NFT metadata endpoint on Base, pay-per-call via x402 with USDC at $0.02/request.
What it does
This endpoint at lowpaymentfee.com serves NFT metadata for token ID 7 via a POST request, gated by the x402 payment protocol. Each call costs $0.02 in USDC on the Base network (maxAmountRequired of 20,000 base units with 6 decimals = $0.02). No API keys or accounts are needed — callers attach an X-PAYMENT header with a valid x402 payment proof and receive JSON metadata in return.
The provider hosts a broader suite of pay-per-call APIs across data analytics, AI/ML inference (sentiment, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation), all uniformly priced at $0.02 per request. This specific endpoint focuses on NFT metadata retrieval. The x402 challenge confirms the endpoint is live, accepts USDC on Base (contract 0x8335…2913), and pays out to 0x1A2B…85F3 with a 300-second payment timeout.
Because there is no OpenAPI schema, no request/response body documentation, and no example payloads beyond the x402 challenge itself, the exact structure of the NFT metadata response and any required POST body fields are unknown. Callers should expect a JSON response (mimeType: application/json) but will need to experiment or contact the provider for field-level details.
Capabilities
Use cases
- —Retrieving on-chain NFT metadata for display in wallets or marketplaces
- —Programmatic access to NFT attributes for indexing or analytics
- —Agent-driven NFT data fetching without pre-registration or API keys
Fit
Best for
- —Developers needing quick, keyless NFT metadata lookups
- —AI agents that can settle micropayments via x402 on Base
- —Projects wanting pay-as-you-go access without subscriptions
Not for
- —Bulk metadata retrieval across thousands of NFTs (no batch endpoint documented)
- —Users who need metadata for token IDs other than 7 (only ID 7 is confirmed at this URL)
- —Anyone requiring detailed schema documentation before integration
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/7/metadata \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documented request body, no example response, and no details about what metadata fields are returned. The endpoint is confirmed live via 402 but actual functionality is opaque.
Warnings
- —No OpenAPI or request/response schema available — POST body requirements are unknown
- —Only token ID 7 is confirmed; unclear if other IDs are supported at different paths
- —No documentation pages rendered useful content (pricing, README, and /api pages only show 'Connect wallet')
- —The provider lists many API categories but none have documented schemas
Citations
- —Endpoint returns 402 with x402 challenge, confirming it is livehttps://lowpaymentfee.com/api/v1/nfts/7/metadata
- —maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02https://lowpaymentfee.com/api/v1/nfts/7/metadata
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/nfts/7/metadata
- —Provider advertises uniform $0.02/request pricing with no API keys, no rate limitshttps://lowpaymentfee.com
- —Provider lists APIs across data analytics, AI/ML, finance/Web3, and infrastructure categorieshttps://lowpaymentfee.com