TariffMonkee

x402 · HTTP 402 · USDC

APIs your agent can pay for. No account. No API key.

TariffMonkee is a catalog of small, single-purpose web tools priced per call. An agent hits an endpoint, gets a 402 with the exact price, pays in USDC over the x402 protocol, and gets its answer. No sign-up flow, no credit packs, no keys to provision or leak.

Browse the catalog Read the docs (JSON)
34live endpoints
$0.001cheapest call
0accounts required
24hresponse caching

How it works

Four steps, no humans in the loop

Call the endpoint

Your agent requests any tool under /paid. Full parameter docs live at /docs and /llms.txt.

Get the price

The response is HTTP 402 with a PAYMENT-REQUIRED header stating the exact amount, asset, and accepted networks.

Pay in USDC

Any x402 v2 client signs and settles the payment. Settlement runs through the Coinbase CDP facilitator on Base and Solana.

Get the result

Retry with the PAYMENT header and receive a 200 with your data. Repeat calls within 24 hours hit cache.

Why this model

Built the opposite way around

No sign-up wall

Most agent tool platforms make you register, generate an API key, and pre-buy credits before the first call. Here the first call is the sign-up: the 402 response is the whole onboarding.

Pay for exactly what runs

Per-call pricing from $0.001. No minimums, no expiring credit balances, no subscription you forget to cancel.

Priced for machines

Every endpoint states one flat price up front, machine-readable, so an agent can budget a task before spending a cent.

Catalog

Tools agents actually use

GET/paid/content$0.005

Fetch a URL with a real rendered browser (JavaScript executed) and return clean Markdown.

Details
GET/paid/linkcheck$0.005

URL -> safety verdict.

Details
GET/paid/gbp-audit$0.05

Business -> visibility score, missing fields, review health, AI-readiness flags, fix list.

Details
GET/paid/tw-reference$0.012

Taiwan government reference data: ARC/visa rules and all 15 WDA work-permit categories, translated to English and structured into labelled sections.

Details
GET/paid/verify-citation$0.025

Claim + cited source -> supported / contradicted / not_addressed, with the exact verbatim passage from the source as evidence.

Details
GET/paid/work-permit-check$0.05

Taiwan work permit eligibility GUIDANCE, not a determination, for a foreign-professional profile.

Details

See all 34 endpoints

Try it yourself

See the real 402, right now

No wallet needed for this part -- this is the actual, unpaid response, not a mockup.

curl -i "https://tariffmonkee.com/paid/content?url=https://example.com"

Ready to actually pay for a call? See how to pay →

Compatible with

x402 v2Coinbase CDPBaseSolanaUSDCBazaar discovery

Verified by

TariffMonkee listed on x402-list

Recent

Changelog

  • Trust cluster (linkcheck, sitegrade, domain-intel, email-verify, trust-audit) and Local Business cluster (gbp-audit, serp-check, ai-visibility) join the catalog. 18 endpoints total.
  • Content cluster complete: all ten endpoints live with real settled payments. /research ships: multi-source bundles with a Traditional Chinese / Taiwan search lane.
  • /content, /fetch-clean, /screenshot and /pdf live on Base mainnet. /extract-url added to the catalog.
  • Foundation deployed to production. First real x402 payment settled and indexed for Bazaar discovery.

Who it's for

Three ways in

  • Autonomous agents: if you are one, start at /docs. Every endpoint documents its price, parameters, and output shape.
  • Agent developers: drop pay-per-call web data into any x402-capable stack without provisioning keys per user.
  • Builders exploring agentic payments: a working, production x402 deployment to test clients against, from $0.001 a call.
Portrait of Jeff Anderson, founder of TariffMonkee

Who runs this

A named, credentialed founder

TariffMonkee is built and operated by Jeff Anderson, a cybersecurity and systems integration professional (CISSP, CISM, PMP). No anonymous team page, no stock photos.

About the founder