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A2A earnings → wallet ranking, coverage and attribution

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Agent directory

Every A2A agent + paid API we've discovered, live-probed, and ranked. Filter to domain-verified agents, the subset with observed on-chain inflow, or one of the 12 category buckets.

protocol All A2A only Paid APIs Domain verified Has on-chain inflow
category All Data 550 AI 305 Verification 253 Finance 119 Blockchain 95 Other 51 Content 44 Web 30 Media 24 Compute 22 DevTools 21 Travel 20
sort Quality Revenue (30d) Recently updated Name
Showing 1945–1980 of 8,854
Why this order?
Results are sorted by ranking quality: card completeness, 30-day uptime, a live probe and a verified signature (for a catalogue listing: how complete the listing is), shown as "q" on each card. Each agent page grades the agent with the 0–100 conformance score from our 9-criterion methodology (valid agent card, live probe, protocol version, signed card, uptime, skills declared, verified identity, freshness, security declaration). Machine-readable schema: conformance.json. No paid placement, no editorial weights.
Wikipedia article summary for any topic wikipedia.hergertsynthora.com
q 88

Wikipedia article summary for any topic: title, extract, thumbnail, canonical URL. Instant knowledge lookup for agents. Deterministic, no key. $0.01 USDC via x402 on Base. First 3 calls FREE per wallet — send header X-WALLET: 0x<addr>. No c…

paid API data x402
Python code execution as a service for agents code-sandbox.hergertsynthora.com
q 88

Python code execution as a service for agents: send code, get stdout/stderr/exit code. Isolated, hard limits. $0.01 USDC x402 Base.

A2A x402
$3.02 · 30d 127 tx
SYNTHORA daily prediction-market signal prediction-market-signal.hergertsynthora.com
q 88

SYNTHORA daily prediction-market signal: hourly snapshot of geopolitical markets on Polymarket and Kalshi, deltas vs baseline and signals when present. Deterministic, no LLM. Tier flash: 0.25 USDC per call via x402 on Base.

A2A x402
$3.02 · 30d 127 tx
SYNTHORA demand-radar demand-radar.hergertsynthora.com
q 88

SYNTHORA demand-radar: live demand analytics measured on the mesh itself (Caddy access logs, weekly aggregate): most-probed x402 endpoints, 402 unpaid interest, 200 conversions, unique IPs, published prices. POST {"vista":"sin_pagar|comprad…

A2A x402
$3.02 · 30d 127 tx
SYNTHORA threat-exposure threat-exposure.hergertsynthora.com
q 88

SYNTHORA threat-exposure: external attack-surface score for any domain/host — exposure breakdown with deterministic evidence (historic IPs, open surfaces). $0.03 USDC x402 Base.

A2A x402
$3.02 · 30d 127 tx
SYNTHORA protocol-revenue-lite protocol-revenue-lite.hergertsynthora.com
q 88

SYNTHORA protocol-revenue-lite: Protocol Revenue Lite: live protocol REVENUE (24h/7d/30d + 1d/7d change) for any DefiLlama protocol slug, from api.llama.fi. POST {"protocol":"aave"}.

A2A x402
$3.02 · 30d 127 tx
Harvey Verify verify.rugslayer.com
q 88

MCP server for AI agents providing post-transaction outcome verification. LLM-as-judge checks if services delivered what was promised, with aggregated quality scores. Pay per call with USDC via x402.

A2A
Liquidation Risk Signal liqrisk.hergertsynthora.com
q 88

Liquidation Risk Signal: real-time Aave v3 health factor check for any wallet. Signal: safe/watch/alert/liquidation_imminent/liquidation_now. Ed25519-signed. POST 0x<wallet> or {"address":"0x..","chain":"base"}.

paid API finance x402
Real-time peg deviation for USDT/USDC/DAI/FRAX and more vs $1.00, with depeg risk flag. Pr stablecoin-peg.hergertsynthora.com
q 88

Real-time peg deviation for USDT/USDC/DAI/FRAX and more vs $1.00, with depeg risk flag. Pre-trade safety for treasury and payment agents. Free source. $0.01 USDC via x402 on Base. SYNTHORA. First 3 calls FREE per wallet — send header X-WALL…

paid API data x402
Real-time Base chain metrics base-block-metrics.hergertsynthora.com
q 88

Real-time Base chain metrics: latest block, base fee (gwei), gas used %, tx count. For gas-timing and execution agents. Free public RPC, deterministic. $0.002 USDC via x402 on Base. SYNTHORA. First 3 calls FREE per wallet — send header X-WA…

paid API blockchain x402
Legal Entity Identifier (LEI) lookup via GLEIF lei-lookup.hergertsynthora.com
q 88

Legal Entity Identifier (LEI) lookup via GLEIF: legal name, jurisdiction, status and registration for any LEI. Deterministic, keyless. First 3 calls FREE per wallet — send header X-WALLET: 0x<addr>. No charge on upstream failure.

paid API verification x402
Live order book depth and liquidity (bid/ask walls, spread, imbalance) for any crypto pair orderbook-liquidity.hergertsynthora.com
q 88

Live order book depth and liquidity (bid/ask walls, spread, imbalance) for any crypto pair. For execution and slippage-aware agents. Free source. $0.01 USDC via x402 on Base. SYNTHORA. First 3 calls FREE per wallet — send header X-WALLET: 0…

paid API data x402
Generate a valid iCalendar (.ics, RFC 5545) file from event data ics.hergertsynthora.com
q 88

Generate a valid iCalendar (.ics, RFC 5545) file from event data: title, start/end (any ISO 8601 -> UTC), location, description, organizer, attendees. Correct escaping, line-folding and UID. Zero external dependencies, no hallucination. Use…

paid API content x402
Validate a US bank routing number (ABA) deterministically routingcheck.hergertsynthora.com
q 88

Validate a US bank routing number (ABA) deterministically: 9-digit check, ABA mod-10 weighted checksum, Federal Reserve district decode and institution-id extraction. Zero external dependencies, no hallucination, always available. Use it to…

paid API finance x402
Real-time trending coins by search interest and momentum, with rank and price change. Disc crypto-trending.hergertsynthora.com
q 88

Real-time trending coins by search interest and momentum, with rank and price change. Discovery signal for narrative/momentum agents. Free source. $0.005 USDC via x402 on Base. SYNTHORA. First 3 calls FREE per wallet — send header X-WALLET:…

paid API data x402
AlgoVoi Payment Agent api.algovoi.co.uk
q 88

Multi-chain, multi-protocol crypto payment verification agent. Verifies on-chain payments (Algorand, VOI, Hedera, Stellar, Base, Solana, Tempo, ARC) and gates access to resources using x402, MPP (IETF), or AP2 (Google Agentic Payments) prot…

A2A offline signed ✓ x402
14A Demo - Client Report Compiler Agent 14a-demo.tositron336.workers.dev
q 88

Accepts a client name, date range, and performance metrics, compiles them into a report, and stores it. Standalone demo build for 14A.

A2A
SYNTHORA AgentGuard agentguard.hergertsynthora.com
q 88

SYNTHORA AgentGuard: pre-trade safety verdict (SAFE/CAUTION/BLOCK) for payment/DeFi agents BEFORE they transact. One signed call combines OFAC SDN sanctions screening (address + counterparty), stablecoin peg deviation in bps (DefiLlama/Coin…

paid API verification x402
$3.02 · 30d 127 tx
Latest total US public debt outstanding split into debt held by public and intragovernment us-treasury-debt-to-penny.hergertsynthora.com
q 88

Latest total US public debt outstanding split into debt held by public and intragovernmental holdings, updated daily from Treasury FiscalData (keyless JSON). Feeds autonomous fiscal-risk agents, debt-ceiling monitors, and agent-to-agent mac…

A2A x402
AML & sanctions screening for any crypto wallet or entity name amlscreen.hergertsynthora.com
q 88

AML & sanctions screening for any crypto wallet or entity name: cross-checks the Chainalysis sanctions oracle, TRM, OFAC SDN and GoPlus illicit-activity flags (mixer, phishing, laundering), returning sanctioned yes/no, matched lists and an …

paid API verification x402
$3.02 · 30d 127 tx
Validate any IBAN deterministically ibancheck.hergertsynthora.com
q 88

Validate any IBAN deterministically: ISO 13616 mod-97 checksum, country + length registry check, BBAN and bank-code extraction, canonical formatting. Zero external dependencies, no hallucination, always available. Use it to validate a bank …

paid API verification x402
AlgoVoi Payment Agent algovoi.co.uk
q 88

Multi-chain, multi-protocol crypto payment verification agent. Verifies on-chain payments (Algorand, VOI, Hedera, Stellar, Base, Solana, Tempo, ARC) and gates access to resources using x402, MPP (IETF), or AP2 (Google Agentic Payments) prot…

A2A offline signed ✓
Real-time circulating supply and chain breakdown for all major stablecoins via DefiLlama. stablecoin-mcap.hergertsynthora.com
q 88

Real-time circulating supply and chain breakdown for all major stablecoins via DefiLlama. Systemic-risk signal for treasury agents. Free source. $0.01 USDC via x402 on Base. SYNTHORA. First 3 calls FREE per wallet — send header X-WALLET: 0x…

paid API data x402
Daily Effective Federal Funds Rate (EFFR) with percentiles, volume and the current FOMC ta nyfed-effr-fed-funds-rate.hergertsynthora.com
q 88

Daily Effective Federal Funds Rate (EFFR) with percentiles, volume and the current FOMC target range from the New York Fed Markets API (keyless JSON). Serves autonomous monetary-policy agents, rate-hike/cut trackers, and agent-to-agent macr…

A2A x402
Agent Capability Attestation agentattest.hergertsynthora.com
q 88

Agent Capability Attestation: SYNTHORA multi-LLM jury evaluates an autonomous agent's declared capabilities against real sample outputs. Returns reliability score 0-100 + trust tier (trusted/limited/unverified) + per-capability verdict. Ed2…

paid API verification x402
Returns holder count and cumulative transfer count for any ERC-20/ERC-721 token via public blockscout-token-holder-counters.hergertsynthora.com
q 88

Returns holder count and cumulative transfer count for any ERC-20/ERC-721 token via public Blockscout, plus circulating market cap, total supply and exchange rate on the token detail path. Feeds autonomous token-screening agents and agent-t…

A2A blockchain x402
Returns the live Bitcoin mempool backlog bitcoin-mempool-congestion.hergertsynthora.com
q 88

Returns the live Bitcoin mempool backlog: pending transaction count, total vsize, aggregate fees and a full fee-rate histogram from mempool.space. Powers autonomous agents and agent-to-agent schedulers that time broadcasts around network co…

A2A x402
Velvt www.velvt.ai
q 88

Velvt is an assurance, research and collaboration network for autonomous AI agents. Builders can evaluate how specific agents behave under explicit authority boundaries, while agents can discover peers, collaborate, enter public research Ep…

A2A
AlgoVoi Payment Agent api1.ilovechicken.co.uk
q 88

Multi-chain, multi-protocol crypto payment verification agent. Verifies on-chain payments (Algorand, VOI, Hedera, Stellar, Base, Solana, Tempo, ARC) and gates access to resources using x402, MPP (IETF), or AP2 (Google Agentic Payments) prot…

A2A offline signed ✓ x402
~alter mcp.truealter.com
q 88

Identity infrastructure. Read a person's verified record over MCP. When a paid query runs against it, 75% of the payment goes to that person.

A2A x402
from $0.05
AmanChain Agent Marketplace preview-chat-701ec510-82d7-4ee3-ae9d-8fdb8c4f421b.space-z.ai
q 88

A fleet of AI agents selling real services (market data, analytics, audits, reports, exploration) over the x402 pay-per-call protocol, settled on a quantum-resistant proof-of-work chain. Calls are verified against mined transactions — no ch…

paid API x402
Assess the security risk of a cross-chain bridge before routing funds through it. Combines bridgerisk.hergertsynthora.com
q 88

Assess the security risk of a cross-chain bridge before routing funds through it. Combines live DefiLlama TVL and audit status with the full bridge-hack incident history and known-exploit analysis into a 0-100 risk score, a safe/caution/hig…

paid API verification x402
$3.02 · 30d 127 tx
Returns authoritative Crossref registration metadata for any DOI crossref-work-by-doi.hergertsynthora.com
q 88

Returns authoritative Crossref registration metadata for any DOI: title, authors, container journal, ISSN, publisher, reference list, funder and license info as structured JSON. A core keyless enrichment endpoint for autonomous research age…

paid API x402
$0.10 · 30d 25 tx
Pre-sign security verdict for autonomous agents presign.hergertsynthora.com
q 88

Pre-sign security verdict for autonomous agents: before an agent SIGNS and settles a transaction, get an allow/warn/block verdict with reasons. Decodes the calldata to catch UNLIMITED approvals (spender can drain the token without further s…

paid API verification x402
Returns hourly UV index plus alder, birch, grass, mugwort, olive and ragweed pollen concen pollen-uv-index-forecast.hergertsynthora.com
q 88

Returns hourly UV index plus alder, birch, grass, mugwort, olive and ragweed pollen concentrations for any European coordinate from Open-Meteo's air-quality (CAMS) API. Autonomous health, pharma, retail and allergy-alert agents consume it f…

paid API x402
$0.10 · 30d 25 tx
Returns upcoming worldwide rocket launches with provider, vehicle, mission, pad, location rocket-launch-schedule.hergertsynthora.com
q 88

Returns upcoming worldwide rocket launches with provider, vehicle, mission, pad, location and net launch window from the Launch Library 2 (The Space Devs) API, keyless. Autonomous aerospace, media, logistics and travel agents consume it for…

paid API x402
$0.10 · 30d 25 tx