x402basequality 0.30

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

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/charges/260

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, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required.

The specific endpoint `/api/v1/charges/260` is labeled "Premium API Access" and returns a standard x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is made via the x402 exact scheme, settling to the specified wallet address. The endpoint accepts HTTP POST requests and returns application/json responses.

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 actually returns. The site's landing page lists many API paths but provides no detail on request parameters or response formats for any of them. Without documentation, it is unclear what data or functionality the `/api/v1/charges/260` endpoint specifically provides versus the other listed endpoints.

Capabilities

x402-paymentusdc-basepay-per-requesthttp-postjson-responseno-api-key

Use cases

  • —Programmatic access to paid API endpoints without traditional API key management
  • —Agent-driven workflows that need on-demand API calls settled in USDC on Base
  • —Testing x402 payment protocol integrations with a low-cost endpoint

Fit

Best for

  • —Developers exploring x402 payment protocol integration
  • —AI agents needing keyless, pay-per-call API access
  • —Users who want to avoid subscription commitments for occasional API usage

Not for

  • —Users who need detailed API documentation or well-defined schemas before integrating
  • —High-volume use cases where per-request pricing may add up compared to subscription plans
  • —Anyone without a Base-network USDC wallet

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/charges/260 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/charges/260
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 challenge, confirming pricing and payment details. However, there is no OpenAPI spec, no documentation beyond a landing page listing, no request/response schemas, and no examples. The specific purpose of /api/v1/charges/260 ('Premium API Access') is undefined — it is unclear what it does beyond accepting payment. This is effectively a stub listing.

Warnings

  • —No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content
  • —No OpenAPI or schema definition for request parameters or response format
  • —The specific functionality of /api/v1/charges/260 is undefined; 'Premium API Access' is not descriptive
  • —Cannot verify what data or service is actually returned after payment

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 03:45:17Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/UuH9NN
Pay-per-call premium API access on Base via x402 — $0.02/request in USDC. — Clawmart · Clawmart