hello-world-x402.vercel.app

3 resources1012ms p50

hello-world-x402.vercel.app

AI-authored, unreviewedclaude-sonnet-4-6

This host serves developers and agents who need to validate x402 micropayment integration on Base mainnet using USDC. It provides three minimal endpoints: a plain-text hello-world response, a static JSON greeting with timestamp, and a payload echo that returns submitted JSON verbatim with a server timestamp. None of the endpoints perform computation or serve dynamic data; their sole purpose is payment-flow verification and round-trip testing.

Capabilities

Static Response Payment Testing

Endpoints that return fixed, non-personalized content after a USDC micropayment, useful for confirming that the x402 payment gate on Base accepts payment and returns a successful response.

fetch-hello-worldfetch-personalized-greeting

Payload Echo and Integrity Verification

Accepts a caller-supplied JSON body and returns it verbatim alongside a server timestamp, enabling agents to verify round-trip payload integrity through a paywalled endpoint.

echo-payload-verbatim

Workflows

Progressive x402 Integration Smoke Test

Use when an agent needs to validate the full x402 payment stack on Base in increasing complexity — from a bare response, to a structured JSON response, to a round-trip payload echo — before integrating with a production paywalled API.

1
fetch-hello-worldConfirm the simplest possible x402 payment succeeds and returns a non-error response on Base.
2
fetch-personalized-greetingConfirm a JSON-structured paywalled response is returned correctly with timestamp and version fields after payment.
3
echo-payload-verbatimSubmit a known JSON payload and verify it is returned byte-for-byte with a server timestamp, confirming full round-trip payload integrity through the payment gate.

Use this host in Claude

Copy the skill below, then add it on claude.ai under Skills → Create skill → Upload.

Machine-readable: skills.json · SKILL.md · manifest.json

$0.00

across0settlements·$0.00avg

0buyers

0sellers

All-time context: $0.12 across 119 settlements

Resources (3)

All-time breakdown

Resource	Category	Quality	Tier	Txns	Volume
EchoPay https://hello-world-x402.vercel.app/echo	Tools	96	host level	—	—
TipGreet https://hello-world-x402.vercel.app/greet	Social	72	host level	—	—

Own hello-world-x402.vercel.app? List it with your agent

Paste the prompt below to your coding agent. It runs a real paid test on every route, fixes what scores low, and re-auditions until they pass — the gaps below are already filled in for you.

1 route is in the 50–74 band — working, but with room to climb.

Paste this to your agent

Make my x402 API at https://hello-world-x402.vercel.app discoverable on x402gle. Read the instructions at https://x402gle.com/agent.md and follow them end to end. Install the OpenDexter CLI, then run `npx @dexterai/opendexter audition https://hello-world-x402.vercel.app --json`. Read the score and fixInstructions for every route, fix my OpenAPI and endpoints until each route passes, and re-audition until it does. A passing audition lists my API automatically.

New to this? How agent-first onboarding works.

Latest Settlements

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hello-world-x402.vercel.app