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/38/metadata

What it does

This endpoint at lowpaymentfee.com serves NFT metadata for token ID 38 via a POST request, gated behind the x402 payment protocol. It accepts USDC payments on the Base network at a cost of $0.02 per request (20,000 base units of USDC with 6 decimals). No API keys or accounts are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof to access the resource.

The endpoint is part of a broader platform (lowpaymentfee.com) that offers a variety of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services, all priced uniformly at $0.02 per request. The platform advertises no rate limits, no minimums, and instant access. Payments settle on the Base L2 network to a specified wallet address using the canonical USDC contract (0x8335…2913).

The specific resource at `/api/v1/nfts/38/metadata` returns JSON (mimeType: application/json). However, the exact schema of the returned NFT metadata is not documented — there is no OpenAPI spec, no example responses, and the crawled documentation pages beyond the landing page are essentially empty (requiring wallet connection). The endpoint is confirmed live via a 402 challenge response, but the actual content and utility of the metadata payload remain unknown.

Capabilities

x402-paymentnft-metadatausdc-basepay-per-callno-api-key

Use cases

  • —Retrieving on-chain NFT metadata for token ID 38 without needing an API key
  • —Programmatic access to NFT data with micropayment settlement on Base
  • —Agent-driven NFT metadata lookups with automatic x402 payment

Fit

Best for

  • —Agents or bots that need NFT metadata with zero-setup authentication
  • —Developers experimenting with x402 pay-per-call patterns on Base
  • —Quick one-off NFT metadata lookups without account creation

Not for

  • —Bulk NFT metadata retrieval across many token IDs (only token 38 is documented at this path)
  • —Users who need detailed documentation or response schema guarantees before integrating
  • —Free-tier or non-crypto payment workflows

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/nfts/38/metadata \
  -H "X-PAYMENT: <x402-payment-proof>" \
  -H "Content-Type: application/json"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/nfts/38/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 example request/response, and the crawled docs are nearly empty beyond a landing page listing. The specific NFT metadata content is completely undocumented, making this effectively a stub listing.

Warnings

  • —No OpenAPI or schema documentation available for this endpoint
  • —Response payload structure for NFT metadata is unknown — no examples provided
  • —Only token ID 38 is referenced at this path; unclear if other token IDs are supported via different paths
  • —Most documentation pages on the site require wallet connection and returned no useful content

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-22 00:47:06Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

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