Query NFT ownership data via x402 micropayment on Base for $0.02 per request.
What it does
This endpoint at lowpaymentfee.com returns NFT ownership information for a specific NFT (token ID 99) via a pay-per-call x402 protocol. The endpoint accepts POST requests and is settled in USDC on the Base network. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 per request. 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 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 are listed at $0.02 per request on the same x402 payment model using USDC on Base. This specific endpoint (/api/v1/nfts/99/owner) is part of the Web3/NFT category, though it is not explicitly listed on the provider's landing page among the featured APIs.
The endpoint is live and returns a proper 402 challenge. However, there is no OpenAPI schema, no documentation beyond the landing page, and no example request/response payloads available. The actual response format for the NFT owner query is unknown — it likely returns JSON with owner address information, but this is inferred, not documented.
Capabilities
Use cases
- —Look up the current owner of a specific NFT programmatically
- —Integrate NFT ownership verification into agent workflows without API key management
- —Pay-per-call NFT data retrieval settled on Base L2
Fit
Best for
- —Agents needing on-demand NFT ownership data without subscription commitments
- —Developers prototyping Web3 apps who want instant API access with no signup
- —Micropayment-based workflows where per-call billing is preferred
Not for
- —Bulk NFT ownership queries across many token IDs (only token 99 is addressed by this endpoint)
- —Users who need free or subscription-based NFT data APIs
- —Production systems requiring documented response schemas and SLAs
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/99/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 with clear pricing. However, there is no OpenAPI schema, no documented request/response format, no examples, and the specific NFT endpoint is not even listed on the provider's own landing page. The actual behavior of the endpoint is entirely inferred.
Warnings
- —No OpenAPI or schema documentation available for this endpoint
- —The /api/v1/nfts/99/owner path is not listed among the provider's advertised APIs on the landing page
- —Response format is unknown — no example responses are available
- —The endpoint is hardcoded to token ID 99; it is unclear if other token IDs are supported via similar paths
Citations
- —The x402 challenge advertises maxAmountRequired of 20000 base units of USDC (USD Coin) on Base networkhttps://lowpaymentfee.com/api/v1/nfts/99/owner
- —All listed APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/nfts/99/owner