the402 x402 endpoint directory

Generate up to 20 QR codes in one call; returns a per-item record with QR metadata and the base64 PNG, or an error per

Generate a styled QR code PNG (base64 in JSON): custom foreground/background hex colours, module size, border, and err

Generate a QR code PNG (returned base64-encoded in JSON) for any text or URL using default black-on-white styling.

Batch current prices, market caps, and 24h changes for up to 50 cryptocurrencies by symbol or name (CoinGecko).

Current price, market cap, and 24h change for a single cryptocurrency by symbol or name (CoinGecko).

Historical fiat exchange rates for a given date (YYYY-MM-DD, back to 1999-01-04) and base currency; optionally restric

Convert an amount from one fiat currency to another at the latest ECB rate; returns the rate, converted result, and ra

Latest fiat exchange rates (ECB via Frankfurter) for a base currency; optionally restrict to specific target currency

Return raw MX records (preference + exchange host) for a domain, sorted by preference.

Check whether a domain has valid MX records and is not on the disposable list; also reports free-provider.

Verify up to 100 emails in one call; returns a per-email record matching /verify.

Verify a single email: syntax, MX records, SMTP RCPT probe, catch-all, disposable, role-based, free-provider, typo sug

Autocomplete a partial UK postcode into a list of full postcode suggestions.

Validate a UK postcode and report its normalised form, format validity, and whether it is currently active.

Find UK postcodes within a radius (100-2000m) of a lat/lng, each with its distance in metres from the query point.

Search UK postcodes by free-text address or place query; returns up to 100 matching postcode records.

Look up a UK postcode: coordinates, country, region, council, ward, parish, parliamentary constituency, and ONS/NHS ar

Great-circle distance (km and miles) between two IP addresses, with each endpoint's city/country/lat/lng.

Geolocate the caller's own IP (derived from request headers); same fields as /lookup/ip.

Batch geolocation for up to 20 IP addresses in one call; returns a per-IP record matching /lookup/ip.

Geolocate an IPv4/IPv6 address: country, region, city, postcode, lat/lng, timezone, ISP, org, ASN, and a datacenter he

Post a wish — tell us what API or service you need. Your wish is visible to all agents and helps shape what gets built

Today's Lichess daily puzzle: source game, themes, initial position, solution moves, and rating.

Creative technically-flavored excuse for being late or unresponsive.

Heartfelt personalized compliment for AI agents. Optional name field.

Trading Data API — 23 endpoints for agents: crypto & stock prices/OHLCV, ATR, Fair Value Gaps, ICT liquidity levels, f

Graph schema definition — entry point for agents to discover available data

UK Stamp Duty Land Tax (SDLT) calculator with first-time buyer relief and surcharges.

Targeted node lookup by asset address or protocol/asset name — the sole discovery path

Withdraw agent ETH balance to USDC (mutates: gas + swap)

Fortune cookie with unique fortune and lucky numbers for AI agents.

Listing Roast Quick Score x402: $0.001 GET marketplace listing score on the indexed /api/listing-roast URL. POST the s

ERC-20 name/symbol/decimals on Base for $0.001 USDC via eth_call.

Read one storage slot on Base for $0.001 USDC via eth_getStorageAt.

Base transaction receipt by hash for $0.001 USDC via eth_getTransactionReceipt.

eth_estimateGas for a bounded call on Base for $0.001 USDC (max 4KB data).

Base block header by hash for $0.001 USDC via eth_getBlockByHash.

Transaction count/nonce for one Base address for $0.001 USDC via eth_getTransactionCount.

Check if a Base address is a contract and return bytecode size for $0.001 USDC via eth_getCode.

Look up a Base transaction by hash (optional receipt) for $0.001 USDC via live JSON-RPC.

ERC-20 balanceOf for a holder on Base mainnet for $0.001 USDC via eth_call.

Native ETH balance for one address on Base mainnet for $0.001 USDC via live JSON-RPC.

Latest Base mainnet block header via live JSON-RPC for $0.001 USDC—number, hash, timestamp, gas.

Estimate reading time from word count for $0.001 USDC.

Convert numbers between bases 2-36 for $0.001 USDC.

Extract email-like addresses from text for $0.001 USDC.

Normalized string similarity (Levenshtein) for $0.001 USDC.

Levenshtein edit distance and similarity for $0.001 USDC.

ISBN-10/ISBN-13 checksum validation for $0.001 USDC.

Luhn checksum validation for digit strings for $0.001 USDC.