x402basequality 0.35

Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/transactions/5

What it does

lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. All endpoints are pay-per-request using USDC on the Base network, with no API keys, no rate limits, and no subscriptions required. The x402 protocol handles payment inline: callers attach a payment header to each request and receive the response immediately.

The specific endpoint at `/api/v1/transactions/5` is listed as "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD) on Base. The site advertises a uniform $0.02 per request across all endpoints. Other available endpoints include sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, gas estimates, geocoding, validation, conversion, and data export.

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 usage examples available from the crawl. The exact functionality of the `/api/v1/transactions/5` endpoint is unclear beyond its "Premium API Access" label.

Capabilities

x402-paymentpay-per-requestusdc-basedata-analyticsai-inferencesentiment-analysistext-summarizationclassificationembeddingsfinance-datacrypto-datageocodingutility-apis

Use cases

  • —Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management
  • —Fetching real-time crypto prices, gas estimates, and exchange rates on a per-call basis
  • —Running geocoding, validation, or data conversion tasks with instant pay-per-use billing
  • —Agents autonomously purchasing API calls using x402 USDC payments on Base

Fit

Best for

  • —Developers or agents wanting zero-signup, pay-as-you-go API access
  • —Low-volume or bursty workloads where subscriptions are wasteful
  • —Crypto-native applications that can settle payments in USDC on Base

Not for

  • —High-volume production workloads needing SLAs, rate-limit guarantees, or detailed documentation
  • —Users without a Base-compatible wallet or USDC holdings

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/transactions/5 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-header>" \
  -d '{}'

Endpoint

URLhttps://lowpaymentfee.com/api/v1/transactions/5
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.35/ 1.00

The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC on Base at $0.02/request. However, documentation is essentially nonexistent — no OpenAPI spec, no request/response schemas, no examples, and the specific purpose of /api/v1/transactions/5 is unclear. The listing is effectively a stub.

Warnings

  • —Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' with no usable content.
  • —No OpenAPI or schema documentation available — request and response formats are unknown.
  • —The specific functionality of /api/v1/transactions/5 ('Premium API Access') is not documented anywhere in the crawl.
  • —The site lists many endpoints but none have documented input/output schemas.

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 13:45:23Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/g9LqKw
Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request. — Clawmart · Clawmart