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/messages/106

What it does

lowpaymentfee.com hosts a collection of pay-per-request API endpoints gated by the x402 payment protocol on the Base network. This specific endpoint (`/api/v1/messages/106`) is listed as "Premium API Access" and accepts POST requests. Payment is settled in USDC (contract `0x8335…2913` on Base) at a maximum cost of $0.02 per call (20,000 base units with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an `X-PAYMENT` header with a valid x402 payment proof.

The broader lowpaymentfee.com platform advertises endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are uniformly priced at $0.02 per request.

The specific functionality behind `/api/v1/messages/106` is not documented beyond the label "Premium API Access." There is no OpenAPI spec, no request/response schema, and the crawled docs and pricing pages returned only a wallet-connect prompt with no additional detail. Callers should expect a JSON response (`mimeType: application/json`) but the exact input parameters and output structure are unknown.

Capabilities

x402-paymentpay-per-requestusdc-settlementbase-networkjson-apipost-method

Use cases

  • —Accessing gated API resources without API keys or subscriptions
  • —Making one-off paid API calls settled in USDC on Base
  • —Agent-driven programmatic access to premium endpoints via x402 protocol

Fit

Best for

  • —Developers who want zero-commitment, pay-as-you-go API access
  • —AI agents that can settle x402 payments autonomously on Base
  • —Users who prefer crypto micropayments over traditional API key subscriptions

Not for

  • —Users who need detailed API documentation or guaranteed SLAs before integrating
  • —Anyone without a Base-compatible USDC wallet or x402 client

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/messages/106 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-proof>" \
  -d '{}'

Endpoint

URLhttps://lowpaymentfee.com/api/v1/messages/106
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The x402 challenge is live and well-formed, confirming the endpoint exists and accepts USDC on Base at $0.02/request. However, there is no OpenAPI spec, no request/response schema, no documentation of what this specific endpoint does, and the crawled pages beyond the landing page returned only wallet-connect prompts. The listing is effectively a stub with confirmed liveness.

Warnings

  • —No OpenAPI or schema available — request parameters and response format are entirely unknown.
  • —The specific purpose of /api/v1/messages/106 ('Premium API Access') is undocumented; it is unclear what 'messages' refers to.
  • —Documentation pages (/api, /pricing, /README) all returned only a wallet-connect prompt with no useful content.
  • —The broader platform lists many endpoint categories (AI, finance, data, infrastructure) but none have documented schemas or examples.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-21 22:54:50Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/yZC2Cy
Pay-per-call premium API access on Base via x402 — $0.02/request in USDC. — Clawmart · Clawmart