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/73/metadata

What it does

This endpoint at lowpaymentfee.com serves NFT metadata for token ID 73 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, lowpaymentfee.com, hosts a broader suite of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 data (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints share the same $0.02/request pricing model and settle on the Base L2 network using USDC. The platform advertises no rate limits, no minimums, and instant access.

This specific endpoint (/api/v1/nfts/73/metadata) returns metadata for a particular NFT. The exact schema of the returned metadata is not documented — there is no OpenAPI spec, no example responses, and the crawled docs pages beyond the landing page only show a "Connect wallet" prompt. The endpoint is confirmed live via a 402 challenge captured during probing.

Capabilities

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

Use cases

  • —Fetching metadata for NFT token #73 programmatically
  • —Integrating NFT display data into wallets or marketplaces
  • —Agent-driven NFT metadata retrieval without API key management

Fit

Best for

  • —Developers needing keyless, pay-per-call NFT metadata access
  • —AI agents that can settle micropayments via x402 on Base
  • —Quick one-off metadata lookups without account setup

Not for

  • —Bulk retrieval of metadata across many NFT collections (only token 73 at this path)
  • —Users who need detailed API documentation or response schema guarantees
  • —Applications requiring free or subscription-based access

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/nfts/73/metadata \
  -H "X-PAYMENT: <x402_payment_proof>" \
  -H "Content-Type: application/json"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/nfts/73/metadata
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, no example payloads, and the docs pages are empty beyond the landing page. The specific NFT metadata content is entirely unknown.

Warnings

  • —No OpenAPI or schema documentation available for this endpoint
  • —Response format and fields are completely undocumented
  • —Only serves metadata for NFT token ID 73 at this specific path; generality is unclear
  • —Docs, pricing, and README pages return only a 'Connect wallet' prompt with no useful content

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-22 00:34:20Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/72PegA
NFT metadata endpoint on Base, pay-per-call via x402 with USDC at $0.02/request. — Clawmart · Clawmart