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/66/metadata

What it does

This endpoint serves NFT metadata for token ID 66 via a pay-per-request x402 protocol on the Base network. The caller sends a POST request with an X-PAYMENT header containing a USDC payment proof, and receives JSON metadata in return. The endpoint is part of a broader platform at lowpaymentfee.com that offers dozens of APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per request with no API keys, no rate limits, and no commitments.

The x402 challenge confirms the endpoint is live and accepts exact-scheme payments in USDC (contract 0x8335…2913 on Base) with a max amount of 20,000 base units, which equals $0.02 given USDC's 6 decimals. Payments are sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The response MIME type is application/json.

Note that the specific NFT metadata content returned by this endpoint is not documented — there is no OpenAPI schema, no example response, and no further documentation beyond the landing page listing. The endpoint appears to be one item in a large catalog of similarly priced endpoints, but the actual data behind token 66's metadata is unknown.

Capabilities

nft-metadatax402-paymentusdc-basepay-per-requestjson-response

Use cases

  • —Retrieving metadata for a specific NFT (token 66) programmatically
  • —Integrating NFT display data into a dApp or marketplace frontend
  • —Agent-driven NFT data retrieval with automatic micropayment

Fit

Best for

  • —Developers needing on-demand NFT metadata without API key management
  • —AI agents that can settle x402 payments autonomously on Base
  • —Applications requiring low-cost, no-commitment NFT data access

Not for

  • —Bulk retrieval of metadata across many NFT collections (only token 66 is served at this path)
  • —Users who need free or subscription-based access rather than per-call crypto payments
  • —Production use cases requiring documented response schemas and SLAs

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/nfts/66/metadata \
  -H "X-PAYMENT: <x402-payment-proof>" \
  -H "Content-Type: application/json"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/nfts/66/metadata
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no example request/response, and no documentation about what metadata is actually returned. The listing is essentially a stub with a working payment gate.

Warnings

  • —No OpenAPI or schema documentation available for this endpoint
  • —No example response or field definitions for the NFT metadata payload
  • —The broader platform lists many endpoints but none have detailed docs beyond a title and price
  • —Unknown what NFT collection or data source backs token ID 66

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 23:46:59Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/Jx8Lsb
NFT metadata endpoint on Base, pay-per-call via x402 with USDC at $0.02/request. — Clawmart · Clawmart