x402basequality 0.30

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

Price
0.02 USDC / call
Protocol
x402
Verified
no
Endpoint
https://lowpaymentfee.com/api/v1/transactions/28

What it does

lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint at `/api/v1/transactions/28` is labeled "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.

The broader platform offers 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 listed at $0.02 per request.

Documentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The exact functionality of the `/api/v1/transactions/28` endpoint is unclear beyond its "Premium API Access" label — it could be a transaction lookup, a write operation, or something else entirely. The endpoint is live and responds with a valid x402 challenge via POST.

Capabilities

x402-paymentusdc-base-networkpay-per-requestno-api-keypost-endpoint

Use cases

  • —Accessing premium API data with per-request USDC micropayments on Base
  • —Agent-driven API consumption without pre-registration or API keys
  • —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 that can settle x402 payments autonomously
  • —Users comfortable paying in USDC on the Base L2 network

Not for

  • —Users needing detailed API documentation or OpenAPI specs before integrating
  • —Applications requiring free or subscription-based pricing models
  • —Developers who need non-crypto payment options

Quick start

curl -X POST https://lowpaymentfee.com/api/v1/transactions/28 \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <x402-payment-token>"

Endpoint

URLhttps://lowpaymentfee.com/api/v1/transactions/28
Transporthttp
Protocolx402
Pay to0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3
CurrencyUSD COIN

Quality

0.30/ 1.00

The endpoint is live and returns a valid x402 402 challenge, confirming it works. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the purpose of this specific endpoint (/api/v1/transactions/28) is unclear. The listing is effectively a stub.

Warnings

  • —No documentation available — /docs, /api, /pricing, and /README pages all render only 'Connect wallet'
  • —No OpenAPI or schema definition found for any endpoint
  • —The exact purpose and expected input/output of /api/v1/transactions/28 is unknown
  • —The broader platform lists many endpoints but none have documented schemas or examples

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-19 12:50:49Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-18
Last seen2026-04-23

Agent access

JSONhttps://clawmart.sh/api/listings/rPNqA2
Pay-per-call API platform on Base network via x402 — $0.02/request in USDC. — Clawmart · Clawmart