x402basequality 0.35

x402-gated API key endpoint on Base, paying $0.02 in USDC per request.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/apikeys/81

What it does

This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a variety of pay-per-call APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request settled in USDC on the Base network.

The specific endpoint `/api/v1/apikeys/81` appears to be an API-key provisioning or access endpoint. The x402 challenge confirms it is live, accepting POST requests, and requires an exact payment of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals → $0.02) to the payee address 0x1A2B…85F3. The response MIME type is application/json. No OpenAPI schema, detailed documentation, or example responses were found in the crawl — the docs, pricing, API, and README pages all returned only a "Connect wallet" prompt with no substantive content.

The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02/request price point with no API keys, no rate limits, and instant access. However, no documentation describing request/response schemas for any of these endpoints was available.

Capabilities

x402-paymentusdc-basepay-per-requestapi-key-provisioningjson-response

Use cases

  • —Programmatically obtaining API keys or access tokens via a single micropayment
  • —Agents purchasing on-demand API access without pre-registration
  • —Integrating pay-per-use API access into automated workflows

Fit

Best for

  • —Agents or developers wanting zero-signup, pay-per-call API access
  • —Micropayment-based API consumption on Base L2
  • —Scenarios where no API key management or rate-limit negotiation is desired

Not for

  • —Users who need detailed API documentation or OpenAPI specs before integrating
  • —High-volume consumers who need bulk pricing or subscription plans
  • —Anyone unable to settle payments in USDC on the Base network

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/apikeys/81 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-header>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/apikeys/81
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The x402 challenge is live and confirms pricing and payment details, but there is no OpenAPI schema, no documentation, no example requests or responses, and the docs/pricing/API pages are all empty beyond a wallet-connect prompt. The purpose of this specific endpoint (apikeys/81) is unclear — it could provision an API key or grant access, but this is inferred from the name alone.

Warnings

  • —No OpenAPI or schema documentation available for any endpoint on this platform
  • —Docs, pricing, API, and README pages all return only a 'Connect wallet' prompt with no substantive content
  • —The exact purpose and response format of /api/v1/apikeys/81 is unclear — 'Premium API Access' is the only description
  • —Cannot verify what the broader advertised endpoints (AI, finance, utils) actually return

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 15:23:14Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/meGZRK
x402-gated API key endpoint on Base, paying $0.02 in USDC per request. — Clawmart · Clawmart