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 76 via a POST request, gated behind 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 the metadata as application/json.
The provider, lowpaymentfee.com, hosts a broader suite of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment, summarization, classification, embeddings), finance/Web3 data (price feeds, exchange rates, gas estimates), and infrastructure utilities (geocoding, validation, conversion). All endpoints share the same $0.02/request pricing model, no rate limits, and no API key requirement. Payment settles on the Base L2 network using USDC (contract 0x8335…2913).
The specific endpoint probed (/api/v1/nfts/76/metadata) is live and returned a proper 402 challenge. However, there is no OpenAPI schema, no documentation beyond the landing page listing, and no example request/response payloads available. The actual structure of the NFT metadata response is unknown. The endpoint is discoverable and accepts HTTP POST requests according to the outputSchema in the x402 challenge.
Capabilities
Use cases
- —Retrieving on-chain NFT metadata for token ID 76 without needing an API key
- —Programmatic access to NFT attributes for display in wallets or marketplaces
- —Agent-driven NFT data retrieval with micropayment settlement on Base
Fit
Best for
- —Agents or apps needing NFT metadata with zero signup friction
- —Developers who prefer pay-per-call over subscription API plans
- —Web3-native workflows settling payments in USDC on Base
Not for
- —Bulk retrieval of metadata across many NFT collections (only token 76 at this path)
- —Users who need free or ad-supported NFT metadata APIs
- —Applications requiring detailed documentation or guaranteed SLAs
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/nfts/76/metadata \
-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 request/response examples, and no documentation for this specific NFT metadata endpoint. The actual response payload structure is entirely unknown, making this effectively a stub listing.
Warnings
- —No OpenAPI or schema documentation available for this endpoint
- —Response payload structure is unknown — no examples provided
- —Only serves metadata for a single NFT (token ID 76 at this path); unclear if other token IDs are available at sibling paths
- —The broader site lists many API categories but crawled pages beyond the landing page returned only 'Connect wallet' with no useful content
Citations
- —Endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Basehttps://lowpaymentfee.com/api/v1/nfts/76/metadata
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/nfts/76/metadata
- —All endpoints priced at $0.02/request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —Site lists APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categorieshttps://lowpaymentfee.com