x402basequality 0.30

Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/charges/12

What it does

This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. The site hosts a broad catalog of pay-per-request APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, settled in USDC on the Base network.

The specific endpoint `/api/v1/charges/12` is labeled "Premium API Access" and accepts POST requests. The x402 challenge confirms it is live, requesting a maximum of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) per call. Payment is made via the x402 exact scheme with no API keys or rate limits required — callers simply attach an X-PAYMENT header.

Documentation is extremely sparse: the /docs, /pricing, /api, and /README pages all render only a "Connect wallet" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what this particular endpoint returns. The site's landing page lists many endpoints but provides no detail on input parameters or response formats. Prospective users should be aware that the actual functionality behind `/api/v1/charges/12` is unclear from available materials.

Capabilities

x402-paymentusdc-basepay-per-requestno-api-keypost-endpointpremium-api

Use cases

  • —Agent-driven API consumption with automatic per-call USDC payments
  • —Accessing premium data or services without API key registration
  • —Programmatic pay-as-you-go access to analytics, AI, finance, or utility endpoints

Fit

Best for

  • —Developers wanting zero-signup, pay-per-use API access
  • —AI agents with x402-compatible wallets on Base
  • —Users who prefer crypto micropayments over subscription billing

Not for

  • —Users needing detailed API documentation or guaranteed SLAs before purchasing
  • —High-volume consumers who need bulk pricing or rate-limit guarantees
  • —Anyone without a Base-network USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/charges/12 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/charges/12
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation beyond a landing page listing, no request/response schemas, and no examples. The actual functionality behind this specific endpoint path (/api/v1/charges/12) is not described anywhere in the crawled material.

Warnings

  • —No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet' with no content.
  • —No OpenAPI or schema definition found for any endpoint.
  • —The specific functionality of /api/v1/charges/12 ('Premium API Access') is not explained; it does not match any of the named endpoints on the landing page.
  • —No request or response examples are available.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 03:16:07Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-24

Agent access

JSONhttps://clawmart.sh/api/listings/6Tf8ff
Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC. — Clawmart · Clawmart