STAGINGThis is a preview of nitrograph.com. Actions here hit the production API.
Catalog

Every agent-payable API.

The companies you know, and thousands of endpoints your agent will discover. The catalog groups the network's 28,500+payable services under the companies that operate them — one company row can carry many service endpoints. Placement can't be bought.

All APIs

28,543 APIs
APICompanyCategoryPrice / callStatus
x402-gateway
x402-gateway tool: document_to_markdown (market: agoragentic)
freeq.one-$0.01listed
x402-gateway
x402-gateway tool: qr_generator (market: agoragentic)
freeq.one-$0.01listed
x402-gateway
x402-gateway tool: wallet_checksum (market: bazaar)
freeq.one-$0.002listed
x402-gateway
x402-gateway tool: html_to_markdown (market: bazaar)
freeq.one-$0.002listed
x402-gateway
x402-gateway tool: shortlink_stats (market: bazaar)
freeq.one-$0.001listed
x402-gateway
Ethereum Address Checksum: Convert an Ethereum address to its EIP-55 checksummed form. SIWE messages require the checksummed address on line 2 before signing. Pay per call in USDC on Base via x402 — POST https://x402.freeq.one/tools/wallet_checksum.
freeq.one-$0.002listed
x402-gateway
x402-gateway tool: jobs (market: bazaar)
freeq.one-$0.002listed
x402-gateway
x402-gateway tool: markdown (market: bazaar)
freeq.one-$0.001listed
x402-gateway
x402-gateway tool: wallet_verify_nostr (market: bazaar)
freeq.one-$0.002listed
x402-gateway
x402-gateway tool: og_image_generator (market: bazaar)
freeq.one-$0.002listed
x402-gateway
x402-gateway tool: shortlink_create (market: bazaar)
freeq.one-$0.002listed
x402-gateway
x402-gateway tool: wallet_verify_solana (market: bazaar)
freeq.one-$0.002listed
x402-gateway
SIWE Signature Verifier: Verify a Sign-In-With-Ethereum (EIP-4361) signature. Stateless oracle: checks the signature against the message and returns the wallet address + chainId. Never mints sessions or consumes nonces. Get a checksummed address first via wallet_checksum. Pay per call in USDC on Base via x402 — POST https://x402.freeq.one/tools/wallet_verify_siwe.
freeq.one-$0.002listed
x402-gateway
x402-gateway tool: cross_chain_balance (market: bazaar)
freeq.one-$0.002listed
x402-gateway
Semaphore ZK Proof Verifier: Verify a Semaphore ZK proof locally using Groth16 (embedded official vkey). No external dependency. Send the proof object from @semaphore-protocol/proof generateProof(). Pay per call in USDC on Base via x402 — POST https://x402.freeq.one/tools/verify_semaphore.
freeq.one-$0.002listed
x402-gateway
x402-gateway tool: token_price (market: bazaar)
freeq.one-$0.002listed
x402-gateway
Solana Signature Verifier: Verify an ed25519 Solana wallet signature over a message containing a 'Nonce: <value>' line. Returns the signer pubkey. Consumes the nonce — one verification per nonce. Pay per call in USDC on Base via x402 — POST https://x402.freeq.one/tools/wallet_verify_solana.
freeq.one-$0.002listed
x402-gateway
Short Link Creator: Create a permanent short link on freeq.one (e.g. https://freeq.one/MySlug). Optional: custom slug, expires_at (ISO date) for a TTL link that auto-expires — same price. Returns short_url plus a one-time manage_secret that gates FREE stats (GET /tools/shortlink_stats with X-Link-Secret) and FREE deletion of the link. Store the secret — it is shown only at creation. Pay per call in USDC on Base via x402 — POST https://x402.freeq.one/tools/shortlink_create.
freeq.one-$0.002listed
x402-gateway
x402-gateway tool: verify_semaphore (market: bazaar)
freeq.one-$0.002listed
x402-gateway
x402-gateway tool: wallet_portfolio (market: bazaar)
freeq.one-$0.002listed
x402-gateway
x402-gateway tool: wallet_verify_siwe (market: bazaar)
freeq.one-$0.002listed
x402-gateway
Short Link Stats: Click stats for a freeq.one short link: total clicks, last-30-day clicks, last click time. FREE for the link owner — pass the manage_secret returned at creation as the link_secret field. The paid call is for agents checking a link they did not create (liveness/traffic check). Pay per call in USDC on Base via x402 — POST https://x402.freeq.one/tools/shortlink_stats.
freeq.one-$0.001listed
x402-gateway
Page Screenshot: Full-browser screenshot of any public page as base64 PNG or JPEG: viewport or full-page, custom size, rendered in headless Chromium. Pay per call in USDC on Base via x402 — POST https://x402.freeq.one/tools/page_screenshot.
freeq.one-$0.002listed
x402-gateway
x402-gateway tool: whale_alerts (market: bazaar)
freeq.one-$0.002listed
x402-gateway
Paid ping — test the x402 payment flow end-to-end. Returns pong. Costs $0.001, exists so agents can verify their x402 wallet setup against this gateway cheaply.
x402-gateway.ai-$0.001listed
x402-gateway
NIP-98 Nostr Auth Verifier: Verify a NIP-98 Nostr HTTP auth event. Returns the signer pubkey. Stateful replay protection: each event id can only be verified once. Pay per call in USDC on Base via x402 — POST https://x402.freeq.one/tools/wallet_verify_nostr.
freeq.one-$0.002listed
x402-gateway
x402-gateway tool: qr_generator (market: bazaar)
freeq.one-$0.002listed
x402-gateway MCP call
x402-gateway MCP call
freeq.one-$0.001listed
x402-gateway tool: changelog_git
x402-gateway tool: changelog_git
freeq.one-$0.005listed
x402-gateway tool: changelog_openapi
x402-gateway tool: changelog_openapi
freeq.one-$0.005listed
x402-gateway tool: cross_chain_balance
x402-gateway tool: cross_chain_balance
freeq.one-$0.002listed
x402-gateway tool: html_to_markdown
x402-gateway tool: html_to_markdown
freeq.one-$0.001listed
x402-gateway tool: jobs
x402-gateway tool: jobs
freeq.one-$0.002listed
x402-gateway tool: markdown
x402-gateway tool: markdown
freeq.one-$0.001listed
x402-gateway tool: mermaid
x402-gateway tool: mermaid
freeq.one-$0.005listed
x402-gateway tool: og_image_generator
x402-gateway tool: og_image_generator
freeq.one-$0.001listed
x402-gateway tool: qr_generator
x402-gateway tool: qr_generator
freeq.one-$0.001listed
x402-gateway tool: token_price
x402-gateway tool: token_price
freeq.one-$0.002listed
x402-gateway tool: wallet_portfolio
x402-gateway tool: wallet_portfolio
freeq.one-$0.002listed
x402-gateway tool: whale_alerts
x402-gateway tool: whale_alerts
freeq.one-$0.002listed
x402-giftcard-api
Buy a gift card code at the listed price. Price is returned in the payment challenge before you sign.
freeq.one-$1.00listed
x402-listing-watch
Is your x402 service still listed? The Bazaar removes resources that go without settlement, and no one tells you. We keep a daily snapshot of the whole catalog since June, so we can show whether your domain is present today, how its resource count moved day by day, and how long since each resource was last paid for. In our latest scan 620 of 2,147 domains are no longer present. Measured from our own snapshots.
dailyelo.com-$0.01listed
x402-payment-test
Cheapest possible Base-mainnet x402 conformance call: settle exactly one atomic unit of USDC ($0.000001) and receive payer identity, request echo and receipt. Built for agents testing wallets, Payment-Signature, facilitators and settlement. Try GET /x402-echo/sample.
agentindex.world-$0.001listed
x402-paywall-probe
Probe any public URL and report if it is an x402 paywall - price, network, payTo, scheme. Shop paywalls before you spend. Try GET /probe/sample.
agentindex.world-$0.001listed
x402-sales-gap
Listed, able to charge, and still not selling? We join the Bazaar catalog with measured on-chain revenue and report the median profile of the top fifth of earners, of everyone earning anything, and of those earning nothing, alongside your own. In our data the top fifth list 14 resources to the zero group one, and write 190-character descriptions to their 370. Correlations across services, not advice. ?domain=.
dailyelo.com-$0.03listed
x402-scraper-api
URL + JSON schema to structured JSON
railway.app-$0.02listed
x402-scraper-api
Compares Polymarket market rules and bookmaker market description
railway.app-$0.05listed
x402-scraper-api
URL to clean markdown
railway.app-$0.005listed
x402Pulse
Bills in Congress linked to money: the companies that lobbied on each bill (with amounts) and trades by members of Congress in those companies' stocks, plus each bill's latest action and official link. Search by ticker, member or bill title/number. For research, not proof of motive.
x402pulse.dev-$0.0084listed
x402Pulse
Market-wide insider trading feed: the largest open-market insider purchases and sales filed across all U.S. stocks in the last days (or for one ticker), with insider, role, shares, price, value and cluster buys (3+ insiders buying the same stock). Data, not investment advice.
x402pulse.dev-$0.0056listed
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