x402-native API storefront

Tiny paid tools for AI agents.

Schema-first microtools for safe web ingestion, source checks, page proofs, commerce policies, and product-fit decisions.

Production: Base mainnet USDC Mainnet billing: live beta MCP server OpenAPI 3.1 TypeScript SDK

Production today: free /v1/* for development; paid /x402/v1/* uses Base mainnet USDC. Paid 2xx responses are billable; 402 challenges are not charged. /status.json is the live billing source.

Browse tools Start with x402 Read docs

What makes Primitive402 different

Small tools with clear contracts.

Each call is priced, bounded, and shaped for agent workflows instead of broad account-based APIs.

Pay per call

Agents pay only when they need a tool.

Structured outputs

Every tool returns predictable JSON.

Safety-first

SSRF guardrails, risk signals, no-secret guidance.

Built for discovery

OpenAPI, llms.txt, x402 catalog, MCP.

Tool catalog

Browse the product shelf.

Seven compact APIs for agent-safe web, source, proof, and commerce workflows.

safe_fetch_url $0.01 USDC

Safe Fetch URL

Fetch clean text with SSRF checks and risk signals.

web

/v1/safe-fetch-url /x402/v1/safe-fetch-url

Docs Use case

check_prompt_injection_risk $0.005 USDC

Check Prompt Injection Risk

Score text for prompt-injection patterns.

safety

/v1/check-prompt-injection-risk /x402/v1/check-prompt-injection-risk

Docs Use case

verify_claim_against_source $0.05 USDC

Verify Claim Against Source

Check if a source supports a claim.

research

/v1/verify-claim-against-source /x402/v1/verify-claim-against-source

Docs Use case

create_page_proof $0.10 USDC

Create Page Proof

Capture page metadata, hashes, and optional artifacts.

web

/v1/create-page-proof /x402/v1/create-page-proof

Docs Use case

extract_return_policy $0.03 USDC

Extract Return Policy

Extract return and refund policy signals.

commerce

/v1/extract-return-policy /x402/v1/extract-return-policy

Docs Use case

extract_subscription_terms $0.04 USDC

Extract Subscription Terms

Extract trial, renewal, and cancellation terms.

commerce

/v1/extract-subscription-terms /x402/v1/extract-subscription-terms

Docs Use case

check_product_fit $0.05 USDC

Check Product Fit

Check if a product page fits buyer constraints.

commerce

/v1/check-product-fit /x402/v1/check-product-fit

Docs Use case

Start using Primitive402

Choose an entry point.

Docs, paid guides, and discovery files point at the same tools.

For developers

Use /v1 routes, OpenAPI, and SDK examples.

Docs OpenAPI SDK

For x402 clients

Use /x402 routes and the paid-test guide.

x402 docs Paid test

For agents

Read llms-full, catalog, and agent manifest.

llms-full Catalog Agent manifest

Payment flow

How x402 works here.

HTTP 402 challenges are not charged. Successful paid 2xx responses are billable. Production uses Base mainnet USDC.

Discover

Read catalog, OpenAPI, MCP, or docs.

Call

Send a request to the matching /x402/v1/*.

Pay

An x402-capable client pays the route price and retries.

Use JSON

Receive structured JSON for the next decision.

New to x402? Read the plain-English guide.

Tool packs

Collections for agent workflows.

AgentTrust covers safety and provenance. Commerce covers policy and product-fit checks.

Safety and provenance

AgentTrust Pack

Web ingestion, prompt-injection risk, claim checks, and page proofs.

Safe Fetch URL Check Prompt Injection Risk Verify Claim Against Source Create Page Proof

Shopping and subscriptions

Commerce Pack

Return policies, subscription terms, and product fit.

Extract Return Policy Extract Subscription Terms Check Product Fit

Discovery and integrations