x402.freeq.one
Base üzerinde Coinbase CDP x402 kolaylaştırıcısı aracılığıyla araçlar. Aracılar istek başına USDC ile ödeme yapar — saniyeler içinde zincir üzerinde ödenir. Sağlanacak API anahtarı yok, yönetilecek abonelik yok.
Dokümantasyon
**43 pay-per-call APIs for AI agents — blockchain data, web scraping, document/PDF-to-Markdown conversion, ZK proof verification, image & 3D model generation, QR/diagram/OG-image rendering, LLM chat, gift cards, short links, ephemeral webhook receivers. Settled in USDC on Base via the x402 payment protocol.** No accounts, no API keys: agents pay per request via the x402 protocol.
Pay-per-call MCP.No accounts. No logins. No keys.
43 tools on Base via the Coinbase CDP x402 facilitator. Agents pay per request in USDC — settled on-chain in seconds. No API keys to provision, no subscriptions to manage.
How it works
The x402 protocol turns HTTP 402 Payment Required into an onchain payment flow.
1
Agent reads metadata
GET the endpoint. Receive an OpenAPI spec + x402 payment details (payTo, amount, asset, network).
2
Sees 402 response
Server returns HTTP 402 with a signed payment requirement in USDC on Base or Solana.
3
Signs & pays onchain
Agent wallet broadcasts a USDC microtransaction on Base. No human needed, no account to create.
4
Gets the result
Server verifies the payment header and returns the API response. Done.
All APIs
Each tool is a standalone paid endpoint. Browse the catalog — click any card for details.
[
markdown $0.002
Fetch a URL and convert its main content to clean, LLM-ready Markdown. Strips nav/ads/sidebars.
POST Details →
](https://x402.freeq.one/tools/markdown.html)[
token_price $0.002
Get the live USD price of any token by symbol (e.g. BTC, ETH, SOL, PEPE).
GET Details →
](https://x402.freeq.one/tools/token_price.html)[
wallet_portfolio $0.002
Get a complete wallet portfolio: native ETH balance, ERC-20 balances, NFT holdings, recent transfers.
POST Details →
](https://x402.freeq.one/tools/wallet_portfolio.html)[
whale_alerts $0.002
Scan recent blocks for large ETH transfers involving an address. Filter by direction and threshold.
POST Details →
](https://x402.freeq.one/tools/whale_alerts.html)[
cross_chain_balance $0.002
Aggregate native balance and token/NFT counts for an address across eth, arb, base, polygon, opt.
POST Details →
](https://x402.freeq.one/tools/cross_chain_balance.html)[
changelog_openapi $0.005
Diff two OpenAPI specs and generate a structured breaking-change changelog. Deterministic, no LLM.
POST Details →
](https://x402.freeq.one/tools/changelog_openapi.html)[
changelog_git $0.005
Diff git commits and generate a structured breaking-change changelog. Provide repo URL + base commit.
POST Details →
](https://x402.freeq.one/tools/changelog_git.html)[
mermaid $0.005
Render a Mermaid diagram to an image (PNG or SVG). Returns base64-encoded image.
POST Details →
](https://x402.freeq.one/tools/mermaid.html)[
html_to_markdown $0.002
Convert an HTML string to clean, LLM-ready Markdown. Handles headings, links, tables, code blocks.
POST Details →
](https://x402.freeq.one/tools/html_to_markdown.html)[
qr_generator $0.002
Generate a QR code or barcode as an image (SVG or PNG). QR, Code128, EAN, UPC, ISBN, and more.
GET Details →
](https://x402.freeq.one/tools/qr_generator.html)[
og_image_generator $0.002
Generate an Open Graph social-card image (1200x630 PNG) from a title and description.
GET Details →
](https://x402.freeq.one/tools/og_image_generator.html)[
jobs $0.002
Search live job postings by keywords and locations. Returns structured results: title, company, location, salary, and more.
POST Details →
](https://x402.freeq.one/tools/jobs.html)[
verify_semaphore $0.002
Verify a Semaphore ZK proof locally using Groth16 (embedded official vkey). No external dependency — pure on-device verification.
POST Details →
](https://x402.freeq.one/tools/verify_semaphore.html)[
verify_worldid $0.005
Verify a World ID 4.0 proof via the Worldcoin Developer Portal API. Generates RP signature, proxies to Worldcoin, returns nullifier + validity.
POST Details →
](https://x402.freeq.one/tools/verify_worldid.html)[
verify_batch $0.005
Batch verify up to 10 Semaphore proofs in a single request. Returns per-proof results with timing stats.
POST Details →
](https://x402.freeq.one/tools/verify_batch.html)[
wallet_verify_siwe $0.002
Verify a Sign-In-With-Ethereum (EIP-4361) signature as a paid oracle: returns wallet address + chainId, mints nothing.
POST Details →
](https://x402.freeq.one/tools/wallet_verify_siwe.html)[
wallet_verify_nostr $0.002
Verify a NIP-98 Nostr HTTP auth event with replay protection (each event id verifies once). Returns the signer pubkey.
POST Details →
](https://x402.freeq.one/tools/wallet_verify_nostr.html)[
wallet_verify_solana $0.002
Verify an ed25519 Solana wallet signature over a nonce-bearing message. One verification per nonce; returns signer pubkey.
POST Details →
](https://x402.freeq.one/tools/wallet_verify_solana.html)[
wallet_checksum $0.002
Convert an Ethereum address to its EIP-55 checksummed form — required on SIWE message line 2 before signing.
POST Details →
](https://x402.freeq.one/tools/wallet_checksum.html)[
llm_chat $0.002
Chat with a language model. OpenAI-compatible /v1/chat/completions. 50+ models — free (auto, eco, premium) are $0, paid models at cost.
POST Details →
](https://x402.freeq.one/tools/llm_chat.html)[
pdf_to_markdown $0.01
Convert a PDF document to clean, LLM-ready Markdown. Direct URL or base64 file bytes. Reports, papers and contracts become RAG-ready text.
POST Details →
](https://x402.freeq.one/tools/pdf_to_markdown.html)[
docx_to_markdown $0.005
Convert a DOCX (Word) document to Markdown. Contracts, resumes, reports and letters — headings, lists and tables preserved.
POST Details →
](https://x402.freeq.one/tools/docx_to_markdown.html)[
pptx_to_markdown $0.005
Convert a PPTX (PowerPoint) presentation to Markdown. Each slide becomes a heading — pitch decks turn into LLM-readable text.
POST Details →
](https://x402.freeq.one/tools/pptx_to_markdown.html)[
xlsx_to_markdown $0.005
Convert XLSX or CSV to a Markdown table AND a JSON array of row objects in one call. All sheets included, flattened in order.
POST Details →
](https://x402.freeq.one/tools/xlsx_to_markdown.html)[
epub_to_markdown $0.005
Convert an EPUB e-book to Markdown. Chapters become headings; metadata included — feed whole books into LLM context.
POST Details →
](https://x402.freeq.one/tools/epub_to_markdown.html)[
document_to_markdown $0.01
Convert any document to Markdown with automatic format detection — pdf, docx, pptx, xlsx, csv, epub, html, text. One endpoint for all of them.
POST Details →
](https://x402.freeq.one/tools/document_to_markdown.html)[
verify_stablecoin $0.005
Verify a stablecoin: issuer identity, GENIUS Act qualification status, and latest reserve attestation. Resolves the token from chain+address, a known symbol, or a tx hash. Free preview validates the input and returns the issuer only.
POST Details →
](https://x402.freeq.one/tools/verify_stablecoin.html)[
giftcard_buy dynamic
Buy a digital gift card code (Foot Locker, Target, AMC, 1000+ brands). Search the catalog free, pay the face value + fee in USDC — code delivered instantly, settled on Base via x402.
POST Details →
](https://x402.freeq.one/tools/giftcard_buy.html)[
shortlink_create $0.002
Create a permanent short link on freeq.one (custom or random slug, optional TTL expiry). Returns the short URL plus a one-time manage_secret that gates free stats and deletion of the link.
POST Details →
](https://x402.freeq.one/tools/shortlink_create.html)[
shortlink_stats $0.001
Click stats for a freeq.one short link: total clicks and last-30-day daily counts. Free for the link owner (pass the manage_secret); paid calls serve agent link-verification flows.
GET Details →
](https://x402.freeq.one/tools/shortlink_stats.html)[
webhook_catch $0.05
Ephemeral webhook receiver: creates a single-use HTTPS URL that catches any POST (Stripe, GitHub, internal) for up to an hour. Sender ingest is free; reads are $0.01, +1h extends are $0.05. In-memory, auto-deletes on expiry.
POST Details →
](https://x402.freeq.one/tools/webhook_catch.html)[
RaaS — Referral-as-a-Service: short-link referrals that turn verified on-chain x402 payments on Base into service credits. Provision a project with one paid x402 call to /tools/raas_project_provision ($0.05, one-time) and get back a project_id plus an API key; mint links at freeq.one/{code} and read stats with that key at no extra cost. Rewards are credits redeemable for API access, never USDC.
API Details →
](https://x402.freeq.one/tools/raas.html)[
google_serp $0.02
Live Google organic results for any keyword. Returns top 10 titles, URLs, snippets, and rank. Priced below typical SEO-data APIs.
POST Details →
](https://x402.freeq.one/tools/google_serp.html)[
keyword_volume $0.03
Google search volume, CPC, and competition for up to 100 keywords. Priced below typical SEO-data APIs.
POST Details →
](https://x402.freeq.one/tools/keyword_volume.html)[
keyword_ideas $0.05
Generate keyword ideas from a seed keyword with volume data. Priced below typical SEO-data APIs.
POST Details →
](https://x402.freeq.one/tools/keyword_ideas.html)[
domain_competitors $0.05
Find organic competitors for any domain. Priced below typical SEO-data APIs.
POST Details →
](https://x402.freeq.one/tools/domain_competitors.html)[
domain_keywords $0.05
Get all keywords a domain ranks for with position and volume. Priced below typical SEO-data APIs.
POST Details →
](https://x402.freeq.one/tools/domain_keywords.html)[
backlinks_overview $0.05
Backlink overview for any domain — referring domains, backlink count, authority. Priced below typical SEO-data APIs.
POST Details →
](https://x402.freeq.one/tools/backlinks_overview.html)[
search_intent $0.02
Detect search intent (informational, transactional, commercial) for a keyword. Priced below typical SEO-data APIs.
POST Details →
](https://x402.freeq.one/tools/search_intent.html)[
image_generate $0.02
Text-to-image generation (fast tier, 2-6s). Returns a permanent hosted image URL. Game assets, avatars, illustrations, concept art.
POST Details →
](https://x402.freeq.one/tools/image_generate.html)[
image_generate_quality $0.09
Premium text-to-image generation (10-30s) — better prompt adherence and typography. Returns a permanent hosted image URL.
POST Details →
](https://x402.freeq.one/tools/image_generate_quality.html)[
photo_to_3d_fast $0.15
Photo to 3D model (fast tier, 10-30s). Single 2D image URL to a textured low-poly GLB mesh + preview thumbnail. Game-ready — Three.js, Unity, Godot.
POST Details →
](https://x402.freeq.one/tools/photo_to_3d_fast.html)[
photo_to_3d_hq $0.50
Photo to 3D model (high-detail tier, 1-3 min). High-poly textured GLB with PBR-like shading + preview thumbnail. Game-ready — Three.js, Unity, Godot.
POST Details →