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 #77 via a pay-per-call x402 protocol. The payment is settled in USDC on the Base network. The x402 challenge advertises a maxAmountRequired of 20,000 base units; since USDC uses 6 decimals, this 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 endpoint accepts POST requests and returns JSON. It is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-call APIs across categories including data analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all priced at $0.02 per request on the Base network. However, this specific endpoint is scoped to NFT owner lookups.
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 402 with a well-formed x402 challenge). The NFT ID (77) is embedded in the URL path, suggesting other NFT IDs may be queryable at parallel paths, but this is not confirmed.
Capabilities
Use cases
- —Looking up the current owner of a specific NFT programmatically
- —Verifying NFT ownership before executing a downstream transaction
- —Building dashboards or bots that track NFT holder changes
Fit
Best for
- —Agents needing on-demand NFT ownership data without API key management
- —Micropayment-friendly workflows on the Base network
- —Quick one-off NFT owner checks at very low cost
Not for
- —Bulk enumeration of all NFT owners in a collection (one ID per URL path)
- —Historical ownership or transfer event queries
- —Users who cannot settle USDC payments on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/77/owner \
-H "X-PAYMENT: <x402_payment_proof>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is confirmed live with a valid x402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documented request body schema, no example responses, and no detailed documentation for this specific NFT endpoint. The listing is largely inferred from the URL structure and the x402 challenge metadata.
Warnings
- —No OpenAPI or schema documentation available for request or response payloads.
- —The specific data returned by this NFT owner endpoint is unknown — no example response was captured.
- —The broader platform lists many endpoints but individual endpoint docs are absent.
- —NFT ID 77 is hardcoded in the path; it is unclear whether other IDs are supported or what collection is referenced.
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base network.https://lowpaymentfee.com/api/v1/nfts/77/owner
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.https://lowpaymentfee.com/api/v1/nfts/77/owner
- —The platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base network.https://lowpaymentfee.com