFT (ID 43); unclear if other NFT IDs are supported at different paths
- —No example request or response payloads are provided by the source
Citations
- —Endpoint returns 402 with x402 version 1 challenge, accepting USDC on Base network with maxAmountRequired of 20000 base unitshttps://lowpaymentfee.com/api/v1/nfts/43/owner
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/nfts/43/owner
- —Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —Ancillary pages /api, /pricing, /README show only 'Connect wallet' with no documentationhttps://lowpaymentfee.com/api