P0 Agent Economy Index

Use when you need callable agent services for a capability across protocols: x402 listings ranked by relevance weighted by 30-day paying wallets, plus hosted MCP servers from the Official MCP Registry (a capped subset, count in coverage; those naming x402, L402, MPP or pay-per-call first; that registry publishes no prices). L402 and MPP listings are not covered. ?q= required. $0.002 USDC per call.

Use when an agent needs the full x402 service dataset. Returns complete dataset export: every listed service with 30-day calls, unique payers, price, network (compact keys, legend included)

Use when an agent needs the top x402 services tagged 'onchain'. Returns Highest-demand x402 services tagged 'onchain': ranked by 30-day unique paying wallets, with calls, price, network and calls-per-payer for each. 165 providers and 235 paying wallets measured in this tag.

Use when an agent needs an x402 seller rank or dossier. Returns Seller dossier by hostname (?host=api.example.com): that seller's x402 routes with 30-day calls and paying wallets, price ladder, networks and market share; without ?host — the top sellers by paying wallets.

Use when an agent needs the top x402 services tagged 'security'. Returns Highest-demand x402 services tagged 'security': ranked by 30-day unique paying wallets, with calls, price, network and calls-per-payer for each. 132 providers and 213 paying wallets measured in this tag.

Use when an agent needs the top x402 services tagged 'web'. Returns Highest-demand x402 services tagged 'web': ranked by 30-day unique paying wallets, with calls, price, network and calls-per-payer for each. 183 providers and 463 paying wallets measured in this tag.

Use when an agent needs the top x402 services tagged 'weather'. Returns Highest-demand x402 services tagged 'weather': ranked by 30-day unique paying wallets, with calls, price, network and calls-per-payer for each. 133 providers and 232 paying wallets measured in this tag.

Use when an agent needs the top x402 services tagged 'trading'. Returns Highest-demand x402 services tagged 'trading': ranked by 30-day unique paying wallets, with calls, price, network and calls-per-payer for each. 160 providers and 311 paying wallets measured in this tag.

Use when an agent needs the top x402 services tagged 'price'. Returns Highest-demand x402 services tagged 'price': ranked by 30-day unique paying wallets, with calls, price, network and calls-per-payer for each. 88 providers and 235 paying wallets measured in this tag.

Use when an agent needs the top x402 services tagged 'ai'. Returns Highest-demand x402 services tagged 'ai': ranked by 30-day unique paying wallets, with calls, price, network and calls-per-payer for each. 194 providers and 541 paying wallets measured in this tag.

Use when an agent needs the top x402 services tagged 'onchain-deep'. Returns Deep view: top 100 x402 services tagged 'onchain': ranked by 30-day unique paying wallets, with calls, price, network and calls-per-payer for each. 170 providers and 245 paying wallets measured in this tag.

Use when an agent needs the top x402 services tagged 'crypto-deep'. Returns Deep view: top 100 x402 services tagged 'crypto': ranked by 30-day unique paying wallets, with calls, price, network and calls-per-payer for each. 860 providers and 2031 paying wallets measured in this tag.

Use when an agent needs the top x402 services tagged 'search'. Returns Highest-demand x402 services tagged 'search': ranked by 30-day unique paying wallets, with calls, price, network and calls-per-payer for each. 160 providers and 524 paying wallets measured in this tag.

Use when an agent needs the top x402 services tagged 'compliance'. Returns Highest-demand x402 services tagged 'compliance': ranked by 30-day unique paying wallets, with calls, price, network and calls-per-payer for each. 184 providers and 278 paying wallets measured in this tag.

Use when an agent needs the top x402 services tagged 'defi'. Returns Highest-demand x402 services tagged 'defi': ranked by 30-day unique paying wallets, with calls, price, network and calls-per-payer for each. 257 providers and 591 paying wallets measured in this tag.

Use when an agent needs search x402 services by capability. Returns ranked service search by capability: up to 50 services with 30-day calls, unique payers and price, plus a receipt

Use for a short euro exchange rate history: daily ECB euro foreign exchange reference rates of one currency against EUR for up to the last 30 days (ccy=USD, days=1..30), with min, max and percent change over the window and a stale flag. Source attribution in every reply. Reference rates for information only, not transaction rates. $0.002 USDC per call. Or pay directly in BTC, ETH, USDT, SOL, TRX o

Use when an agent needs the top x402 services tagged 'onchain-data'. Returns Retired route /in-onchain-data: now serves the live /in-data ranking, the top 25 x402 services tagged 'data' by 30-day unique paying wallets.

Use when an agent needs the top x402 services tagged 'prices'. Returns Retired route /in-prices: now serves the live /in-x402 ranking, the top 25 x402 services tagged 'x402' by 30-day unique paying wallets.

Use when an agent needs the top x402 services tagged 'finance'. Returns Highest-demand x402 services tagged 'finance': ranked by 30-day unique paying wallets, with calls, price, network and calls-per-payer for each.

Use when an agent needs the top x402 services by paying wallets. Returns reference list of x402 sellers: ranked by unique sending wallets to the seller's wallet where P0 has counted them on-chain (one row per wallet), otherwise strongest evidence first, cheaper first among equals; free (amount 0) entries are not listed. checkedAt per row; stale >34 h, not returned >74 h.

Use when an agent needs x402 capability tags with demand. Returns tag vocabulary: every P0 tag with its provider count, resource count, unique sending wallets (where measured) and median price

Use when an agent needs demand stats for one x402 service. Returns one seller resource by URL or name: price, networks, tags, evidence and which source lists it (P0's own reads of seller 402 answers plus Agenstry-verified, Open 402 (MIT) and pay.sh (MIT) listings). An unknown URL is refused (404) before an x402 payment is taken. Demand: settled transfers and unique sending wallets to the seller's

Use for debugging an x402 client: pay $0.001 in USDC (or USDT0 on Arbitrum) on any network in accepts and get back what the server received: the decoded payment payload (scheme, network, authorization fields, signature), checks of amount, payTo, asset and validity window against this route's requirement, and the facilitator's settlement result. Only the payment header is echoed, never other header

Use when an agent needs x402 market totals. Returns market size: sellers listed by source and evidence (how many P0 has read itself), plus 30-day market totals from x402stats (CC BY 4.0), with attribution and a receipt

Use when an agent needs x402 demand by chain. Returns chain breakdown of the seller set: sellers and median declared price per network (P0's own reads of seller 402 answers plus Agenstry-verified, Open 402 (MIT) and pay.sh (MIT) listings); settled transfers and sending wallets per network where P0 measures them

Use when an agent needs to know how it is seen from outside: its public IP plus the country, region, city, ASN, AS organization, Cloudflare colo and TLS/HTTP version recorded by Cloudflare's edge for this connection. No external lookup. $0.001 per call (USDC or USDT). Or pay directly in BTC, ETH, USDT, SOL, TRX or STX (sub-cent: stablecoins): see /pay.

Use when an agent needs an x402 market report. Returns x402 market report on P0's own tags: categories by providers, resources, unique sending wallets and median price, and the top seller wallets by settled transfers. Demand comes from P0's own on-chain count to the sellers' wallets (wallet-level, not per resource)

Use when you need a wallet's token balances on several chains in one call: native coin plus USDC, USDT, DAI, WETH, WBTC/cbBTC on Ethereum, Base, Arbitrum and Polygon. Pass address (0x or an ENS name like vitalik.eth, resolved on Ethereum) and optional chains. Exact on-chain amounts with block numbers; a chain that fails is listed in errors, never shown as zero. No USD prices. $0.003 per call (USDC