emerging · 1.7 marketcapability domainschema

x402

Score 22.2 / 100 17 providers 34 APIs Search apis.io →
Variants seen in the corpus: X402x402

Providers using this tag (17)

Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.

Exemplar 1 Complete, well-documented, and agent-ready
DrippayDrippay, Inc. is a Y Combinator company (YC P26) that operates two connected products. dreach — renamed fro...23 APIs77.3
Strong 3 Solid coverage with minor gaps
BuiltWithTechnology profiling and lead generation platform with a REST API for detecting technologies used by websit...31 APIs59.6HyperbrowserHyperbrowser provides cloud browser infrastructure tailored for AI agents, bundling managed Chromium sessio...12 APIs55.7ByKaranteliA crypto-derivatives market-structure data service built on a deterministic crypto-futures signal engine. I...2 APIs55.4
Developing 6 Usable, with meaningful gaps to close
Merit SystemsMerit Systems builds the infrastructure for open agentic commerce — the discovery and payment rails that le...6 APIs53.7OrthogonalOrthogonal is a unified API and payment layer for AI agents, backed by Pantera Capital and Y Combinator. An...4 APIs52.1SpongeSponge builds financial infrastructure for the agent economy — wallets that let AI agents hold and spend mo...10 APIs52.0FigmentFigment is an institutional staking infrastructure provider that runs validators and staking services acros...25 APIs50.9ExponentialExponential.fi is a DeFi company (backed by Paradigm and Norwest Venture Partners) behind YO Protocol — a c...5 APIs43.0_done_done is an agent-native catalog of 26 single-purpose utility REST APIs — network and DNS lookups, domain i...27 APIs40.7
Thin 2 Limited public surface area
KiteKite (gokite.ai, formerly Zettablock) builds agentic payment infrastructure for the machine-to-machine econ...3 APIs34.3Serbia Company DataA single-purpose, pay-per-call REST API serving normalized Serbian company registry data and latest financi...2 APIs29.9
Emerging 5 Early or largely undocumented
Gleeful AIGleeful AI publishes Visibility, an AI-visibility and answer-engine-optimization audit API: it scores how v...17 APIs24.2MoleculeMolecule is decentralized-science (DeSci) infrastructure for recording, tokenizing, funding, and accelerati...1 API23.4Nous ResearchNous Research is an AI research and infrastructure company ("The AI Accelerator Company") known for the ope...2 APIs21.5ZeroclickZeroClick is the agent-first storefront and transaction layer that lets businesses sell directly to AI agen...20.6RedotpayRedotPay is a global stablecoin-based payment fintech that integrates blockchain solutions with traditional...1 API19.2

APIs with this tag (34)

Ranked by the provider's API Evangelist rating — the Kin Score is scored per provider, not per API, so every API of a provider shares its band. How the rating works →

Strong 4 Solid coverage with minor gaps
BuiltWith x402 Pay-per-Call APIAccountless pay-per-call access to BuiltWith intelligence over the x402 v2 payment protocol on Base mainnet...59.6Hyperbrowser Web APIStateless web utilities: fetch a single page, run a web search, or start a crawl. Includes `/x402` micropay...55.7Hyperbrowser X402 APIThe X402 API from Hyperbrowser — 2 operation(s) for x402.55.7ByKaranteli X402 APIPer-call priced history and depth endpoints, settled in USDC over the x402 protocol on Solana and Base main...55.4
Developing 29 Usable, with meaningful gaps to close
Orthogonal API MarketplaceThe resold catalog itself — 795 payable operations across 58 third-party provider families (scraping, enric...52.1Figment X402 APIThe x402 API from Figment — 5 operation(s) for x402.50.9_done CatalogSingle-page agent-native catalog of the 26 _done pay-per-call utility APIs. Publishes a real llms.txt, a ro...40.7ASN LookupLook up the network operator, country, and address block behind any IP address or ASN number. Given an inte...40.7BIMI CheckerChecks whether a website's email branding setup is correct so its logo shows up in inboxes. Checks one or m...40.7Bulk DMARC Record LookupCheck email security (DMARC) configuration for one or many domains in a single request. Give this tool a li...40.7Bulk QR Code GeneratorTurn a list of text, URLs, or any strings into QR code images instantly — one call, many codes. Send a list...40.7CORS Header CheckerSend a URL and origin, get back exactly which cross-origin permissions that server grants. Sends a real req...40.7Curl HTTP RequestMake a real HTTP request from the cloud and get back the status code, headers, and body instantly. Send an ...40.7Directory Submission LitePlaces an order to have a website submitted to twenty directories, returning a confirmation number to track...40.7DNS & WHOIS LookupLook up all 13 DNS record types plus full WHOIS registration data for up to 10 domains in one call. Send up...40.7Domain Age CheckerGive it a list of domains and get back registration date, expiration date, age, and time remaining — instan...40.7Domain Availability CheckerCheck whether 1–10 domain names have an active registration record using the official RDAP protocol. Give t...40.7ENS ResolverResolve an ENS name to an Ethereum address, or an address back to its ENS name. Look up an ENS name or an E...40.7Hacker News DataFetch Hacker News stories by category, or scan all stories/jobs/polls from a specific date, with optional n...40.7Hashing, HMAC & Checksum SuiteCompute cryptographic hashes, HMAC signatures, and checksums — and verify webhook signatures with constant-...40.7HTTP Header CheckerFetches any web address and returns its response headers, status code, and redirect path. Sends a request t...40.7HTTP Status Code CheckerCheck the live status of up to 10 URLs at once and detect redirects instantly. Give this API a list of up t...40.7JSON Validate, Repair, Convert, Query & DiffOne endpoint to validate, repair, format, query, diff, convert, and canonicalize JSON — the most common ope...40.7Leetspeak TranslatorConverts regular text into leetspeak or decodes leetspeak back into normal readable text. Takes a piece of ...40.7Mortgage & Loan Amortization CalculatorGet the exact monthly payment and full period-by-period breakdown for any fixed-rate loan — results an AI m...40.7OCR Text ExtractorExtract text from any image using Tesseract OCR. Send a picture, either as a public web address or as base6...40.7ScreenshotsCapture a screenshot of a fully rendered webpage, including JavaScript-heavy pages. Renders a webpage exact...40.7SEO Data ExtractorFetch a webpage and instantly extract all key SEO fields: title, meta tags, headings, canonical URL, and mo...40.7Shopify AI Rank CheckerCheck exactly where your Shopify product ranks when AI shopping assistants like ChatGPT and Gemini search f...40.7Sitemap URL ExtractorGive it a sitemap.xml link and get back every URL listed in it — including nested sub-sitemaps — with metad...40.7TCP Port ScannerSend a host and port range, get back a clean list of which ports are open and what services are running on ...40.7URL Uptime CheckerChecks whether a website or web address is currently reachable and reports how fast it responded. Pay-per-c...40.7US CPI Data & Inflation ReportReturns the latest, a specific month's, or a historical range of official US inflation (CPI) figures from B...40.7
Emerging 1 Early or largely undocumented
RedotPay Agentic Payments APIProduction RedotPay HTTP API surface behind the redotpay CLI and the redotpay-payment MCP server. Provides ...19.2

Score breakdown

Frequency
47.3
log-scaled weighted occurrences
Breadth
0.5
spread across providers
Quality lift
50.2
mean composite of providers using it
Cohesion
1.2
strength of nearest seed neighbor

Related tags

Stablecoins 6 co-occurrences AI Agents 8 co-occurrences Agents 6 co-occurrences MCP 9 co-occurrences Payments 7 co-occurrences Company 10 co-occurrences

Where this tag comes from

Api tag34
Provider tag15
Openapi tag3
Openapi op tag21