NFT metadata endpoint on Base, pay-per-call via x402 with USDC at $0.02/request.
What it does
This endpoint serves NFT metadata for token ID 42 via a pay-per-request x402 protocol on the Base network. The payment is settled in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a maximum cost of $0.02 per call (20,000 base units at 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The endpoint is part of a broader suite of APIs hosted at lowpaymentfee.com, which spans data & analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all priced uniformly at $0.02 per request. The specific endpoint probed (/api/v1/nfts/42/metadata) accepts POST requests and returns application/json. However, no OpenAPI schema, request body schema, or example response was found in the crawl, so the exact fields returned in the NFT metadata payload are unknown.
The x402 challenge was successfully captured (HTTP 402 with x402Version 1), confirming the endpoint is live. The root landing page also returned HTTP 200. Documentation beyond the landing page listing is effectively absent — the /api, /pricing, and /README pages all resolve to a "Connect wallet" prompt with no further content.
Capabilities
Use cases
- —Retrieve metadata for NFT token #42 programmatically
- —Integrate NFT metadata lookups into agent workflows without API key management
- —Pay-per-call NFT data access settled on Base L2 in USDC
Fit
Best for
- —Agents or bots that need on-demand NFT metadata without subscription overhead
- —Developers experimenting with x402 payment protocol integrations
- —Low-volume, pay-as-you-go NFT data consumers
Not for
- —Bulk NFT metadata retrieval across many token IDs (only token 42 is exposed at this path)
- —Users who need detailed documentation or response schema guarantees before integrating
- —Non-crypto users who cannot generate x402 payment proofs on Base
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/42/metadata \
-H "X-PAYMENT: <x402-payment-proof>" \
-H "Content-Type: application/json"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and no example payloads. The specific NFT metadata content is entirely unknown.
Warnings
- —No OpenAPI or request/response schema available — callers must discover the payload format experimentally.
- —Documentation pages (/api, /pricing, /README) all resolve to a 'Connect wallet' prompt with no useful content.
- —Only token ID 42 is exposed at this specific path; it is unclear whether other token IDs are supported via different paths.
- —The provider description 'Premium API Access' is generic and does not describe the actual endpoint functionality.
Citations
- —The endpoint returns HTTP 402 with x402Version 1, confirming it is live and uses the x402 protocol.https://lowpaymentfee.com/api/v1/nfts/42/metadata
- —Payment is in USDC on Base network with maxAmountRequired of 20000 base units ($0.02).https://lowpaymentfee.com/api/v1/nfts/42/metadata
- —All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access.https://lowpaymentfee.com
- —The USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.https://lowpaymentfee.com/api/v1/nfts/42/metadata