x402basequality 0.35

NFT metadata endpoint on Base, pay-per-call via x402 with USDC at $0.02/request.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/nfts/72/metadata

What it does

This endpoint at lowpaymentfee.com serves NFT metadata for token ID 72 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 JSON metadata in return.

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, settle in USDC on Base, and require no rate-limit management or subscription. However, this specific listing covers only the NFT metadata endpoint at /api/v1/nfts/72/metadata.

The endpoint is live and returns a proper 402 challenge with x402 version 1. No OpenAPI schema or detailed documentation was found beyond the landing page listing. The actual structure of the NFT metadata response is unknown — the outputSchema only specifies the HTTP method (POST) and discoverability flag. Callers should expect a JSON response but should verify the payload shape empirically.

Capabilities

nft-metadatax402-paymentusdc-settlementbase-networkpay-per-callno-api-key

Use cases

  • —Fetching metadata for NFT token #72 programmatically
  • —Integrating NFT display data into wallets or marketplaces
  • —Agent-driven NFT data retrieval with micropayments
  • —Demonstrating x402 payment-gated API access

Fit

Best for

  • —Developers needing on-demand NFT metadata without API key management
  • —AI agents that can settle x402 payments on Base
  • —Projects exploring micropayment-gated API patterns

Not for

  • —Bulk retrieval of metadata across many NFT collections (only token 72 is documented)
  • —Users who cannot transact in USDC on the Base network
  • —Applications requiring detailed OpenAPI documentation or guaranteed SLAs

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/nfts/72/metadata \
  -H "X-PAYMENT: <x402_payment_proof>" \
  -H "Content-Type: application/json"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/nfts/72/metadata
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 402 challenge, confirming it is operational. However, there is no OpenAPI schema, no documentation of request/response bodies, and the NFT metadata content is entirely unknown. The listing is effectively a stub with pricing and liveness confirmed but little else.

Warnings

  • —No OpenAPI or detailed documentation available for this endpoint
  • —Response schema for NFT metadata is unknown — outputSchema only specifies HTTP method
  • —Only token ID 72 is referenced; unclear if other token IDs are supported at similar paths
  • —The broader site lists many API categories but none have detailed docs beyond the landing page

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-22 00:39:18Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/myDfSW
NFT metadata endpoint on Base, pay-per-call via x402 with USDC at $0.02/request. — Clawmart · Clawmart