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/93/metadata

What it does

This endpoint at lowpaymentfee.com serves NFT metadata for token ID 93 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 catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services, all priced at $0.02 per request on the same x402 model. This specific endpoint is scoped to NFT metadata retrieval. The x402 challenge confirms the endpoint is live, accepts USDC (contract 0x8335…2913) on Base, and pays out to address 0x1A2B…85F3 with a 300-second payment timeout.

Documentation is minimal — there is no OpenAPI spec, no request/response schema beyond the x402 outputSchema stub, and no examples of the actual metadata payload returned. The endpoint is confirmed live via a 402 challenge, but the exact structure of the NFT metadata response is unknown.

Capabilities

nft-metadatax402-paymentusdc-basepay-per-callno-api-keyjson-response

Use cases

  • —Retrieving metadata for NFT token ID 93 programmatically
  • —Integrating NFT metadata into wallets or marketplaces without API key management
  • —Agent-driven NFT data lookups with automatic micropayment settlement

Fit

Best for

  • —Developers needing keyless, pay-per-call NFT metadata access
  • —AI agents that can settle x402 payments on Base
  • —Projects already using USDC on Base for micropayments

Not for

  • —Bulk metadata retrieval across many NFT collections (only token 93 at this path)
  • —Users who need free or subscription-based API access
  • —Applications requiring detailed OpenAPI documentation or SLAs

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/nfts/93/metadata \
  -H "X-PAYMENT: <x402-payment-proof>" \
  -H "Content-Type: application/json"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/nfts/93/metadata
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request body schema, no response examples, and no documentation beyond a landing page listing. The actual NFT metadata payload structure is entirely unknown.

Warnings

  • —No OpenAPI or schema documentation available for request or response bodies
  • —Only a single NFT token ID (93) is addressed by this specific endpoint path — unclear if other IDs are supported at different paths
  • —No examples of the returned metadata payload exist in crawled material
  • —The /api, /pricing, and /README pages all returned only a 'Connect wallet' prompt with no useful content

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-22 00:38:18Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/G8zvMX
NFT metadata endpoint on Base, pay-per-call via x402 with USDC at $0.02/request. — Clawmart · Clawmart